ECG intervals by age


Share on facebook
Share on twitter
Share on linkedin
Share on whatsapp
AgeHR(bpm)QRS axis (degrees)PR interval (sec)QRS interval (sec)R in V1S in V1R in V6S in V6
1st week90-16060-1800.08-0.150.03-0.085-26mm0-23mm0-12mm0-10mm
1-3 week100-18045-1600.08-0.150.03-0.083-21mm0-16mm2-16mm0-10mm
1-2 mo120-18030-1350.08-0.150.03-0.083-18mm0-15mm5-21mm0-10mm
3-5 mo105-1850-1350.08-0.150.03-0.083-20mm0-15mm6-22mm0-10mm
6-11 mo110-1700-1350.07-0.160.03-0.082-20mm0.5-20mm6-23mm0-7mm
1-2 yr90-1650-1100.08-0.160.03-0.082-18mm0.5-21mm6-23mm0-7mm
3-4 yr70-1400-1100.09-0.170.04-0.081-18mm0.5-21mm4-24mm0-5mm
5-7 yr65-1400-1100.09-0.170.04-0.080.5-14mm0.5-24mm4-26mm0-4mm
8-11 yr60-130neg 15-1100.09-0.170.04-0.090-14mm0.5-25mm4-25mm0-4mm
12-15 yr65-130neg 15-1100.09-0.180.04-0.090-14mm0.5-21mm4-25mm0-4mm
16 yr and over50-120neg 15-1100.12-0.200.05-0.100-14mm0.5-23mm4-21mm0-4mm

About the authors


High flow therapy – when and how?

Chest compressions in traumatic cardiac arrest

Searching for sepsis

The missing link? Children and transmission of SARS-CoV-2

Don’t Forget the Brain Busters – Round 2

An evidence summary of Paediatric COVID-19 literature


The fidget spinner craze – the good, the bad and the ugly

Parenteral Nutrition