Practice Test Geeks(CET) Certified Electrocardiogram Technician Practice Test
← All CET Flashcard Decks

Lead Placement & Recording Procedures Flashcards

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

Read the first 7 Lead Placement & Recording Procedures flashcards as text

  1. Which lead is considered the 'ground' or reference electrode in a standard 12-lead ECG setup?

    Answer: Right leg (RL)

    The right leg (RL) electrode serves as the electrical ground or reference and does not contribute to any of the 12 leads.

  2. V4 is placed at the:

    Answer: Fifth intercostal space, left midclavicular line

    V4 is positioned at the fifth intercostal space at the midclavicular line, typically over the cardiac apex.

  3. When a technician notices AC (60 Hz) interference on the ECG tracing, the first corrective step should be:

    Answer: Check and correct electrode connections and skin contact

    AC interference usually results from poor electrode contact or nearby electrical equipment; checking connections and skin preparation resolves it without altering the signal.

  4. In right-sided ECG leads (V3R–V6R), where is V4R placed?

    Answer: Mirror image of V4 on the right chest at the fifth ICS, right midclavicular line

    V4R is the right-side mirror of V4, placed at the fifth intercostal space on the right midclavicular line, critical for detecting right ventricular MI.

  5. A patient's left arm is in a cast. Which adjustment is appropriate for the LA electrode?

    Answer: Place the LA electrode as high on the left arm as possible above the cast

    The electrode should be placed on the most distal accessible portion of the same limb to maintain anatomical consistency of the limb lead system.

  6. The sensitivity (gain) setting of 10 mm/mV means:

    Answer: 1 mV of cardiac signal produces a 10 mm deflection on the ECG paper

    Standard sensitivity is 10 mm/mV, so a 1 mV calibration pulse deflects the stylus exactly 10 mm (two large squares).

  7. Which of the following is the correct sequence for placing precordial leads from V1 to V6?

    Answer: Right sternal border → Left sternal border → Between V2 and V4 → Midclavicular → Anterior axillary → Midaxillary

    V1 (right sternal 4th ICS) → V2 (left sternal 4th ICS) → V3 (between V2 and V4) → V4 (5th ICS midclavicular) → V5 (anterior axillary) → V6 (midaxillary, same level as V4/V5).