ECG in Clinical Practice Flashcards

A patient presents with chest pain and the ECG shows ST-segment elevation in leads II, III, and aVF. Which coronary artery is most likely involved?

Answer: Right coronary artery

Leads II, III, and aVF represent the inferior wall, which is most commonly supplied by the right coronary artery.

When performing a 12-lead ECG, where should the V1 electrode be placed?

Answer: Fourth intercostal space, right sternal border

V1 is placed in the fourth intercostal space at the right sternal border.

A technician notices a wandering baseline on the ECG tracing. What is the most likely cause?

Answer: Patient movement or respiration

A slow, undulating (wandering) baseline is typically caused by patient movement or breathing.

Which of the following best describes atrial fibrillation on an ECG?

Answer: Irregularly irregular rhythm with no distinct P waves

Atrial fibrillation shows an irregularly irregular ventricular response with absent discrete P waves.

What is the standard paper speed for a routine ECG recording?

Answer: 25 mm/second

The standard ECG paper speed is 25 mm per second.

A tall, tented T wave is most classically associated with which electrolyte abnormality?

Answer: Hyperkalemia

Peaked, tented T waves are a hallmark early sign of hyperkalemia.

Before applying electrodes, why is it important to properly prepare the patient's skin?

Answer: To reduce impedance and improve signal quality

Skin prep reduces electrical impedance, improving electrode contact and tracing quality.