Abstract:ObjectiveTo explore the relationship between heart rate and the amplitude of P wave.MethodsTwo hundred and fortyfive patients examined by 24 h ambulatory electrocardiography(Holter) in our hospital were randomly selected. Based on their Holter screenshots including the fastest and the slowest heart rate, the heart rates and P wave amplitudes were measured separately, and the average values of P wave amplitudes in different ranges of heart rates were calculated and compared. The reasons for the changes of P wave amplitudes were analysed. ResultsThere was significant difference between the P wave amplitude at a heart rate over 120 beats/min and the one at a heart rate below 120 beats/min. And there was no obvious correlationship between the increase of P wave amplitude and right atrial enlargement or pulmonary artery hypertension.ConclusionWhen heart rate is over 120 beats/min, the increase of P wave amplitude mainly results from elevated autonomic nerve tension.