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Title: What's the Diagnosis? Critical Care Edition

Category: Critical Care

Posted: 10/9/2012 by Haney Mallemat, MD

Question

70 year-old male recently treated for community-acquired pneumonia presents with bloody diarrhea, fever, and severe abdominal pain. Abdominal Xray is shown below. Diagnosis?  

Show Answer

Answer: Toxic Megacolon

Toxic megacolon (TM) is an acute colitis with segmental or total colonic dilation (>6cm) plus systemic toxicity.

Actual incidence is unknown, but it is believed that TM is rising because of increasing cases of Clostridium difficile and the aging population. 

The most common etiologies are ulcerative, chron, and pseudomembranous colitis, but other causes exist and can be categorized as:

  • Inflammatory (e.g., ulcerative colitis, Behcet's disease, etc.)
  • Infectious (e.g., Clostridium difficile, Salmonella, Shigella, CMV, etc.)
  • Ischemia  
  • Miscellaneous (chemotherapy, Kaposi sarcoma, etc.)

The diagnosis is made based on clinical evidence of colitis plus evidence of colonic dilation on abdominal XR (diameter > 6cm, loss of haustra, or free intraperitoneal air secondary to perforation) or CT scan (demonstrating dilation or perforation).

Treatment includes:

  • Aggressive fluid resuscitation and vasopressors/inotropes.
  • Broad-spectrum antibiotics
  • NPO, NG tube for bowel decompression, and avoiding medications reducing GI motility (e.g., narcotics)
  • Early surgical evaluation is required although definitive surgical care (including colectomy) may be delayed for up to 3 days while monitoring the response to conservative treatment.

Show References

Autenrieth, D et al. Toxic Megacolon Inflammatory Bowel Dis. 2011 Aug 29. 

Follow me on Twitter (@criticalcarenow) or Google+ (+haney mallemat)



Title: What's the Diagnosis? Image by Dr. Jason Adler

Category: Visual Diagnosis

Posted: 10/8/2012 by Haney Mallemat, MD (Updated: 10/8/2012)

Question

26 year-old male from Indonesia presents with severe abdominal pain and weight loss for the past two months. He also states he found this "worm" in the toilet (see below) after a bowel movement. What is the medical treatment for this condition? 

Show Answer

Answer: Mebendazole or albendazole 

The image above shows an Ascaris Lumbricoides (AL), the most common intestinal roundworm infection in humans. It typically occurs in inhabitants of impoverished areas with poor sanitation. 

Humans acquire AL from ingesting eggs from infected food or soil. Eggs hatch into larvae within the small intestine and then migrate through the mucosa to vascular beds of the alveoli within the lung. Larvae then migrate up the respiratory tree and are swallowed into the GI tract where they mate and more eggs are laid, maturing here or migrating to other organs within the body. 

Most infections are asymptomatic, but signs and symptoms can range from nonspecific pulmonary (first two weeks secondary to larval migration into lungs) to severe (after six weeks secondary to the mechanical effects of high parasite load in the gut). Symptoms include: 

  • Dyspnea, cough, wheezing, fever, etc. (migration of larvae through the lungs)
  • Malnourishment, iron-deficiency anemia, weight loss, GI obstruction, etc. (mechanical effects of a large parasite load)

Treatment during early infection is challenging because AL is non-specific and difficult to diagnose; symptomatic and supportive care is required. When the diagnosis is made, medications such as mebendazole and albendazole can be used to eradicate AL directly within the gut. Situations where worms cause intestinal obstruction, require manual debulking using scopes (e.g., colonoscopy) or surgery.

Show References

Follow me on Twitter (@criticalcarenow) or Google+ (+haney mallemat)



Title: Autoantibody-associated Congenital Heart Block

Category: Cardiology

Keywords: Autoantibody-associated Congenital Heart Block, neonatal lupus, CHB (PubMed Search)

Posted: 10/7/2012 by Semhar Tewelde, MD

Autoantibody-associated congenital heart block (CHB), also know as neonatal lupus, is responsible for the majority (~60-90%) of CHB

This is secondary to maternal antibodies that cross the placenta and may disappear postnatal

Neonatal lupus can result in diffuse myocardial disease both with and without conduction disturbances, structural defects, and electrophysiologic anomalies

Overall mortality is up to 30%, with 15% mortality before 3 months of age

More than 65% of surviving newborns require pacemakers

Maternal screening and fetal echocardiography has allowed routine prenatal diagnosis 

Show References

 

Capone C, Buyon J, Friedman D, Frishman W. Cardiac Manifestations of Neonatal Lupus: A Review of Autoantibody-associated Congenital Heart Block and its Impact in an Adult Population. Cardiology Review. 2012, Mar-Apr;20(2):72-76



Title: Cross-reactivity Between Sulfonamide Antimicrobials and Non-Antimicrobials

Category: Pharmacology & Therapeutics

Keywords: sulfa, allergy, cross-reactivity, antimicrobial, sulfonamide (PubMed Search)

Posted: 10/6/2012 by Bryan Hayes, PharmD (Updated: 10/6/2012)

Patients frequently report having a sulfa allergy. In most cases, the allergic reaction was secondary to a sulfonamide antimicrobial agent, such as sulfamethoxazole-trimethoprim.

