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CCT - Certified Cardiographic Technician 12-Lead ECG Interpretation and Cardiac Conditions Questions and Answers Flashcards

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  1. Which leads make up the inferior territory of the heart on a 12-lead ECG?

    Answer: II, III, aVF

    Leads II, III, and aVF face the inferior wall of the left ventricle, which is supplied primarily by the right coronary artery (RCA).

  2. ST elevation in leads V1-V4 combined with a new right bundle branch block most strongly suggests:

    Answer: Anterior MI with septal involvement

    ST elevation in V1-V4 reflects anterior wall STEMI, and a new RBBB can indicate septal involvement, often due to LAD artery occlusion.

  3. What is the hallmark ECG finding of left ventricular hypertrophy (LVH) using the Sokolow-Lyon criterion?

    Answer: S in V1 + R in V5 or V6 > 35 mm

    The Sokolow-Lyon criterion defines LVH as the sum of the S wave in V1 and the tallest R wave in V5 or V6 exceeding 35 mm.

  4. Reciprocal ST changes seen in leads I and aVL during an inferior MI indicate:

    Answer: Reciprocal depression confirming inferior STEMI and its territory

    ST depression in I and aVL is the expected reciprocal (mirror image) change that confirms inferior STEMI in II, III, aVF, helping to rule out pericarditis or artifact.

  5. A 12-lead ECG shows ST elevation in V1-V2, deep S waves in I, and right axis deviation. Which condition does this pattern suggest?

    Answer: Right ventricular hypertrophy (RVH) or strain

    Right axis deviation, tall R in V1, and deep S in lateral leads are classic features of RVH or right ventricular strain, often seen in pulmonary hypertension or PE.

  6. Which ECG pattern is described as diffuse concave ('saddle-back') ST elevation in most leads with PR depression, without reciprocal changes?

    Answer: Pericarditis

    Acute pericarditis causes diffuse concave ST elevation and PR depression (especially in II and aVF) in most leads without the reciprocal depression seen in STEMI.