Contributions to the functional morphology of the P wave.

Abstract 1.1. The P wave, specifically the peaked-form variety, was studied in normal individuals, in subjects with cor pulmonale, and in those with acute experimental pulmonale P pattern produced by breathing against manometric pressure. 2.2. In addition to the conventional data, some new functional criteria, such as rising time and rising velocity, were investigated. The angular structure of the atrial triangle was examined and the standard values established. 3.3. The correlation between the linear and angular structure of the atrial wave and cardiac rate and age was established exactly. 4.4. The index of Macruz was critically examined in light of the conditions described, and its diagnostic value assessed. 5.5. The methods of investigation herein described increase the diagnostic value of the conventional electrocardiogram with respect to the atrial wave.