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This monograph is a study based on careful measurement of the various components of the electrocardiogram in the three standard limb leads in four groups of patients; tuberculous patients, controls, ambulant pneumothorax patients, and patients with acute rheumatic fever. The author observed a greater incidence of abnormal electrocardiograms among tuberculous than the nontuberculous patients. He noted a tendency especially toward lower P and T waves in leads 1 and 2 among the tuberculous patients, the differences from the control group being statistically significant. The various factors that could possibly be responsible for these differences were then studied. They included the incidence of nontuberculous heart disease, changes in heart position due to body build or collapse therapy, the importance of increased heart rate, chronic cor pulmonale, the severity of the tuberculosis, and bed rest. By statistical analysis the author claims that, after all of the above factors are taken into consideration,
The Electrocardiogram in Pulmonary Tuberculosis. JAMA. 1951;147(13):1306. doi:10.1001/jama.1951.03670300120035
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