Monday, October 31, 2011



 







Hematemesis

Hemoptysis


  • Dark red or brown
  • In clumps
  • Mixed with food
  • Acidic pH
  • Abdominal discomfort
  • Nausea, retching before and after episode

    • Bright red
    • Foamy, runny
    • Mixed with mucous
    • Alkaline pH
    • Chest pain,
    • warmth or gurgling over the chest
    • Persistent cough

    Sunday, October 30, 2011

    A note on Ambien and GERD association!

    Zolpidem (Ambien) dramatically increases the new event and duration of gastroesophageal reflux (GERD)., Patients with established diagnosis of GERD had reflux events measured to be significantly longer when taking zolpidem than on placebo.

    Proposed mechansim of action: This is assumed to be due to suppression of arousal during the reflux event, which would normally result in a swallowing reflex to clear gastric acid from the esophagus.

    Long term effect includes development of  esophageal cancer.


    Reference: Gagliardi GS, Shah AP, Goldstein M, Denua-Rivera S, Doghramji K, Cohen S, Dimarino AJ (September 2009). "Effect of zolpidem on the sleep arousal response to nocturnal esophageal acid exposure". Clin. Gastroenterol. Hepatol. 7 (9): 948–52.

    Saturday, October 29, 2011

    IV Benadryl as local anesthetic - interesting case report and discussion

    Reference:  J Clin Aesthetic Dermatol. 2009;2(10):37–40.

    Diphenhydramine hydrochloride (DPH) has numerous pharmacological uses in medicine. It is a first-generation, sedating, oral antihistamine. When topically applied, DPH has excellent anesthetic and antipruritic effects. DPH has also been shown to be an effective injectable drug for local anesthesia. This may be due to its three-dimensional structure, which is similar to other anesthetic drugs. The authors present a patient whose history of a severe “allergic” reaction to a “caine” local anesthetic prompted the use of 1% DPH to allow same-day surgery and avoid any possibility of a potentially life-threatening reaction."

    Read full article here

    Thursday, October 27, 2011

    Q: What is Sepsis 6?

    The sepsis six is following intervention in one hour

    1. Deliver high-flow oxygen.
    2. Take blood cultures.
    3. Administer empiric intravenous antibiotics.
    4. Measure serum lactate and send full blood count.
    5. Start intravenous fluid resuscitation.
    6. Commence accurate urine output measurement.
    Five years after the international Surviving Sepsis Campaign (SSC) care bundles were published, care standards in the management of patients with severe sepsis are achieved in fewer than one in seven patients! Application of sepsis six along with SSC resuscitation bundle showed remarkable improvement.

    Study data from 567 patients showed that 84.6% of those receiving the sepsis six (n=220) achieved the resuscitation bundle compared with only 5.8% of others!

    Tuesday, October 25, 2011

    Q: What is Talcosis?




    A: Talcosis refers to emboli of talc, starch, and cellulose, and are seen almost invariably in chronic intravenous drug users. When injected, talc produces a giant cell granulomatosis of the pulmonary arterioles, thats why also known as Talc granulomatosis.


    Some of the oral medications such as amphetamines, methylphenidate, hydromorphone, and dextropropoxyphene are ground by drug users, mixed in liquid, and injected IV. Talc (as magnesium trisilicate), starch, and cellulose, are used as fillers in these drug and causes Talcosis. Talc and other particles reach small pulmonary arterioles and capillaries where a foreign body giant cell granulomatous reaction occurs. Chronic use causes Pulmonary hypertension and right heart failure.

    Monday, October 24, 2011

    Q: Propofol should be given with caution in which common allergy?


    A: Egg allergy

    Originally propofol was launched 32 years ago but was withdrawn from the market due to reports of anaphylactic reactions. It was re-launched in 1986 by AstraZeneca with the brand name Diprivan with preparation containing 10% soybean oil and 1.2% purified egg lecithin, a phosphatidylcholine found in egg yolk.

