UMEM Educational Pearls

Intersection Syndrome

De Quervain’s is a common tenosynovitis is involving the  the 1^st dorsal compartment of the wrist/forearm.

Intersection syndrome is a tenosynovitis that occurs at the intersection of the 1^st and 2^nd dorsal compartments.

Pathology located at crossing point of the 1^st compartment structures (APL and EBP) with the radial wrist extensors (ECRB and ECRL)

Occurs most commonly from repetitive wrist extension and is common in rowers, weight lifters, and in those playing racquet sports.

Occurs about 4 to 6cm proximal to the radiocarpal joint VERSUS De Quervain’s which occurs near the level of the radial styloid.

Pain worse with resisted wrist and thumb extension

Radiographs not required

Splint and start NSAIDs

Recalcitrant cases can be referred for corticosteroid injection

https://stemcelldoc.files.wordpress.com/2012/09/intersection-syndrome-referral-pain-pattern1.jpg

• The ACEP clinical policy on the evaluation and management of acute nontraumatic headache in the ED was recently updated.
• Similar to prior policies, it focuses on the diagnosis of subarachnoid hemorrhage (SAH) due to the disproportionate amount of literature in comparison to other high risk etiologies.
• In summary:

• 1. Are there risk-stratification strategies that reliably identify the need for emergent neuroimaging?
     • The Ottawa SAH Rule has a high sensitivity but low specificity for patients presenting with a normal neurological exam and peak headache intensity within 1 hour of symptom onset (Level B recommendation).
     • Caution in application of this rule, as use in the incorrect population may increase unnecessary testing.
  2. Are nonopioids preferred to opioids for treatment of acute primary headache?
     • Preferentially use nonopioid medications in the treatment of acute primary headaches in ED patients (Level A recommendation).
     • Consider discharge medication and education to reduce headache recurrence and repeat ED visit.
  3. Does a normal noncontrast head CT performed within 6 hours of headache onset preclude the need for further diagnostic workup for SAH?
     • Noncontrast head CT using at least a 3rd generation scanner performed within 6 hours of headache onset can be used to rule out nontraumatic SAH (Level B recommendation).
     • If clinical suspicion remains high despite the negative noncontrast head CT, further evaluation may be pursued.
  4. In a patient who is still considered to be at risk for SAH after a negative noncontrast head CT, is CTA as effective as LP to rule out SAH?
     • Use shared decision making to select the best modality for each patient after weighing the potential for false-positive CTA and the pros/cons associated with LP (Level C recommendation).

• This clinical policy does not address the evaluation of other potential etiologies for acute headache, including in the pregnant woman and postpartum woman. 

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The U.S. is currently experiencing an epidemic of a severe lung disease termed Vaping-Associated Pulmonary Illness (VAPI), with over 500 cases and 7 deaths across 38 states and 1 U.S. territory since July 2019.

The clinical presentation of VAPI varies -- 

• Respiratory (SOB, cough, chest pain), constitutional (fever, tachycardia, headache, dizziness), and potentially GI symptoms (vomiting, diarrhea) after the use of vaping devices. GI symptoms may precede respiratory issues.
• Can take days or worsen over weeks and can present or end up with severe respiratory failure

Diagnostics --

• Labs nonspecific: Leukocytosis, elevated ESR, no specific infectious etiology
• Chest CT generally with bilateral infiltrates
• Bronchoscopy with BAL demonstrates PMNs and may have lipid-laden macrophages on Oil red O or Sudan staining

Treatment is supportive +/- steroids -- 

• Current recommendations to treat similarly to ARDS in intubated patients
• Potential benefit to steroids if not contraindicated

Bottom Line: Include vaping-associated pulmonary illness in your differential for patients presenting with acute lung disease.

• Ask patients about use of e-cigarette/vaping devices.
• Notify the CDC or your state health department of any suspected cases.
• Counsel your patients to avoid the use of these devices, at the very least until the specific causative agent is found.

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-       Tibial tubercle avulsion fractures are rare and pediatrics, accounting for less than 3% of all epiphyseal injuries in children ages 11-17 years. 

-       The typical mechanism is a sudden forceful quadriceps contraction.  Patients present with sudden pain after sprinting or jumping with pain, bruising, deformity or swelling over the tibial tubercle and with a decrease ability to extend the leg. 

-       10 to 20% of cases result in anterior compartment syndrome related to the rupture of the anterior tibial recurrent artery.

-       Although directly measured intra-compartmental pressures can facilitate the diagnosis of compartment syndrome, interpretation of these values can be challenging with healthy children having higher average lower leg compartment pressures than adults.  Treatment of subsequent compartment syndrome is often based on a high index of suspicion.

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Cannabinoid hyperemesis syndrome [CHS] (i.e. cyclic/recurrent nausea, vomiting and abdominal pain) is associated with long-term and frequent use of marijuana. Patients with CHS often report temporary relief of symptoms with hot water/shower exposure. Emergency room providers may encounter a growing number of patients with CHS with increasing legalization of marijuana-containing products.

Topical capsaicin has been gaining interest as a potential adjunct to the conventional management of patients with CHS (e.g. antiemetics, opioids, benzodiazepines and antipsychotics).

A small retrospective study was performed involving 43 patients who had multiple visits, and were treated with and without capsaicin. The primary outcome was the ED length of stay (LOS).

Results

• Most frequently administered medications in both groups were:

1. Anti-emetics
2. Haloperidol
3. Diphenhydramine 

• Median ED LOS: no significant difference
  • Capsaicin vs. non-capsaicin: 179 min (IQR: 147, 270) vs. 201 min (IQR: 168, 310) (p=0.33)

• Capsaicin group showed
  • Decreased opioid used: 69 mg vs. 166.5 mg oral morphine equivalents
  • Fewer additional medication administration: 3 vs. 4 doses (p=0.015)
  • Shorter median time to discharge after last medication administration: 60 min (IQR: 35, 115) vs. 92 min (IQR: 47, 155) (p=NS) 

• 67% of the visit where capsaicin was used required no additional medication.

Conclusion

• Capsaicin use did not decrease ED LOS.
• However, there was a decrease in total medications administered and opioid requirement.

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Most non-OB physicians experience some fear or anxiety over taking care of the average pregnant patient. There are two patients to consider when caring for these women. Critical illness adds another layer of complexity to an already challenging patient population. Due to the normal physiologic changes that occur during pregnancy there are specific and important factors to be aware of when considering and preparing for intubation.

• Difficult intubations occur up to 5% of pregnant women.
• Edema occurs in the OP regions resulting in a narrowed OP diameter, especially with advancing gestational age. A smaller than anticipated ET tube might be necessary.
• Weight gain and/or obesity make visualization difficult Consider the ramp position to bring the external auditory meatus and the sternal notch into a horizontal line.
• Aortocaval compression decreases blood return to the heart and can result in hypotension on induction. Consider the use of a wedge under the patient’s right hip to decrease compression during intubation, especially those in later stages of pregnancy.
• Risk of aspiration is increased due to decreased lower esophageal sphincter tone. Consider administering metoclopramide prior to intubation which selectively increases esophageal sphincter.
• Functional residual volume in addition to increased oxygen consumption and metabolic demand lead to quicker desaturations and a greater intolerance to hypoxia and apnea. 
• Be prepared with back up or adjunctive airway options including a video laryngoscope (like Glidescope), an LMA or a supraglottic airway. Although the LMA and supraglottic airways are rescue options in the setting of failed ET intubation, they can often adequately oxygenate and ventilate while urgently consulting with anesthesia colleagues in order to obtain a definitive airway.

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Imaging of Lisfranc Injuries

Tarsometatarsal fracture-dislocation

Anatomy

         3 Columns of the midfoot, divided by the tarsometatarsal joints

1. Medial
   1. First TMT joint
2. Middle
   1. 2^nd and 3^rd TMT joints
3. Lateral
   1. 4^th and 5^th TMT joints

The Lisfranc ligament

     - Extends from the 2^nd MT to the medial cuneiform

     - Critical to structure and stabilization of the 2^nd MT and the midfoot arch

Imaging 

Plain films: AP/lateral/oblique

Consider weight bearing view with contralateral comparison if high suspicion

CT: Can be useful to confirm abnormal plain films

MRI: not done in ED but can be used to diagnose pure ligament injuries

Below is a review of the lines of the foot which will ensure not missing this diagnosis. May be helpful to review with sample imaging.

Plain films findings: https://prod-images.static.radiopaedia.org/images/49189279/86408d5bae08ab80ae9ef377337ab7_big_gallery.jpeg

On AP view:

1. Discontinuity of a line drawn from the medial part of 2^nd MT to the medial side of the 2^nd cuneiform
2. Widening of the interval between the 1^st and 2^nd ray
3. Bony fragment in 1^st MT space (fleck sign) – Lisfranc ligament avulsion

On Lateral view:

1. Dorsal displacement of the proximal 1^st or 2^nd MT (may be subtle)

On the Oblique view:

1. Discontinuity of a line drawn from the medial border of the 3^rd cuneiform with the medial border of the 3^rd MT
2. Discontinuity of a line drawn from the medial side of the 4th MT with the medial side of the cuboid 

Remember that the lateral margin of the 5^th MT can project lateral to the cuboid (up to 3 mm)

Lines drawn on 2 view foot for review

https://radiopaedia.org/cases/lisfranc-ligament-normal-alignment

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Question:  In febrile children younger than 2 years, what combination of clinical and laboratory variables best predicts the probability of a urinary tract infection?

Given that urinary tract infections (UTI) are the most common source of serious or invasive bacterial infections in young febrile infants, early identification and treatment has the potential to reduce poor outcomes.  Wouldn't it be great if there was an easy way to identify patients at highest risk?

Researchers from the Children’s Hospital of Pittsburgh formulated a calculator (UTICalc) that first estimates the probability of urinary tract infection (UTI) based on clinical variables and then updates that probability based on laboratory results.

• The nested case-control study of 2,070 children aged 2 to 23 months with a documented temperature of 38°C or higher
• In contrast with the American Academy of Pediatrics algorithm, the clinical model in UTICalc reduced testing by 8.1% (95% CI, 4.2%-12.0%) AND decreased the number of missed UTIs.

Bottom line:

The UTICalc calculator can be used to guide to tailor testing and treatment in children with suspected urinary tract infection with the hope of improving outcomes for children with UTI by reducing the number of treatment delays.

Go ahead and give it a click!! https://uticalc.pitt.edu/

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Breath analyzers are commonly used by law enforcment officers to test for alcohol intoxication. Breath analyzer uses ethanol partition ratio between blood:breath of 1:2100 = 1 gm of ethanol in 2100 mL of breath/air.

Mouth wash products are frequently used for oral hygiene, and at times, to "mask" odor of substances. These products are readily available in any grocery stores or pharmacy and contain upto 26.9% ethanol (e.g. Listerine) (18.9% - Scope; 14.0% - Cepacol).  

Recently, a small study using healthy volunteers (n=11) was published to investigate the impact of limited ethanol exposure (mouth wash and ethanol vapor) on the breath-alcohol concentration (BrAC).

Method

1. Ethanol vapor exposure (856 mg/m3) for 15 minute. 
2. Oral rinse (for 30 sec) using mouth wash containing 22% ethanol, 1 hour after the ethanol vapor exposure
3. Blood and breath samples were collected before, between and after exposure.

Results

Blood: No or very low levels of ethanol (0.002 mg/g) were detected in blood at all collection time for both exposures.

