Final answer:
Patients should not hold their breath during an ECG recording.
Step-by-step explanation:
The statement "Patients should not hold their breath during the brief seconds necessary to record an ECG" is True.
When recording an electrocardiogram (ECG), it is important for patients to remain calm and avoid additional movements or changes in breathing. Holding one's breath can affect the heart rate, rhythm, and overall quality of the ECG recording. By staying relaxed and maintaining normal breathing, accurate ECG results can be obtained.