By A. Brant. University of Minnesota-Duluth. 2019.
She would like to inquire about preventing further compression with vertebroplasty buy avalide 162.5 mg low price. Suggested Answer: Based on this randomized controlled trial and societal guidelines order avalide without prescription, vertebro- plasty is not recommended for painful osteoporotic compression fractures in patients who are neurologically intact cheap 162.5 mg avalide visa. Surgical intervention may be indicated in patients who develop neurological impairment (e generic avalide 162.5mg with mastercard. A randomized trial of vertebroplasty for painful osteoporotic vertebral fractures. T e treatment of symptomatic os- teoporotic spinal compression fractures: guideline and evidence report. Percutaneous vertebroplasty and percutaneous balloon kyphoplasty for treating osteoporotic vertebral com- pression fractures. Study Location: 21 emergency departments (academic and community) across the United States. Who Was Studied: Patients with blunt trauma who underwent cervical spine radiography (standard three views including cross-table lateral, anteroposte- rior, and open-mouth odontoid views). How Many Patients: 34,069 Study Overview: Prospective, multicenter, observational study. Study Intervention: Decision instrument involving 5 criteria in order to clas- sify a patient as having low probability of injury: no posterior midline cervi- cal spine tenderness, no focal neurological defcit, normal level of alertness, no evidence of intoxication, and no clinically apparent pain elsewhere that might distract from cervical spine pain. Follow- Up: Review of neurosurgical medical records and quality-assurance logs (but follow-up time period unspecifed). Endpoints: T e sensitivity, specifcity, negative predictive value, and positive predictive value of the decision instrument for predicting clinically signifcant cervical spine injury confrmed on radiography (Figure 10. T is study was strictly observational, and some pa- tients with cervical spine injury at study sites that met criteria but did not un- dergo radiography were not included in the study. Its widespread application could lead to both clinical and economic benefts by eliminating one-eighth of all cervical spine radiographs ordered for this patient population. T e patient denies any posterior midline cervical spine tenderness on exam- ination, and has no focal neurological defcit. He exhibits a normal level of alertness, no signs of intoxication, and no clinically apparent pain elsewhere. His parents would like to get a batery of tests to make sure that nothing has been injured. T us, the decision rule would apply in the case of this 13 year-old who meets all fve negative criteria. A standard three-view cervical spine radiograph examination therefore would not be of beneft in this case. You should reassure the parents that no imaging study is warranted and that the radiation and costs associated with cervical spine imaging would likely outweigh any potential beneft in this case. Validity of a set of clinical criteria to rule out injury to the cervical spine in patients with blunt trauma. Validity of a decision rule to reduce cer- vical spine radiography in elderly patients with blunt trauma. Funding: Medical Research council of canada, Ontario Ministry of Health Emergency Health Services commitee, and the canadian Institutes of Health Research. Year Study Began: 1996 Year Study Published: 2001 Study Location: 10 large canadian community and university hospitals. Patients were included if they had neck pain from any mechanism of injury, or no neck pain but all of the following: some visible injury above the clavicles, had not been ambulatory, and had sustained a dangerous mechanism of injury (fall from an elevation ≥1 m or 5 stairs, axial load to the head, high-speed motor vehicle collision, roll over, ejection, bicycle collision, motorized vehicle col- lision). Patients also had to be alert (Glasgow coma Scale [GcS] score of 15 out of 15) and stable (normal vital signs including systolic blood pressure > 90 mm Hg and respiratory rate between 10–24/minute). Who Was Excluded: Patients <16 years old; did not meet inclusion criteria above; injury occurred >48 hours previously; penetrating trauma; acute pa- ralysis; known vertebral disease (ankylosing spondylitis, rheumatoid arthri- tis, spinal stenosis, or previous cervical surgery); returned for reassessment of same injury; pregnant. How Many Patients: 8,924 Study Overview: Prospective cohort study to collect clinical fndings data; pa- tients underwent cervical spine radiography (minimum of 3 views) at the discre- tion of the treating physician afer the clinical assessment; logistic regression and chi-square recursive partitioning techniques to develop clinical decision rule. Study Intervention: Physician evaluation of 25 standardized clinical variables (from the history, physical examination, and medical records) prior to cervical spine radiography. Follow- Up: All enrolled patients who did not undergo cervical spine im- aging underwent 14-day follow-up telephone interview administered by a registered nurse. Endpoints: clinically important cervical spine injury was defned as any frac- ture, dislocation, or ligamentous instability demonstrated by diagnostic imag- ing or 14-day proxy outcome measure administered by nurse over the phone. Is there any low-risk factor present that allows safe assessment of range of motion (i. Is the patient able to actively rotate his/her neck 45 degrees to the lef and right? Not all study patients under- went cervical spine radiography (some had outcomes measured by a structured 14- day telephone- proxy outcome tool). It may also help to standardize the appropriate use of cervical spine imaging in the emergency department. She is alert (GcS score of 15 out of 15) with normal vital