What is the typical placement for Lead V5?

Lead V5 is typically placed at the left midaxillary line in the fifth intercostal space. This placement is important for optimal detection of the heart's electrical activity and provides a view that is useful in diagnosing conditions such as myocardial ischemia. The midaxillary line aligns with the left ventricle's electrical impulses, which are particularly significant when assessing heart function during an ECG.

The other options reflect incorrect placements that would not provide the optimal electrical signals needed for effective cardiac monitoring. For example, placing lead V5 at the left sternal border at the fourth intercostal space would not capture the same electrical activity as the midaxillary position, and similarly, the right sternal border position would further mislead the interpretation by positioning it away from the heart’s lateral aspects. Overlaying the sternum would also not provide the required lateral view necessary for accurate assessment. The midaxillary line placement at the fifth intercostal space allows for a more comprehensive evaluation of the heart's activity from a lateral perspective, which is essential in clinical practice.