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Repeat variation of electrocardiogram, blood pressure, and blood cholesterol within one hour and six months
Insights
This study assessed the stability of electrocardiograms (ECG), blood pressure, and cholesterol in healthy men over six months. ECG measurements showed greater variability over longer periods compared to blood pressure and cholesterol.
Area of Science:
- Cardiology
- Clinical Physiology
- Biomarker Stability
Background:
- Understanding the intraindividual variation of physiological measurements is crucial for accurate health assessments.
- The stability of electrocardiogram (ECG) parameters, blood pressure, and serum cholesterol over time needs to be well-defined for reliable monitoring.
Purpose of the Study:
- To quantify and compare the intraindividual repeat variation of the 12-lead ECG, blood pressure, and blood cholesterol in healthy middle-aged men.
- To determine the influence of short-term (one hour) versus longer-term (six months) intervals on measurement variability.
Main Methods:
- 27 healthy middle-aged men participated in the study.
- Measurements of 12-lead ECG, blood pressure, and serum cholesterol were repeated at one-hour and six-month intervals.
- Intraindividual variation was analyzed using the coefficient of variation and intraclass correlation.
Main Results:
- Significant variation was observed in 7 out of 17 analyzed ECG items over six months compared to one hour.
- Blood pressure exhibited similar variation within one hour and six months.
- Serum cholesterol showed significantly greater intraindividual variation over the six-month period.
- The electrocardiogram demonstrated higher overall intraindividual variation than blood pressure or cholesterol.
- No significant covariation was found between ECG items and blood pressure or cholesterol levels.
Conclusions:
- Electrocardiogram measurements exhibit greater variability over longer time intervals (six months) compared to shorter intervals (one hour) for certain parameters.
- Blood pressure and cholesterol levels also show temporal variations, with cholesterol being more variable over six months.
- The findings highlight the differential stability of these common physiological markers, impacting their utility in longitudinal health monitoring.
Abstract:
The intraindividual repeat variation of the conventional 12-lead electrocardiogram, of blood pressure, and of blood cholesterol was determined in 27 middle-aged healthy men with an interval of one hour and six months. In 7 of 17 analysed electrocardiographic items the variation within six months was significantly greater than that within one hour; in 10 items, the variation was not significantly different. Blood pressure varied as much within one hour as within six months, while the intraindividual variation of serum cholesterol was significantly greater for the six-month period. The intraindividual variation, expressed as the coefficient of variation, was greater for the electrocardiogram than for either blood pressure or cholesterol. There were large differences between various electrocardiographic items in the repeat variation. There was high intraclass correlation of most items analysed, but no significant covariation between electrocardiographic item vs. blood pressure or cholesterol.