    A history of egg allergy does not necessarily contraindicate the use of propofol. Most egg allergies are related to a reaction to the egg white (albumin) and not to the egg yolk (lecithin). This could explain why 'propofol' is only very rarely a problem. However, a patient who has an egg allergy should be carefully questioned.

    Sunday, October 23, 2011

    Q: 32 year old female with 12 weeks of pregnancy presented with right lower quadrant pain with rebound tenderness. There is a huge clinical suspicion of Acute appendicitis. What should be the management approach beside starting full coverage antibiotics?



    Answer:  According to the 2010 Society of American Gastrointestinal and Endoscopic Surgeons (SAGES) guideline, laparoscopic appendectomy is suitable in suspected appendicitis in pregnant women. Overall, The SAGES guideline states that the laparoscopic approach should be preferred in women of childbearing age with presumed appendicitis.

    Diagnostic laparoscopy can be performed only to confirm the diagnosis of appendicitis. If findings are positive, definitive surgical treatment should be performed. Perforation may increase the fetal and maternal morbidity. Therefore, aggressive management of the appendix is warranted in pregnant patients.

    Advantages of laparoscopic appendectomy include increased cosmetic satisfaction, a decrease in the postoperative wound-infection rate, shortens hospital stay and convalescent period compared with open appendectomy. Disadvantages of laparoscopic appendectomy are increased cost and an operating time approximately 20 minutes longer than that of an open appendectomy.

    Saturday, October 22, 2011

    Q: 62 year old male with history of Acute Intermittent Porphyria (AIP) presented to ER with chest pain. While awaiting to go to cardiac cath. patient went  into ventricular fibrillation. Which one antiarrhythmic medicine is contra-indicated or at least should be given with extreme caution?



    Answer: Lidocaine

    Contraindications for the use of lidocaine include history of Porphyria, especially acute porphyria. Lidocaine is known to be porphyrogenic.

    Friday, October 21, 2011

    Q: Ventricular fibrillation caused by Digitalis toxicity is best responsive to(Choose one)?

    A) cardioversion
    B) Amiodarone
    C) Lidocaine
    D) Digibind


    Answer: Lidocaine

    Interestingly, electrical cardioversion is generally not indicated in ventricular fibrillation caused by digitalis toxicity. On the contrary it is found to increase the dysrhythmia in digitalis toxicity. Similarly, is the case with amiodarone. Lidocaine is a better choice in known ventricular fibrillation caused by digitalis toxicity.

    Digibind is an antidote for Digitalis but not an antiarrhythmic agent.

    Thursday, October 20, 2011

    Q: 52 year old male with ESRD presented to hospital with Respiratory failure and hypotension. Patient was intubated in field. In ER patient found to have complete heart block. ER physician emergently inserted intravenous pacemaker which stabalizes hemodynamics. On clinical exam, patient is unresponsive and have lost of reflexes. Labs showed abnormalities but most pronounced was Magnesium level of 17.0 mEq/L. You gave intravenous calcium. What should be the next step?



    Answer: Emergent Dialysis

    Magnesium has fairly good therapeutic margin but hypermagnesemia is a risk in some patients particularly Renal failure. Mild hypermagnesemia may cause weakness, nausea, vomiting and mild hypotension but progressively it can become life threatening. Following is the ballpark clinical signs/symptoms depending on magnesium level.

    • 4.0 mEq/L hyporeflexia
    • 5.0 mEq/L Prolonged atrioventricular conduction
    • 7.0-10.0 mEq/L - loss of patellar reflex
    • 10.0-13.0 mEq/L - respiratory depression and various heart block
    • Above 13.0 mEq/L - cardiac arrest/Asystole.
    Mainstay of treatment is withdrawing magnesium supplementation, Intravenous calcium, diuretics and in severe cases dialysis.

    Wednesday, October 19, 2011

    Q: Which anti-seizure medicine could be an adjuvant treatment in Central DI (Diabetes Insipidus)?


