a "sine wave" pattern (see below), which is frequently a fatal rhythm. Giving IV calcium is "cardioprotective" in the setting of hyperkalemia. Frequently, instant reversal of all hyperkalemic ECG ...

Sine-wave speech can be thought of as a sort of auditory illusion, a sensory edge case in which one’s experience has a clear “before” and “after” moment, like going through a one-way door.

Eventually a “sine wave” pattern ensues ... Idioventricular rhythms meet criteria for ventricular tachycardia, but have a heart rate of < 100. Massive left atrial enlargement causes a notch ...