{"id":"ekg-free","timeLimitSec":300,"questions":[{"id":"ekgf-001","section":"safety","q":"While you remove the electrodes, the patient asks whether the EKG shows a heart attack. What is the best reply?","options":["I can see a problem, so you should go to the emergency room right now.","Your tracing looks completely normal, so there is nothing to worry about.","The provider will review the tracing and go over the results with you.","I am not allowed to tell you anything at all about your visit today."],"answer":2,"explain":"Interpreting an EKG and giving results is outside an EKG technician's scope of practice. Refer the question to the provider without guessing or alarming the patient."},{"id":"ekgf-002","section":"acquisition","q":"Where is lead V1 placed?","options":["5th intercostal space at the left midclavicular line","2nd intercostal space at the right sternal border","4th intercostal space at the left sternal border","4th intercostal space at the right sternal border"],"answer":3,"explain":"V1 goes in the 4th intercostal space just to the right of the sternum. V2 is its mirror image on the left side."},{"id":"ekgf-003","section":"analysis","q":"On a strip at 25 mm/s with a regular rhythm, there are 20 small boxes between two R waves. What is the heart rate (1500 method)?","options":["60 beats per minute","75 beats per minute","150 beats per minute","100 beats per minute"],"answer":1,"explain":"Divide 1500 by the number of small boxes between R waves: 1500 / 20 = 75. The 1500 method works only for regular rhythms."},{"id":"ekgf-004","section":"acquisition","q":"The baseline of a tracing looks thick and fuzzy with small, very regular spikes. An electric bed and a fan are plugged in next to the patient. What artifact is this?","options":["60-cycle (AC) interference","Interrupted baseline","Wandering baseline","Somatic tremor artifact"],"answer":0,"explain":"Regular, fine spikes that make the baseline look thick come from alternating current in nearby equipment. Unplug what is not needed and keep cables away from power cords."},{"id":"ekgf-005","section":"analysis","q":"The PR interval gets longer with each beat until a P wave is not followed by a QRS, and then the pattern starts again. Which rhythm is this?","options":["Second-degree AV block, Mobitz type I (Wenckebach)","First-degree AV block","Second-degree AV block, Mobitz type II","Third-degree (complete) AV block with a slow escape rhythm"],"answer":0,"explain":"Progressive lengthening of the PR interval until a beat is dropped is Mobitz type I (Wenckebach). In Mobitz type II the PR stays the same before the dropped beat."}]}