tag:blogger.com,1999:blog-33284146578008955402024-02-19T17:50:38.303-08:00October 2010 ArchiveArchive of Critical Care pearls from www.icuroom.netUnknownnoreply@blogger.comBlogger31125tag:blogger.com,1999:blog-3328414657800895540.post-73644645346479906052010-10-31T07:48:00.000-07:002010-10-31T07:48:00.523-07:00<span class="Apple-style-span" style="font-family:Arial, Helvetica, sans-serif;font-size:medium;"><p align="left"><span class="sub_abstract_label"><span class="Apple-style-span"><i><span style="color:#003333;"><span class="Apple-style-span">Q: </span><span class="Apple-style-span">54 year old male is in ICU after Traumatic Brain Injury. Follow up CT scan shows cerebral edema. Resident ordered Mannitol. After 4 doses of Mannitol patient oxygen requirement on ventilator increased and CXR shows pulmonary edema. Resident ask you: If we are using mannitol to relieve cerebral edema than why does it cause the pulmonary edema?</span></span></i></span></span></p><p align="left"><span class="sub_abstract_label"><span class="Apple-style-span"><i><br /><strong></strong></i></span></span></p><p align="left"><span class="sub_abstract_label"><span class="Apple-style-span"><strong>Answer:</strong></span></span></span></p> <span style="color:#000000;">In patients with underlying cardiac or/and renal insufficiency, circulatory volume overload may occur due to expansion of extracellular fluid after serial mannitol administration causing pulmonary edema. It is true that mannitol is an osmotic diuretic but overwhelming hydrostatic pressure due to poor urinary output and underlying compromised cardiac function offsets the increased oncotic pressure and may lead to extravasation of fluid. </span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-33578342505951488422010-10-30T06:33:00.000-07:002010-10-30T19:57:28.090-07:00Mechanical AVR - Lower the INR?<br /><br /><span style="color:#000000;">BACKGROUND: Moderate anticoagulation after mechanical heart valve replacement has been proposed to reduce the risk of bleeding related to lifelong anticoagulation. However, the efficacy of such reduced antithrombotic regimens is still unknown. The present prospective open-label, single-center, randomized controlled trial aimed to evaluate the safety and feasibility of reduced oral anticoagulation after isolated mechanical aortic valve replacement.<br /><br />METHODS: Low-risk patients undergoing bileaflet mechanical aortic valve replacement were randomized to a low International normalized ratio (INR) target (1.5-2.5; LOW-INR group) or to the standard currently recommended INR (2.0-3.0; CONVENTIONAL-INR group) through daily coumarine oral therapy. No aspirin was added. Median follow-up was 5.6 years. The primary outcome was assessment of noninferiority of the low over the standard anticoagulation regimen on thromboembolic events. Secondary end point was the superiority of the reduced INR target strategy on bleeding events.<br /><br />RESULTS: We analyzed 396 patients (197 in the LOW-INR group and 199 in the CONVENTIONAL-INR group). The mean of INR was 1.94 +/- 0.21 and 2.61 +/- 0.25 in the LOW-INR and CONVENTIONAL-INR groups, respectively (P less than .001).<br /><br />One versus three thromboembolic events occurred in the LOW-INR and CONVENTIONAL-INR, respectively, meeting the noninferiority criterion (P = .62). </span><p align="left"><span style="color:#000000;">Total hemorrhagic events occurred in 6 patients in the LOW-INR group and in 16 patients in the CONVENTIONAL-INR group (P = .04). </span></p><p align="left"><span style="color:#000000;">CONCLUSIONS: LOWERING-IT trial established that the proposed LOW-INR target is safe and feasible in low-risk patients after bileaflet aortic mechanical valve replacement. It results in similar thrombotic events and in a significant reduction of bleeding occurrence when compared to the conventional anticoagulation regimen. </span><br /><br /><br /><span style="font-size:85%;">LOWERing the INtensity of oral anticoaGulant Therapy in patients with bileaflet mechanical aortic valve replacement: results from the "LOWERING-IT" Trial, Am Heart J. 2010 Jul;160(1):171-8.</span></p>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-84744360209368987722010-10-29T00:12:00.000-07:002010-10-29T00:12:00.573-07:00<span style="color:#660000;">Q:</span> <em><span style="color:#003333;">43 year old female is transferred to ICU with diagnosis of thrombocytopenic purpura (TTP). Looking at previous record you found similar episode 4 years ago. It is mentioned that patient didn't respond to regular plasma exchange and required cryo-poor plasma exchange. What is cryo-poor plasma?