<Li> R + S in a precordial lead <4.5 mV </Li> <Li> R in V5 or V6 <2.6 mV </Li> <Tr> <Td> Ventricular activation time (VAT) </Td> <Td> <Ul> <Li> <0.05 s in V5 or V6 </Li> <Li> <0.03 s in V1 </Li> </Ul> </Td> <Td> </Td> <Td> Measured in increased QRS amplitude </Td> </Tr> <Ul> <Li> <0.05 s in V5 or V6 </Li> <Li> <0.03 s in V1 </Li> </Ul>

What does the qrs in an ecg represent