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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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Blood pressure measurement | Experimental | six repetitive blood pressure measurements with iPhone and conventional oscillometric cuff device during stress testing will be performed |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| cuff device | Device | Measurement of blood pressure during stress testing with cuff device |
|
| 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 |
| 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 |
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Inclusion Criteria:
- able to give informed consent
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Jens Eckstein, MD, PhD | University Hospital, Basel, Switzerland | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University Hospital Basel | Basel | Canton of Basel-City | 4031 | Switzerland |
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| ID | Term |
|---|---|
| D006973 | Hypertension |
| ID | Term |
|---|---|
| D014652 | Vascular Diseases |
| D002318 | Cardiovascular Diseases |
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| iphone | Device | Measurement of blood pressure during stress testing with iPhone |
|