A cardiologist asks for measurement of electromechanical systole (QS2) and left ventricular ejection time (LVET), and pre-ejection period (PEP). The cardiologist is informed by the technician that the carotid transducer is not functioning. Which of the following readings could not be obtained

Electromechanical systole (QS2)- Time interval between the beginning of Q wave and beginning of the second heart sound. It requires ECG and phonocardiogram. Left ventricular ejection time (LVET)- Interval between the beginning of carotid pressure to the dicrotic notch. Requires carotid pulse tracing. Pre-ejection systole (PEP)- Difference between QS2 and LVET.