University:
West Coast University
Course:
NURS 110 | Introduction to Professional Nursing
Academic year:

2021
Views:

70

Pages:

1
Author:

Nehemiah Rojas

1st Degree AV Block Rate: Varies depending on the underlying rhythm PRI:  .20 sec QRS:  .12 QT: < .40 May be longer with slower heart rates. Rhythm: Atrial and Ventricle regular Source of pacer: SA Node Characteristics: First-degree AV block is simply a delay in passage of the impulse from atria to ventricles. Unlike its name (which can be confusing), first-degree AV block is not an actual “block,” but rather a delay in conduction. This conduction delay usually occurs at the level of the AV node. Remember that in normal sinus rhythm, the time LWWDNHVWKH6$QRGHWRILUHGHSRODUL]HWKHDWULDDQGWUDQVPLWWRWKH$9QRGHLVVHFRQGV,QILUVWGHJUHH$9 EORFNWKHSDWLHQWKDVD35LQWHUYDORIVHFRQGV,IWKHSDWLent’s underlying rhythm is sinus bradycardia, but the PR interval is .24 seconds, the interpretation would be “sinus bradycardia with a first-degree AV block.” Causes: Acute inferior MI, right ventricular infarction, increased vagal tone, ischemic heart disease, digitalis toxicity, beta-blockers, amiodarone, calcium channel blockers, electrolyte imbalances, rheumatic heart disease or myocarditis. Nursing Priorities: Observe for lengthening PR intervals or development of more serious heart blocks. Potential Treatment: Treatment for first-degree heart block is usually unnecessary as it is typically, asymptomatic. Treatment typically aims to correct the underlying cause. Consult with physician if PR interval is lengthening. Discuss holding medications which slow A-V conduction.