signs including a systolic blood pressure of 130 mm Hg and respiratory rate 16/minute. What further questions should you ask her during your history, and what will you examine physically in order to determine whether cervical spine imaging is required? Suggested Answer: Based on the canadian c-Spine Rule, the patient has already fulflled the frst major criteria (there are no obvious high-risk factors demanding immediate imaging). On further questioning, you should determine if there are any low- risk factors present that would allow you to safely assess her neck’s range of motion (i. If there is a low-risk factor present, then you may ask the patient to atempt to rotate her neck 45 degrees to the lef and right. Multicentre prospective validation of use of the canadian c-Spine Rule by triage nurses in the emergency department. Implementation of the canadian c-Spine Rule: prospective 12 centre cluster randomized trial. Prospective comparison of admission computed tomographic scan and plain flms of the upper cervical spine in trauma patients with altered mental status. W ho W as Excluded: Patients with lumbar surgery within the previous year, those with acute external trauma, and those with metallic implants in the spine. Study Intervention: Patients assigned to the plain radiograph group received the flms according to standard protocol. Most patients received anteroposte- rior and lateral views only, but a small number received additional views when requested by the ordering physician. Patients are given 1 point for each “yes” answer for a total possible score of 23. His symptoms began afer doing yard work and have improved only slightly during this time period. T e pain is bothersome, but not incapacitat- ing, and radiates down his right leg. He has no systemic symptoms (fevers, chills, or weight loss) and denies bowel or bladder dysfunction. For this reason, you should reassure your patient in other ways, for example by telling him that he does not have any signs or symptoms of a serious back problem like an infection or cancer. Other types of spinal imaging such as plain radiographs do not appear to improve outcomes in patients with acute low back pain without alarm symp- toms either. Rapid magnetic resonance imaging vs radiographs for patients with low back pain: a randomized controlled trial. A study of the natural history of back pain, 1: develop- ment of a reliable and sensitive measure of disability in low back pain. Funding: Hoag Memorial Hospital and the Harbor Radiology Research and Education Fund. Who Was Excluded: Patients with a history of back pain lasting >48 hours or any lumbrosacral radiculopathy. How Many Patients: 125 (98 asymptomatic, 27 symptomatic) Study Overview: Prospective cohort study. Two neuroradiologists interpreted the scans independently, blinded to clinical information. Endpoints: Intervertebral disk fndings were classifed into the following intervertebral disk categories: normal, bulge (circumferential symmetric extension of the disk beyond the interspace), protrusion (focal of symmetric extension of the disk beyond the interspace), and extrusion (more extreme ex- tension of the disk beyond the interspace). Findings were correlated with level of physical activity (0–4 scale, with 0 indicating no exercise and 4 indicating regular workouts). T e prevalence of disk bulges or protrusions did not vary based on physical activity score. The Trial’s Key Findings Evaluator and Subjects Bulge Protrusion Extrusion n (%) n (%) n (%) Evaluator 1 Asymptomatic subjects 52 (53) 30 (31) 2 (2) Symptomatic subjects 23 (85) 14 (52) 8 (30) Evaluator 2 Asymptomatic subjects 50 (51) 23 (23) 0 (0) Symptomatic subjects 18 (67) 15 (56) 6 (22) Average of two evaluators Asymptomatic subjects 51 (52) 26.
The sur- been less satisfactory avalide 162.5 mg lowest price, but more recently results seem to be gically implanted trial lead requires placement in the oper- improving with the advent of dual lead systems and elec- ating room and surgical removal if the trial is unsuccessful cheap 162.5mg avalide fast delivery. Level of Evidence Quality of Evidence and Grading of Recommendation Grade of Recommen- Beneﬁt vs order avalide with paypal. The American Pain Society Low Back Pain Guideline simpliﬁes the operation by obviating the need to turn from Panel published a report in 2009 buy avalide 162.5mg mastercard, concluding, “In patients the prone to lateral position halfway through implantation. The procedure must be conducted using recommended that shared decision-making regarding spinal local anesthesia and light enough sedation that the patient cord stimulation include a discussion about the high rate of can report where he or she feels the electrical stimulation complications following spinal cord stimulator placement. The American Society of Anesthesiologists Task Force on The patient is positioned on a radiolucent table in the prone Chronic Pain Management published a 2010 Practice Guide- position (see Fig. Initial lead placement can be carried line, offering the following recommendations: “Spinal cord out with the patient in a lateral decubitus position; how- stimulation may be used in the multimodal treatment of per- ever, even small degrees of rotation along the spinal axis can sistent radicular pain in patients who have not responded to make positioning of the lead difﬁcult. It may also be considered for other selected upward so they are in a position of comfort well away from patients (e. The skin is prepared, and sterile drapes are pain, peripheral vascular disease, or postherpetic neuralgia). For stimulation in the low back and lower extremi- Shared decision making regarding spinal cord stimulation ties, the radiographic C-arm is positioned directly over the should include a speciﬁc discussion of potential complica- thoracolumbar junction to provide