The question is: Can I use furosemide (or other non-antimicrobial agents containing a sulfa component)?

  • There is minimal evidence of cross-reactivity between sulfonamide antimicrobials and non-antimicrobials.

  • Despite this, the U.S. FDA-approved product information for many non-antimicrobial sulfonamide drugs contains warnings concerning possible cross-reactions.

Bottom line: If a patient had a true IgE-mediated anaphylatic reaction to a sulfonamide antimicrobial, it may be best to avoid other sulfa-related medications (use ethacrynic acid if a loop diuretic is needed). Otherwise, the available literature does not support cross-reactivity between sulfonamide antimicrobials and non-antimicrobials.

Show References

Strom BL, et al. Absence of cross-reactivity between sulfonamide antibiotics and sulfonamide nonantibiotics. N Engl J Med 2003;349(17):1628-35.

Hemstreet BA, et al. Sulfonamide allergies and outcomes related to use of potentially cross-reactive drugs in hospitalized patients. Pharmacother 2006;26(4):551-7.

Lee AG, et al. Presumed "sulfa allergy" in patients with intracranial hypertension treated with acetazolamide or furosemide: cross-reactivity, myth or reality? Am J Ophthalmol 2004;138(1):114-8.

Johnson KK, et al. Sulfonamide cross-reactivity: fact or fiction? Ann Pharmacother 2005;39(2):290-301.

Follow me on Twitter (@PharmERToxGuy)



Title: Vaccines in children less then 1 year

Category: Pediatrics

Keywords: Vaccines (PubMed Search)

Posted: 10/5/2012 by Jenny Guyther, MD (Updated: 9/17/2026)

We often ask our pediatric patients if there vaccines are up to date, but what does this mean?

Hepatitis B: birth, 2 and 6 months

Diphtheria/Tetanus and Acellular Pertussis: 2, 4 and 6 months

Pneumococcal vaccine: 2, 4 and 6 months

Haemophilus influenzae B : 2, 4 and 6 months

Polio: 2, 4 and 6 months

Rotavirus: 2 and 4 months or 2, 4 and 6 months depending on the brand. 

Influenza: 6 months and older

Children less than 8 years old should receive 2 doses of flu vaccine at least 4 weeks apart during the first flu season that they are immunized.  Children older than 2 years are eligible for the nasal vaccine if they do not have asthma, wheezing in the past 12 months or other medical conditions that predispose them to flu complications.

To see the full vaccine schedule including exact time frames between doses and catch up schedules, see: http://www.cdc.gov/vaccines/schedules/downloads/child/0-6yrs-schedule-pr.pdf

Show References

www.cdc.gov/vaccines



Title: Pharmaceutical Additives - Propylene Glycol

Category: Toxicology

Keywords: propylene glycol, lorazepam, phenytoin (PubMed Search)

Posted: 10/4/2012 by Fermin Barrueto (Updated: 9/17/2026)

Ever have that alcholic who requires lorazapam doses that start to approach 10mg? 20mg? or even higher. The next step is usually a lorazepam infusion and then send them to the ICU. In the ICU,  the patient develops an unexplained anion gap lactic acidosis.

Check a Lactate - lorazepam has 80% propylene glycol (PG). PG is metabolized to lactate which can accumulate when a lorazepam infusion at an elevated dose is running constantly.  Hypotension, bradycardia and even other EKG changes have been reported. Simply discontinue the infusion and assess your acid-base status. 

