UMEM Educational Pearls

Title: Driving after concussion: Is it safe to drive after symptoms resolve?

Category: Neurology

Keywords: concussion, driving performance, cognitive impairment (PubMed Search)

Posted: 1/11/2017 by WanTsu Wendy Chang, MD
Click here to contact WanTsu Wendy Chang, MD

 
Driving after concussion: Is it safe to drive after symptoms resolve?
  • Limited data is available to guide when individuals should return to driving after a concussion.
  • Cognitive impairments in reaction time, executive function, and attention can persist even after symptoms of a concussion resolve.
  • Schmidt et al. compared driving performance between individuals within 48 hours following symptom resolution after a concussion with matched controls using simulated driving.
  • They found that concussed individuals had poorer driving performance despite being asymptomatic.
  • This study is limited by a small sample size (n=28), however, it raises interesting questions regarding whether driving should be restricted following concussions and how should readiness to return to driving be determined.

 

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--Recent meta-analysis comparing continuous infusion versus intermittent bolus dosing of beta-lactam antibiotics demonstrates mortality benefit (NNT = 15) in patients with severe sepsis or septic shock. (1)

--Consider beta-lactam continuous infusion on your septic patients if your hospital pharmacy allows

[Thanks to Anne Weichold, CRNP for providing the article for this pearl!]

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Question

A 60 year-old man with history of atrial fibrillation, CAD presents with left lower leg/foot pain for a few days. His foot is seen below. What's the diagnosis?

 

 

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Title: Ketorolac's analgesic ceiling

Category: Pharmacology & Therapeutics

Keywords: ketorolac, NSAID, analgesia (PubMed Search)

Posted: 1/7/2017 by Michelle Hines, PharmD (Updated: 11/27/2024)
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In a study comparing ketorolac IV doses of 10 mg, 15 mg, and 30 mg, no difference in pain score reduction or need for rescue analgesia was observed.

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Title: Unexplained Lactic Acidosis, a clue to poisoning

Category: Toxicology

Keywords: Lactic acidosis (PubMed Search)

Posted: 1/5/2017 by Kathy Prybys, MD (Updated: 1/6/2017)
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Lactic acidosis is the most common cause of anion gap metabolic acidosis in all hospitalized patients. An elevated lactate level is an important marker of inadequate tissue perfusion causing subsequent shift to anaerobic metabolism and occuring in a variety of disease states such as sepsis. In patients with unexplained lactic acidosis without systemic hyoperfusion or seizure suspect  the following toxins:

  • Acetaminophen: Early on in massive ingestion usually associated with coma.
  • Cyanide
  • Metformin
  • HIV Drugs: Nucleotide reverse transcriptase inhibitors = Didanosine, stavudine, zidovudine due to mitochondrial toxicity.
  • Ethylene Glycol: Spuriously elevated lactate may occur with ethylene glycol toxicity due to the structural similarity between glycolic acid and lactate.Check for osmolar gap.
  • Kombucha ``mushroom'' tea 
 

 

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Title: Vitamin B12 Deficiency: Part 2

Category: International EM

Keywords: B12 deficiency, ataxia, dementia, pernicious anemia (PubMed Search)

Posted: 1/4/2017 by Jon Mark Hirshon, PhD, MPH, MD
Click here to contact Jon Mark Hirshon, PhD, MPH, MD

Vitamin B12 deficiency can cause significant disease, including severe neurologic problems. However, patient presentations can vary greatly.

Signs and symptoms can include:

  • Constitutional symptoms: fatigue, lack of energy, lightheadedness, loss of appetite
  • Gastrointestinal problems: diarrhea or constipation
  • Cardiovascular: shortness of breath, dyspnea on exertion, tachycardia, CHF
  • Oral lesions: swollen, red tongue (glossitis) or bleeding gums
  • Problems concentrating

Prolonged B12 deficiency can lead to significant neurologic complications, frequently related to the spinal cord, and can include:

  • Mild impairment to dementia
  • Depression, psychosis
  • Loss of balance, limb weakness, ataxia
  • Peripheral neuropathy (numbness and tingling of hands and feet)


PaCO2 and the Post-Arrest Patient

  • Alterations in PaCO2 are common during the post-arrest period and have been associated with worse patient centered outcomes.
  • Hypercarbia can dilate cerebral vessels, increase cerebral blood flow, and may increase intracranial pressure.
  • Conversely, hypocarbia can constrict cerebral vessels and may reduce cerebral blood flow.
  • Though the current evidence is primarily limited to observational trials, a recent meta-analysis found that "normocarbia" was associated with improved hospital survival and neurologic outcome. 
  • Take Home: Adjust mechanical ventilation to target normocarbia (PaCO2 or ETCO2) in the post-arrest patient.