BrAC - first collection -- seconds after exposure

• Ethanol vapor: 0.14 mg/L (0.014 mg/dL)
• Mouth wash: 4.4 mg/L (0.44 mg/dL)

Mean time to negative BrAC level (Swedish statutory limit of 0.1 mg/L = 0.01 mg/dL in air) (FYI: US limit = 80 mg/dL)

• Ethanol vapor: 0.5 min (0.06 - 0.7 min)
• Mouth wash: 11 min (6 - 15 min) 

Conclusion

• Ethanol vapor did not affect the BrAC
• Mouth wash use can transiently increase BrAC; however, their use does not sufficiently increase the BrAC to result in "false positive" based upon US limit.

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It's important to remember the differential for the patient with Ventricular Assist Device (VAD) difficulties, as these patients are likely to show up in your ED. 

1) Assess the patient as you usually would (signs of life, mental status, breathing, arrhythmias on monitor, etc). Listen for a hum over the chest.  Don't expect to feel a pulse.

2) Look at the VAD including controller, driveline, and power source for alarms, disconnections, signs of infection, and other obvious issues.

3) Look at the power (displayed flow), pulsatility index, and pump speed on the controller to help determine the cause of the issue (see attached chart).  Once you have a suspected etiology, typical management of these issues is usually similar to non-VAD patients (i.e. gentle IVF for hypovolemia, vasodilators if low flow is due to afterload/hypertension, defibrillation/CPR for arresting pts, etc).

Don't forget to call your VAD coordinator when able.  Consider a-line placement for precise evaluation of blood pressure (focus on MAP).

Bottom Line: Consider obstruction/thrombosis, bleeding, infection, hypovolemia, afterload/hypertension, arrhythmia, worsening LV function, and suction events when troubleshooting VADs.  The power, pulsatility index, and pump speed help differentiate these conditions.

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Attachments

• 1909092328_VAD_Differential.jpg (134 Kb)

Droperidol is a butyrophenone with primary action as a dopamine D2 receptor antagonist.  Historically, it has been used to treat a variety of conditions from nausea and headaches to acute agitation.  In 2001, the FDA issued a black box warning for risk of cardiac arrhythmias. Following this warning, droperidol was on national shortage for several years, further limiting its use.

Several months ago, droperidol returned to the US market and is available at some institutions. Below is a refresher on dosing and monitoring.  Similar to haloperidol, droperidol can cause extrapyramidal symptoms. Consider pre-treatment with diphenhydramine.

Dosing Recommendations:

Nausea and vomitting: 1.25 mg IV

Headache: 2.5 mg IV, 5 mg IM

Acute agitation: 5mg IM/IV

QTc prolongation is still a concern, especially at higher doses. If using doses > 2.5mg, or using repeated doses, obtain an ECG to ensure safe use of this medication. If the QTc is greater than 440 msec for males or 450 msec for females, droperidol is not recommended.  There is little data regarding the risk with lower doses. Utilize clinical judgement and assess patient risk factors.

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Numerous different household products can potentially be misused/abused. One such product is whipped cream charger/propellant that contains nitrous oxide.

Acute toxicity produce dose dependent response

• Euphoria 
• Anxiolysis
• Sedation
• Unconsciousness
• Asphyxiation

Chronic toxicity causes myeloneuropathy (demyelination of the dorsal and lateral columns of the spinal cord) due to vitamin B12 deficiency

• Extremity paresthesias
• Ataxia
• Peripheral sensory neuropathy (loss of vibration sense and proprioception)
• Weakness 
• Hematologic effects: leukopenia, thrombocytopenia, megaloblastic anemia

Management

• Cessation of nitrous oxide use
• Vitamin B12 (cyanocobalamin) repletion (IM)

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One third of your critically ill patients will have atrial fibrillation. 

More than one third of those patients will develop immediate hypotension because of it.

More than one in ten will develop ischemia or heart failure because of it.

This is what you should know for your next shift:

#1 Don't wait to use electricity. If your patient is hypotensive or ischemic because of atrial fibrillation, you do not need to wait for anticoagulation before you cardiovert.

