SYSTOLIC TIME INTERVAL Meaning and
Definition
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Systolic Time Interval (STI) refers to a physiological parameter that is used to measure the duration of various events within the cardiac cycle. It specifically focuses on the time intervals associated with the onset and completion of ventricular contraction or systole.
During each cardiac cycle, the heart goes through a series of mechanical and electrical events that enable it to effectively pump blood throughout the body. Systolic Time Interval helps in quantifying and understanding these events.
The STI is typically measured using electrocardiogram (ECG) and phonocardiogram (PCG) recordings. It involves the analysis of specific waveforms and intervals detected in these recordings. The main parameters calculated using STI include pre-ejection period (PEP) and left ventricular ejection time (LVET).
PEP represents the period from the onset of ventricular depolarization to the opening of the aortic valve, while LVET reflects the duration of ventricular contraction and the time taken for blood to be pumped out from the left ventricle.
Systolic Time Interval has important clinical implications, as it can provide insights into cardiac function, myocardial performance, and autonomic nervous system dynamics. Abnormalities in STI values may indicate cardiovascular diseases, such as heart failure or ischemic heart disease. Additionally, STI can be used to assess the effects of various medications, therapies, or interventions on cardiac function. It serves as a valuable tool for evaluating and monitoring cardiovascular health both in clinical and research settings.
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