    Answer: Carbamazepine

    Primary treatment for Central DI is desmopressin. Carbamazepine, an anti-convulsive medication, has also shown some postive effect in this type of DI. Though the data is old but it is still a valid option, if required 1. It can also be used in gestational DI.


    Related posts:

    Hydrochlorothiazide in Diabetes Insipidus

    Gestational diabetes insipidus





    1. Wales JK.,  Treatment of diabetes insipidus with carbamazepine. Lancet. 1975 Nov 15;2(7942):948-51.

    Tuesday, October 18, 2011

    A quote from history on discovery of cryoprecipitate

    Cryoprecipitated is the cold-insoluble portion of plasma that precipitates when FFP has been thawed between 1-6C. It is extremely rich in fibrinogen and factor VIII. It also contains von Willebrand factor (vWF) and factor XIII.

    "I made a mistake in an experiment, and instead of putting frozen plasma back in the freezer at the end of the day's experiment, I instead stuck it in the refrigerator. When I came in the next morning, there was all this junk in the bottom of the tube which I spun out, and I used the plasma for my experiment. My experiment didn't work because there was no Factor VIII in it. And I went back and fished the junk out of the trash and assayed the junk and got these outrageously high values for Factor VIII in the junk, and neither Charlie nor I believed it, and so it was one of those things. And sure enough, about a year later Judith Graham Pool discovered cryoprecipitate". 1


    1. Reference: Resnik, Susan (1999). Blood Saga: Hemophilia, AIDS, and the Survival of a Community. Berkeley: University of California Press. pp. 40–41

    Monday, October 17, 2011

    On Pradaxa (dabigatran)


    Dabigatran (Pradaxa) is an direct thrombin inhibitors oral anticoagulant. It is an alternative to warfarin. It has huge advantage as it does not require frequent blood tests for INR monitoring. Half life of Dabigatran is 12-17 hours. In event of bleeding, f extreme aggressive treatment is needed, Dabigatran is dialyzable.

    Sunday, October 16, 2011

    Early Tracheostomy in Trauma patients?

    Background:  The influence of tracheostomy timing on outcome after severe head injury remains controversial.

    Methods: The investigation was based on data prospectively collected by the Pennsylvania Trauma Society Foundation statewide trauma registry from January 1990 until December 2005.

    Results: 3,104 patients met criteria for inclusion in the study (GCS less than/= 8 and tracheostomy). Early Tracheostomy Group (ETG) patients, defined as tracheostomy performed during hospital days 1–7, were more likely to be functionally independent at discharge (adjusted odds ratio (OR) 1.45, 95% confidence interval (CI), 1.16–1.82, P = 0.001) and have a shorter length of stay (adjusted OR 0.23, 95% CI, 0.20–0.28, P less than 0.0001). However, Late Tracheostomy Group (LTG) patients, defined as tracheostomy performed  more than 7 days after admission, were approximately twice as likely to be discharged alive (adjusted OR 2.12, 95% CI, 1.60–2.82, P less than 0.0001). Using a Composite Outcome Scale, which combined these three measures, there was a non-significant trend toward a higher likelihood of a poor outcome in LTG patients. When this analysis was repeated using only those patients in relatively good condition on admission, LTG patients were found to be approximately 50% less likely to have a good outcome (adjusted OR 0.46, 95% CI, 0.28–0.73, P = 0.001) when compared to ETG patients.

    Conclusions: These results indicate a complex relationship between tracheostomy timing and outcome, but suggest that a strategy of early tracheostomy, particularly when performed on patients with a reasonable chance of survival, results in a better overall clinical outcome than when the tracheostomy is performed in a delayed manner.

    Impact of Tracheostomy Timing on Outcome After Severe Head Injury  - Neurocritical Care, DOI: 10.1007/s12028-011-9615-7 (online first)

    Saturday, October 15, 2011

    Q: Give 5 causes of "Nontraumatic" Chylothorax?

