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EKG Basics Flashcards

7 cards from real PCT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which EKG wave represents ventricular repolarization?

    Answer: T wave

    The T wave represents ventricular repolarization, when the ventricles reset electrically after contracting.

  2. In a standard 12-lead EKG, how many chest (precordial) leads are included?

    Answer: 6

    A 12-lead EKG includes 6 limb leads (I, II, III, aVR, aVL, aVF) and 6 precordial leads (V1–V6).

  3. What does a prolonged QT interval indicate?

    Answer: Increased risk of dangerous ventricular arrhythmias

    A prolonged QT interval indicates delayed ventricular repolarization, which increases the risk of torsades de pointes and ventricular fibrillation.

  4. Where is lead V1 placed on the patient's chest?

    Answer: Right 4th intercostal space, sternal border

    V1 is placed at the 4th intercostal space along the right sternal border.

  5. A heart rate of 40 bpm on an EKG is classified as:

    Answer: Bradycardia

    Bradycardia is defined as a heart rate below 60 bpm; 40 bpm falls well below this threshold.

  6. Which lead is considered the best for detecting P waves and is used as the rhythm strip?

    Answer: Lead II

    Lead II is parallel to the P wave axis and shows the clearest, most upright P waves, making it ideal for rhythm analysis.

  7. On EKG graph paper, how many seconds does one large box represent at standard paper speed?

    Answer: 0.20 seconds

    At the standard paper speed of 25 mm/sec, each large box (5 mm) represents 0.20 seconds.