Why Does Extrasystole Occur During Relaxation?

Extrasystole is only possible during relaxation because no new stimulation can take place during the absolute refractory period

. Due to this wave summation tetanus can't be achieved and the extrasystole can't occur until relaxation.

What effect did extreme vagus nerve stimulation have on the heart?

Here's how: When someone is extremely stressed, the vagus nerve can get overstimulated as it works to bring down heart rate and blood pressure. This may cause someone's heartbeat to slow down too much. Blood pressure may now plummet.

What does an Extrasystole correspond to?

Extrasystoles are additional heartbeats that occur outside the physiological heart rhythm and can cause unpleasant symptoms. Extrasystoles are also referred to as skipped heartbeats, “heart hiccups“ or palpitations, and are medically regarded as a form of cardiac arrhythmia.