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Methodological variation in systolic time intervals.

J Mustonen, M Uusitupa, K Selkäinaho

    Clinical Physiology (Oxford, England)
    |April 1, 1984
    PubMed
    Summary
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    Systolic time intervals (STI) measurement variation was assessed in male students. Methodological variations were smaller than physiologic variations, indicating reliable STI measurements for clinical use.

    Area of Science:

    • Cardiology
    • Medical Measurement
    • Physiology

    Background:

    • Systolic time intervals (STI) are crucial indicators of cardiac function.
    • Accurate and reliable measurement of STI is essential for clinical diagnosis and monitoring.
    • Understanding measurement variability is key to interpreting STI data.

    Purpose of the Study:

    • To determine the intra- and interobserver variability in measuring systolic time intervals (STI).
    • To compare methodological variation with physiologic variation in STI measurements.
    • To assess the reliability of STI measurements in a student cohort.

    Main Methods:

    • Systolic time intervals (STI) were recorded six times for 12 male students.
    • All 72 recordings were measured twice by a physician and once by two nurses.

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  • Intra- and interobserver variations were calculated for measured (QS2-interval, LVET) and calculated STI parameters.

    • Main Results:

    • Methodological variation for measured parameters (QS2-interval, LVET) was less than 2%.
    • Variation for calculated parameters was larger but not statistically significant.
    • Methodological variation was found to be smaller than physiologic variation.
    • Internal consistency was nearly perfect for measured and slightly lower for calculated parameters.

    Conclusions:

    • The study demonstrates low methodological variation in STI measurements.
    • Measured STI parameters exhibit high reliability and internal consistency.
    • STI measurements are reliable for clinical application due to minimal observer error compared to natural physiological changes.