Key result
Atropine doubles acetylcholine release in human atria via muscarinic M2-receptor blockade.
Why the study?
An imbalance of sympathetic and parasympathetic drive to the heart is an important risk factor for cardiac death, and the role of muscarinic autoreceptors in acetylcholine release in human atria was unclear.
Demonstrates that acetylcholine release in human atria is regulated by M2-receptors and is impaired in elderly and diabetic patients, suggesting a mechanism for autonomic imbalance and sudden cardiac death.
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Supports M2 autoregulation of atrial acetylcholine in animal models; leaves open clinical relevance for autonomic imbalance in elderly and diabetic patients.
Oberhauser et al. (2001) studied Human heart atrium. Atropine was evaluated on Acetylcholine release. Acetylcholine release in human atria is controlled by muscarinic M(2)-receptors, and blockade of these receptors by atropine doubles the amount of acetylcholine released at 5 Hz stimulation.
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