electrocardiogram ( chapter 11) Flashcards Preview

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Flashcards in electrocardiogram ( chapter 11) Deck (17):
1

P wave

Atrial depolarization

2

QRS complex

ventricle depolarization before contraction

3

T wave

ventricle repolarization

4

Polarization

when the normally negative potential inside the fiber becomes slightly positive and the outside becomes slightly negative

5

Voltage and time calibration in Electrocardiograms

10 horizontal lines are 1 mv. Vertical lines are for time. Every 25 lines is a second

6

Q-R interval

time between beginning of p wave and beginning of QRS complex. This is the interval between the beginning of electrical excitation of the atria and beginning of the excitation of the ventricles. usually about .16 sec.

7

Q-T interval

contraction of the ventricle. Generally about .35 sec.

8

heart rate calculation

Rate is the reciprocal of time interval between 2 successive beats. Normal interval between 2 QRS complexes is .83 so 60/.83= 72 beats per min.

9

what is the last part of the heart that is depolarized?

outer wall of ventricles near the base of the heart

10

how does the current flow in the hear?

from negative to positive from the base to apex

11

what is a bipolar limb lead test?

when two electrodes are placed on different parts of the body and read on a meter.

12

lead 1

negative is on right arm. positive is on left arm.

13

lead 2

negative terminal is on right arm and positive is on left leg

14

lead 3

negative on left arm, positive on left leg

15

Einthovens triangle

an imaginary triangle that connects the 2 arms and the left leg. The points at which the two arms connect electrically with the fluids around the hear. The lower apex is the point at which the left leg connects with the fluids

16

einthovens law

if any two of three leads are known, the third can be determined mathmatically.

17

Augmented unipolar lime leads

When positive terminal is on right arm the lead is aVR, left arm aVL, and left foot aVF. All are positive except aVR which is negative.