12-27-2005, 06:54 AM
A 24-year-old man dies suddenly. At autopsy, there is evidence of cocaine abuse but no evidence of gross or microscopic structural alterations of the heart. Which of the following is the most likely cause of the cardiac malfunction in this man?
A) Blockade of Ca2+ channels
B) Blockade of dopamine synthesis
C) Potentiation of norepinephrine and blocking of its presynaptic uptake
D) Potentiation of serotonin at postsynaptic sites in the atrioventricular node
E) Stroke due to malignant hypertension
A) Blockade of Ca2+ channels
B) Blockade of dopamine synthesis
C) Potentiation of norepinephrine and blocking of its presynaptic uptake
D) Potentiation of serotonin at postsynaptic sites in the atrioventricular node
E) Stroke due to malignant hypertension