an anteroposterior view tions associated with spinal cord stimulator placement. Care must be taken to ensure the x-ray view is spinal cord stimulation trial should be performed before con- not rotated by observing that the spinous processes are in the sidering permanent implantation of a stimulation device. The available evidence for long-term efﬁcacy is modest and the associated risks are low. The opinion from different consensus groups is consistent but epidural needle supplied by the device manufacturer highlights the empiric nature of patient selection. The needle is directed to Placement of a percutaneous trial spinal cord stimulator enter the spinal space in the midline, with an angle of lead can be carried out in any location that is suitable for entry no >45 degrees from the plane of the epidural space epidural catheter placement. If the angle of attack of the needle ating room, but it can easily and safely be carried out in on initial entry into the epidural space is too great, the any location that allows for adequate sterile preparation epidural lead will be difﬁcult to thread as it negotiates of the skin and draping of the operative ﬁeld and that has the steep angle between the needle and the plane of the ﬂuoroscopy available to guide anatomic placement. The shallower the angle of attack, that a strictly percutaneous trial, the trial lead is placed in the is, the closer that the plane of the needle shaft is to the same fashion used for permanent lead placement, but the plane of the posterior epidural space, the easier it will lead is secured to the skin without any incision for the trial be to thread the lead directly along the midline of the period. The elec- cuss with the patient the location of the pocket for the impulse trode is then advanced through the needle and is directed generator. The regions most suitable for placement are the to remain to one side of midline in the dorsal epidural lower quadrant of the abdomen or the lateral aspect of the space as it is threaded cephalad under ﬂuoroscopic guid- buttock. The electrode contains a wire incision with a permanent marker while the patient is in the stylette with a slight angulation at the tip; gentle rota- sitting position. The position of the pocket is deceptively dif- tion of the electrode as it is advanced allows the operator ﬁcult to determine once the patient is lying on his or her side. Placement of the impulse extremities, the electrode is initially positioned 2 to 3 mm generator within the buttock allows for the entire procedure from the midline on the same side as the patient’s pain to be carried out with the patient in the prone position and between the T8 and the T10 vertebral levels (Fig. View of typical operating room arrangement during spinal cord stimulator implantation. The patient is placed in the prone position with the C-arm in place for an anterior-posterior view of the thoracolumbar spine. The C-arm must be carefully aligned to ensure there is no rota- tion, with the spinous processes aligned in the midline, midway between the vertebral pedicles. The skin entry point for the epidural needle is placed just inferior to the inferior margin of the pedicle one full interspace below the interspace to be entered (typically L1/ L2 for lower extremity and/or low back stimulation with skin entry just inferior to the L3 pedicle). The entry point in this illustration is more lateral and superior than desirable, resulting in steeper than desired angle of needle entry. The needle should enter the inter- space well below the lamina of the vertebra bordering the superior aspect of the interspace and just to the left or right of midline on the side where you are attempting to advance the electrode. The area is then bathed with a small amount of local anesthetic to reduce discomfort, and the needle is “walked” over the lamina and into the interlaminar space. In general, cephalad advancement will result in stimulation higher in the extremity and caudad movement will lead to stimulation lower in the extremity. However, if the lead is angled even slightly from medial to lateral, the pattern of stimulation may change less predictably with movement of the electrode (e. The ﬁnal electrode position should be recorded using radiography so a permanent lead can be placed in the same position (see Fig. For trial stimula- tion, the needle is then removed, the electrode is secured to the back, and a sterile occlusive dressing is applied (Fig. The patient is instructed in the use of the external pulse generator and scheduled to return in 5 to 7 days for assessment of his or her response and removal of the trial lead. The electrode should be advanced the ability to provide adequate stimulation of the low just a few millimeters from the midline to the side where it is back. Three-dimensional reconstruction computed tomogra- phy of the lumbar spine as viewed in the lateral projection used for verifying lead position in the posterior epidural space. If the elec- trode deviates too far from midline during advancement, it can easily pass around the lateral aspect of the dural sac and course superiorly along the ventral aspect of the epi- dural space. Ventral electrode placement should be suspected if the patient reports torso stimulation at very low amplitude and can be easily conﬁrmed using lateral radiography. During permanent implantation, the procedure for initial lead placement is identical to that for trial stimulation. Once the ﬁnal lead position is attained and the optimal pattern of stimulation is conﬁrmed, the lead must be secured, a pocket for the impulse generator must be created, and the lead tun- neled beneath the skin to connect to the impulse generator. Following initial lead placement, the epidural needle is with- drawn slightly (~1 to 2 cm) but left in place around the lead within the subcutaneous