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.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
DIAGNOSTIC
Masking
NONE
Enrollment
220
Measurement of blood pressure during stress testing with cuff device
Measurement of blood pressure during stress testing with iPhone
University Hospital Basel
Basel, Canton of Basel-City, Switzerland
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
Time frame: 1 day
Number of measurement failures
Number of measurements that cannot be analyzed due to bad signal quality of the Photoplethysmography (PPG) signal
Time frame: 1 day
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