ECG interpretation in athletes requires careful analysis to properly distinguish physiological changes related to athlete's heart from findings suggestive of an underlying pathological ... sinus ...

ECG Challenge: What's Causing This Long Pause? An older woman visits the hospital after fainting, and telemetry shows long pauses in her heart's rhythms. What does the ECG show?

During an ECG, sticky patches connected ... heart or dangerous arrhythmias like heart block: Sinus arrhythmia is a variation ...

The rhythm is regular at a rate of 130 beats/min ... This is a case of left posterior fascicular block. Note the beat-to-beat changes in the QRS complex amplitude (*, ^); these are known as ...