Mj. Tipton et al., SUPRAVENTRICULAR ARRHYTHMIAS FOLLOWING BREATH-HOLD SUBMERSIONS IN COLD-WATER, Undersea & hyperbaric medicine, 21(3), 1994, pp. 305-313
Citations number
22
Categorie Soggetti
Medicine Miscellaneus","Marine & Freshwater Biology
Twelve subjects undertook one submersion into water at 5 degrees C aci
d two at 10 degrees C wearing either a wet or dry suit. During the sub
mersions the subjects held their breath for as long as they could and
then breathed through respiratory tubing for a further 10 s before bei
ng removed from the water. Bradycardia (heart rate <60 beats/min) was
observed during breath holding in 10 subjects in 28 of the 36 submersi
ons. Ectopic arrhythmias were observed in 11 subjects in 29 of the 36
submersions, a much higher frequency than previously reported. These e
ctopic arrhythmias included premature atrial and junctional complexes,
runs of supraventricular tachycardia, and premature ventricular compl
exes. They occurred predominantly in the 10-s period of submersion aft
er the cessation of breath holding. The possible etiology of these arr
hythmias and their significance are discussed and it is concluded that
after breath-hold termination during cold-water submersion there is a
short time during which the heart may be particularly susceptible to
supraventricular ectopic arrhythmias.