    Answer: L-CATS

    Lymphoma
    Cirrhosis,
    Amyloidosis
    Tuberculosis,
    Sarcoidosis

    Thursday, October 13, 2011

    Role of rTPA in Frostbite!



    Thrombolytic therapy will decrease the incidence of amputation when administered within 24 hours of exposure. One study published in 2007 from University of Utah, Salt Lake City 1. 32 patients with (frostbite) digital involvement (hands, 19%; feet, 62%; both, 19%) were identified. Seven patients received tPA, 6 within 24 hours of injury. The incidence of digital amputation in patients who did not receive tPA was 41%. In those patients who received tPA within 24 hours of injury, the incidence of amputation was reduced to 10%. Authors concluded that Tissue plasminogen activator improved tissue perfusion and reduced amputations when administered within 24 hours of injury.


    1. Reduction of the Incidence of Amputation in Frostbite Injury With Thrombolytic Therapy - Arch Surg. 2007;142:546-553.

    Wednesday, October 12, 2011

    On Therapeutic Hypercapnia (HCA = Hypercapnic Acidosis)
    Interesting line from the following reference article - A very informative read
    "In experimental polymicrobial sepsis in female sheep, HCA improved tissue oxygenation and reduced lung edema formation more than dobutamine administration"1
    Bench-to-bedside review: Carbon dioxide - Gerard Curley, John G Laffey and Brian P Kavanagh - Critical Care 2010, 14:220 (click to read the article)
    1. Wang Z, Su F, Bruhn A, Yang X, Vincent JL: Acute hypercapnia improves indices of tissue oxygenation more than dobutamine in septic shock.  - Am J Respir Crit Care Med 2008, 177:178-183

    Tuesday, October 11, 2011

    Picture Diagnosis



    Answer: Moyamoya


    Moyamoya disease is a progressive cerebrovascular disease in certain arteries in the brain are constricted causing stroke. The name “moyamoya” means “puff of smoke” in Japanese. See the appearance above of Angiogram.

    Monday, October 10, 2011

    Q: Which lab is most reliable in following the effect of plasmapheresis in resolution of TTP (Thrombotic thrombocytopenic purpura)?


    Ans: LDH

    Declining LDH level is a pretty good indicator that plasma exchange is working to treat TTP.

    Sunday, October 9, 2011

    Q: What is the recommended dose of Solu-Medrol in DIFFUSE ALVEOLAR HEMORRHAGE?


    Answer: 500 mg every 6 hours

    Corticosteroids and immunosuppressive agents are the gold standard for this disease. Factor VII has recently shown promising results.

    Recommended dose of intravenous methylprednisolone (Solu-Medrol) is up to 500 mg every 6 hours for 5 days, followed by a taper to a maintenance dose. Though higher and lower doses have been described too.

    Also, Plasmapheresis and intravenous immunoglobulin therapy should be considered too in cases related to vasculitis.

    Saturday, October 8, 2011

    Airway evaluation - LEMON Rule

    Friday, October 7, 2011

    Q; Is Digoxin a diuretic?


    A: Yes it has direct diuretic property! Digoxin increases diuresis by at least 4 mechanisms
    • Direct vasodilation
    • Increased CO improves renal hemodynamics
    • Inhibition of tubular reabsorption of sodium, of renal Na+ -K+-ATPase, and of concentrating and diluting ability
    • Increased secretion of atrial natriuretic peptide
    Reference:

    1. Rahimtoola SH, Tak T. The use of digitalis in heart failure. Curr Probl Cardiol. 1996; 21: 781–756

    Thursday, October 6, 2011

    Q: What is postictal bliss?


    Answer: Postictal bliss (PB) is a highly blissful feeling associated with amnesia following seizures.