tissues to protect the lead during the subsequent incision and dissection. A 5- to 8-cm incision parallel to the axis of the spine is extended from cephalad to caudad to the needle, extending directly through the needle’s skin entry point (Fig. The subcutaneous tissues are divided using blunt dissection until the lumbar paraspinous fascia is visible surrounding the needle shaft. The stylette is then removed from the lead, and the needle is with- drawn, using care not to dislodge the electrode (Fig. The lead is then secured to the paraspinous fascia using a speciﬁc anchoring device supplied by the manufacturer Figure 16-6. The elec- If lead placement has been carried out in the prone trode contains a wire stylette that has a slight angulation at the position and the impulse generator is to be placed in distal tip. The electrode can be directed medially or laterally as it is advanced under ﬂuoroscopic guidance by using a slight twist- the abdominal wall, the lead must be coiled beneath the ing motion on the proximal electrode that changes the direction skin, the paraspinous incision temporarily closed using of the tip. The 226 Atlas of Image-Guided Intervention in Pain Medicine Tip of spinal cord stimulator electrode Pedicles aligned equidistant from spinous processes Line connecting spinous processes (approximate midline) A B Figure 16-7. Note that the lead lies just to the left of midline and has a slight medial-lateral angulation. Optimally, the electrode’s course should be parallel to midline so any migration is most likely to move adjacent electrodes into similar positions to one another. After repeat preparation of the skin and application of sterile drapes, attention is turned to creating the pocket within the patient’s abdominal wall or overlying the buttock (when the impulse generator is placed over the buttock, this site is included in the initial skin preparation and drap- ing). An 8- to 10-cm transverse incision is made along the previously marked line and a subcutaneous pocket is created using blunt dissection (Fig. The pocket should always be created caudad to the incision; if the pocket is placed cephalad to the incision, the weight of the impulse generator on the suture line is likely to cause wound dehiscence. In many patients, the blunt dissection can be accomplished using gentle but firm pressure with the fingers. It is simpler and less traumatic to use a small pair of surgical scissors to perform the blunt dissection using repeated opening (not closing or cutting) motions or with an electrocautery device used in the cutting mode. The impulse generator should fit com- Sterile bandage strips are placed along the course of the elec- trode as it exits the skin and then crisscrossed at the base of pletely within the pocket without any part of the device the electrode to anchor it ﬁrmly in place. There Chapter 16 Spinal Cord Stimulation System Placement 227 A Odontoid C2 Tip of process spinal cord stimulator C3 electrode C4 Mandible C5 C6 Line connecting C7 spinous processes (approximate midline) T1 B C Figure 16-9. The patient must face directly forward without any rotation of the head and the C-arm must be carefully aligned to ensure there is no rotation, with the spinous processes aligned in the mid- line, midway between the vertebral pedicles. The skin entry point for the epidural needle is placed just inferior to the inferior margin of the pedicle two interspaces below the interspace to be entered (typically T1/T2 for upper extremity stimulation with skin entry just inferior to the T3 pedicle). The needle should enter the interspace well below the lamina of the vertebra border- ing the superior aspect of the interspace and just to the left or right of midline on the side where you are attempting to advance the electrode.
A 20-year-old woman is 21 weeks pregnant and initial antibody detection (screen) results are below buy avalide on line. Anti-Fy Concept: Anti-K is an IgG reactive antibody discount avalide 162.5mg amex, which is known to be clinically signifcant order discount avalide on line. Anti-K does not bind complement order avalide with visa, but the antibody is able to cause extravascular hemolysis. Therefore, anti-K is typically considered clinically signifcant at a titer of 8, in contrast to other antibody groups that are considered signifcant at a titer of ∼16. None of the other antibodies are consistent with the screen results (Answers A, B, C, and E). Antibodies in the Lutheran system are generally not considered clinically signifcant. If a Lutheran antibody is associated with a hemolytic transfusion reaction, the reaction is generally mild. Lutheran antigens demonstrate variable strength observed in serologic testing, which accounts for the characteristic mixed-feld agglutination patterns observed. Lutheran antigens are present on blood vessels and tissues including brain, heart, kidney, liver, lung, placenta, pancreas, atrial wall, tongue, trachea, skin, skeletal muscle, cervix, ileum, colon, stomach, and gall bladder, but are not present on lymphocytes, granulocytes, monocytes and platelets. The antigens are detected on fetal cells at 10–12 weeks gestation and are poorly developed at birth. Answer: B—Lutheran antibodies are adsorbed by the Lutheran antigens present on the placenta and Lutheran antigens are only weakly expressed on cord cells. Lutheran antigens are able to stimulate IgG clinically signifcant antibodies, evidenced in a mild to moderate transfusion reactions which have been documented in the literature. The most common phenotype in the Duffy blood group system in the Caucasian population is which of the following? The system is made up of two common antigens which result in the common phenotypes of Fy(a+b−)/ in 20% of the Caucasian population, Fy(a+b+) in 48% of the Caucasian population and Fy(a−b+) in 32% of