<br /></span></em><br /><br /><span style="color:#660000;">Answer:</span> <span style="color:#000000;">Cryo-poor plasma or cryosupernatant refers to plasma from which the cryoprecipitate has been removed. The resulting plasma has reduced levels of Factor VIII, von Willebrand factor, Factor XIII, fibronectin and fibrinogen.<br /><br />Cryo-poor plasma is used for the treatment of relapsing TTP for which regular plasma exchange is not effective. The rationale for using cryo-poor plasma in these refractory patients is that no additional von Willebrand factor will be administered to these patients who already have too much von Willebrand factor activity due to the presence of extra-large multimers of vWf.<br /><br /><span style="color:#003333;">Caution:</span> <em>It is not a component regularly stocked in the blood bank. Usually it will require special preparation, requiring advance notice.</em></span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-31894848400108973132010-10-28T02:39:00.000-07:002010-10-28T20:18:10.064-07:00<span style="color:#660000;">Q:</span> <em><span style="color:#336666;">28 year old male is admitted with headache and back pain after a fall. Neurologist was called in ER who ordered CT of head and spine. ER physician called you admit patient for observation with diagnosis of pneumorrhachis. What is pneumorrhachis?</span></em><br /><br /><span style="color:#660000;">Answer:</span> <span style="color:#000000;">Pneumorrhachis means the presence of intraspinal air. It usually reabsorbs spontaneously and patients usually are managed conservatively but entrapped air may cause syndromes of intracranial and intraspinal hypertension. Clinical significance lies in finding potentially associated hidden and life threatening injuries. See below posterior epidural pneumorrhachisvwith pneumomediastinum.</span><br /><br /><img id="BLOGGER_PHOTO_ID_5532844355606854738" style="DISPLAY: block; MARGIN: 0px auto 10px; WIDTH: 325px; CURSOR: hand; HEIGHT: 400px; TEXT-ALIGN: center" alt="" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj7gTFn07NAXf8MCwG0x6BQApjCP8cxr7EiUUJ-1HIcy-y9yymD6TY6k-G4wivMk1z82hVihoHyzZNBb9RwYR8UcmPG0acMU5NGUGX3Hy0bvtSA3UwAQuZxXU9Ll0Kp0Q4s-FQgHbm9cFBZ/s400/pr.JPG" border="0" /><br /><div></div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-29975034979331594002010-10-27T09:00:00.000-07:002010-10-28T20:19:35.956-07:00<div align="center"><strong>Picture Diagnosis?<br /></strong><br /></div><p><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi5zVXUyLfJLVS7_mmKUXhTTso7UzKCBZ8DvTKoWEj_8qzHNJ0y3KUjCYBuoALhSfP0quot6Hc2o12E170dAR7XT96xnAQCWoq31byyDXsZ3hiHqFC5s2onxgnokTz3-HynP8XEYgPQrb0h/s1600/ssat3.jpg"><img id="BLOGGER_PHOTO_ID_5532571392621986130" style="DISPLAY: block; MARGIN: 0px auto 10px; WIDTH: 400px; CURSOR: hand; HEIGHT: 327px; TEXT-ALIGN: center" alt="" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi5zVXUyLfJLVS7_mmKUXhTTso7UzKCBZ8DvTKoWEj_8qzHNJ0y3KUjCYBuoALhSfP0quot6Hc2o12E170dAR7XT96xnAQCWoq31byyDXsZ3hiHqFC5s2onxgnokTz3-HynP8XEYgPQrb0h/s400/ssat3.jpg" border="0" /></a><br /><br /><strong><span style="color:#660000;">Answer:</span> </strong>Subsegmental (or platelike or discoid Atelactasis)<br /><br />It occurs due to obstruction of a small bronchus and may be seen in hypoventilation, pulmonary embolism, or pneumonia. Its called platelike atelactasis as it resembles the side-view of a dinner plate (see below).</p><p><br /><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJIX9daBChnX_YkbdVDnNd_bIFlCFPpdvMgxSljwHv2JUIw2XLZ8ggSQ5yKAM_YcOB7JduQ-x0cBW-LFKyL1D58oFpnOGfRhVQJtf_kvcsnqK_ynBt6Aanv7fGmnZUI7de4MdwXJBLfanX/s1600/ssat2.jpg"><img id="BLOGGER_PHOTO_ID_5532571390494349714" style="DISPLAY: block; MARGIN: 0px auto 10px; WIDTH: 358px; CURSOR: hand; HEIGHT: 400px; TEXT-ALIGN: center" alt="" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJIX9daBChnX_YkbdVDnNd_bIFlCFPpdvMgxSljwHv2JUIw2XLZ8ggSQ5yKAM_YcOB7JduQ-x0cBW-LFKyL1D58oFpnOGfRhVQJtf_kvcsnqK_ynBt6Aanv7fGmnZUI7de4MdwXJBLfanX/s400/ssat2.jpg" border="0" /></a> </p>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-67540729159812888462010-10-26T00:08:00.000-07:002010-10-26T00:08:00.384-07:00<span style="color:#660000;">Q:</span> <em><span style="color:#003333;">Steroids and diuretics are indicated in treatment of Transfusion-related acute lung injury (TRALI)<br /><br />A) True<br />B) False<br /><br /></span></em><br /><br /><span style="color:#660000;">Answer</span>: <span style="color:#000000;">False<br /><br />So far there is no evidence that steroids are helpful in TRALI. Another mistake would be to administer diuretics. TRALI is associated with microvascular damage and not fluid overload, so diuretics are not really helpful and actually not recommended. Since the pulmonary edema in TRALI is not related to fluid overload or cardiac dysfunction, it is logical that maintenance of adequate circulating volume is more beneficial - so it may even require IV fluid. Ventilatory assistance and circulatory support are the mainstays of treatment of TRALI. Diuretic use may be detrimental and could lead to hypotension.