Syncope or “blackout”(BO) in breath-hold diving (freediving) is generally considered to be
caused by hypoxia. However, it has been suggested that cardiac arrhythmias affecting the …

Ventilatory acclimatization (VA) is important to maintain adequate oxygenation with ascent to
high altitude (HA). Transient hypoxic ventilatory response tests lack feasibility and fail to …

Background Little is known about the arrhythmia prevalence in Pakistan. We assessed the
frequency of arrhythmias and ECG abnormalities among the Pakistani population attending …

Apnea (breath-holding) elicits co-activation of sympathetic and parasympathetic nervous
systems, affecting cardiac control. In situations of autonomic co-activation (eg, cold water …