Electrocardiogram problem, understand!

Electrocardiographic characteristics of sinus tachycardia The electrocardiographic characteristics of sinus tachycardia are as follows: (1)P wave has the characteristics of sinus rhythm. (2) The P-R interval is between 0. 12 and 0.20 seconds. (3) The heart rate exceeds 100 beats/min, 1 year-old exceeds 140 beats/min, 1 ~ 6-year-old exceeds 120 beats/min, which is the same as that of adults over 6 years old. Adults can generally reach 150 times/minute, P? R is slightly irregular but often < 0. 12 seconds. (4) Other possible changes. ①P wave is high and sharp, especially in lead ⅱ. ②T-P fusion leads to false downward movement of S-T segment. ③S-T and T changes. ④ Accompanied by atrioventricular block.

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