the Caucasian population. A null expression Fy(a−b−) is associated with black phenotypes with up to 67%–70% of African Americans lacking the Duffy antigens. Answer: B—Although Fy(a−b−) is the most common phenotype in the African/Black population (Answer D), the Fy(a+b+) phenotype is most common in the European/white populations (83%). Fy(a+b−) (Answer C) is the second most common phenotype in the Caucasian population. Fy(a−b−) x phenotypes (Answer D) are most common in individuals of African descent. The Fy (Answer E) allele correlates with an unusual weak expression of Fy antigen in a Caucasian. Of the following phenotypes, the most common among individuals of African ancestry is which of the following? Jk(a+) phenotypes are found in 91% of African/Black populations while only 77% of the European/Caucasian population. Another example is Jk(b−) phenotype is found in 57% of African/Black population while only 28% of the European/ Caucasian Anti-Jk3 made to a high prevalence antigen is produced by individuals who are Jk(a−b−) phenotype. This expression is more prevalent in Philippino, Polynesian, Chinese, Japanese, and Indonesian populations. The rare Jk(a−b−) (Answer D) phenotype is associated with Pacifc islander, Japanese and Chinese populations. None of the other choices (Answers B, C, and E) are correct for this ethnic group. Studies by Peter Agre on aquaporin-1 lead to the discovery of the frst water transporter in man and only the second Nobel Prize in Transfusion Medicine. The Colton blood group system is made up of four a b a b antigens (Co , Co , Co3, and Co4). These antigens are one antithetical pair (Co and Co ) and two a b high incidence antigens (Co3 and Co4). In a application, the majority of the population would be incompatible with a patient who has anti-Co b (99. On the other hand if a patient has an antibody to a low prevalence antigen, such as Co , most of the population will be compatible. In addition, they are able to cause severe hemolytic disease of the fetus and newborn. None of the other choices (Answers B, C, D, and E) are correct based on the information above. Anti-Yt is identifed in a 72-year-old male and the attending physician wants to transfuse urgently. Since anti-Yt is an antibody to a high prevalence antigen, the majority of the population will be incompatible with the patient’s sample. However, rare Yt(a−) red blood cell units may be difficult to find locally and may require a search with the national rare donor registry. However, the clinical signifcance of the antibody is unknown without further advanced testing, such as antibody subclass testing, Monocyte Monolayer Assay, or chromium labeled studies. It may be helpful to know the IgG subclass (Answer C), but this will not provide information to determine clinical 51 signifcance. The Cr (Answer B) red cell survival studies are rarely performed to assess antibody signifcance and given the urgency would not be completed for this type of antibody of variable clinical signifcance. One would only need Yt(a−) donor units through a national search (Answer D) if the patient’s antibody has demonstrated decreased red cell survival in previous analysis. The family (Answer E) is a possibility for compatible donors, but in the scenario provided this is an urgent provision of blood. There is not time for screening, collection, and provision of dedicated donors for this patient. What type of antigenic determinant and antibody class is most likely present in the given antibody detection (screen) results below? Protein type blood group antibodies, such as Rh, Kell, Duffy, or Kidd are typically IgG in nature. These antibodies are not generally naturally occurring, but stimulated by red cell exposure from transfusion, transplantation, and/or pregnancy. The Transfusion Service chooses red cell donor units which lack the specifcity that is detected to prevent acute and/or delayed hemolysis in the presence of the IgG antibody. Answer: D—The antibody detection test (screen) is non-reactive at immediate spin; therefore, there is not an IgM directed to carbohydrate blood group (Answers A and E) specifcity detected. Protein blood group system antibodies are more likely to be IgG, whereas carbohydrate blood group antibodies are likely to be IgM (Answer B). An antibody identifcation panel showed similar results (weak + to 2+ positive) with all panel cells tested. A sample was sent to the Immunohematology Reference a Laboratory and an anti-McC was identifed. These IgG antibodies can be of high titer, >16 and are of low avidity, showing weak, variable reactivity (Table 6. Antibodies to antigens in these systems are typically considered clinically insignifcant. They do not cause hemolytic transfusion reactions or hemolytic disease of the fetus or newborn. Given the high frequency of the antigens virtually all crossmatches will be incompatible. Blood Group AntiGens And AntiBodies 135 The patient may be genotyped or phenotyped if they have not been transfused and all subsequent transfusions provided are phenotype-matched. Please answer questions 35–37 based on the following clinical scenario: A 40-year-old African-American woman, G3P1001, presents at a local clinic with generalized weak- ness. Per her medical record, the patient was previously transfused for anemia of unknown origin. Due to the current anemia, the provider ordered 2 units of leukocyte-reduced red blood cells to be transfused. Routine pretransfusion testing showed she was B Positive and the antibody detection test (screen) was positive with all three screening cells tested using an automated Gel test.