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Question

A 36-year-old male, who recently immigrated from Africa, presented to the ED with fever, rash, cough and shortness of breath. He was noted to be febrile to 39.0 C. The rash is disseminated but present mainly in his trunk as shown in the picture. 

 

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Take Home Point:

  • According to a recent article in the NEJM there does not seem to be any difference in the rate of symptomatic venous thromboembolism (VTE) in patients given low molecular weight heparin that underwent arthorscopy or had lower leg casting at 3 months.  
  • Overall, the rates of VTE were really low ( casting: 1.4% vs. 1.8%; arthroscopy: 0.7% vs. 0.4%), so there is probably not need for prophalaxis in these patients. 

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In pediatrics, providers typically prescribe 10 mg/kg (max 500 mg) and 5 mg/kg daily x 4 (max 250 mg) for treatment of pneumonia, but this dosing regimen is NOT recommended for all azithromycin usage. There are other dosing regimens that are important to keep in mind during the respiratory season:

1) Pharyngitis/ tonsillitis (ages 2-15 yr): 12 mg/kg daily x 5 days (max 500 mg/ 24 hr)

2) Pertussis

3) Acute sinusitis >/= 6 months: 10 mg/kg daily x 3 days

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Smoke inhalation victims (house fires) are at risk of carbon monoxide (CO) and cyanide poisoning (CN). CO exposure/poisoning can be readily evaluated by CO - Oximetry but CN level can be obtained in majority of the hospital.

Lactic acid level is often sent to evaluate for CN poisoning.

 

Bottom line:

  1. Lactatic acid levels should be sent in all smoke inhalation victims.
  2. Elevate lactate > 10 mmol/L is highly suggestive of CN poisoning
    .

 

 

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Title: Bolus Dose Nitrates in Acute Pulmonary Edema

Category: Critical Care

Keywords: Acute pulmonary edema, Bolus nitrates (PubMed Search)

Posted: 12/27/2016 by Rory Spiegel, MD (Updated: 11/27/2024)
Click here to contact Rory Spiegel, MD

It is well known that the early aggressive utilization of IV nitrates and non-invasive positive pressure ventilation (NIV) in patients presenting with acute pulmonary edema will decrease the number of patients requiring endotracheal intubation and mechanical ventilation. 

Often our tepid dosing of nitroglycerine is to blame for treatment failure. Multiple studies have demonstrated the advantages of bolus dose nitroglycerine in the early management of patients with acute pulmonary edema. In these cohorts, patients bolused with impressively high doses of IV nitrates every 5 minutes, are intuabted less frequently than patients who received a standard infusion (1,2). No concerning drops in blood pressure in the patients who received bolus doses of nitrates were observed. Using the standard 200 micrograms/ml nitroglycerine concentration, blood pressure can be rapidly titrated to effect.

 

 

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Question

68 year-old male presents with 3-4 days of hedache, anorexia for 2 weeks and "balance trouble." His blood pressure was 226/140 and he states he has not been on his medications for 6 months.
Physical examination revealed a shuffled gait with his walker and the rest of his physical exam and neurologic exam was unremarkable. 
 
His CT is seen below. What's the diagnosis?
 
 
 
 

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Title: Concussions injure more than your head

Category: Orthopedics

Keywords: Concussions, musculoskeletal injury (PubMed Search)

Posted: 12/24/2016 by Brian Corwell, MD
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Concussions are associated with an elevated risk of musculoskeletal injury

 

Significant associations were found between concussion and

Lateral ankle sprain (P = 0.012)

Knee injury (P = 0.002)

Lower extremity muscle injury (P = 0.031)

Keep in mind that 50 – 80% of concussions may go undiagnosed or unreported.

A discussion about risks of early return after concussion should include mention of risks beyond repeat head injury/2nd impact syndrome

Study limits: Retrospective design limits ability to establish causation/reporting bias

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Vitamin B12 deficiency, including pernicious anemia, is typically seen in malnourished individuals. Globally, it is widespread in those who live in poverty.

