Final answer:
The best leads for detecting P waves and sinus rhythm on an ECG are Lead II, Lead V1, and Lead V2.
Step-by-step explanation:
The best leads for detecting P waves and sinus rhythm on an ECG are Lead II, Lead V1, and Lead V2.
In Lead II, the positive electrode is placed on the right leg and the negative electrode on the left arm. The P waves in Lead II are typically upright and clear, making it a good lead for detecting abnormal P wave morphology.
In Lead V1 and V2, the positive electrode is placed on the right side of the sternum and the negative electrode on the left arm. These leads are located close to the right atrium and are therefore ideal for detecting changes in the P wave associated with atrial enlargement or conduction abnormalities.