A patient who is taking trimethoprim-sulfamethoxazole for prophylaxis of urinary tract infections tells the primary care NP that a sibling recently died from a sudden cardiac arrest, determined to be from long QT syndrome. The NP should:
a. schedule a treadmill stress test.
b. order genetic testing for this patient.
c. discontinue the trimethoprim-sulfamethoxazole.
d. refer the patient to a cardiologist for further evaluation.
B
When a family member's death is found to be from long QT syndrome, the entire family must undergo testing. Treadmill testing may be normal in many cases. Trimethoprim-sulfamethoxazole can prolong the QT interval and should not be used in patients at risk, but genetic testing should be performed to determine this.
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