EKG Exam 1 Questions With Verified Answers

Which heart rhythm is characterized by the following: P waves and QRS are firing on their own (they are disassociated) Slow ventricular rate. - Answer 3rd degree heart block Normal PR interval? - Answer 0.12-0.20 Normal QRS? - Answer 0.04-0.12 This heart rhythm changes with inspiration - Answer Sinus arrhythmia Rhythm characterized by a sawtooth pattern on EKG - Answer Atrial flutter Any rate that is > 150 = - Answer Supraventricular tachycardia (SVT) When does PVC become pathologic? - Answer When there are more than 6/minute Which heart rhythm is characterized by the following: Normal sinus rhythm that pauses for a little and then resumes back to normal sinus rhythm - Answer Sinus pause How many PVC's in a row make ventricular tachycardia? - Answer 3 in a row = V tach What is the difference between ventricular tachycardia and supraventricular tachycardia? - Answer The difference is in how wide the QRS is In SVT, the QRS complex is shorter (< 0.4) In VT, it is a little wider QRS greater than 0.12 is characteristic of: - Answer Bundle branch block What suggests the diagnosis of SVT rather than V tach? - Answer SVT has a QRS < 0.14 (it would have a more narrow QRS than VT) What is the difference between Torsades and ventricular fibrillation? - Answer Torsades is more marked than ventriuclar fibrillation 1st degree AV block is characterized by: - Answer PR interval greater than 0.2 Ion responsible for SA and AV node depolarization - Answer Calcium Ion that initiates myocyte depolarization - Answer Sodium An early beat with no P wave is: - Answer Premature junctional beat What is the rate for sinus tachycardia? - Answer 100-150 What is the difference between atrial fibrillation and atrial flutter? - Answer In A fib - no distinct P waves, QRS = irregularly spaced The capacity of a single cell to generate action potential sponatneously - Answer Automaticity Right bundle branch block looks like: - Answer Bunny ears Left bundle branch block looks like: - Answer Swoop