7 ECG Abnormalities Flashcards
List sites a abnormal supra-ventricular rhythms may arise
- Sinus node
- Atrium
- AV node
How are supra-ventricular rhythms conducted into the ventricles?
His-Purkinje system
What are QRS complexes like in supra-ventricular rhythms?
Narrow
In ventricular rhythms what are the QRS complexes like?
Larger than 3 small boxes
What is sinus bradycardia and tachycardia?
B = below 60 T = Above 100
What is the most common cardiac arrhythmia?
Atrial fibrillation
In AF where are electrical impulses initiated from?
Different sites in the atrium called ectopic sites
How does AF present on an ECG?
- Absent P waves
- Wavy baseline
- Narrow QRS complex
- Irregularly irregular
What are the most common complications of atrial fibrillation?
Blood clots arising in the atria
What is heart block?
Block in the electrical conducting system between the atria and the ventricles
What are common causes of heart block?
Acute myocardial infacrtion
What is 1st degree AV heart block?
Prolonged PR interval, but every P wave is still followed by a QRS complex
PR interval is bigger than 1 PR square
What is 2nd degree AV heart block?
Atria are contracting normally but not every impulse from the atria is making it through to the ventricles
What is Mobitz type 1?
progressive PR lengthening until one P wave is not conducted
What is Mobitz type 2?
The PR interval is normal, but then get a sudden non conduction of a beat