Other IV meds that contain PG:

lorazepam - 80% PG

Phenytoin - 40% PG

Phenobarbital - 67.8%

Diazepam - 40% PG



Title: Cannabinoid hyperemesis

Category: Toxicology

Keywords: Cannabinoid,hyperemesis, marijauna (PubMed Search)

Posted: 10/4/2012 by Ellen Lemkin, MD, PharmD (Updated: 9/17/2026)

 

  • Is associated with chronic use of marijuana

  • Patients typically present with severe, recurrent nausea, vomiting, and abdominal pain, usually in the morning

  • Temporary relief of symptoms is achieved by taking hot showers or baths

  • Diagnostic work up is negative

Show References

Michael Hiotis PharmD, CSPI. ToxTidbits. Maryland Poison Center Sep 2012



Title: TTP

Category: Critical Care

Posted: 10/2/2012 by Mike Winters, MBA, MD (Updated: 9/17/2026)

Thrombotic Thrombocytopenic Purpura (TTP)

  • TTP is a true hematologic emergency.  As a result of delays in diagnosis and initiation of treatment, mortality remains around 20%.
  • Often, patients present with nonspecific symptoms that include weakness, anorexia, nausea, vomiting, and diarrhea.
  • Recall that the textbook pentad is rarely present upon presentation.  In fact, renal failure and neurologic deficits are late findings.
  • Plasma exchange remains the treatment of choice for critically ill ED patients with TTP.
  • If plasma exchange is not immediately available, consider FFP (15-30 ml/kg) and methylprednisolone (10 mg/kg).

Show References

Kessler CS, et al. Thrombotic thrombocytopenic purpura: A hematological emergency. J Emerg Med 2012; 43:538-44.



Title: A Safer Way to Suture?

Category: Visual Diagnosis

Posted: 10/2/2012 by Haney Mallemat, MD (Updated: 10/2/2012)

Do you place central-lines?

Do you suture your central-lines into place?

Do you ever get worried that you are going to stick yourself with that needle?

If you answered yes to any of these questions, then maybe this pearl is for you; click here

Show References

Follow me on Twitter (@criticalcarenow) or on Google+ (+haney mallemat)



Title: Heyde s Syndrome

Category: Cardiology

Keywords: Heyde s Syndrome, aortic stenosis, angiodysplasia (PubMed Search)

Posted: 9/30/2012 by Semhar Tewelde, MD (Updated: 9/17/2026)

 

Aortic valve (AV) stenosis associated with gastrointestinal angiodysplasia

Proteolysis of Von Willebrand (type 2A) as it passes through the stenotic valve is one culprit of bleeding

Hemostatic abnormalities e.g. GI bleed are often corrected after AV replacement

Valve replacement is only recommended for cardiac symptoms

Show References

 

Vincentelli A, Susen S, et al. Acquired von Willebrand Syndrome in Aortic Stenosis. N Engl J Med 2003; 349:343-349



Title: Fight Bites: Don't let them Bite you back

Category: Orthopedics

Keywords: Fight, bite (PubMed Search)

Posted: 9/29/2012 by Michael Bond, MD

Fight Bites

  • Any abrasion or laceration over the knuckles should be presumed to be a fight bite.  Patients will often lie about the circumstances of the laceration.
  • Radiographs should be obtained on all of these patients to exclude
    • Retained foreign bodies (e.g., tooth fragments)
    • Fracture of the metacarpal head
  • Place patient on amoxicillin/clavulanic acid or clindamycin to cover mouth flora
  • Irrigate wound well, and explore through the fingers full range of motion to exclude joint or tendon injury.
  • Refrain from suturing the wound, as this will increase the risk of infection.
  • Splint in position of function and have them follow up in 2 days.


Title: Syncope in children (contribution by Bethany Radin, DO)

Category: Pediatrics

Keywords: dysrhythmia, arrhythmia (PubMed Search)

Posted: 9/28/2012 by Mimi Lu, MD

The incidence of pediatric syncope is common with 15%-25% of children and adolescents experiencing at least one episode of syncope before adulthood. Incidence peaks between the ages of 15 and 19 years for both sexes.

Although most causes of pediatric syncope are benign, an appropriate evaluation must be performed to exclude rare life-threatening disorders. In contrast to adults, vasodepressor syncope (also known as vasovagal) is the most frequent cause of pediatric syncope (61%–80%).  Cardiac disorders only represent 2% to 6% of pediatric cases but account for 85% of sudden death in children and adolescent athletes.  17% of young athletes with sudden death have a history of syncope.

Key features on history and physical examination for identifying high-risk patients include exercise-related symptoms, a family history of sudden death, a history of cardiac disease, an abnormal cardiac examination, or an abnormal ECG.

Pediatric Dysrhythmias that can cause syncope in children:
- Congenital long QT
- Brugada syndrome
- Catecholaminergic polymorphic VT
- Wolff-Parkinson-White syndrome (WPW)
- Congenital short QT
- Hypertrophic Cardiomyopathy (HCM)
- Arrythmogenic RV dysplasia.
 
 
Reference:
Fischer JW, Cho CS. Pediatric syncope: cases from the emergency department. Emerg Med Clin North Am. 2010 Aug; 28(3):501-16.


