Final answer:
The expected reference range for the QRS interval on an ECG is typically between 0.06 to 0.10 seconds. This interval reflects ventricular depolarization and is critical for assessing heart rhythm and function.
Step-by-step explanation:
The expected reference range for the QRS interval is typically between 0.06 to 0.10 seconds (60 to 100 milliseconds), indicating the time it takes for the ventricles to depolarize, which is the rapid conveyance of the electrical impulse throughout the ventricles that triggers their contraction and results in the main pumping action of the heart.
The QRS complex is a crucial component of an electrocardiogram (ECG), which also includes the P wave and T wave. Abnormal patterns in the QRS interval can indicate various cardiac issues, such as bundle branch block or ventricular hypertrophy. When there is an increased frequency between QRS complexes, we expect an increased heart rate (pulse), as these are indicative of the heart beating more rapidly.