Final Exam Dysrhythmia
Final Exam Dysrhythmia Study Guide
Review Containing 301 Questions and
Answers/ Already Graded A+ 2024-
2025.
1
, Final Exam Dysrhythmia
First Degree Atrioventricular Heart Block - Answer: prolonged PR interval-
measures the time required for an impulse to travel from the SA to the AV node.
PRI longer than 0.20
Second degree AV block Type I - Answer: progressive prolongation of PRI, gradual
shortening of R-to-R intervals
P wave not followed by a QRS wave
a pause with an R-to-R interval less than the sum of two P to P intervals
first conducted atrial impulse after the pause shows a shorter or normal PRI
Second Degree AV Block Type 2 - Answer: Rhythm: ventricular irregular; atrial
regular
Rate: atrial rate > ventricular rate
P waves: P waves may not be followed by QRS
PRI: WNL or prolonged; PRI before and after a blocked P waves are constant.
QRS duration: WNL; greater than 0.11 sec block occurs below the bundle.
2
, Final Exam Dysrhythmia
characteristics of first-degree AV block - Answer: rhythm: regular
Rate: usually WNL
P waves: one positive before each QRS complex
PRI: prolonged
QRS: normal
causes of first-degree AV block - Answer: - normal in hx of cardiac disease
especially athletes
- Acute MI
- acute myocarditis or endocarditis
- cardiomyopathy
- degenerative fibrosis and sclerosis
- drugs
- hyperkalemia
- increased vagal tone
- ischemia or injury to the AV node or AV bundle
- rheumatic heart disease
- valvular heart disease
3
, Final Exam Dysrhythmia
what causes second degree AV block type I - Answer: RCA, athletes, aortic valve
disease, atrial septal defects, meds, mitral valve prolapse, rheumatic heart
disease.
what do i do about second-degree AV block type I - Answer: atropine for
bradycardia.
second degree AV block type II causes - Answer: MI is related to conduction
effects, acute myocarditis, aortic valve disease, cardiomyopathy, fibrosis of the
conduction system, rheumatic heart disease
second degree AV block type II s/s - Answer: depends on the ventricular rate: if
normal it is asymptomatic. could progress to third degree, pacemakers, ECG, pulse
ox, obtain VS, administer oxygen, est IV access
temporary or permanent pacing
third degree heart block - Answer: Rhythm: ventricular regular; atrial regular, no
relationship is present
4
Final Exam Dysrhythmia Study Guide
Review Containing 301 Questions and
Answers/ Already Graded A+ 2024-
2025.
1
, Final Exam Dysrhythmia
First Degree Atrioventricular Heart Block - Answer: prolonged PR interval-
measures the time required for an impulse to travel from the SA to the AV node.
PRI longer than 0.20
Second degree AV block Type I - Answer: progressive prolongation of PRI, gradual
shortening of R-to-R intervals
P wave not followed by a QRS wave
a pause with an R-to-R interval less than the sum of two P to P intervals
first conducted atrial impulse after the pause shows a shorter or normal PRI
Second Degree AV Block Type 2 - Answer: Rhythm: ventricular irregular; atrial
regular
Rate: atrial rate > ventricular rate
P waves: P waves may not be followed by QRS
PRI: WNL or prolonged; PRI before and after a blocked P waves are constant.
QRS duration: WNL; greater than 0.11 sec block occurs below the bundle.
2
, Final Exam Dysrhythmia
characteristics of first-degree AV block - Answer: rhythm: regular
Rate: usually WNL
P waves: one positive before each QRS complex
PRI: prolonged
QRS: normal
causes of first-degree AV block - Answer: - normal in hx of cardiac disease
especially athletes
- Acute MI
- acute myocarditis or endocarditis
- cardiomyopathy
- degenerative fibrosis and sclerosis
- drugs
- hyperkalemia
- increased vagal tone
- ischemia or injury to the AV node or AV bundle
- rheumatic heart disease
- valvular heart disease
3
, Final Exam Dysrhythmia
what causes second degree AV block type I - Answer: RCA, athletes, aortic valve
disease, atrial septal defects, meds, mitral valve prolapse, rheumatic heart
disease.
what do i do about second-degree AV block type I - Answer: atropine for
bradycardia.
second degree AV block type II causes - Answer: MI is related to conduction
effects, acute myocarditis, aortic valve disease, cardiomyopathy, fibrosis of the
conduction system, rheumatic heart disease
second degree AV block type II s/s - Answer: depends on the ventricular rate: if
normal it is asymptomatic. could progress to third degree, pacemakers, ECG, pulse
ox, obtain VS, administer oxygen, est IV access
temporary or permanent pacing
third degree heart block - Answer: Rhythm: ventricular regular; atrial regular, no
relationship is present
4
