caa a22 4500 388116269 CHVBK 20180307125407.0 cr unu---uuuuu 161130e199911 xx s 000 0 eng 10.1017/S1047951100005588 doi S1047951100005588 pii (NATIONALLICENCE)cambridge-10.1017/S1047951100005588 Normal values of signal-averaged electrocardiographic parameters and QT dispersion in infants and children [Elektronische Daten] Ventricular late potentials, and dispersion of the QT interval, are markers for risk of ventricular arrhythmias. Normal values for these parameters are well established in adults, but may not apply for children. This study has investigated the age dependency of signal averaged electrocardiographic parameters and QT dispersion in 111 normal children aged from 5 days to 16 years. The results indicate that parameters change with age: duration of filtered QRS and low amplitude (< 40 μV) terminal signal increase with age, especially in the younger patients. Filtered QRS is 88.9 ± 7.87 ms in infants, and increases to 108.7 ± 8.51 in teenagers (p<0.001). Low amplitude terminal signals are 17.0 ± 3.44 ms in infants, and 24.5 ± 5.64 ms in teenagers (p< 0.001). Root mean square of the last 40 ms decreases with age, but remains stable after the age of 10 years (122.4 ± 33.30 μV in infants, 60.9 ± 31.27 in teenagers,p<0.001). QT dispersion, on the other hand, does not change significantly with age. The mean value for the whole group is 36 ± 13.7 ms. A weak but significant correlation exists between QT dispersion and filtered QRS. Thus, age must be taken into consideration when interpreting signal-averaged electrocardiograms, but not when measuring QT dispersion. Copyright © Cambridge University Press 1999 QT dispersion nationallicence signal-averaged electrocardiogram nationallicence arrhythmias in the young nationallicence Vialle Emmanuelle Hôpital cantonal universitaire, Unit of Pediatric Cardiology, Geneve, Switzerland Albalkhi Rim Hôpital cantonal universitaire, Unit of Pediatric Cardiology, Geneve, Switzerland Zimmerman Marc Hôpital cantonal universitaire, Unit of Pediatric Cardiology, Geneve, Switzerland Friedli Béat Cardiology Division, Geneve, Switzerland Cardiology in the Young Cambridge University Press 9/6(1999-11), 556-561 1047-9511 9:6<556 1999 9 CTY https://doi.org/10.1017/S1047951100005588 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1047951100005588 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Vialle Emmanuelle Hôpital cantonal universitaire, Unit of Pediatric Cardiology, Geneve, Switzerland NATIONALLICENCE 700 1- Albalkhi Rim Hôpital cantonal universitaire, Unit of Pediatric Cardiology, Geneve, Switzerland NATIONALLICENCE 700 1- Zimmerman Marc Hôpital cantonal universitaire, Unit of Pediatric Cardiology, Geneve, Switzerland NATIONALLICENCE 700 1- Friedli Béat Cardiology Division, Geneve, Switzerland NATIONALLICENCE 773 0- Cardiology in the Young Cambridge University Press 9/6(1999-11), 556-561 1047-9511 9:6<556 1999 9 CTY CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge