Great lecture by Dr. Haney Mallemat (@CriticalCareNow) introducing the fundamental concepts for Right Ventricular (RV) Echo.
Ultrasound showing regional wall motion abnormalities in a patient with chest pain
Pediatric Emergency Medicine Pearls: Perfecting your pediatric lumbar puncture using ultrasound with an included video tutorial.
Video tutorial of the basics of interpretation of cardiac regional wall motion abnormalities by echocardiography
Behold...the future of ultrasound in cardiac arrest...which people have said for let's hope eventually

Core EM: Ultrasound Guided Pericardiocentesis

Ultrasound   Blog Post + Videocast Learning Time: 10mins
Learn ultrasound guided pericardiocentesis for cardiac tamponade!
Using ultrasound for pneumonia in the emergency department
Part Two of the intussusception series focuses on using ultrasound to make the diagnosis.
Author Insight: Ultrasonography versus CT for suspected nephrolithiasis | NEJM
Good overview how the LV looks in different functional states as well as a primer on the RUSH exam for helping diagnose a cause for hypotension.
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