<br /><br />TRALI is essentially a clinical diagnosis but one laboratory finding may include sudden fall in serum albumin. </span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-48469369718946250102010-10-25T06:21:00.000-07:002010-10-25T06:21:00.746-07:00<div align="center"><span style="color:#000000;">Tamponade & Echo guided Pericardiocentesis</span><br /><br /><object height="385" width="480"><param name="movie" value="http://www.youtube.com/v/7awdcbSfnFU?fs=1&hl=en_US"><param name="allowFullScreen" value="true"><param name="allowscriptaccess" value="always"><embed src="http://www.youtube.com/v/7awdcbSfnFU?fs=1&hl=en_US" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385"></embed></object></div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-30520695783263827462010-10-24T09:08:00.000-07:002010-10-24T09:08:00.490-07:00<span style="color:#660000;">Q:</span> <em><span style="color:#003333;">58 year old male with mechanical valve mitral valve replacement has 'little rocky course' post operatively in ICU. Patient was managed with IV heparin. Patient is initiated on Warfarin. Last INR was 3.8. Heparin is discontinued but laboratory called this morning with positive OD of 2.4 for 'HIT' (Heparin Induced Thrombocytopenia). Your next action would be?<br /><br />A) Continue present management with Warfarin<br /><br />B) Continue Warfarin but increase the INR target<br /><br />C) Discontinue Warfarin<br /><br />D) Discontinue Warfarin and start Argatroban<br /><br />E) Discontinue Warfarin, administer vitamin K and start Argatroban<br /></span></em><br /><br /><br /><br /><span style="color:#660000;">Answer</span>:<span style="color:#000000;"> E<br /><br />Warfarin may cause microthrombosis in patients HIT. These patients typically have severe protein C depletion. If warfarin has already been started, vitamin K should be given. Warfarin should not started before the platelet count is above 150.<br /><br />In above question A and B are wrong as warfarin should be discontinued. C and D are right but not enough. E is the complete answer.<br /></span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-11154867509621078972010-10-23T07:09:00.000-07:002010-10-23T07:09:00.658-07:00<span style="color:#000000;">On therapeutic hypothermia<br /></span><br /><span style="color:#660000;">Q:</span><em><span style="color:#003333;"> How much cerebral metabolism goes down with reduction of each 1*C?<br /><br /></span></em><br /><span style="color:#660000;">Answer:</span> <span style="color:#000000;">About 7%<br /><br />Rationale for the effects of hypothermia as a neuroprotectant based on the slowing of cellular metabolism. For every one degree Celsius drop in body temperature, cellular metabolism slows by about 7%. Probably hypothermia reduces the harmful effects of ischemia by decreasing the body’s need for oxygen. More recent data suggests that hypothermia affects pathways that extend beyond a decrease in cellular metabolism.</span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-18366441046170051622010-10-22T10:36:00.000-07:002010-10-22T10:36:00.436-07:00<span style="color:#660000;"><p><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><span style="font-size:85%;">Mnemonics for <span style="COLOR: rgb(0,0,0)">Infective endocarditis Duke criteria </span></span></span></span></p><p align="center"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)">BE FEVEER</span></span></span></p><p align="left"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><span style="color:#660000;">Major:</span></span></span></span></p><p align="left"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><span style="color:#000066;"><span style="COLOR: rgb(0,0,0)"><span style="color:#000066;">B =</span> <span style="color:#000066;">blood culture +ve more than 2 times 12 hours part</span></span></span><span style="color:#000066;"> </span></span></span></p><p align="left"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><span style="color:#000066;">E = Endocardial involvement from Echo </span></span><span style="COLOR: rgb(0,0,0)"><br /><br /><br /><span style="color:#660000;">Minor:</span></span></span></span></p><p align="left"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><span style="color:#000066;"><span style="COLOR: rgb(0,0,0)">F<span