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Electrocardiography Procedures & Interpretation Flashcards

7 cards from real CCT 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 Procedures & Interpretation flashcards as text

  1. Which of the following rhythms is defined by an atrial rate of 400–600 bpm with an irregularly irregular ventricular response?

    Answer: Atrial fibrillation

    Atrial fibrillation is characterized by chaotic atrial activity at 400–600 bpm with no distinct P waves and a completely irregular ventricular rate.

  2. In left bundle branch block (LBBB), which lead shows a broad monophasic R wave without a septal Q wave?

    Answer: Lead V6

    In LBBB, lead V6 (and lateral leads I, aVL) shows a broad, notched, monophasic R wave with absence of the normal septal Q wave.

  3. A CCT observes a patient's ECG with sudden onset of wide, bizarre QRS complexes at 180 bpm, with AV dissociation. What is the most likely rhythm?

    Answer: Ventricular tachycardia

    Ventricular tachycardia presents with wide, bizarre QRS complexes at ≥100 bpm and AV dissociation (independent P waves and QRS complexes) is a distinguishing feature.

  4. Which ECG finding is most consistent with acute pericarditis?

    Answer: Diffuse concave (saddle-shaped) ST elevation in multiple leads with PR depression

    Acute pericarditis classically shows diffuse, concave (saddle-shaped) ST elevation in nearly all leads with PR segment depression, reflecting global pericardial inflammation.

  5. What electrode placement error causes the ECG to show inverted P waves and QRS complexes in lead I with a positive aVR?

    Answer: Left arm and right arm lead reversal

    Swapping the left arm (LA) and right arm (RA) electrodes causes lead I to be inverted and aVR to appear positive — the mirror image of normal.

  6. Which of the following best defines the J-point on the ECG?

    Answer: The junction between the end of the QRS complex and the beginning of the ST segment

    The J-point marks the junction between the end of the QRS complex and the start of the ST segment, and is the reference for measuring ST elevation or depression.

  7. A patient on telemetry shows P waves that occur at a normal rate but none are followed by QRS complexes. What AV block is present?

    Answer: Third-degree (complete) AV block

    In complete (third-degree) AV block, no atrial impulses conduct to the ventricles; the atria and ventricles beat independently, so no P waves are followed by QRS complexes.