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ECG intervals by age

Team DFTB

Written on 29/06/2021
, Last updated 14/10/2021

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Team DFTB

. ECG intervals by age, Don't Forget the Bubbles, 2021. Available at: https://doi.org/10.31440/DFTB.1388

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Age	HR(bpm)	QRS axis (degrees)	PR interval (sec)	QRS interval (sec)	R in V1	S in V1	R in V6	S in V6
1st week	90-160	60-180	0.08-0.15	0.03-0.08	5-26mm	0-23mm	0-12mm	0-10mm
1-3 week	100-180	45-160	0.08-0.15	0.03-0.08	3-21mm	0-16mm	2-16mm	0-10mm
1-2 mo	120-180	30-135	0.08-0.15	0.03-0.08	3-18mm	0-15mm	5-21mm	0-10mm
3-5 mo	105-185	0-135	0.08-0.15	0.03-0.08	3-20mm	0-15mm	6-22mm	0-10mm
6-11 mo	110-170	0-135	0.07-0.16	0.03-0.08	2-20mm	0.5-20mm	6-23mm	0-7mm
1-2 yr	90-165	0-110	0.08-0.16	0.03-0.08	2-18mm	0.5-21mm	6-23mm	0-7mm
3-4 yr	70-140	0-110	0.09-0.17	0.04-0.08	1-18mm	0.5-21mm	4-24mm	0-5mm
5-7 yr	65-140	0-110	0.09-0.17	0.04-0.08	0.5-14mm	0.5-24mm	4-26mm	0-4mm
8-11 yr	60-130	neg 15-110	0.09-0.17	0.04-0.09	0-14mm	0.5-25mm	4-25mm	0-4mm
12-15 yr	65-130	neg 15-110	0.09-0.18	0.04-0.09	0-14mm	0.5-21mm	4-25mm	0-4mm
16 yr and over	50-120	neg 15-110	0.12-0.20	0.05-0.10	0-14mm	0.5-23mm	4-21mm	0-4mm

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