<Li> <0.05 s in V5 or V6 </Li> <Li> <0.03 s in V1 </Li> <Tr> <Td> Q wave </Td> <Td> <Ul> <Li> Duration up to 0.04 seconds in leads other than III and aVR </Li> <Li> Amplitude less than 1 / 3 QRS amplitude (R + S) </Li> <Li> Amplitude less than 1 / 4 of R wave </Li> </Ul> </Td> <Td> </Td> <Td> Abnormality indicates presence of infarction </Td> </Tr> <Ul> <Li> Duration up to 0.04 seconds in leads other than III and aVR </Li> <Li> Amplitude less than 1 / 3 QRS amplitude (R + S) </Li> <Li> Amplitude less than 1 / 4 of R wave </Li> </Ul>

In a qrs complex if the first wave is up what type of wave is it