A woman reports a racing heart that began while she was playing softball 2 hours ago. Her ECG shows a rapid and regular heart rate, and she is given an intravenous bolus of a drug that activates G protein–coupled receptors. Which drug mechanism may lead to termination of the arrhythmia?
The woman possibly has supraventricular tachycardia which may precipitate by a premature atrial deplorization. Adenosine is administered to her which will bind and activate the G-protein coupled receptor that has adenosine binding site. This activation leads to the efflux of potassium and the hyperpolarization of supraventricular tissue.
The drug type used in this case should be beta blocker drug who has G protein as transduction unit where beta 1 or beta 2 adrenergic receptor is blocked.