style="color:#000066;"> = Fever</span></span> </span></span></span></p><p align="left"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><span style="color:#000066;"><span style="COLOR: rgb(0,0,0)"><span style="color:#000066;">E =</span> <span style="color:#000066;">Echo findings (not fulfilling a major)</span></span></span><span style="color:#000066;"> </span></span></span></p><p align="left"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><span style="color:#000066;"><span style="COLOR: rgb(0,0,0)">V<span style="color:#000066;"> = Vascular</span></span></span><span style="color:#000066;"> </span><span style="color:#000066;"><span style="COLOR: rgb(0,0,0)"><span style="color:#000066;">findings</span><span style="font-size:78%;color:#660000;"> *1</span></span></span></span></span></p><p align="left"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><span style="color:#000066;">E = Evidences microbiological</span></span></span></span></p><p align="left"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><span style="color:#000066;"><span style="COLOR: rgb(0,0,0)">E = <span style="color:#000066;">Evidences immunological<span style="font-size:78%;"> *2</span></span></span></span></span></span></p><p align="left"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><span style="color:#000066;"><span style="COLOR: rgb(0,0,0)">R = <span style="color:#000066;">Risk factors/predisposing factors - drug abuse, valvular diseases</span></span></span></span></span></p><p align="center"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><em><span style="color:#003300;"></span></em></span></span> </p><p align="center"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><em><span style="color:#003300;">Clinical criteria for infective endocarditis requires: </span></em></span></span></p><p align="center"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><em><span style="color:#003300;"><span class="bul"><span style="font-size:130%;">• </span></span>Two major criteria, or</span></em></span></span></p><p align="center"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><em><span style="color:#003300;"><span class="bul"><span style="font-size:130%;">• </span></span>One major and three minor criteria, or</span></em></span></span></p><p align="center"><span style="COLOR: rgb(0,0,0)"><span style="COLOR: rgb(0,0,0)"><em><span style="color:#003300;"><span class="bul"><span style="font-size:130%;">• </span></span>Five minor criteria</span></em><br /></p><p align="left"><span style="font-size:78%;">*1 </span><span style="font-family:Arial,Helvetica,sans-serif;font-size:85%;"><em>major arterial emboli, septic pulmonary infarcts, mycotic aneurysm, intracranial hemorrhage, conjunctival hemorrhages, and Janeway lesions</em></span><br /></p><p align="left"><span style="font-size:78%;"><em>*2 </em></span><span style="font-size:85%;"><em><span style="font-family:Arial,Helvetica,sans-serif;">glomerulonephritis, Osler's nodes, Roth spots, and rheumatoid factor<br /></span></p></em></span></span></span></span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-41368682008515024992010-10-21T04:56:00.000-07:002010-10-21T04:56:00.653-07:00<span style="color:#660000;">Q:</span> <em><span style="color:#003333;">Dexmedetomidine (Precedex) should be use in caution with?<br /><br />A) Renal failure<br /><br />B) Liver Failure<br /><br />C) Adrenal crisis<br /><br />D) Tachycardia<br /><br />E) Coagulopathy<br /><br /></span></em><br /><br /><span style="color:#660000;">Answer:</span> <span style="color:#000000;">( B) Liver failure<br /><br />Dexmedetomidine's undergoes hepatic metabolism. Caution should be used in patients with severe hepatic failure as elimination half life may be more than doubled. Normally dexmedetomidine has an elimination half life of 2 hours.<br /><br />It has no effect in renal failure or adrenal crisis. It does not effect coagulation. Dexmedetomidine causes bradycardia and should be use with caution in bradycardia.</span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-68142443446185811672010-10-20T05:59:00.000-07:002010-10-20T05:59:00.380-07:00<span style="color:#660000;">Q:</span> <em><span style="color:#003333;">Linezolid (Zyvox) may decrease the seizure threshold. Yes or No?</span></em><br /><br /><br /><span style="color:#660000;">Answer:</span> <span style="color:#000000;">Yes<br /><br />According to Pfizer package insert (maker of Zyvox):<br /><br />"Convulsions have been reported to occur in patients when treated with Zyvox. In most of these cases, a history of seizures or risk factors for seizures was reported".