<prompt> 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 obtainedQS2QS2 and LVETQS2 and PEPLVET and PEP  <response>: 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. 