Chapman, T. T. (1974).Thorax, 29, 106-109. Lung function tests and a `vertical' P wave axis in the electrocardiogram. The relationship between a vertical P wave axis and impaired lung function was studied in 1,144 patients with chronic non-specific lung disease. There was a significant relationship between a vertical P wave axis and reduction in forced expiratory volume (FEV1), FEV1 as a percentage of vital capacity (FEV1%VC), residual volume (RV), and transfer factor (TF); this relationship was closest in the case of the FEV1%VC. There was no significant correlation between P wave axis and the forced inspiratory volume (FIV1).
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