Electrocardiography (ECG/EKG) Techniques Flashcards

A CVT is asked to perform a right-sided ECG. Where should V4R be placed?

Answer: 5th intercostal space, right midclavicular line

V4R mirrors the standard V4 placement on the right side of the chest: 5th intercostal space at the right midclavicular line.

During sinus rhythm, the normal PR interval range in adults is:

Answer: 0.12–0.20 seconds

A normal PR interval is 0.12 to 0.20 seconds (3–5 small boxes), reflecting normal AV nodal conduction time.

ST elevation in leads II, III, and aVF with reciprocal ST depression in I and aVL suggests occlusion of which artery?

Answer: Right coronary artery

Inferior MI (ST elevation in II, III, aVF) is most commonly caused by right coronary artery (RCA) occlusion in right-dominant patients.

Which precordial lead position is placed at the left anterior axillary line at the same horizontal level as V4?

Answer: V5

V5 is placed at the anterior axillary line at the same horizontal level as V4 and V6.

A patient presents with a narrow-complex tachycardia at 150 bpm. P waves are hidden within the T waves. The most likely diagnosis is:

Answer: Atrial flutter with 2:1 block

Atrial flutter typically presents at 150 bpm with 2:1 AV block, causing flutter waves to be partially buried in T waves.

What does the T wave on an ECG represent?

Answer: Ventricular repolarization

The T wave represents ventricular repolarization, during which the ventricular myocardium recovers its resting membrane potential.

When a patient cannot lie flat for a standard ECG, which modification should the technician make?

Answer: Place the patient in left lateral decubitus and note position on the tracing

When a patient cannot lie supine, the semi-recumbent or lateral position is used and documented on the tracing to alert interpreting clinicians.