The Q wave is the first downward deflection of the QRS complex that occurs before the R wave. It is normal to have small Q waves in most leads. ... The ECG has some good Q waves in V1-V3, ...

The normal duration (interval) of the QRS complex is between 0.08 and 0.10 seconds — that is, 80 and 100 milliseconds. When the duration is between 0.10 and 0.12 seconds, it is intermediate or ...

Lateral Q waves should not be seen with a LBBB because they also indicate ... but small R waves are seen in the precordial leads and the T waves are normal. ... ECG Challenge: Reflux or a Heart ...

A P wave precedes each QRS complex (+) and the PR interval is stable (0.22 sec). The QT/QTc intervals are slightly prolonged (440/460 msec) but normal when the prolonged QRS complex duration is ...

Each Tuesday, Doctor Rob Riley joins us to answer viewers' medical questions. Here are the questions he addressed on February 28. "Is a physiologic Q-wave something to be concerned about? How can ...

The goal of ECG interpretation in athletes is to classify the ECG as: (1) ‘normal’—no further evaluation needed or (2) ‘abnormal’—further evaluation needed. ... a ‘strain’ pattern of repolarisation, ...

Can ECG be normal during heart attack? "Yes. Whenever a patient comes in with an emergency of a heart attack 70% of the time, the initial ECG is not normal, but in 30% cases the ECG can be normal.