Key result
Acetylcholine-induced fibrillation increases atrial potassium efflux ~3-fold, suggesting increased sodium permeability.
Why the study?
The mechanisms of potassium flux changes during acetylcholine-induced fibrillation in isolated rabbit atria were unclear.
Effect estimate: Efflux increased 3 to 4 times; influx unchanged
In isolated rabbit atria, acetylcholine-induced fibrillation increases potassium efflux without altering influx, suggesting initiation involves increased sodium permeability rather than inhibited active potassium uptake.
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No immediate clinical implications for AF; hypothesis-generating for Na permeability mechanisms in arrhythmia models.
Holland et al. (1959) studied Acetylcholine-induced fibrillation. Acetylcholine-induced fibrillation was evaluated on Absolute influx and efflux of potassium-42 (Efflux increased 3 to 4 times; influx unchanged). During acetylcholine-induced fibrillation in isolated rabbit atria, potassium efflux increased three to four times while influx remained unchanged, suggesting increased Na permeability.
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