##### Cardiac Lab Exam

What is the normal length of a cardiac cycle?

0.8s

What is the normal length of a P wave?

0.08s

What is happening during the P wave?

atria depolarization

What is the normal length of a QRS segment?

0.12s

What is happening during a QRS segment?

ventricular depolarization

What is the normal length of a QT interval?

0.31-0.41s

What is happening during the QT interval?

all ventricular activity

What is the normal length of the PQ interval?

0.12-0.2s

What is happening during the PQ interval?

SA node fires to the AV node

How do you calculate the average heart rate on an EKG?

measure R wave to R wave x3, 60 divided by the average = bpm, big square 0.2s, small squares 0.04s

If there is no visible P wave what is the expected rhythm?

atrial fibrillation

What is the average tidal volume?

500ml

What is IRV? What is the average?

IRV=inspiratory reserve volume; the amount of air inspired above tidal inhalation; 3200/1900ml

What is ERV? What is the average?

ERV=expiratory reserve volume; the air exhaled beyond tidal exhalation; 1200/700ml

What is the average VC (vital capacity)? How do you determine the VC?

4800/3100ml;VC=TV+ERV+IRV

How do you calculate the inspiratory capacity?

IRV+TV=IC

How do you calculate the IRV?

IRV=IC-TV