#2 Electricity buys you time to load meds. Fewer than half of patients you cardiovert will be in sinus rhythm an hour later and fewer than a quarter at the end of a day.

#3 There is no perfect rate control agent. Beta blockers have a lower mortality in A-fib from sepsis. Esmolol has the benefit of being short-acting if you cause hypotension. Diltiazem has better sustained control than amiodarone or digoxin. 

#4 There is no perfect rhythm control agent. Magnesium is first-line in guidelines. Amiodarone can be used even when there is coronary artery or structural heart disease.

#5 Anticoagulation is controversial. In sepsis, anticoagulation does not reduce the rate of in-hospital stroke, but does increase the risk of bleeding. Use with caution if cardioversion isn't planned.

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There is no standardized national reporting of dog bites in the US. Based on the reported figures, it is estimated that 2% of Americans are bitten annually, and children are affected disproportionately. With kids, it's usually the family dog, and occurs at home.

To avoid infection, usually from Pasturella species, many of us were taught never to primarily repair dog bites by suturing, and to always prescribe prophylactic antibiotic coverage with amoxicillin-clavulanate. However, the literature recommends otherwise in certain cases.

Bite wounds to the face and hands should have special considerations.  In general, face wounds heal with lower rates of infection, but provide the greatest concern for cosmetic appearance.  Hand wounds have notoriously higher rates of infection.  

The latest recommendations for dog bites are as follows:

1. All dog bites should be copiously irrigated under high pressure.

2. Dog bites to the face should be primarily repaired when <8 hours old, as infection rates are not significantly different and cosmesis is greatly improved. 

3. Injuries to the hands should be left open, unless function is in jeopardy or there are neurovascular concerns.

4.  Prophylactic antibiotics do not always have to be prescribed, especially in low risk patients.  Examples of high risk patients include, but are not limited to: primarily repaired bites, injuries in the hand, >8 hours old, deep or macerated or multiple bites, and the immunocompromised.

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• Elevated BP is common with acute ICH and is associated with hematoma expansion and worse outcome.
• Early BP lowering in ICH appear to be safe, though did not improve outcomes in the two largest trials INTERACT2 and ATACH-II.
• A preplanned pooled analysis of 3829 patients from these 2 trials found:
  • Every 10 mmHg reduction in SBP was associated with a 10% increase in odds of better functional recovery.
  • Reduced variability of SBP was associated with improved outcomes.
• The association between BP variability and outcomes in ICH has been observed in several other recent studies.

Bottom Line: Reduced SBP variability is associated with improved outcomes in ICH.

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Critical Care Management of AIS

• In addition to reperfusion therapy, the critical care management of patients with an acute ischemic stroke also includes airway and ventilation management, hemodynamic management, glucose control, anticoagulation management, and surgery in select cases.
• Consider the following management pearls:
  • Mechanical ventilation
    • Target SpO2 > 94% (avoid supplemental oxygen for non-hypoxemic patients)
    • Target normocarbia (PaCO2 35-45 mmHg)
  • Hemodynamics
    • Target euvolemia with isotonic saline
    • Target BP < 185/110 mmHg for 24 hrs after tPA
    • Target BP < 220/120 mmHg if tPA ineligible
    • Target SBP < 160 mmHg after endovascular therapy
  • Glucose
    • Target serum glucose 140-180 mg/dL

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Tarsometatarsal fracture-dislocation

The Lisfranc ligament is critical for stabilization of the midfoot arch and the 2^nd MT

Injuries can range from mild (sprains) to severe (gross dislocation)

Injury may be purely ligamentous injuries or a fracture-dislocations

Difficult diagnosis to make

https://www.aafp.org/afp/1998/0701/afp19980701p118-f4.jpg

Mechanisms: MVAs, fall from height or athletic injuries

            Common athletic mechanism: Axial load to a hyperplantar flexed forefoot

https://thumbs.dreamstime.com/z/vector-illustration-healthy-human-foot-foot-lisfranc-injury-weight-bearing-mechanism-injury-100392176.jpg

Injury severity is often underestimated

Severe pain and inability to weight bear

Plantar bruising and bruising throughout midfoot

https://footeducation.com/wp-content/uploads/2019/02/Figure-3-Bruising-from-Lisfranc-Injury-600x781.png

No specific tests as exam is limited due to pain

Midfoot stress tests

-Often positive but unlikely to be allowed by patient due to pain

https://www.youtube.com/watch?v=v8SGVwz2RHs

Midfoot instability test

Grasp metatarsal heads and apply dorsal force to forefoot.