In the U.S., we often consider it in individuals who are chronic alcoholics. However, it can be seen in others, including:

  • Bariatric patients after certain weight-loss surgeries
  • Conditions causing problems with food digestion, including Crohn’s disease, celiac disease, or fish tapeworm (Diphyllobothrium latum) infection
  • Individuals on certain medications for a prolonged time, including proton pump inhibitors, histamine 2 receptor blockers and metformin
  • Inadequate dietary intake or genetic intrinsic factor deficiency


Title: Reversal of Vitamin K Antagonists in Intracranial Hemorrhage

Category: Critical Care

Keywords: Intracranial hemorrhage, ICH, PCC, FFP, vitamin K antagonist, VKA, coumadin, warfarin (PubMed Search)

Posted: 12/20/2016 by Daniel Haase, MD (Updated: 2/18/2017)
Click here to contact Daniel Haase, MD

The Neurocritical Care Society and Society of Critical Care Medicine just came out with new Guidelines for Reversal of Antithrombotics in Intracranial Hemorrhage (ICH) [1]

--PCC is now recommended over FFP in reversal of vitamin K antagonists (VKA) with elevated INR. Either should be co-administered with 10mg IV vitamin K. (Strong recommendation, moderate quality evidence)

TAKE AWAY: PCC should be probably be given over FFP in VKA-ICH when available

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Title: Cellulitis--Does your patient really have it?

Category: Infectious Disease

Keywords: cellulitis (PubMed Search)

Posted: 12/15/2016 by Michael Bond, MD (Updated: 12/17/2016)
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Take home points:

  1. Cellulitis is overdiagnosed
  2. 1/3 of patients diagnosed with cellulitis in the ED are ultimately given a different diagnosis
  3. The most common final diagnoses are vascular or inflammatory conditions.
  4. The over treatment of cellulitis increases healthcare costs, increases risk of adverse reactions, and can contribute to the development of drug resistant organisms.

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Title: Do older infants with fever and diarrhea need a UA and culture?

Category: Pediatrics

Keywords: fever, diarrhea, urinary tract infection (PubMed Search)

Posted: 12/16/2016 by Jenny Guyther, MD (Updated: 11/27/2024)
Click here to contact Jenny Guyther, MD

After 4 months old, the answer MAY be no.

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Title: Acetaminophen induced liver failure

Category: Toxicology

Keywords: Acetaminophen, Liver Failure (PubMed Search)

Posted: 12/16/2016 by Kathy Prybys, MD
Click here to contact Kathy Prybys, MD

Acetaminophen is one of the most common pharmaceutical ingestions in overdose and a leading cause of acute of liver failure in the U.S.  Early recognition and treatment is critical for prevention of morbidity.

  • Vigilance and screening is required for this "silent poison", available in hundreds of OTC products and in combination with numerous prescription medications. Symptoms may not be present early in course (for up to 24 hours) in poisoning.
  • Maximal benefit with antidote treatment, n-acetylcysteine (NAC) is time dependent within 8 hours of ingestion. Fulminant hepatotoxicity is unusual in acute overdoses treated with NAC within 10 hours of ingestion.
  • Early prediction of poor prognosis is essential to identify patients who may require life-saving liver transplantation.  Kings College Criteria: Arterial pH less than 7.30, INR greater than 6.5, Creatinine greater than 3.4, Grade III or IV encephalopathy combined with Lactate greater than 3.5 and Phosphate greater than 3.75 may increase sensitivity.

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Title: ED Pharmacist on Time to Thrombolysis

Category: Neurology

Keywords: pharmacist, thrombolysis, door-to-needle time, acute ischemic stroke (PubMed Search)

Posted: 12/14/2016 by WanTsu Wendy Chang, MD
Click here to contact WanTsu Wendy Chang, MD

Impact of an ED pharmacist on time to thrombolysis in acute ischemic stroke

  • Prior studies showed that incorporation of ED pharmacists within ED clinical teams lead to more rapid treatment of trauma, stroke, and STEMI.
  • A recent retrospective study conducted by Montgomery et al. showed that having an ED pharmacist on the stroke alert team increased the number of patients meeting goal door-to-needle time of 60 minutes.

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