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Time Intervals in the Electrocardiogram of Healthy Infants
Author(s) -
COLEMAN ERIC N.
Publication year - 1961
Publication title -
acta pædiatrica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 115
eISSN - 1651-2227
pISSN - 0803-5253
DOI - 10.1111/j.1651-2227.1961.tb08188.x
Subject(s) - medicine , qt interval , qrs complex , heart rate , cardiology , pr interval , electrocardiography , sinus rhythm , st segment , anesthesia , blood pressure , atrial fibrillation , myocardial infarction
Summary The standard limb leads of the electrocardiograms of 100 healthy infants were examined. The heart rate and the length of the P wave, PR interval, QRS complex, T wave, ST segment, QT interval and the corrected QT interval (QTc) were measured. The heart rate showed wide variations throughout the period under review but decreased as age advanced. Sinus arrhythmia was encountered only five times but minor differences in the length of cardiac cycles occurred frequently. No other disturbance of rhythm was observed. The P wave, PR interval, QRS complex and T wave lengthened as age increased and, the P wave excepted, as the heart rate slowed. The ST segment tended to shorten both with increasing age and increasing heart rate. The linear association between the length of the QT interval and the heart rate was confirmed. The observed values for the corrected QT interval (QTc) fell within the range, 0.36 to 0.42.