Final Answer:
This EKG lead is best for detecting P waves and sinus rhythm is Lead II.
Step-by-step explanation:
Lead II is commonly used in electrocardiography (EKG or ECG) for monitoring and diagnosing heart conditions. It is derived by placing the positive electrode on the left leg and the negative electrode on the right arm. Lead II provides a good view of the electrical activity in the heart, making it particularly effective for detecting P waves, which represent atrial depolarization, and assessing sinus rhythm, the normal heart rhythm originating from the sinus node.
In clinical settings, Lead II is a standard lead for continuous cardiac monitoring and is often part of the standard 12-lead EKG for a comprehensive assessment of cardiac electrical activity.