<br /></span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-37070536756238477502010-10-19T06:14:00.000-07:002010-10-19T10:57:47.512-07:00<em><span style="font-size:85%;">Half dose thrombolysis in PE?</span></em><br /><span style="color:#660000;"><br /><p id="p-2">Background:<span style="color:#000066;"> Optimal dosing of the recombinant tissue-type plasminogen activator (rt-PA) is important in treating pulmonary thromboembolism (PTE). The aim of this study was to compare the efficacy and safety of a 50 mg/2 h rt-PA regimen with a 100 mg/2 h rt-PA regimen in patients with acute PTE.</span> </p><br /><p id="p-3"><span style="font-size:85%;">Methods:</span> <span style="font-size:85%;color:#000066;">A prospective, randomized, multicenter trial was conducted in which 118 patients with acute PTE and either hemodynamic instability or massive pulmonary artery obstruction were randomly assigned to receive a treatment regiment of either rt-PA at 50 mg/2 h (n = 65) or 100 mg/2 h (n = 53).<span style="color:#003333;"> <em>The efficacy was determined by observing the improvements of right ventricular dysfunctions (RVDs) on echocardiograms, lung perfusion defects on ventilation perfusion lung scans, and pulmonary artery obstructions on CT angiograms.</em></span> The adverse events, including death, bleeding, and PTE recurrence, were also evaluated</span>. </p><br /><p id="p-4">Results: </p><ul><li><span style="color:#000066;">Progressive improvements in RVDs, lung perfusion defects, and pulmonary artery obstructions were found to be similarly significant in both treatment groups. This is true for patients with either hemodynamic instability or massive pulmonary artery obstruction. </span><br /><li><span style="color:#000066;">Three (6%) patients in the rt-PA 100 mg/2 h group and one (2%) in the rt-PA 50 mg/2 h group died as the result of either PTE or bleeding. </span><br /><li><span style="color:#000066;">Importantly, the 50 mg/2 h rt-PA regimen resulted in less bleeding tendency than the 100 mg/2 h regimen (3% vs 10%), especially in patients with a body weight less than 65 kg (14.8% vs 41.2%, <em>P</em> = .049). </span><br /><li><span style="color:#000066;">No fatal recurrent PTE was found in either group</span>. </li></ul><br /><p id="p-5">Conclusions: <span style="color:#000066;">Compared with the 100 mg/2 h regimen, the 50 mg/2 h rt-PA regimen exhibits <span style="color:#660000;"><em>similar efficacy and perhaps better safety</em></span> in patients with acute PTE. These findings support the notion that optimizing rt-PA dosing is worthwhile when treating patients with PTE.</span> </p></span><br /><h4 class="cit-title-group"><a href="http://chestjournal.chestpubs.org/content/137/2/254.abstract" target="_blank"><span style="font-size:78%;color:#003333;">Efficacy and Safety of Low Dose Recombinant Tissue-Type Plasminogen Activator for the Treatment of Acute Pulmonary Thromboembolism</span></a><span style="font-size:78%;"><span style="color:#003333;"><span class="cit-sep cit-sep-after-article-title">: </span><span class="cit-subtitle">A Randomized, Multicenter, Controlled Trial - </span><cite><abbr class="site-title" title="Chest">Chest</abbr> <span class="cit-print-date">February 2010 </span><span class="cit-vol">137<span class="cit-sep cit-sep-after-article-vol">:</span></span><span class="cit-pages"><span class="cit-first-page">254</span><span class="cit-sep">-</span><span class="cit-last-page">262</span></span></cite></span></span></h4>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-45074003496283975062010-10-18T09:20:00.000-07:002010-10-18T09:20:00.174-07:00<span style="color:#660000;">Q</span>: <em><span style="color:#003333;">What is the advantage of "oily Chloramphanicol"?<br /><br /></span></em><br /><br /><span style="color:#660000;">Answer:</span> <span style="color:#000000;">Oily chloramphenicol is the oil based solution of chloramphenicol. It is a long-acting preparation of chloramphenicol.<br /><br />Oily chloramphenicol is recommended by the World Health Organization (WHO) as the first line treatment of meningitis in low-income countries. It has the great advantage of requiring only a single injection.<br /><br />Though not very much in use in USA due to its bone marrow toxicity it is essential for intensivists to be aware of advantage of this drug. It has excellent blood brain barrier penetration with activity against a wide variety of Gram-positive, Gram-negative bacteria and anaerobic organisms .</span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-32961578743798078282010-10-17T09:29:00.000-07:002010-10-17T09:29:00.271-07:00<span style="color:#990000;">Q:</span> <em><span style="color:#003333;">How much Aorta should be optimally occupied while Intra Aortic Balloon Pump (IABP) is inflated?