Chapter 36 Nursing Management: Dysrhythmia Flashcards Preview

Term 6: Medical Surgical 4 > Chapter 36 Nursing Management: Dysrhythmia > Flashcards

Flashcards in Chapter 36 Nursing Management: Dysrhythmia Deck (27):
1

Key Terms:

asystole, p. 795

represents the total absence of ventricular electrical activity

2

Key Terms:

atrial fibrillation, p. 796

a cardiac dysrhythmia characterized by a total disorganization of atrial electrical activity without effective atrial contraction.

3

Key Terms:

atrial flutter, p. 795

an atrial tachydysrhythmia identified by recurring, regular, sawtooth-shaped flutter waves.

4

Key Terms:

automatic external defibrillator (AED), p. 802

XX

5

Key Terms:

cardiac pacemaker, p. 803

an electronic device used to increase the heart rate in severe bradycardia by electrically stimulating the heart muscle.

6

Key Terms:

complete heart block, p. 798

third-degree atrioventricular heart block in which no impulses from the atria are conducted to the ventricles.

7

Key Terms:

dysrhythmias, p. 787

XX

8

Key Terms:

premature atrial contraction (PAC), p. 794

contraction originating from an ectopic focus in the atrium in a location other than the sinus node.

9

Key Terms:

premature ventricular contraction (PVC), p. 799

a contraction originating in an ectopic focus in the ventricles.

10

Key Terms:

telemetry monitoring, p. 790

XX

11

Key Terms:

ventricular fibrillation (VF), p. 800

a severe derangement of the heart rhythm characterized on electrocardiogram (ECG) by irregular undulations of varying contour and amplitude.

12

Key Terms:

ventricular tachycardia (VT), p. 799

a condition that occurs when an ectopic focus or foci fire repetitively and the ventricle takes control as the pacemaker.

13

Automaticity

Ability to initiate an impulse spontaneously and continuously

14

Excitability

Ability to be electrically stimulated

15

Conductivity

Ability to transmit an impulse along a membrane in an orderly manner

16

Contractility

Ability to respond mechanically to an impulse

17

P Wave

0.06-0.12 seconds

Represents time for the passage of the electrical impulse through the atrium causing atrial depolarization (contraction). Should be upright.

18

PR Interval

0.12-0.20 seconds

Measured from beginning of P wave to beginning of QRS complex. Represents time taken for impulse to spread through the atria, AV node and bundle of His, bundle branches, and Purkinje fibers, to a point immediately preceding ventricular contraction.

19

QRS Complex

Q wave

<0.03 seconds

First negative (downward) deflection after the P wave, short and narrow, not present in several leads.

20

QRS Complex

R wave

First positive (upward) deflection in the QRS complex.

21

QRS Complex

S wave

First negative (downward) deflection after the R wave.

22

QRS Interval

<0.12 seconds

Measured from beginning to end of QRS complex. Represents time taken for depolarization (contraction) of both ventricles (systole).

23

ST Segment

0.12 seconds

Measured from the S wave of the QRS complex to the beginning of the T wave. Represents the time between ventricular depolarization and repolarization (diastole). Should be isoelectric (flat).

24

T Wave

0.16 seconds

Represents time for ventricular repolarization. Should be upright.

25

QT Interval

0.34-0.43 seconds

Measured from beginning of QRS complex to end of T wave. Represents time taken for entire electrical depolarization and repolarization of the ventricles.

26

Sinus bradycardia

The conduction pathway is the same as that in sinus rhythm but the SA node fires at a rate less than 60 beats/minute

27

Symptomatic bradycardia

Refers to an HR that is less than 60 beats/minute and is inadequate for the patient's condition, causing the patient to experience symptoms (e.g., chest pain, syncope).