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Electrocardiography and Cardiac Monitoring Flashcards

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

Read the first 7 Electrocardiography and Cardiac Monitoring flashcards as text

  1. What does the P wave on an ECG represent?

    Answer: Atrial depolarization

    The P wave reflects the electrical impulse that spreads through the atria causing atrial depolarization and contraction.

  2. The QRS complex on an ECG represents which cardiac event?

    Answer: Ventricular depolarization

    The QRS complex reflects the rapid spread of the electrical impulse through the ventricles, causing ventricular depolarization and contraction.

  3. What is the normal range for heart rate in sinus rhythm?

    Answer: 60–100 bpm

    Normal sinus rhythm is defined as a regular rhythm originating from the sinoatrial node with a rate between 60 and 100 beats per minute.

  4. How many electrodes are placed on a patient for a standard 12-lead ECG?

    Answer: 10

    A 12-lead ECG uses 10 electrodes—4 limb electrodes and 6 precordial (chest) electrodes—to produce 12 views of the heart's electrical activity.

  5. The T wave on an ECG represents which cardiac event?

    Answer: Ventricular repolarization

    The T wave reflects ventricular repolarization—the recovery phase of the ventricles as they reset for the next contraction.

  6. Which is the correct placement for the V1 precordial lead?

    Answer: 4th intercostal space, right sternal border

    V1 is placed at the 4th intercostal space along the right sternal border, making it the first chest lead closest to the right side of the heart.

  7. What is the standard paper speed used when recording an ECG?

    Answer: 25 mm/sec

    The standard paper speed for ECG recording is 25 mm/sec, meaning each small square (1 mm) represents 0.04 seconds in time.