All the protons (hydrogen ions) wobble in a chaotic manner and cancel out any magnetism generic 162.5 mg avalide amex. Once the protons (hydrogen ions) are aligned discount avalide 162.5 mg on line, a radio frequency pulse is applied cheap avalide 162.5mg without a prescription, which pushes the protons (hydrogen) into a higher energy level buy generic avalide 162.5 mg on-line. The radio is then turned off, and the higher energy gained by the protons (nuclear magnetic resonance signal) dissipates and is transmitted to the receiver coils. The protons (hydrogen) in different types of tissues realign at different speeds and produce different signals. T1-weighted images produce hyperintense signal with fat, bone marrow, nerves, and lipomas. T2 T2 images are produced by measuring the time needed for the axial spin to return to its rest state. T2-weighted images produce hyperintense signal with water (inflammation), blood, edema, and fluid-filled tumors. Most diseases manifest themselves by an increase in water content (inflammation); so T2 images are referred to as the pathologic image. The high signal produced by fat can mask subtle contrast differences, which can mask pathology. Radioactive compounds (radiopharmaceuticals) are slowly injected into the patient and localized in specific organs. A scintillation probe or detector is positioned over the target, and emitted gamma photons are converted to visible light and counted. Hot spot: Area of high radiopharmaceutical uptake Cold spot: Area of low radiopharmaceutical uptake Identifies areas of increased bone turnover or osteoblastic activity (i. Normal uptake is found in tendon insertions and epiphyseal plates, and areas of constant stresses or osseous remodeling. Osteoblastic-mediated chemo-absorption onto the surface of hydroxyapatite crystals Physical half-life of 6 hours Useful 140-keV gamma photon 50% is excreted by the kidney; so adequate hydration/voiding is important to reduce the radiation exposure to bladder wall. Shows dynamic visualization of blood flow Provides information about the relative blood supply to the extremity 2nd phase—blood pooling images Images are taken 5 to 10 minutes following injection. Quantifies relative hyperemia or ischemia 3rd phase—delayed image (bone-imaging phase) Images are taken 3 to 4 hours following injection. Visualizes regional rates of bone metabolism This phase is useful to determine cellulitis vs. By the 3rd phase with cellulitis, there should be a flushing and cleaning returning toward normal density. With osteomyelitis, Tc-99 will incorporate into the bone and show increased density. Used in the diagnosis of osteomyelitis; at this phase, it shows greater bone activity and less soft tissue activity. If the ratio at 24 hours has increased more than one whole number compared with the 3rd phase, it is positive for osteomyelitis. If the ratio at 24 hours is decreased more than one whole number compared with the 3rd phase, it is negative for osteomyelitis. If the ratio at 24 hours is less than a whole number different compared with the 3rd phase, it is inconclusive. Identifies neoplasms and inflammatory disorders Imaging is performed at 6 to 24 hours for infections. Imaging is performed at 24 to 72 hours for tumors Excreted by the kidneys Half-life is 78 hours; thus, radiation dose is high. More accurate at assessing acute infection, while Ga-67 is more sensitive for subacute and chronic infection Half-life is 67 hours. Indium is more accurate at assessing infection if gallium studies are inconclusive. Thallium-201 (Ti-201) Used to assess foot perfusion Combined Tc and Ga Bone Scan Combining technetium (bone- imaging radionuclide) and gallium (inflammatory-imaging nuclide) gives more information than either scan alone. Technetium should be given first, because it has a shorter half-life, followed by gallium at 24 to 48 hours. When referring to Tc as either (+) or (−), they are referring to phase 3 (bone-imaging phase). It is also referred to as a C-arm because the unit is the shape of a “C,” with the x-ray beam at one end and the image receptor at the other. It is a mobile unit that can be easily manipulated in surgery to assess joint motion and internal fixation or to locate foreign bodies. Examples of hyperechoic structures include bone, scar tissue, tendon (hyperechoic relative to muscle), ligament, nerves (hyperechoic relative to muscle), ulcer sinus tract (relative to surrounding ulceration). Examples of hypoechoic structures include fluid-filled cyst, muscle, ulcerations, inflammation, tendon tears. Homogeneous Uniform in pattern Heterogeneous Irregular in pattern Identifying Foot Pathology with Ultrasound Plantar Fasciitis Normal plantar fascia is less than 4 mm in thickness, and hyperechoic with multiple parallel lines on longitudinal scan. Abnormal plantar fascia measures greater than 4 mm thick and decreased echogenicity indicative of inflammation. Plantar Fibromas Fusiform-shaped heterogeneous hypoechoic mass adjacent to the plantar surface of the plantar fascia Morton Neuroma A discrete well-defined round hypoechoic mass just proximal to the metatarsal head in the interspace Ganglion Presents as a well-defined anechoic (black) lesion Tendinosis and Tendon Tears Present as hypoechoic thickening (inflammation); may also be hypoechoic area surrounding the tendon indicative of fluid and inflammation. The torn 262 fusiform portion of tendon is heterogeneous as compared with the rest of the tendon. In general, less aggressive lesions have a narrow zone of transition, a geographic pattern of destruction, and no periostitis of adjacent soft tissue involvement. Codman Triangle 264 A triangle elevation of the periosteum seen in osteogenic sarcoma and other condition including hemorrhage and acute osteomyelitis Sunburst Delicate rays of periosteum bone formation separated by spaces containing blood vessels Seen with Ewing sarcoma, osteogenic sarcoma, chondrosarcoma, fibrosarcoma, leukemia, and acute osteomyelitis Onion Skin Multiple layers of new periosteal bone Seen in Ewing sarcoma, eosinophilic granuloma, lymphoma