iPhone App Compared to Standard Riva-Rocci (RR)-Measurement During Stress Testing

Study Overview
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Brief Summary
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The iPARR DELTA BP Study is designed to evaluate whether a new smartphone app using the photoplethysmography signal of the inbuilt camera can measure blood pressure (BP) fluctuations with sufficient correlation compared to the goldstandard oscillometric BP measurements. Investigators will recruit patients who are scheduled for a routine treadmill stress test and assess their blood pressure before and right after the test with the smartphone app and the standard BP measurements on the opposite upper extremity. Pronounced BP fluctuations are encountered during vigorous activities. The primary endpoint of the iPARR DELTA BP Study is the correlation of the absolute difference of subsequent measurements between both techniques. If the relative chances of BP fluctuations are sufficiently assessed with this new device, BP fluctuations could be monitored continuously after calibration.

Official Title
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iPhone App Compared to Standard RR-measurement During Stress Testing

Conditions
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Blood Pressure

Intervention / Treatment
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* Device: cuff device
* Device: iphone


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: - able to give informed consent Exclusion Criteria: atrial fibrillation medical reasons why blood pressure measurement is not possible at the upper extremity (Shunt, Lymphedema)

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 99 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

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 |
| --- | --- |
| Experimental: Blood pressure measurement<br>six repetitive blood pressure measurements with iPhone and conventional oscillometric cuff device during stress testing will be performed | Device: cuff device<br>* Measurement of blood pressure during stress testing with cuff device<br>Device: iphone<br>* Measurement of blood pressure during stress testing with iPhone<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Absolute difference between conventional blood pressure measurements and the corresponding iPhone blood pressure estimations | Difference between the delta of two sequential oscillometric measurements and the delta of the two corresponding blood pressure estimates calculated from the PPG signal of an iPhone 4S | 1 day | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Number of measurement failures | Number of measurements that cannot be analyzed due to bad signal quality of the Photoplethysmography (PPG) signal | 1 day | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Blood pressure, smartphone App, Hypertension, Stress testing, Prevention, Cardiovascular risk factors