Which of the following should you use first in an attempt to stop severe external bleeding?

You assess an unresponsive 65-year-old man and find that he is apneic and pulseless. The patient's wife tells you that he has an automatic implanted cardioverter/defibrillator. After initiating CPR, you should:

A) deactivate the implanted defibrillator by running a magnet over it. B) apply the AED as soon as possible and analyze his cardiac rhythm. C) ask the wife why and when he had the automatic defibrillator implanted. D) avoid using the AED because the implanted defibrillator is more effective.

Which of these statements about how sinus arrhythmia differs from wandering atrial pacemaker is TRUE?

A) Sinus arrhythmia has a heart rate of less than 100; wandering atrial pacemaker has a rate greater than 100. B) Sinus arrhythmia is lethal; wandering atrial pacemaker is benign. C) Sinus arrhythmia has uniform P wave shapes; wandering atrial pacemaker has at least three different shaped P waves. D) Sinus arrhythmia has a regular rhythm; wandering atrial pacemaker is irregular.