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Question 21
In a heart transplant recipient, each of the following statements is true EXCEPT
A.Sinus tachycardia at rest can be normal
B.The effect of atropine is exaggerated in the denervated heart
C.The response to -adrenergic drugs is normal or increased
D.The ECG is often read as atrial fibrillation or flutter
E.The patient will be immuno-suppressed for life
ANSWER & COMMENTS:
•B
•Comments:
–Atropine has no effect on the denervated heart because it acts by blocking actions of the vagus nerve.
–The response to catecholamines may be increased by upregulation of receptors in the denervated heart.
–The resting heart rate is usually between 90 and 100 beats per minute.
–The ECG often displays multiple P waves, from both the new heart and a residual portion of the original atria.
–Life long immuno-suppression is mandatory to prevent rejection.
In a heart transplant recipient, each of the following statements is true EXCEPT
A.Sinus tachycardia at rest can be normal
B.The effect of atropine is exaggerated in the denervated heart
C.The response to -adrenergic drugs is normal or increased
D.The ECG is often read as atrial fibrillation or flutter
E.The patient will be immuno-suppressed for life
ANSWER & COMMENTS:
•B
•Comments:
–Atropine has no effect on the denervated heart because it acts by blocking actions of the vagus nerve.
–The response to catecholamines may be increased by upregulation of receptors in the denervated heart.
–The resting heart rate is usually between 90 and 100 beats per minute.
–The ECG often displays multiple P waves, from both the new heart and a residual portion of the original atria.
–Life long immuno-suppression is mandatory to prevent rejection.
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