Key result
Bolus injection of ATP and adenosine shortened atrial monophasic action potential duration and inhomogeneously shortened f-f intervals, with maximal shortening in the right atrial appendage.
Why the study?
Does bolus injection of ATP or adenosine alter atrial and ventricular action potential duration and refractoriness in humans?
Does bolus injection of ATP or adenosine alter atrial and ventricular action potential duration and refractoriness in humans?
Answers are grounded in this paper and cite their sources.
ATP and adenosine cause inhomogeneous shortening of atrial refractoriness, providing a mechanistic explanation for why these drugs can provoke atrial fibrillation.
Bolus injection of adenosine triphosphate (ATP) or adenosine is widely used clinically for terminating supraventricular tachycardia. However, bolus injection of these drugs has been reported to provoke atrial fibrillation (Afib). The effects of ATP and adenosine on the monophasic action potential duration (MAPD) of atrial and ventricular muscle was investigated, as well as the changes in the spatial distribution of atrial functional refractoriness caused by adenosine. Bolus injection of ATP and adenosine shortened atrial MAPD; no change was observed in the ventricle. Because local f-f intervals during atrial fibrillation correlate with the atrial refractory period, changes in mean f-f intervals in the right atrial appendage, His bundle region, coronary sinus ostium and distal coronary sinus were compared before and after injection of adenosine during induced Afib. Maximal shortening of f-f intervals was observed in the right atrial appendage. Inhomogeneous shortening of atrial refractoriness may account for the Afib following bolus injection of ATP or adenosine.
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Nakai et al. (2000) studied Induced atrial fibrillation. Adenosine triphosphate (ATP) and adenosine vs. Baseline (before injection) was evaluated on Monophasic action potential duration (MAPD) of atrial and ventricular muscle and changes in mean f-f intervals. Bolus injection of ATP and adenosine shortened atrial monophasic action potential duration and inhomogeneously shortened f-f intervals, with maximal shortening in the right atrial appendage.
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