of bone, osteogenic sarcoma, and acute osteomyelitis Hair on End 265 Similar to sunburst pattern, but rays are all parallel Rays of periosteal bone project in a perpendicular direction to the underlying bone. Radiographic appearance: Homogenous radiodense bony protrusion from the surface of bone. Multiple osteomas may be seen in Gardner syndrome (familial polyposis of the large bowels, supernumerary teeth, fibrous dysplasia of the skull, 270 and epithelial cysts). Osteoid Osteoma Benign bone forming tumor Occurs in the first and second decades of life More common in males (2:1) Occurs in the diaphysis of long bones (esp. Occurs in the foot 5% to 8% of the time, and the talus and calcaneus are most commonly involved. Radiographic appearance: Oval or round radiolucent area (nidus), measuring <2 cm in diameter surrounded by a zone of uniform bone sclerosis Enostosis (Bone Island) Benign bone forming lesion; it is technically a hamartoma (normal tissue in an abnormal location). Most commonly seen in the proximal femur, pelvis, and ribs, but any osseous site can be involved Radiographic appearance: Intramedullary sclerotic area with discrete margins and radiating spicules. Lesions do not distort the shape of the bone or protrude from the cortical surface. Osteoblastoma (Giant Osteoid Osteoma, Osteogenic Fibroma) Rapidly growing benign bone forming tumor; rarely becomes malignant Occurs in the second and third decades of life More common in males Most commonly seen in the spine, skull, and the diaphysis of long bones Mild pain worse at night not relieved by aspirin Radiographic appearance: Well-circumscribed, expansile, osteolytic lesion (>1 cm) with areas of calcifications and cortical thinning. Ossifying Fibroma Benign bone forming tumor closely related to fibrous dysplasia 271 Occurs during the second, third, and fourth decades when found in the face, and the first and second decades of life when found in the legs The most common site of these lesions is the mandible. Lesions in the leg are usually in the tibia and located in the distal anterior diaphysis of the cortex and may lead to enlargement and bowing of the bones. Radiographic appearance: Intracortical osteolytic lesion with a ground glass appearance that may be a single confluent region or a multiple elongated bubbly area clearly delineated by a band of sclerosis. Osteosarcoma (Osteogenic Sarcoma) Malignant bone forming tumor Age 10 to 25 years and >40 years Male to female distribution is equal. Most commonly found in the metaphyseal region around the knee (distal femur or proximal tibia) Usually occurs in teenagers during rapid growth spurts or in patients over 40 who have a preexisting condition most notably Paget disease Symptoms: Pain, swelling, and fever (R/O osteomyelitis); the osteoid- producing nature of the tumor often yields an elevated alkaline phosphatase level. Radiographic appearance: Appearance is variable depending on osteolytic or sclerotic nature of lesion. Penetration of cortical bone usually occurs with a Codman triangle or “sunburst” appearance. Chondroma Tumors composed of hyaline cartilage Many different subtypes depending on location or associated findings (see below) b. Enchondroma Chondroma arising within the medullary canal of bone Benign cartilage forming tumor Occurs in third and fourth decades of life Male to female distribution is equal. Mostly found in the metaphysis and diaphysis of the tubular bones in the hands, and also can be found in the pelvis where less than 1% may become malignant 272 While mostly found in the hand, it is one of the more common benign pedal tumors and is usually found in the proximal phalanges. Radiographic appearance: Well-defined medullary lesion with some calcification, a lobular contour, and endosteal erosion. Ecchondroma (periosteal chondroma) Chondroma arising on the surface of bone (just beneath the periosteum) May occur in any age group, but mostly during the second decade of life Male to female distribution is equal. Enchondromatosis (Ollier dz) Multiple chondromas (dispersed asymmetrically around the skeleton) Occurs during the first decade of life 30% of cases become malignant.
Treatment Treatment should be started promptly pending completion of investigations 162.5mg avalide mastercard, particularly in acute-onset weakness discount 162.5 mg avalide with visa, dysphagia buy discount avalide 162.5 mg online, respiratory insufficiency discount avalide 162.5 mg overnight delivery, and systemic complications. Exercise should be used with caution during periods of disease activity, but there is no evidence that it causes prolonged worsening in muscle enzyme levels or inflammation. This may confer a risk factor for developing adult myositis, suggesting vitamin D replacement therapy is important. If treatment is withheld due to an absence of myositis, the patient should be followed closely, especially in the first 2 years after onset to avoid delay in treatment should myositis develop. One retrospective study estimated a mortality rate of 22%, mostly due to malignancy and pulmonary disease. Some clinical benefits seen with reduced enzyme levels in each case Anakinra 12-month open label trial. Anakinra treatment in patients with refractory inflammatory myopathies and possible predictive response biomarkers: a mechanistic study with 12 months follow- up. If there is continued decline in strength or function, immunosuppression should be discontinued. Patients may need assistance with daily activities within 10 years and some may be wheelchair bound within 15 years from onset of symptoms. Differential diagnosis of muscle weakness in childhood Muscle weakness may be a sign of muscle disease or a manifestation of a muscle function-related pathology or even general pathology. Juvenile polymyositis • Is very rare and results in more clinically