Title: Does a cuff-leak mean anything?

Category: Critical Care

Posted: 9/25/2012 by Haney Mallemat, MD

Intubated patients may occasionally meet certain criteria for extubation while in the Emergency Department. Extubation is not without its risk, however, as up to 30% of patients have respiratory distress secondary to laryngeal and upper airway edema, with some patients requiring re-intubation.

Prior to extubation, Intensivists use a brief “cuff-leak” test (deflation of the endotracheal balloon to assess the presence or absence of an air-leak around the tube) to indirectly screen for the presence of upper airway edema and ultimately the risk of re-intubation. The cuff-leak test is performed by deflating the endotracheal balloon followed by one or more of the following maneuvers:

  • Using the ventilator to measure the difference between inspired and expired tidal volumes; if there is a difference in the measured volumes, then air is “leaking” around the endotracheal tube, implying minimal airway edema.
  • Auscultation for an air “leak” around the tube during mechanical ventilation; auscultation of a leak implies that air is passing around the tube and minimal airway edema is present.
  • Disconnecting the patient from the ventilator and occluding the endotracheal tube during spontaneous breathing; auscultation of a leak implies that there is air passing around the tube and minimal airway edema is present.

Ochoa et al. performed a systematic review to determine the accuracy of the “cuff-leak” test to predict upper airway edema prior to extubation. The authors concluded that a positive cuff-leak test (i.e., absence of an air-leak) indicates an elevated risk of upper airway obstruction and re-intubation. A negative cuff-leak test (i.e., presence of an air-leak), however, does not reliably exclude the presence of upper airway edema or the need for subsequent re-intubation.

Bottom line: No test prior to extubation reliably predicts the absence of upper airway edema. Patients extubated in the Emergency Department require close observation with airway equipment located nearby.

 

Show References

Ochoa, ME et al. Cuff-leak test for the diagnosis of upper airway obstruction in adults: A systematic review
and meta-analysis. Intensive Care Med (2009) 35:1171–1179

Follow me on Twitter @criticalcarenow or Google+ (+Haney Mallemat)



Title: Quick trick for guide-wire disposal

Category: Visual Diagnosis

Posted: 9/24/2012 by Haney Mallemat, MD

Guide-wires can be challenging to dispose of after central-line insertion because they are difficult to keep on the field, hard to place in the sharps box, and can splash nearby observers.

Click here for this little guide-wire disposal trick.

Show References

Follow me on Twitter @criticalcarenow or Google+ (+haney mallemat)



Title: Brugada Syndrome

Category: Cardiology

Keywords: Brugada syndrome (PubMed Search)

Posted: 9/23/2012 by Semhar Tewelde, MD

 

Autosomal dominant inherited arrhythmic disorder characterized by mutation in sodium-channels
Arrhythmic events are often observed at rest or while asleep, resulting in VF and SCD
Diagnostic criteria consists of 2 parts: (1) ECG abnormalities (2) clinical characteristics
A. ECG abnormalities: incomplete or complete RBBB in right precordial leads (V1-V2) w/
    Type I coved-type ST segment elevation and negative T wave 
    Type II saddle-back ST segment elevation followed by a positive or biphasic T wave 
    Type III ST segment elevation without meeting criteria for type I or II variants
B. Clinical characteristics: hx of VT/ VF, family hx of SCD or abnormal ECG, agonal respirations during sleep, or inducible VT/VF during EP study

Show References

Mizusawa Y, Wilde A. Brugada Syndrome. Circ Arrhythm Electrophysiol. 2012;5:606-616.



Title: SLAP lesions

Category: Orthopedics

Keywords: Shoulder, biceps, cartilage tear (PubMed Search)

Posted: 9/22/2012 by Brian Corwell, MD (Updated: 11/19/2013)

SLAP tear/lesion – Superior labral tear anterior to posterior

Glenoid labrum – A rim of fibrocartilaginous tissue surrounding the glenoid rim, deepening the “socket” joint and is integral to shoulder stability

http://www.orthospecmd.com/images/shoulder_labral_tear_anat_02.jpg

Injury is most commonly seen in overhead throwing athletes

Or from a fall on the outstretched hand, a direct shoulder blow or a sudden pull to the shoulder

Sx’s:  A dull throbbing pain, a “catching” feeling w/ activity. Some describe clicking or locking of the shoulder. May also include nighttime symptoms. Pain is located to the anterior, superior portion of the shoulder.

