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Effect of treatment on systolic time intervals in systemic arterial hypertension
Insights
Systolic time intervals (STI) detect early left ventricular dysfunction in hypertensive patients before other methods. STI also helps assess treatment effectiveness in managing hypertension-related heart changes.
Area of Science:
- Cardiology
- Physiology
Background:
- Hypertension can lead to left ventricular dysfunction and hypertrophy.
- Early detection of cardiac changes in hypertension is crucial for timely intervention.
Purpose of the Study:
- To investigate the utility of systolic time intervals (STI) in detecting early left ventricular dysfunction in hypertensive patients.
- To assess the role of STI in monitoring treatment response.
Main Methods:
- Systolic time intervals (STI) were measured in 26 hypertensive patients and 25 healthy controls.
- Comparison of STI parameters (PEP, PEP/LVET ratio) between groups.
- Assessment of left ventricular performance changes after treatment.
Main Results:
- Hypertensive patients showed altered STI, indicating left ventricular dysfunction, prior to clinical signs of left ventricular hypertrophy (LVH).
- Prolonged pre-ejection period (PEP) and increased PEP/LVET ratio were observed in hypertensives.
- Left ventricular performance improved with treatment in patients without LVH.
Conclusions:
- STI serves as a sensitive indicator of early left ventricular dysfunction in hypertension.
- STI can be a valuable tool for assessing treatment efficacy when other non-invasive methods are less sensitive.
Abstract:
Twenty-six hypertensive patients and 25 control subjects were studied, and their systolic time intervals (STI) were measured. It was found that an alteration in STI, signifying left ventricular dysfunction, sets in most of the hypertensives earlier than any evidence of left ventricular hypertrophy (LVH) by clinical, radiological or electrocardiographic criteria. The parameters affected are the PEP interval which shows prolongation and PEP/LVET ratio which is increased. After treatment, the left ventricular performance was found to improve in those who did not reveal evidence of LVH. Thus, STI may be a sensitive indicator of early left ventricular dysfunction in hypertensives and a useful guide to assess improvement after treatment at a stage when other non-invasive methods are not so useful.