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How a pause can cause cardiac arrest

Dr. Smith's ECG Blog

While on telemetry monitoring he suffered cardiac arrest and was resuscitated. What ECG finding may have contributed to (or precipitated) the cardiac arrest? Learning points : Takotsubo can lead to cardiac arrest from ventricular arrhythmia. There are no clear signs of OMI. There is a prolonged QTc.

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A 20-something woman with cardiac arrest.

Dr. Smith's ECG Blog

During the night, while on telemetry, the patient became bradycardic, with periods of isorhythmic AV dissociation (nodal escape rhythm alternating with sinus bradycardia), and there were sporadic PVCs. Cardiac arrest was called and advanced life support was undertaken for this patient. Without an MRI, it is impossible to know.

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How will you save this critically ill patient? A fundamental and lifesaving ECG interpretation that everyone must recognize instantly.

Dr. Smith's ECG Blog

See our other countless hyperkalemia cases below: General hyperkalemia cases: A 50s year old man with lightheadedness and bradycardia Patient with Dyspnea. A woman with near-syncope, bradycardia, and hypotension What happens if you do not recognize this ECG instantly? HyperKalemia with Cardiac Arrest. With a twist.

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An Unusual Bradycardia

Dr. Smith's ECG Blog

Krantz et al authored a State-of-the-Art Review on Cardiovascular Complications of Opioid Use ( JACC 77(2):205-223, 2021 ) — in which mechanisms from Opioid Overdose that detail arrhythmia production ( up to cardiac arrest ) are elucidated — thereby providing an explanation for the unusual arrhythmias in today's case.

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What is this ECG finding? Do you understand it before you hear the clinical context?

Dr. Smith's ECG Blog

See our other blog posts of hypothermia and Osborn waves -- Massive Osborn Waves of Severe Hypothermia (23.6 C), with Cardiac Echo -- A Pathognomonic ECG. His temperature was brought back to normal over time in the ICU. He was extubated and had normal neurologic function. He did well and was discharged. Is there a long QT?

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Normal angiogram one week prior. Must be myocarditis then?

Dr. Smith's ECG Blog

IMPRESSION: The finding of sinus bradycardia with 1st-degree AV block + marked sinus arrhythmia + the change in PR interval from beat #5-to-beat #6 — suggests a form of vagotonic block ( See My Comment in the October 9, 2020 post in Dr. Smith's ECG Blog ). Initial high sensitivity troponin I returned at 6ng/L (normal 0.20

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A middle aged man with unwitnessed cardiac arrest

Dr. Smith's ECG Blog

Written by Pendell Meyers, with edits by Steve Smith Thanks to my attending Nic Thompson who superbly led this resuscitation We received a call that a middle aged male in cardiac arrest was 5 minutes out. He was estimated to be in his 50s, with no known PMHx. He arrived with chest compressions ongoing, intubated, and being bagged.