Other hand palpates the TMT joints and feels for dorsal subluxation

• The assessment of peripheral nerves in children with upper limb injuries can be challenging. 
• Neurovascular deficit was not documented in 25% of children presenting with upper extremity injury
• BOAST (British Orthopedic Association Standards for Trauma) guidelines state that each of the Median, Ulnar, Radial, Anterior Interosseous Nerve exams must be individually documented in any supracondylar fracture
• Dawson described an easy way to test and document your exam. Have the child play “Rock, Paper, Scissors, Ok”
  • Rock: tests the Median nerve
  • Paper: tests the Radial nerve
  • Scissors: tests the Ulnar nerve
  • Ok: tests the Anterior Interosseous nerve
• This method increased proper documentation and reduced missed nerve injuries in upper extremity fractures.
• Dr. Sarah Edwards and Dr. Hannah Lock created an easy infographic in the link below and found near 100% increase in NV documentation in their ED. Their poster won the prize for best infographic at the 2018 Emergency Medicine Educators' Conference (EMEC)
• https://www.peminfographics.com/infographics/rock-paper-scissors-ok

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Center for Disease Control and Prevention (CDC) recently issued alerts regarding cases of pulmonary illnesses that may be linked to "vaping" (in 15 states with 149 possible cases). These cases are still under investigation but all cases reported vaping weeks/months prior to hospitalization.

Most cases involve young adults who have been using THC-containing products

Common complaints included

• Gradual onset of shortness of breath, cough, and chest pain
• GI symptoms: nausea, vomiting and diarrhea
• Fever, fatigue

Imaging studies:

• Chest x-ray can show bilateral opacity
• CT lung demonstrates ground-glass opacities with sub-pleural sparing.

Clinical course

• Some cases required mechanical intubation
• Corticosteroid treatment appears to improve clinical course
• Infectious evaluation was negative in almost all cases.
• No clear causative etiology has been identified
• No death has been reported 

What to do:

• Inquire about vaping history when treating patients with suspected cases.
• Providers should contact their local health department, poison center or CDC (VapingAssocIllness@cdc.gov) to report possible case of vaping associated pulmonary injury 

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A new study confirmed the previously-known antibiotics to be associated with Torsades de pointes and QT prolongation (Macrolides, Linezolid, Imipenem and Fluoroquinolones). However, this study found new association between amikacin and Torsades de pointes/QT prolongation.

Methods

The authors queried the United States FDA Adverse Event Reporting System (FAERS) from 01/01/2015 to 12/31/2017 for reports of Torsade de points/QT prolongation (TdP/QT).

Reporting Odd Ratio (ROR) was calculated as the ratio of the odds of reporting TdP/QTP versus all other ADRs for a given drug, compared with these reporting odds for all other drugs present in FAERS

Results

FAERS contained 2,042,801 reports from January 1, 2015 to December 31, 2017. There were 3,960 TdP/QTP reports from the study period (0.19%).

Macrolides               ROR 14 (95% CI 11.8-17.38)

Linezolid                  ROR 12 (95% CI 8.5-18)

Amikacin                 ROR 11.8 (5.57-24.97)

Imipenem-cilastatin ROR 6.6 (3.13-13.9)

Fluoroquinolones   ROR 5.68 (95% CI 4.78-6.76)

Limitations:

These adverse events are voluntary reports

There might be other confounded by concomitant drugs such as ondansetron, azole anti-fungals, antipsychotics.

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