GENERAL ANATOMY
ANATOMY OF THE HEART
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A increased P-R interval
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An inverted T wave
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A complete absence of the QRS complex
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A doubled P wave
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Detailed explanation-1: -Without appropriate conduction through the AV node, the SA node cannot act to control the heart rate, and cardiac output can diminish secondary to loss of coordination of the atria and the ventricles. The condition can be fatal if not promptly treated.
Detailed explanation-2: -A prolonged PR interval represents a delay in the time it takes for the signal to move across the atria at the top of the heart, which receive blood flowing in from the veins, into the ventricles at the bottom of the heart, which pump blood out into the arteries.
Detailed explanation-3: -Third degree heart block A third degree, or complete, heart block is where there is no transmission of electrical pulses between the AV node and the ventricles.
Detailed explanation-4: -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.