Where is lead V4 placed on the patient for an electrocardiogram (EKG)?

Where is lead V4 placed on the patient for an electrocardiogram (EKG)?

• A. 3rd Intercostal Space
• B. 5th Intercostal Space
• C. 4th Intercostal Space
• D. 6th Intercostal Space

Answer: (B)

V4 is placed on the left chest at the apex, along the left midclavicular line. This location lines up with the tip of the heart, mainly the left ventricle, so the electrode picks up electrical activity from the anterior-apical region most effectively. If you place it higher up the chest, toward the sternum, you’d shift the view to different heart areas and miss the apex-focused signal V4 is meant to capture. Placing it too far laterally or lower would also change the view and alter the waveform. So the apex position on the left midclavicular line provides the intended window for this lead.

V4 is placed on the left chest at the apex, along the left midclavicular line. This location lines up with the tip of the heart, mainly the left ventricle, so the electrode picks up electrical activity from the anterior-apical region most effectively. If you place it higher up the chest, toward the sternum, you’d shift the view to different heart areas and miss the apex-focused signal V4 is meant to capture. Placing it too far laterally or lower would also change the view and alter the waveform. So the apex position on the left midclavicular line provides the intended window for this lead.