Question

if someone's heart skips a QRS complex and T-wave, why would they be fatigued? provide a mechanism

Answer 1

People whose heart skips a QRS complex and T-wave can be fatigued due to :

1. Reduced cardiac output
   1. The electrical activity of the heart is coupled with mechanical activity.
   2. The QRS complex (ventricular depolarization) is followed by ventricular muscle contraction.
   3. The T wave (Ventricular repolarization) is followed by ventricular muscle relaxation.
   4. As the electrical activity is skipped, the mechanical activity is also skipped.
   5. As a result, cardiac output reduces.
   6. Reduced cardiac output doesn't fulfill the metabolic needs of the body.
   7. Therefore, a person feels fatigues
2. Reduce coronary blood flow
   1. Reduce cardiac output reduces the coronary blood flow
   2. The right and the left coronary arteries arise from the aortic sinuses.
   3. These are arteries of the heart they provided blood flow to the cardiac muscles.
   4. Reduce blood flow to the heart can cause ischemia
   5. This reduces force of contraction and therefore reduces the cardiac output.
   6. Cardiac ischemia also gives rise to chest pain