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This is a well organized monograph in which the author emphasizes the importance of changes in the electrocardiogram during a deep inspiration and contends that an electrocardiographic study is not complete unless this is taken into consideration. This leading idea is supported by numerous examples and illustrated by excellent illustrations.
Variaciones respiratorias del electrocardiograma. JAMA. 1943;122(9):641. doi:10.1001/jama.1943.02840260069034