</span><br /></em><br /><br /><br /><span style="color:#660000;">Answer:</span> <span style="color:#000000;">Optimally 85% of aorta should be occluded<br /><br />With Intra Aortic Balloon Pump (IABP) the more blood displaced during diastole, the better the augmentation but total occlusion of aorta should be avoided.</span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-63498519998074831662010-10-16T00:23:00.000-07:002010-10-16T00:23:00.699-07:00<span style="color:#660000;">Q:</span> <em><span style="color:#003333;">54 year old male is admitted to ICU with Acute renal failure and diagnosed with Adult Polycystic Kidney Disease (ADPKD). 3 hours after his first hemodialysis session patient complains of severe headache. What would be your major concern?<br /><br /><br /></span></em><br /><span style="color:#660000;">Answer</span>:<span style="color:#000000;"> Intracranial berry aneurysm<br /><br />Approximately 10% of patients with ADPKD die of a ruptured, intracranial berry aneurysm. Patients also may develop hepatic cysts, pancreatic cysts, splenic cysts and pulmonary cysts.<br /></span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-52485138855701848802010-10-15T00:03:00.000-07:002010-10-15T00:03:00.950-07:00<p><span style="color:#660000;">Q:</span> <em><span style="color:#003333;">According to a 2009 science advisory from the American Heart Association/American Stroke Association - Upto what hours the expansion of the time window can be spread for treatment of acute ischemic stroke with intravenous Tissue Plasminogen Activator?</span></em><br /></p><p><span style="color:#660000;">Answer</span>: <span style="color:#000000;"><span style="color:#000066;">4.5 hours</span></span><br /></p><p><span style="color:#000066;"><span style="color:#000066;"><span style="color:#000000;"><span style="color:#000066;">According to new recommendation<strong>:</strong></span></span></span></span><br /></p><p><em><span style="font-size:85%;color:#000000;">"rtPA should be administered to eligible patients who can be<sup> </sup>treated in the time period of 3 to 4.5 hours after stroke (Class<sup> </sup>I Recommendation, Level of Evidence B). The eligibility criteria<sup> </sup>for treatment in this time period are similar to those for persons<sup> </sup>treated at earlier time periods, with any one of the following<sup> </sup>additional exclusion criteria: Patients older than 80 years,<sup> </sup>those taking oral anticoagulants with an international normalized<sup> </sup>ratio less than/=1.7, those with a baseline National Institutes of Health<sup> </sup>Stroke Scale score more than 25, or those with both a history of stroke<sup> </sup>and diabetes. Therefore, for the 3-to-4.5–hour window,<u><sup> </sup>all patients receiving an oral anticoagulant are excluded regardless<sup> </sup>of their international normalized ratio</u>. The relative utility<sup> </sup>of rtPA in this time window compared with other methods of thrombus<sup> </sup>dissolution or removal has not been established. The efficacy<sup> </sup>of intravenous treatment with rtPA within 3 to 4.5 hours after<sup> </sup>stroke in patients with these exclusion criteria is not well<sup> </sup>established (Class IIb Recommendation, Level of Evidence C)<sup> </sup>and requires further study".</span></em></p><span style="color:#000000;"><br /><h2><span style="font-family:Arial,Helvetica,sans-serif;font-size:78%;"><a href="http://stroke.ahajournals.org/cgi/content/full/40/8/2945" target="_blank">Expansion of the Time Window for Treatment of Acute Ischemic Stroke With Intravenous Tissue Plasminogen Activator - A Science Advisory From the American Heart Association/American Stroke Association</a> - <em>Stroke.</em> 2009;40:2945.<br /></span></h2></span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-67850183822672878372010-10-14T03:57:00.000-07:002010-10-14T03:57:00.109-07:00<span style="color:#660000;">Q:</span> <em><span style="color:#003333;">What is the recommended time period between 2 contrast related studies to avoid contrast induced nephropathy?</span></em><br /><br /><br /><span style="color:#660000;">Answer</span>: <span style="color:#000000;">Ideally about 5 days</span><br /><span style="color:#000000;"></span><br /><span style="color:#000000;">If multiple studies are needed, ideally 5 days should be kept between the studies to allow the kidneys to recover fully from the contrast. </span><br /><span style="color:#000000;"></span><br /><span style="color:#000000;">Other steps should be taken like </span><br /><ul><li><span style="color:#000000;">all nephrotoxic drugs should be discontinued, </span></li><li><span style="color:#000000;">the minimal amount of contrast material should be used, </span></li><li><span style="color:#000000;">nonionic agents should be preferred, </span></li><li><span style="color:#000000;">patients should be well hydrated 12 hours before and 2 hours after a contrast-enhanced study.</span></li></ul>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-7766278726432200042010-10-13T08:00:00.000-07:002010-10-13T08:00:08.816-07:00<span style="color:#660000;">Q:</span> <em><span style="color:#003333;">28 years old male has repeated history of ED presentation with acute abdomen requiring narcotics analgesics. Record shows complete negative workup on each visit to ED. While evaluating this time your medical student suggested acute intermittent porphyria. Which test you should order?<br /></span></em><br /><br /><span style="color:#660000;">Answer:</span> <span style="color:#000000;">Urine Porphobilinogen<br /><br />Urine Porphobilinogen is a porphyrin precursor. This may not be included in hospital's standard urine porphyrin screen test and must be ordered specially. Acute intermittent porphyria patients have elevated porphobilinogen even between attacks though in some patients with long gaps between attacks, porphobilinogen may return to the normal range.</span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-81129251636726761212010-10-12T07:46:00.000-07:002010-10-12T07:46:00.153-07:00<span style="color:#660000;">Q:</span> <em><span style="color:#003333;">How much blood is needed to turn guaiac-based fecal occult blood test positive?<br /></span></em><br /><br /><span style="color:#660000;">Answer:</span> <span style="color:#000000;">About 10 ml over 24 hours<br /><br />Normally, there is only about 1-2 ml of blood a day that escapes blood vessels into the stool per day.The common, traditional guaiac-based fecal occult blood test usually picks up a daily blood loss of about 10 ml</span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-11074455659446990172010-10-11T00:13:00.000-07:002010-10-11T00:13:00.350-07:00<strong><em><span style="font-size:85%;">SVO2 vs ScVO2 - Keyword is 'trend'</span></em></strong><br /><br /><span style="font-family:Arial,Helvetica,sans-serif;color:#000066;"><strong><span style="color:#660000;">Objective</span>: To examine the validity of central venous oxygen saturation (ScvO<sub> 2</sub> ) as a numerical substitution of mixed venous oxygen saturation (SvO<sub> 2</sub> ) in adult patients undergoing normothermic on pump beating coronary artery bypass grafting (CABG). </strong></span><br /><br /><span style="font-family:Arial,Helvetica,sans-serif;color:#000066;"><strong><span style="font-size:85%;"><span style="color:#660000;">Materials and Methods:</span> Prospective clinical observational study was done at King Khalid University Hospital, King Saud University, Riyadh, Kingdom of Saudi Arabia. Thirty four adult patients scheduled for coronary artery surgery were included. Patients were monitored by a pulmonary artery catheter (PAC) as a part of our routine intraoperative monitoring. SvO<sub> 2</sub> and ScvO<sub> 2 </sub>were simultaneously measured 15 minutes (<em>T</em>1) and 30 minutes (<em>T</em>2) after induction of anesthesia, 15 and 30 minutes after initiation of cardiopulmonary bypass (<em>T</em>3 and <em>T</em>4), and 15 and 30 minutes after admission to intensive care unit (<em>T</em>5 and <em>T</em>6). </span></strong></span><br /><span style="font-family:Arial,Helvetica,sans-serif;color:#000066;"><strong></strong></span><br /><br /><span style="font-family:Arial,Helvetica,sans-serif;color:#000066;"><strong><span style="color:#660000;">Results:</span> </strong></span><br /><br /><ul><li><span style="font-family:Arial,Helvetica,sans-serif;color:#000066;"><strong>ScvO<sub> 2</sub> showed higher reading than SvO<sub> 2</sub> all through our study. </strong></span><br /><li><span style="font-family:Arial,Helvetica,sans-serif;color:#000066;"><strong>Our results showed perfect positive statistically significant correlation between SvO<sub> 2 </sub>and ScvO<sub> 2</sub> at all data points. </strong></span></li></ul><span style="font-family:Arial,Helvetica,sans-serif;color:#000066;"><strong>Individual mean of difference (MOD) between both the readings at study time showed MOD of 1.34 and 1.44 at <em>T</em>1 and <em>T</em>2 simultaneously. This MOD was statistically insignificant, but after on pump beating normothermic bypass was initiated; MOD was 5.2 and 4.4 at <em>T</em>3 and <em>T</em>4 with high statistical significance. In ICU, MOD continues to have high statistical significance, MOD was 6.3 at <em>T</em>5 and at <em>T</em>6 it was 4.6. </strong></span><br /><br /><span style="font-family:Arial,Helvetica,sans-serif;color:#000066;"><strong><span style="color:#660000;">Conclusions</span>: In on pump beating CABG patients; ScvO<sub> 2</sub> and SvO<sub> 2</sub> are not interchangeable numerically. <span style="BACKGROUND-COLOR: #ccffff">ScvO<sub> 2</sub> is useful in the meaning of trend;</span> our data suggest that ScvO<sub> 2</sub> is equivalent to SvO<sub> 2</sub> , only in the course of clinical decisions as long as absolute values are not required.