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Electrocardiography Flashcards

7 cards from real ACSM 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 flashcards as text

  1. Which of the following correctly describes first-degree AV block?

    Answer: PR interval >0.20 seconds with all P waves conducted

    First-degree AV block is defined by a PR interval consistently greater than 0.20 seconds (one large square), with every P wave followed by a QRS complex.

  2. What ECG pattern is associated with right ventricular strain during exercise?

    Answer: S1Q3T3 pattern with ST changes in right precordial leads

    Right ventricular strain classically produces an S wave in lead I, Q wave in lead III, and T-wave inversion in lead III (S1Q3T3), often with right precordial ST changes.

  3. During exercise testing, at what point past the J-point should ST-segment displacement be measured?

    Answer: 80 ms (2 small squares)

    The standard for measuring exercise-induced ST depression is 80 ms (2 small squares) after the J-point to allow the ST segment to stabilize after the QRS complex.

  4. A patient taking digoxin shows which characteristic ECG finding?

    Answer: Scooped (reversed tick) ST-segment depression

    Digoxin produces a characteristic 'scooped' or reversed-tick ST-segment depression, especially in lateral leads, which is a normal therapeutic finding distinct from ischemia.

  5. Which finding on a resting ECG would be an absolute contraindication to initiating an exercise stress test?

    Answer: Uncontrolled ventricular tachycardia

    Uncontrolled ventricular tachycardia is an absolute contraindication to exercise testing because exercise could precipitate ventricular fibrillation.

  6. The Bazett formula is used to calculate which ECG measurement?

    Answer: Corrected QT interval (QTc)

    The Bazett formula (QTc = QT / √RR) corrects the QT interval for heart rate, allowing comparison across different heart rates.

  7. In a 12-lead ECG, which leads are considered the lateral leads?

    Answer: I, aVL, V5, V6

    The lateral leads (I, aVL, V5, V6) face the lateral wall of the left ventricle and are used to detect lateral wall ischemia or LVH voltage criteria.