Cardiology Ch 2 Flashcards


Set Details Share
created 1 year ago by nick_madon9
4 views
Monitoring and telemetry
updated 1 year ago by nick_madon9
Subjects:
paramedic
show moreless
Page to share:
Embed this setcancel
COPY
code changes based on your size selection
Size:
X
Show:

1

1 Cardiac cycle

P,Q,R,S,S,T wave

2

1 cardiac cycle is measured from?

Beginning of one P wave to the beginning of the next P wave

3

P wave

-First positive deflection before QRS

- Represents the depolarization of both the right and the left atria

4

Peaked P waves

Enlargement of the right atrium

5

Notched P waves

Enlargement of the left atrium

6

Negative/inverted and absent P waves

Sign of electrical conduction that is initiated from the AV junction

7

Biphasic P waves

Enlargement of both atria's

8

PR interval

The time it takes an electrical impulse to be conducted through the atria and the atrioventricular node before the impulse begins to cause ventricular depolarization.

- Measured from the beginning of the P wave to the next deflection.

- .12-.20 seconds

9

QRS complex

Represents ventricular depolarization or the conduction of an electrical impulse from the bundle of His through the ventricle muscle.

- 0.04-0.12 seconds

10

ST segment

End of the S wave to the beginning of T wave.

- May be elevated or depressed above or below the baseline

- May indicate cardiac problems

11

T wave

Follows the ST segment and indicates the repolarization of the ventricular myocardial cells.

- Either below of above the baseline. Elevated or depressed

12

QT interval

The depolarization and repolarization of the ventricles

- Measured from the beginning of the QRS complex to the end of the T wave.

- A prolonged QT interval indicated a problem within the electrical conduction pathway of the heart

13

Refractory periods

The time between depolarization and the return of the cardiac cells to the ready or polarized state

14

Absolute refractory period

The cardiac cells have not completed repolarization and cannot be stimulated to conduct an electrical impulse and contract again.

- Beginning of the QRS complex through the first half of T wave

15

Relative refractory period

Cardiac cells have repolarized to the point that some cells can be stimulated to depolarize again.

- Measured from the end of the absolute refractory period to the end of the T wave

16

Rate

Number of electrical impulses conducted through the myocardium in 1 minute

17

Atrial rate

Determined by the number of P waves seen

18

Ventricular rate

Determined by the number of R waves

19

Artifact

The interference or static seen on the monitor screen or rhythm strip

- Patient movement or deep, rapid breathing may cause artifact.