EKG MEDCA Exam Questions and
Answers
standard leads - Answer-Leads 1,2,3
Augmented leads - Answer-aVF, aVR, aVL
What leads look at the inferior part of the heart? - Answer-Lead 2, Lead 3 and aVF
What leads look at the left lateral part of the heart? - Answer-Lead 1 and Lead aVL
what leads loo...
Where is lead 3 placed? - Answer✔✔-positive electrode on L-leg and negative electrode on R-
arm
which one is the reference? - Answer✔✔-right leg electrode
where is V1? - Answer✔✔-right of sternum, 4th intercostal space
where is V2? - Answer✔✔-L- of sternum, 4th intercpstal space
where is V3? - Answer✔✔-inbetween V2 and V3
where is V4? - Answer✔✔-Midclavicular line, 5th intercostal space
where is V5? - Answer✔✔-anterior axillary line between V4 and V6
Where is V6? - Answer✔✔-midaxillary line, 5th intercostal space
1mV =___mm - Answer✔✔-10mm
1mm=__sec - Answer✔✔-.04 seconds
P-wave - Answer✔✔-shows atrial depolarization, lasts .08-.1sec, amplitude of less than .25mV
PR interval - Answer✔✔-shows the beginning of the p wave(onset of atrial depolarization) lasts
.12-.20sec
PR segment - Answer✔✔-end of atrial depolarization and beginning of ventricular
depolarization
QRS complex - Answer✔✔-displays time needed for depolarization of ventricles, lasts .04-.12sec
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