Cardio10 Flashcards
ECG tracings AV block ANP
ECG tracing characteristics of Atrial fibrillation.
- Chaotic, erratic baseling (irregularly irregular)
- No discrete P waves in between irregularly spaced QRS complexes
What can A Fib result in?
Atrial stasis –> Stroke
What are the treatments for A fib?
Rate control
Anticoagulation
Cardioversion (possibly)
ECG tracing characteristics of Atrial flutter.
- Rapid succession of identical, back-to-back atrial depolarization waves
- “Sawtooth” appearance
Pharmacologic conversion to:
- Sinus rhythm
- Rate control
Sinus rhythm: - class IA, IC, or III antiarryhythmics
Rate control:
- beta-blocker
- Ca++ channel blocker
ECG tracing characteristics of Ventricular fibrillation.
Completely erratic rhythm with no identifiable waves
*Fatal w/o immediate CPR & defibrillation
1st degree AV block.
PR interval is prolonged (>200 msec)
*Asymptomatic
2nd degree AV block: Mobitz type I (Wenckebach)
Progressive lengthening of the PR interval untial a beat is “dropped”
-P wave no follwed by a QRS complex
*Usually asymptomatic
2nd degree AV block: Mobitz type II
- Dropped beats that are NOT preceded by a change in the length of the PR interval (as in type I)
- Abrupt, nonconducted P waves
*Pathologic condition
3rd degree AV block (complete).
- Atria & Ventricles beat independently of eachother
- Both P waves and QRS complexes are present
- P waves bear no relation to the QRS complexes
T/F - The atrial rate is faster than the ventricular rate.
True
What is the treatment for 3rd degree AV block?
Pacemaker
What condition can result in 3rd degree AV block?
Lyme disease
What triggers the release of Atrail Natriuretic Peptide (ANP) from atrial myocytes?
INcreased blood volume
INcreased atrial pressures
Function of ANP.
- Generalized vascular relaxation
- DEcreased Na+ reabsorption at the medullary collecting tubules