Athletes may describe a significant decrease in throwing velocity

http://sitemaker.umich.edu/fm_musculoskeletal_shoulder/o_brien_s_test



Title: Pediatric intubation (submitted by Danya Khoujah, MBBS)

Category: Pediatrics

Keywords: premedication, RSI, ventilator, high flow nasal cannula (PubMed Search)

Posted: 9/21/2012 by Mimi Lu, MD

When intubating an infant, a few key points need to be kept in mind:
- Remember that the narrowest point is the cricoid, so even if the ETT passes the cords it might still not pass through the cricoid itself.
- Remember premedication with atropine is recommended in all children less that 1 year old and in those less than 5 years old when using succinylcholine. It is used to prevent reflex bradycardia and high ICP and to decrease secretions. The dose is 0.02 mg/kg IV, with a minimum of 0.1 mg and a max of 0.5 mg. Give it 2 full minutes before the start of intubation.
- Remember that succinylcholine is contraindicated in neuromuscular disease (including an undiagnosed myopathy). A slightly higher dose (2mg/kg) may need to be used in infants (compared to 1-1.5mg/kg in adults and older children).  
- Pressure control mode is preferred over volume control (VC) setting in peds, because VC tends to overestimate how much volume it's delivering, therefore delivering inadequate ventilation.
- Remember your alternatives: High Flow Nasal cannula (HFNC) can be used in infants with respiratory distress to avoid intbation. One study showed that is decreased intubation rates by 68% in respiratory distress due to bronchiolitis
 
References:
1. Santillanes G, Gausche-Hill M. Pediatric Airway Management. Emerg Med Clin N Am 26 (2008) 961–975
2. Bledsoe G H, Schexnayder S M. Pediatric Rapid Sequence Intubation A Review. Ped Emerg Care 20 (2004) 339-344


Title: Organic Food - is that really the way to go?

Category: Toxicology

Keywords: arsenic, rice (PubMed Search)

Posted: 9/20/2012 by Fermin Barrueto

Just when you think buying organic protects you from chemicals and pesticide, along comes the studies detecting arsenic in rice products and specficially in organic foods with brown rice organic sweetener. An organic toddler milk formula reportedly had 6x EPA standards for safe drinking water limit.

The more toxic arsenic is the inorganic arsenic which can cause neuropathy but after chronic exposure can cause a classic arsenic keratosis - see attached pic. The inorganic is seen commonly in seafood and is more easily excreted by the body. Unfortunately, in the study referenced here, inorganic As was the predominant type.

 

 

 

Show References

 

Arsenic, organic foods, and brown rice syrup.

Jackson BP, Taylor VF, Karagas MR, Punshon T, Cottingham KL.

Environ Health Perspect. 2012 May;120(5):623-6. Epub 2012 Feb 13.

 

Attachments

  • 1209202121_arsenickeratosis.jpg (129 Kb)


Title: Lung Transplant Pt.

Category: Critical Care

Posted: 9/18/2012 by Mike Winters, MBA, MD

The Lung Transplant Patient in Your ED

  • The number of lung transplant recipients is increasing.  With improved immunosuppressant medications, pts are living longer.  In fact, the 5-yr survival rate is now approximately 60%.
  • When evaluating a lung transplant pt who is < 1 yr following transplant, think about acute rejection and infection
  • Acute rejection occurs in up to 40% of pts, can present with cough, SOB, malaise, or hypoxia, and is treated with high-dose corticosteroids.
  • Infection
    • Bacterial infections usually occur in the early stages following transplant, with Pseudomonas the predominant organism
    • CMV is the most common organism affecting up to 33% of pts during the first year after transplant

Show References

Fuehner T, et al. The lung transplant patient in the ICU. Curr Opin Crit Care 2012; 18:472-8.



Title: What's the Diagnosis? Written by Zachary Dezman

Category: Visual Diagnosis

Posted: 9/17/2012 by Haney Mallemat, MD

Question

27 year-old woman with AIDS presents complaining of a painful, puritic, and papular rash. What's the diagnosis?

Show Answer

Answer: Herpes zoster ophthalmicus

Herpes Zoster Ophthalmicus

  • Zoster involving the ophthalmic branch (V1) of the trigeminal nerve
  • Concomitant nasal rash is called Hutchinson's sign and heralds involvement of the eye (specifically the cornea); the nasociliary nerve innervates both the nose and eye
  • Must perform a thorough evaluation of the eye including slit lamp and fluorescein
  • Consider admission if:
    • symptoms are severe 
    • 2 or more dermatomes are involved
    • patients are immunocomprosmised
  • ​Treatment is with ​acyclovir, valacyclovir, or famciclovir

Show References

Follow me on Twitter (@criticalcarenow) or on Google+ (+haney mallemat) 



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