apparent proximal and distal muscle weakness with little skin involvement. Consensus treatments for moderate juvenile dermatomyositis: beyond the first two months. Results of the second Childhood Arthritis and Rheumatology Research Alliance consensus conference. Patients with ‘large vessel vasculitis’ and ‘small vessel vasculitis’ can have disease that affects some medium-sized vessels. However, this is a useful framework for the clinician, since categorizing the patient into one of these groups can narrow the differential diagnosis considerably. Single-organ vasculitis • Cutaneous leucocytoclastic angiitis • Cutaneous arteritis • Primary central nervous system vasculitis • Isolated aortitis • Others. Vasculitis associated with systemic diseases • Lupus vasculitis • Rheumatoid vasculitis • Sarcoid vasculitis • Others. General principles of vasculitis management • To be complete, any evaluation of a chronic disease (such as primary systemic vasculitis) must include both an assessment of disease activity and of disease damage. The concept of damage denotes the aspects of disease that are unlikely to reverse with immunosuppression (such as pulmonary fibrosis or renal insufficiency). This index provides another useful method of classifying patients with vasculitis. Large vessel vasculitis • The ‘large vessels’ include the aorta and its main branches (i. Subclavian involvement causes arm claudication and diminished pulses on examination. The pulmonary arteries can also be involved, although this is relatively uncommon. Presentation • Systemic symptoms are common in the early phase of the disease, including fever, malaise, weight loss, and fatigue. The majority of patients (75%) will have some impairment of daily living, and 50% are permanently disabled. The main complications are exacerbation of hypertension and congestive cardiac failure. The anaesthetist should be made aware of the diagnosis, as the patient may require invasive blood pressure monitoring during delivery. Shoulder and pelvic girdle pain which is primarily muscular in the absence of true muscle weakness. Presentation • Severe headache and scalp tenderness localized to the occiput or temporal area are common initial symptoms, and are present in 70% of cases. Patients may describe symptoms of amaurosis fugax by temporary ‘curtaining’ of the visual field. A history of prior transient visual loss is the strongest predictor for subsequent permanent visual loss. Biopsies may be helpful to confirm the diagnosis up to 2 weeks after steroids are started. Various abnormalities described include stenosis, occlusion and the presence of a hypoechoic ‘halo’ (halo sign) around the temporal arteries. The American College of Rheumatology 1990 criteria for the classification of the giant cell arteritis. Non-specific abdominal pain, gut/gallbladder infarction, and pancreatitis are all features. Nasal or oral inflammation: development of painful or painless oral ulcers or purulent or bloody nasal discharge. Abnormal chest radiograph: the chest radiograph may show nodules, cavities, or infiltrate. Ear, nose, and throat symptoms • Up to 90% of patients have ear, nose, and throat involvement. Subglottic stenosis may worsen even when a patient is otherwise in remission, and responds better to steroid injections than systemic therapy. Multiple nodules with or without cavitation are found in the lungs of asymptomatic patients. Eye disease • Granulomatous lesions may obstruct the nasolacrimal duct and cause orbital pseudotumour, with optic nerve compression from masses developing in the retrobulbar space. Bronchoscopy with bronchoalveolar lavage will demonstrate haemosiderin-laden macrophages. Many of these patients will have been treated with a leukotriene inhibitor (although leukotriene inhibitors do not cause the disease). Other treatments • Plasma exchange has been used with some effect in those with severe renal disease, although the benefit is transient. Modern immunosuppressive regimens have transformed these diseases into chronic conditions, characterized by cycles of relapse and remission. A randomized trial of maintenance therapy for vasculitis associated with antineutrophil cytoplasmic autoantibodies. Mycophenolate mofetil vs azathioprine for remission maintenance in antineutrophil cytoplasmic antibody-associated vasculitis: a randomized controlled trial. Pulse versus daily oral cyclophosphamide for induction of remission in antineutrophil cytoplasmic antibody-associated vasculitis: a randomized trial. Randomized trial of cyclophosphamide versus methotrexate for induction of remission in early systemic antineutrophil cytoplasmic antibody- associated vasculitis. Small vessel vasculitis The definition of small vessel vasculitis is open to different interpretations. However, there are a range of clinical and pathological features that define a specific group of small vessel vasculitides outlined in Table 15. Leucocytoclastic vasculitis • Histologically, leucocytoclastic vasculitis appears as a neutrophil infiltration in and around small vessels, with fragmentation of the neutrophils (leucocytoclasis), fibrin deposition, and endothelial cell necrosis. However, the division into leucocytoclastic and non-leucocytoclastic (lymphocytic) vasculitis is not absolute. Likewise, the clinical presentation of cutaneous vasculitis can vary considerably. Analgesia may be needed and systemic steroids may be required for acute organ disease, especially progressive renal impairment. Such patients should be evaluated for the presence of a monoclonal IgA antibody, which may herald a pre-malignant lesion. Urticarial vasculitis • Urticarial lesions with arthralgias are the most common features of this condition, with men outnumbering women by 2:1. Less common manifestations include lymphadenopathy, uveitis, and benign intracranial hypertension.