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Completed

NCT Number: NCT05264090

Possibilities of Interpreting the Night-to-Day Ratio Specified by 24-hour Blood Pressure Monitoring

Specify the risk rate of incorrect patient classification based on night-to-day ratio specification from singular 24-h ABPM in comparison to the results of 7-day ABPM monitoring

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Key information

Conditions

Cardiovascular Diseases Behavior Hypertension Motor Activity Vascular Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

St. Anne´s University Hospital Brno

Brno, 654 91, Czechia

About this study

The subjects in the study are divided into 4 groups:

group 1 (40 healthy men and women without exercise); group 2 (40 healthy exercise-training men and women); group 3 (40 patients with ischemic coronary artery disease without exercise); and group 4 (51 patients with ischemic coronary artery disease following cardiovascular rehabilitation).

The subject of the evaluation is the percentage rate of incorrect subject classification (dipper, non-dipper, extreme dipper, and risers) based on the mean blood pressure values for 7 days and from seven independent 24-hour cycles (the mean value mode).

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Healthy volunteers (without any disease, including the cardiovascular ones, and without any kind of treatment)
  • Patients with chronic ischemic coronary artery disease
  • Patients treated with ACE inhibitors, beta-blockers or statins.
  • To visit routinely in the health centres where the study is carried out

Exclusion criteria

  • Age under 18 years,
  • Pregnant, or breast-feeding,
  • Patients on dialysis or being followed by nephrology,
  • Severe physical or cognitive limitations,
  • Intolerance to the method of measurement

Treatment and study plan

Ambulatory blood pressure monitoring

Other

The ambulatory monitoring (7-day ABPM) was performed with ambulatory blood pressure monitoring devices TM-2430 (A&D; Tokyo, Japan) based on both the cuff-oscillometric and Korotkoff sound method. The cuff was placed on the non-dominant arm according to the same rules applying to casual auscultation measurement. The monitoring device with a weight of 250 g was worn by the monitored subjects in a waist-fixed case continuously for 7 days except for times involving personal hygiene. During every automatic measurement, the arm was resting and hung along the body. The device automatically recorded all the regular measurements for seven days, between 6:00 a.m. and 10:00 p.m. every 30 minutes and between 10:00 p.m. and 6:00 a.m. every 60 minutes. Such short intervals are necessary to obtain a sufficient number of representative measurements.

Combined aerobic-resistance exercise

Other

Combined aerobic-resistance exercise (group 2) was scheduled twice weekly in the form of 60-minute workouts with a load intensity at the level of sub-maximum heart frequency (75-85% SFmax). The minimum time span between the workouts was 24 hours. The workout consisted of a 10-minute warm-up, 25 minutes of aerobic exercise (spinning bicycle or bicycle ergometer), 15 minutes of resistance exercise on gym machines (bench press, leg extension and pull down) with 40-50% 1-RM (one repetition maximum) intensity (3 series of 10 exercises), and a 10-minute cool-down (stretching of the main muscle groups).

The cardiovascular exercise

Other

The cardiovascular exercise (group 4) took the form of sixty-minute workouts scheduled two to three times weekly. The nature of the workouts was similar, combined aerobic-resistance exercise (a 10-minute warm-up, aerobic endurance on bicycle ergo meter for 25 minutes, resistance exercise on multifunctional gym machines for 15 minutes, and a 10-minute cool-down). The workout intensity was set at the level of the first ventilation threshold (VAT-1), corresponding to the following workout parameters: load (W) and heart rate (HR).19,20 The resistance exercise intensity was specified by the 1-RM (one repetition maximum) method. The maximum load lifted across the full range of motion for every exercise was used as the benchmark for the workload intensity specification, corresponding to 30 - 60% 1-RM.

Primary outcomes

  1. The risk rate of incorrect patient classification based on night-to-day ratio specification from singular 24-h ABPM in comparison to the results of 7-day ABPM monitoring.

    Time frame: 1 - 7 days

    Primary outcome was to specify the risk rate of incorrect patient classification based on night-to-day ratio specification from singular 24-h ABPM in comparison to the results of 7-day ABPM monitoring.

    The percentage of blood pressure drop at night expressed by night-to-day ratio (dippers, non-dippers, extreme dippers, reverse dippers) can be specified much more accurately on the basis of 7-day ABPM values. ABPM restricted to 24 h, as currently practiced, does not yield a sufficiently reliable estimate of the night-to-day ratio for a classification in terms of dipping. Extending monitoring to 7 days accounts for the large day-to-day variability in the night-to-day ratio, and may yield a more reliable diagnosis of blood pressure variability.

Secondary outcomes

  1. Optimalization of the blood pressure diagnostic through comparing of 24 hours and 7 days monitoring.

    Time frame: 1 - 7 days

    On the basis of the obtained results, the following procedure can be recommended for clinical practice. If the standard 24-hour monitoring is used, then obtain at least 3 mutually independent 24-hour cycle data for every examined individual. If at least two of them result in the same night-to-day ratio and the third night-to-day ratio is only slightly different, the thus obtained index can be considered trustworthy. Otherwise, the correct night-to-day ratio can only be obtained by 7-day ABPM and, in addition, the resulting night-to-day ratio calculated from the mean values obtained in the course of the 7 days must be compared to the result modes obtained for the individual monitoring days.

    The magnitude of the difference between the evaluation of 24-hour and 7-days blood pressure records was not dependent on the gender, age, health, or cardiovascular disease or physical activity of monitored individuals.

Sponsors and collaborators

Lead sponsor

St. Anne's University Hospital Brno, Czech Republic

Other

Collaborators

  • Masaryk University
  • University of Minnesota

Registry information

Official study title

Seven-day Ambulatory Blood Pressure Monitoring and CAVI in the Prevention of Cardiovascular Diseases

Acronym: ABPM

Important dates

Study start
2018
Primary completion
2020
Study completion
2021
First posted
Mar 3, 2022
Registry last updated
Mar 3, 2022

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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