Why the study?
Heart rate during prolonged breath-holding until the point of loss of consciousness had not previously been published.
A bigeminal cardiac arrhythmia pattern was observed preceding blackout in a breath-hold diver, suggesting that arrhythmias may contribute to syncope during prolonged apnea alongside hypoxia.
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Alerts to arrhythmic risk in extreme apnea; leaves open causal role in blackout.
Mulder et al. (2023) studied this question.
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