Lung Ultrasound: Evaluation for Pleural Fluid and Pneumothorax

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Lung Ultrasound: Evaluation for Pleural Fluid and Pneumothorax

The Basics

Think about gravity: fluid will collect in most dependent region (down); air tends to collect towards the least dependent regions (up)

Air does not reflect sound waves well. Lungs are filled with air. Rather than getting most of our information from visualizing the anatomy (as in a RUQ ultrasound, for example), much of our information comes from “artifact” or ultrasound waves being affected by phase changes.

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The Urine Drug Screen - Know Thy Limitations

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The Urine Drug Screen - Know Thy Limitations

We are all guilty of ordering them in the ED, but do we really know what we’re ordering?

The Implications of the Urine Drug Screen

1 literature review looked at 7 different retrospective studies describing a total of 1,405 patients and found the urine drug screen did not affect the management of any of these patients while in the emergency department.  However, the data from the UDS can affect a patient’s clinical care outside of the Emergency Department.  For example, if a patient requires psychiatric inpatient care, initial knowledge of drug abuse could affect this patient’s etiology of illness or rehabilitation plan.

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The Approach to Shoulder Radiographs

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The Approach to Shoulder Radiographs

The first snowflakes of the year are falling as you head into your midday Minor Care shift.  Slipping on an icy patch of compacted snow and nearly falling as you head from your car to the ED entrance, you have a sneaking suspicion what the day will bring: falls, slips, and trips.  Indeed, you settle down to the computer, log in to your EMR and pull up the minor care screen to see 2 unseen patients with the chief complaint of “Fall”...

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CSF Evaluation in Subarachnoid Hemorrhage

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CSF Evaluation in Subarachnoid Hemorrhage

So, what constitutes a “positive” tap when evaluating for subarachnoid hemorrhage?

Traditional teaching is that a positive tap is Xanthochromia or blood in the CSF

What exactly is Xanthochromia?

The word xanthochromia is simply Greek for “yellow color.”  It refers to the yellow color that CSF can take in certain situations.  Some of these situations are listed below:

  • Elevated CSF protein            
  • Jaundice
  • Hypervitaminosis A
  • Rifampin Therapy
  • Elevated Bilirubin
  • Oxyhemoglobin

What we are especially interested in when evaluating for subarachnoid hemorrhage is bilirubin and oxyhemoglobin.

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Respiratory Monitoring - An Introduction to Pulse Ox and Capnography

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Respiratory Monitoring - An Introduction to Pulse Ox and Capnography

First a bit of physics....

Both pulse oximetry and capnometry rely on the Beer-Lambert Law. 

  • In 1760, Johann Heinreich Lambert proved that the absorbance of light through a material is proportional to the thickness of the material.  
  • In 1852, August Beer proved that the absorbance of light through a material is proportional to the concentration of the attenuating substance in the material.
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What is Useful in the ED to Help Diagnose or Rule Out Septic Arthritis?

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What is Useful in the ED to Help Diagnose or Rule Out Septic Arthritis?

History

There are many risk factors for septic arthritis including age >80, Diabetes, Rheumatoid Arthritis, recent joint surgery, prosthesis, cellulitis.  The absence of risk factors does not make septic arthritis less likely in an acute monoarticular arthritis

Physical

Monoarticular arthritis is often characterized as a warm, painful, swollen joint with limited range of motion.  No studies to date have quantified specificity data on the physical exam.  Therefore, clinicians must use their own clinical gestalt when interpreting physical exam findings.

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