    Symptoms of his own post-ictal bliss is best described by famous Russian author Fyodor Dostoevsky (1821-1881) as: "For several instants I experience a happiness that is impossible in an ordinary state, and of which other people have no conception.  I feel full harmony in myself and in the whole world, and the feeling is so strong and sweet that for a few seconds of such bliss one could give up ten years of life, perhaps all of life. I felt that heaven descended to earth and swallowed me.  I really attained god and was imbued with him.  All of you healthy people don't even suspect  what happiness is , that happiness that we epileptics experience for a second before an attack."1


    1. From charge.org.uk

    Wednesday, October 5, 2011

    Half dose Succinylcholine?


    BACKGROUND: The authors reappraised the conventional wisdom that the intubating dose of succinylcholine must be 1.0 mg/kg and attempted to define the lower range of succinylcholine doses that provide acceptable intubation conditions in 95% of patients within 60 s.

    METHODS:  This prospective, randomized, double-blind study involved 200 patients. Anesthesia was induced with 2 mug/kg fentanyl and 2 mg/kg propofol. After loss of consciousness, patients were randomly allocated to receive 0.3, 0.5, or 1.0 mg/kg succinylcholine or saline (control group). Tracheal intubation was performed 60 s later. A blinded investigator performed all laryngoscopies and also graded intubating conditions.

    RESULTS: Intubating conditions were acceptable (excellent plus good grade combined) in 30%, 92%, 94%, and 98% of patients after 0.0, 0.3, 0.5, and 1.0 mg/kg succinylcholine, respectively. The incidence of acceptable intubating conditions was significantly greater (P  less than 0.05) in patients receiving succinylcholine compared with those in the control group but was not different among the different succinylcholine dose groups. The calculated doses of succinylcholine (and their 95% confidence intervals) that were required to achieve acceptable intubating conditions in 90% and 95% of patients at 60 s were 0.24 (0.19-0.31) mg/kg and 0.56 (0.43-0.73) mg/kg, respectively.

    CONCLUSIONS:  The use of 1.0 mg/kg of succinylcholine may be excessive if the goal is to achieve acceptable intubating conditions within 60 s. Comparable intubating conditions were achieved after 0.3, 0.5, or 1.0 mg/kg succinylcholine. In a rapid-sequence induction, 95% of patients with normal airway anatomy anesthetized with 2 mug/kg fentanyl and 2 mg/kg propofol should have acceptable intubating conditions at 60 s after 0.56 mg/kg succinylcholine. Reducing the dose of succinylcholine should allow a more rapid return of spontaneous respiration and airway reflexes.


    Optimal dose of succinylcholine revisited., Anesthesiology. 2003 Nov;99(5):1045-9.

    Tuesday, October 4, 2011

    Q: After inserting central venous catheter, you have hard time (resistance) to flush the distal lumen; Also you have poor venous backflow from the distal lumen; What should be your first thought?


    Answer: Lost guide wire


    The first thing before you cannot find guide wire or find it on CXR, would be a resistance to injection via the distal lumen and  poor venous backflow from the distal lumen.

    Lost guidewire during CVC insertion is a very under-appreciated complication and happens more frequently than thought.

    Loss of the guide wire: mishap or blunder? - Br. J. Anaesth. (2002) 88 (1): 144-146.

    Monday, October 3, 2011

    Q: Half life of Cisatracurium (Nimbex) is prolong in?


    A) Hepatic failure
    B) Renal failure
    C) Geriatric patients
    D) Hypothermia
    E) Both C and D




    Answer: E (Both C and D)


    Half life of Nimbex is approximately 22 to 29 minutes, following administration of a single intravenous dose. The half-life is not substantially affected by the duration of administration (approximately 26 ± 11 minutes in ICU patients receiving cisatracurium via intravenous infusion), type of anesthesia, or hepatic or renal function impairment, but is slightly longer in geriatric patients than in younger adults. In individuals undergoing induced hypothermia (body temperature of 25 to 28 °C), the half-life is prolonged as compared with the half-life during normothermia.

    Sunday, October 2, 2011

    Mnemonic to remember the causes of the oxygen dissociation curve to Right!
    CADET 
    • CO2,
    • Acid,
    • 2,3-DPG,
    • Exercise and
    • Temperature