Key result
Extreme hypoxia during static apnea is linked to brady-arrhythmias, reducing heart rates to ~46 bpm.
Why the study?
The cardiac electrical conduction system is sensitive to hypoxia, and the role of extreme hypoxia in causing brady-arrhythmias during maximum apnea in elite breath-hold divers was unclear.
Does maximum apnea induce brady-arrhythmias via extreme hypoxia rather than hypoglycemia in elite breath-hold divers?
Comparison
Baseline measurements prior to apnea vs during maximum apnea
Design
Observational study with ECG and arterial catheter monitoring
Follow-up
Duration of maximum apnea (approximately 385 seconds)
Authors
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Hypoxia may provoke bradyarrhythmias in elite breath-hold divers; leaves open relevance to clinical hypoxia syndromes.
Observational (n=9)
Does maximum apnea induce brady-arrhythmias via extreme hypoxia rather than hypoglycemia in elite breath-hold divers?
Extreme hypoxia, rather than hypoglycemia, is the primary driver of brady-arrhythmias during maximum apnea in elite breath-hold divers.
Kjeld et al. (2021) conducted an observational in Elite breath-hold divers (n=9). Maximum static apnea vs. Baseline was evaluated on Arterial blood glucose, peripheral saturation, heart rhythm, and mean arterial blood pressure. During maximum static apnea in elite breath-hold divers, extreme hypoxia (saturation dropping to 58.5%) caused brady-arrhythmias, with heart rate decreasing from 86 to 46 beats/minute (P<0.001).
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