This version was machine-translated from German and has not been medically reviewed. The authoritative version is the German version.
ECG reference values
Heart rate, QTc and R amplitude in V6 by age and sex – reference work with classification of your own values
QTc according to Bazett – all age groups
| Age | Boys P2 / P50 / P98 | Girls P2 / P50 / P98 |
|---|---|---|
| under 1 month | 304 / 393 / 455 ms | 349 / 395 / 459 ms |
| 1 month to under 3 years | 342 / 387 / 446 ms | 345 / 390 / 455 ms |
| 3 to under 6 years | 343 / 383 / 431 ms | 356 / 389 / 466 ms |
| 6 to under 12 years | 356 / 388 / 439 ms | 353 / 392 / 455 ms |
| 12 to under 16 years | 342 / 387 / 445 ms | 357 / 392 / 445 ms |
| 16 to 18 years | 335 / 382 / 453 ms | 344 / 394 / 442 ms |
R amplitude in V6 – all age groups
| Age | Boys P2 / P50 / P98 | Girls P2 / P50 / P98 |
|---|---|---|
| under 1 month | 0.16 / 0.67 / 2.03 mV | 0.19 / 0.77 / 1.85 mV |
| 1 month to under 3 years | 0.41 / 1.37 / 2.91 mV | 0.41 / 1.39 / 2.95 mV |
| 3 to under 6 years | 0.66 / 1.56 / 3.46 mV | 0.65 / 1.52 / 3.24 mV |
| 6 to under 12 years | 0.66 / 1.68 / 3.57 mV | 0.72 / 1.59 / 3.20 mV |
| 12 to under 16 years | 0.74 / 1.70 / 3.36 mV | 0.62 / 1.33 / 2.55 mV |
| 16 to 18 years | 0.71 / 1.68 / 2.97 mV | 0.63 / 1.27 / 2.34 mV |
What is different in the pediatric ECG
An infant's ECG is not a small adult ECG: the right ventricle dominates after birth, the cardiac axis is rightward, T waves in the right precordial leads are normally negative in the first years of life, and the rate is high. Normal values are therefore stratified by age; a value that would be abnormal in a ten-year-old can be normal in an infant.
Reference values are statistical ranges of healthy children. Interpreting an ECG is a physician's task.