Clinical Usefullness of the Cuffless SOMNOtouch NIBP Device for 24-hour Ambulatory Blood Pressure Measurement

Study Overview
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Brief Summary
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The SOMNOtouch NIBP is a cuffless device for continuous blood pressure measurement. The device is widely used, but validation for 24-hour ambulatory blood pressure measurement (ABPM) is limited. This study seeks to validate the SOMNOtouch device for use in 24-hour ABMP as compared to a validated oscillometric device for 24-hour ABPM. A total of 60 patients with indication for 24-hour BP measurement will be recruited from our tertiary hypertension Clinic. All included patients will conduct dual 24-hour ABPM with both the SOMNOtouch NIBP and a the oscillometric device. Furthermore, patients will undergo measurement of arterial stiffness with a Sphygmocor device as well as complete a questionaire on device related discomfort.

Detailed Description
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Recruitment of study participants: A total of 60 patients with indication for 24-hour BP measurement will be recruited from our tertiary hypertension clinic at Aarhus University Hospital, Aarhus, Denmark. Patients will be eligible for inclusion if they are 18 years or older and have indication for ABPM with an automated oscillometric device. Exclusion criteria will be as follows: Known significant arterial abnormalities in the upper extremities, known cardiac arrythmia, upper arm circumference >16,5 or <6, or extreme uncontrolled hypertension (i.e. resting office BP > 230/140 mmHg). To enable testing of the device at both normal and elevated BP-levels, we will aim at including at least 15 patients in each of the following categories: Normal BP, stage 1 hypertension and stage ≥2, based on NICE guidelines for ABPM17. Informed consent will obtained from all patients prior to inclusion in the study. At inclusion, a simultaneous bilateral BP-measurement will be performed with three consecutive measurements using an automated oscillometric device (Microlife WatchBP Office®) after 5 minutes of rest. If the difference in Systolic Blood Pressure (SBP) between the arms is found to be >5 mmHg, the patient will not be included in the study. 24-hour BP measurements: All staff related to the project are familiar with the SOMNOtouch NIBP™ (SomBP) device, which has been used in our clinic for selected patients with high cuff-based BP and at the same time symptoms of hypotension, since 2015. Mounting and calibration of both devices will be conducted according to manufacturers' instructions. With the patient sitting in an upright position with back-support, a conventional oscillometric BP-device (Spacelabs 90217 / 90207, OscBP) will be fitted on the right arm, while the SomBP will be fitted on the left arm. The SomBP will be calibrated with a single BP measurement with a cuff-based sphygmomanometer. The OscBP will record BP three times every hour during daytime and two times every hour during nighttime, while the SomBP will measure BP continuously. The patients will be instructed to engage in normal activities but refrain from strenuous exercise and, at the time of cuff-inflation, to stop moving and talking, while keeping the arm still with the cuff at heart level. Pulse wave velocity (PWV) as well as pulse wave analysis (PWA) will be performed in duplicate with the SphygmoCor system (version 8.2, Atcor Medical, Sydney, Australia). A small questionnaire on device-related pain and/or discomfort as well as sleeping habits will be provided to all participants. As per ESH guidelines, a minimum of 70% useful measurements on the oscillometric device during the ABPM will be required for the data to be considered useful. Assessment the acceptability of data-quality of SomBP will be made on the basis of discussion between the primary investigator and KLC, who, at the time of evaluation will both be blinded to the corresponding OscBP measurement. No SomBP measurements will be accepted with more than 50% failed measurement in the report. Data from both devices will be excluded from the study if data-collection from either device is deemed to have insufficient quality to be usable. For these instances, patients will be asked to repeat examination with both devices. SomBP1 data will extracted ad hoc using Domino Light 1.4.0 software. Statistical analysis: All statistical analysis will be performed using STATA software. A p-value of 0.05 will be prespecified as statistically significant. Variables will be checked for distribution through histograms and QQ-plots. Means will be compared using paired t-test. Standard regression analysis will be performed to test for association in continuous variables. Categorical variables will be compared using chi-squared tests.

Official Title
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Clinical Usefullness of the Cuffless SOMNOtouch NIBP Device for 24-hour Ambulatory Blood Pressure Measurement

Conditions
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Arterial Hypertension

Intervention / Treatment
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* Device: Dual 24-hour ABPM


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Indication for ABPM with an automated oscillometric device Exclusion Criteria: Known significant arterial abnormalities in the upper extremities Known cardiac arrythmia Upper arm circumference >16,5 or <6, or Extreme uncontrolled hypertension (i.e. resting office BP > 230/140 mmHg).

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Other: Ambulatory blood pressure measurement<br>Dual 24-hour ABPM with both the SOMNOtouch NIBP and a validated oscillometric 24-hour ABPM-device (SPACELABS 90217 / 90207). | Device: Dual 24-hour ABPM<br>* Dual 24-hour ABPM with both the SOMNOtouch NIBP and a validated oscillometric 24-hour ABPM-device (SPACELABS 90217 / 90207).<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Difference in blood pressure averages between SOMNOtouch NIBP and SPACELABS 90217 / 90207 during 24-hour ABPM | in mmHg | During 24-hour ABPM | 
| Difference in mean systolic blood pressure between SOMNOtouch NIBP and SPACELABS 90217 / 90207 during 24-hour ABPM on the patient level | Bland Altman plots will be used to evaluate accuracy. | During 24-hour ABPM | 
| Difference in mean diastolic blood pressure between SOMNOtouch NIBP and SPACELABS 90217 / 90207 during 24-hour ABPM on the patient level | Bland Altman plots will be used to evaluate accuracy. | During 24-hour ABPM | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The impact of aortic augmentation index normalized to a Heart frequency of 75 beats/minute on BP Measurements with either device. | As measured using the SphygmoCor-device | Aortic augmentation index will be measured prior to 24-hour ABPM. | 
| The impact of pulse wave velocity on BP Measurements with either device. | As measured using the SphygmoCor-device | Pulse Wave velocity will be measured prior to 24-hour ABPM. | 
| Patient satisfaction with SOMNOtouch device compared with the oscillometric device. | As judged based on standardized questionaire. | Immediately after completion om 24-hour ABPM. | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Ambulatory blood pressure measurement