EKG certification Certification Cheat Sheet 2026

The 30 highest-yield EKG certification Certification facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which layer of the heart wall is responsible for the contractile force during each heartbeat? → Myocardium
2. On a standard 12-lead EKG, what does a narrow QRS complex (less than 0.12 seconds) indicate about the origin of the rhythm? → The impulse originates above the ventricles
3. What is the ideal breaths-to-compressions ratio during CPR? → 2 breaths to 30 compressions
4. Which EKG morphology is characteristically seen with right ventricular pacing? → Wide QRS complex with left bundle branch block (LBBB) morphology
5. Why is accurate EKG Interpretation & Waveforms essential for patient care? → It is necessary for proper patient diagnosis and care.
6. First-degree heart block PR interval: → Constant and greater than 0.20second in duration
7. In a standard 12-lead EKG, which lead is formed by the combination of leads I and III and does NOT require a separate electrode? → aVF
8. What is the recommended action when somatic tremor artifact is identified on an EKG strip? → Ask the patient to hold their breath and relax muscles, then re-record
9. A wide QRS complex greater than 0.12 seconds with an RSR' pattern in lead V1 is characteristic of which condition? → Right bundle branch block
10. On an EKG, what is the normal duration of the QRS complex? → 0.06 to 0.10 seconds
11. What is the most likely cause of an intermittent or 'dropped' signal on one lead of a 12-lead EKG? → Loose or partially detached electrode on that lead
12. How does EKG Interpretation & Waveforms affect patient outcomes? → It has a long-term impact on improving heart health and preventing complications.
13. Before performing an EKG on a patient in airborne precautions, which action is MOST important for the technician? → Don a fit-tested N95 respirator before entering the room
14. Which of the following describes depolarization of the ventricular muscle? → QRS complex
15. What is the normal duration of the PR interval on an EKG? → 0.12 to 0.20 seconds
16. Which condition is a primary indication for implanting a permanent pacemaker? → Symptomatic third-degree (complete) heart block
17. Which vessel carries oxygenated blood from the heart to the body? → The aorta.
18. Which precordial lead is placed at the fourth intercostal space to the right of the sternum? → V1
19. Where does the R wave exceed the S wave in size? → Lead v4
20. On a standard EKG, how fast does the paper move? → 25 mm/sec
21. On a rhythm strip, the R-R interval measures 25 small boxes. Using the small-box method (1500 ÷ number of small boxes), what is the heart rate? → 60 bpm
22. The typical QRS duration is → <0,10
23. How should single-use EKG electrodes be disposed of after use on a patient with MRSA? → In a biohazard waste container
24. A patient's EKG shows a prolonged PR interval greater than 0.20 seconds with consistent P-to-QRS conduction. What is the most likely diagnosis? → First-degree AV block
25. Where should the V4 precordial lead be placed on the patient's chest? → Left midclavicular line, 5th intercostal space
26. The interventricular septum receives its blood supply primarily from which coronary artery? → Left anterior descending artery
27. In a 12-lead EKG, which leads are considered the inferior leads? → II, III, aVF
28. If the V1 and V2 electrodes are placed too high on the chest, what is the most likely effect on the EKG tracing? → Altered R-wave progression mimicking septal pathology
29. The waveforms in the middle are referred to as what? → Segment
30. Which one of these is not visible on an electrocardiogram? → Presence of asymptomatic blockages in the atria of the Heart