Delayed afterdepolarization implies?
Ans. is 'd' i.e., All of the aboveDelayed afterdepolarizations occur in late phase 3 or early phase 4 when the action potential is nearly of fully repolarized.The mechanism is poorly understood; however, this type of arrhythmia is found to be associated with high intracellular Ca++ concentrations as occurs with digitalis toxicity or excessive catecholamine stimulation.The triggered impulse can lead to a series of rapid depolarizations (i.e. a tachyarrhythmia).
Increased intracellular Ca"
Excessive catecholamines
Digitalis toxicity
All of the above