Human Electrocardiogram During and After Inhalation of Thirty Per Cent Carbon Dioxide

Abstract
Ecgs. were taken during and immediately following administration of 30% CO2 in 27 observations on 17 human subjects. Duration of CO2 inhalation was from 23-63 sec. Abnormalities of auricular activity were noted in 11 patients, including P inversion, decreased P amplitude, auricular tachycardia and premature systoles. Ventricular premature systoles and increased T wave size were seen, but no marked abnormalities of ventricular activity occurred.