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Review Question - QID 109586

SA Node Action Potential SA Node Action Potential; also AV Node Heart rate QID: 109586 (M1.CV.17.4867)
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QID 109586 (Type "109586" in App Search)
A 42-year-old male presents to the emergency department due to severe headaches and palpitations. He has had previous episodes of sweating and headache, but this episode was particularly disabling. Upon presentation, he appears pale and diaphoretic. His temperature is 99.3°F (37.4°C), blood pressure is 162/118 mmHg, pulse is 87/min, and respirations are 20/min. Based on clinical suspicion, an abdominal CT scan is obtained, which shows a retroperitoneal mass. This patient's increased heart rate is most likely due to a change in activity of which of the following channels?
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