</strong></span><br /><br /><br /><p><span class="sTitle"><a href="http://www.saudija.org/article.asp?issn=1658-354X;year=2010;volume=4;issue=2;spage=63;epage=67;aulast=Alshaer" target="_blank"><span style="font-size:78%;color:#003300;">Mixed venous versus central venous oxygen saturation in patients undergoing on pump beating coronary artery bypass grafting</span></a><span style="font-size:78%;color:#003300;"> - Saudi Journal of Anesthesia - </span></span><span style="font-size:78%;"><span style="color:#003300;"><strong>Year </strong>: 2010 <b>Volume</b> : 4 <b>Issue</b> : 2 <b>Page</b> : 63-67</span></span></p>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-4658320337575194322010-10-10T07:37:00.000-07:002010-10-10T07:37:00.791-07:00<span style="color:#660000;">Q</span>: <em><span style="color:#003333;">34 year old JW (Jehovah's Witnesses) patient is anemic post operatively. Surgeon wants to start erythropoetin or equivalent but patient refuse to have any albumin?</span></em><br /><br /><br /><span style="color:#660000;">Answer:<br /></span><br /><span style="color:#000000;">You may start Aranesp(darbepoetin alfa)'s formulation without albumin. As of January 2007, the albumin-free version of Aranesp (R) is available in the United States. This is Polysorbate80 based version.</span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-6625615498105784592010-10-09T06:32:00.000-07:002010-10-09T06:32:00.173-07:00<span style="color:#660000;">Q:</span> <em><span style="color:#003333;">What is the danger of synchronized cardioversion in the presence of hyperkalemia?<br /></span></em><br /><br /><span style="color:#660000;">Answer:</span><br /><br /><span style="color:#000000;">Cardioversion in "synchronized" form reads the EKG so the shock occurs on an R wave. When you synchronize cardiovert someone, it may take few seconds until the defibrillator senses an R wave and delivers the shock. Sometimes it takes 3 or 4 QRS complexes to do this.<br /><br />If the patient has severe hyperkalemia, sometimes the defibrillator may sense tall, peaked T waves as QRS complexes. If you deliver a cardioversion shock that is sync'd on the T wave, you may induce ventricular fibrillation.</span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-92160127464176452752010-10-08T00:13:00.000-07:002010-10-08T00:13:00.773-07:00<span style="color:#660000;">Q:</span> <em><span style="color:#003333;">What is the easy way to calculate loading dose of Esmolol? (and drip rate)</span></em><br /><br /><br /><span style="color:#660000;">Answer:</span><br /><br /><span style="color:#000000;">Divide patient's body weight in kg by 2<br /> (eg, 70 kg/2 = 35 mg)<br /><br />Multiply loading dose by 0.1 to get the mg/kg/min drip rate<br /> (0.1 X 35 = 3.5 mg)</span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-3328414657800895540.post-60365526066750271852010-10-07T06:51:00.000-07:002010-10-07T06:51:00.483-07:00<span style="color:#660000;">Q:</span><em><span style="color:#003300;"> In Hypothermia induced Ventricular fibrillation which cardiac medicine is preferred and which one may harm the patient?<br /><br /></span></em><br /><span style="color:#660000;">Answer:</span><span style="color:#000000;"> Bretylium (5 mg/kg initially) is recommended for any hypothermic patient manifesting significant new frank dysrhythmia. However, bretylium has a worldwide shortage and may not be available. Relying on Amiodarone or Lidocaine are the next choices.<br /><br />Procainamide may induce more ventricular fibrillation and should be avoided.<br /><br />Defibrillation should also be performed simultaneously. Defibrillate at 2 J/kg (or the biphasic equivalent) if patient remains in ventricular fibrillation or ventricular tachycardia. Success rates of defibrillation are low if the core temperature is less than 32°C and should be performed with rise in body temperature. Actually, because many arrhythmias convert spontaneously upon rewarming, aggressive therapy of minor arrhythmias is not warranted. Transient ventricular arrhythmias should be ignored. This also is true of bradycardia or atrial arrhythmias.<br /><br />The cornerstone of treatment is rewarming the patient</span>Unknownnoreply@blogger.com0