MEDICINE
CARDIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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fusion.
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reentry.
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ectopy.
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excitability.
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Detailed explanation-1: -Bombardment of the AV node by more than one impulse, potentially blocking the pathway for one impulse and allowing the other impulse to stimulate cardiac cells that have already depolarized, is called: reentry.
Detailed explanation-2: -First-degree atrioventricular (AV) block is a condition of abnormally slow conduction through the AV node. It is defined by ECG changes that include a PR interval of greater than 0.20 without disruption of atrial to ventricular conduction.
Detailed explanation-3: -If an impulse generated by the AV node begins moving upward through the atria before the other part of it enters the ventricles: an inverted P wave will appear before the QRS complex.
Detailed explanation-4: -In the AV node, the impulses are slowed down for a very short time. This allows the atria to contract a fraction of a second before the ventricles. The blood from the atria empties into the ventricles before the ventricles contract.