Which action should be included in the care plan for a female client undergoing a 12-lead ECG?

Instructing the client to remain still during a 12-lead ECG is crucial for obtaining accurate readings. Movement can create artifacts on the ECG tracing, leading to misinterpretation of the heart's electrical activity. The test measures the electrical signals of the heart, and even slight movements of the patient can distort these signals, potentially resulting in an incorrect diagnosis or inaccurate assessment of the heart's condition.

Maintaining stillness allows for clear and precise readings, which are essential for the healthcare provider to evaluate the heart's function effectively. Accurate recordings are critical, especially when monitoring for conditions such as arrhythmias, ischemia, or other cardiac concerns.

Other actions, such as holding breath, encouraging movement, or applying lotion, can negatively impact the test's outcome. Holding the breath could introduce variability in the heart rate, while movement would directly affect the quality of the ECG tracing. Applying lotion can interfere with the electrode's adherence to the skin, potentially hindering signal quality. Thus, the correct action is to instruct the client to remain still during the test to ensure optimal results.