Widening of the p-wave is considered left atrial hypertrophy, but in the EKG is usually only suggestive of widening of the p-wave. Sinus bradycardia is defined as a heart rate of less than 60 beats per minute. 1. p-wave widening is usually diagnosed by ECG, and the common ECG waveforms are composed of P wave, QRS wave and T wave, because p wave represents the depolarization wave of the atria, and the widening of the P wave usually means that the time is more than 0.12s, which may be caused by organic cardiac pathology such as left atrial hypertrophy. It may be caused by organic cardiac lesions such as left atrial hypertrophy. It is necessary to further improve the cardiac ultrasound and other examinations to further clarify the diagnosis. 2. Normally, the normal heart rate comes from the sinus so it is called sinus rhythm, and the normal heart rate of adults is 60~100 times/minute. The normal heart rate in adults is 60-100 beats per minute. When the heart rate is less than 60 beats per minute in the resting state, it is called sinus bradycardia. Sinus bradycardia is physiological, such as athletes, the elderly, etc.; there are also pathological such as pathological sinus node syndrome, hypothyroidism, electrolyte disorders, acute myocardial infarction. The appearance of abnormal heart rate and other discomforts, please timely hospital consultation, active diagnosis and treatment, so as not to delay the condition.