Related Experiment Videos
Reproducibility of blood pressure measurements
1Istituto Scientifico Ospedale S. Luca, Fondazione Centro Auxologico Italiano, Milan, Italy.
Insights
Clinic blood pressure readings show lower reproducibility than 24-hour ambulatory monitoring. Averaging multiple standardized clinic readings offers a reproducible alternative for blood pressure assessment.
Area of Science:
- Cardiology
- Hypertension Research
- Clinical Measurement
Background:
- Clinic blood pressure (BP) readings exhibit lower reproducibility compared to 24-hour ambulatory BP monitoring.
- Factors contributing to lower clinic BP reproducibility include daily BP variability, the 'white-coat' effect, and methodological issues like observer bias.
- Higher reproducibility of 24-hour and daytime BP averages is partly due to a larger number of measurements.
Purpose of the Study:
- To compare the reproducibility of clinic blood pressure readings with ambulatory blood pressure monitoring.
- To explore alternative methods for achieving reproducible blood pressure measurements in clinical settings.
- To discuss the implications for clinical trials evaluating antihypertensive drug effects.
Main Methods:
- Comparison of reproducibility between clinic BP readings and 24-hour/daytime ambulatory BP monitoring.
- Analysis of factors influencing BP measurement reproducibility.
- Evaluation of averaging multiple standardized clinic BP readings as an alternative method.
Main Results:
- Clinic BP readings are less reproducible than 24-hour and daytime ambulatory BP.
- The 24-hour average BP is more reproducible than specific components of the 24-hour BP profile (e.g., hourly values, day-night difference).
- Averaging 20-25 standardized clinic BP readings provides a reproducible alternative to ambulatory monitoring.
Conclusions:
- Standardized, averaged clinic BP measurements offer a reproducible alternative to ambulatory monitoring.
- Findings impact the design and interpretation of clinical trials assessing antihypertensive drug efficacy on BP control.
- Optimizing BP measurement techniques is crucial for accurate assessment in hypertension management.
Abstract:
Clinic blood pressure readings are less reproducible than 24 h and daytime average ambulatory blood pressures. This may depend on (1) the continuous and spontaneous variability which characterizes daily life blood pressure, (2) the well-known 'white-coat' effect and (3) other methodological problems affecting traditional sphygmomanometric readings, such as the observer's bias and digit preference. The higher reproducibility of average 24 h and daytime blood pressures is also, at least in part, a function of the greater number of blood pressure readings available. On the other hand, the various components of the 24 h blood pressure profile appear, in general, to be less reproducible than the 24 h average value. This is the case for hourly values, for the day-night blood pressure difference and for a number of statistical parameters employed for modelling the 24 h blood pressure curve. An alternative and simple way to obtain reproducible blood pressure values, without making use of ambulatory blood pressure monitoring techniques, may be offered by the average of 20-25 blood pressure readings obtained automatically or semi-automatically under standardized conditions in outpatient clinics. The implications of these findings for clinical trials aimed at evaluating the features of the effects of antihypertensive drugs on 24 h blood pressure are discussed.