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. 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
8. 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
9. On an EKG, what is the normal duration of the QRS complex? → 0.06 to 0.10 seconds
10. 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
11. How does EKG Interpretation & Waveforms affect patient outcomes? → It has a long-term impact on improving heart health and preventing complications.
12. Which of the following describes depolarization of the ventricular muscle? → QRS complex
13. What is the normal duration of the PR interval on an EKG? → 0.12 to 0.20 seconds
14. Which condition is a primary indication for implanting a permanent pacemaker? → Symptomatic third-degree (complete) heart block
15. Which vessel carries oxygenated blood from the heart to the body? → The aorta.
16. Which precordial lead is placed at the fourth intercostal space to the right of the sternum? → V1
17. Where does the R wave exceed the S wave in size? → Lead v4
18. The typical QRS duration is → <0,10
19. How should single-use EKG electrodes be disposed of after use on a patient with MRSA? → In a biohazard waste container
20. 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
21. Where should the V4 precordial lead be placed on the patient's chest? → Left midclavicular line, 5th intercostal space
22. The interventricular septum receives its blood supply primarily from which coronary artery? → Left anterior descending artery
23. In a 12-lead EKG, which leads are considered the inferior leads? → II, III, aVF
24. 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
25. The waveforms in the middle are referred to as what? → Segment
26. Which one of these is not visible on an electrocardiogram? → Presence of asymptomatic blockages in the atria of the Heart
27. Classic Myocardial Infarction (MI) ECG alterations include → All of the above
28. What is the target heart rate formula most commonly used to determine adequate stress during an exercise stress test? → 220 minus the patient's age
29. In a 12-lead EKG, ST elevation in leads II, III, and aVF indicates ischemia in which coronary artery territory? → Right coronary artery
30. Which EKG finding is characteristic of Wolff-Parkinson-White (WPW) syndrome? → Delta wave with shortened PR interval