The nitrous oxide method provided semiquantitative coronary flow values in dogs, with an average variation of ±12.4% compared to direct measurement using a rotameter.
Coronary flow per minute per 100 Gm. of heart with venous drainage into the coronary sinus as measured by the nitrous oxide procedure was compared in the dog with left coronary artery inflow per 100 Gm. of heart perfused by this artery as measured by the rotameter. The error arising from epicardial leak of nitrous oxide was prevented or quantitated by appropriate coverage of the heart. Extremes of the comparisons were +21 and -22 per cent, with an average variation of ±12.4 per cent. The nitrous oxide method is regarded as giving semiquantitative coronary flow values per 100 Gm. of left heart in the dog.
Gregg et al. (Mon,) conducted a other in Coronary flow measurement. Nitrous oxide method vs. Direct method using the rotameter was evaluated on Coronary flow per minute per 100 Gm. of heart. The nitrous oxide method provided semiquantitative coronary flow values in dogs, with an average variation of ±12.4% compared to direct measurement using a rotameter.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: