Advanced Arrhythmias Questions And Answers

How long is a small box on an ECG rhythm strip? - Answer- 0.04 seconds How long is a big box (5 small boxes) on an ECG rhythm strip? - Answer- 0.2 seconds How many boxes on an ECG rhythm strip is = to 1 second? - Answer- 5 big boxes What does the P wave represent? - Answer- atrial depolarization What does the QRS complex represent? - Answer- ventricular depolarization What does the T wave represent? - Answer- ventricular repolarization What does a U wave indicate? - Answer- Possible hypokalemia What does the QT interval represent? - Answer- the total time required for ventricular depolarization and repolarization How long should the PR interval be? - Answer- 3-5 small boxes (.12-.20 seconds) How long should QRS complex be? - Answer- less than 0.12 seconds (3 little boxes) What does ST segment elevation indicate? - Answer- myocardial infarction What does ST segment depression indicate? - Answer- myocardial ischemia How long should the QT interval be? - Answer- less than half of the R-R interval What is sinus arrhythmia? - Answer- everything is within normal limits on EKG except the R-R interval is variable What is the treatment for symptomatic sinus bradycardia? (And Sinus Exit Block) - Answer- -oxygen -atropine -pacemaker may be required What is the dosing for atropine given for bradycardia? - Answer- 0.5 mg, repeat every 3-5 minutes up to 3 mg