Static testing
Stable, resting conditions in a supine position against the clinical gold standard.
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Clinical data
Clinically Validated at
Sri Jayadeva Institute.
A comprehensive clinical evaluation of the V-CHEK cuffless blood pressure monitoring device in Bengaluru, India.
250
Patients evaluated
18–80
Age range
0.959
SBP correlation (r)
0.949
DBP correlation (r)
Study overview
Accuracy Against the Clinical Gold Standard.
V-CHEK was evaluated at the Sri Jayadeva Institute of Cardiovascular Sciences and Research to assess the accuracy and reliability of blood pressure, heart rate and SpO₂ measurement against the mercury-based sphygmomanometer and hospital-grade pulse oximeters.
Prospective, observational cross-sectional study
250 patients with cardiovascular conditions
Diamond mercurial sphygmomanometer comparator
Bland–Altman & Pearson analysis
Demographics
Patient Clinical Characteristics.
The trial was designed to test the device across a diverse patient population, with over 80% admitted hospital inpatients monitored in a controlled environment.
Average age 51.55 ± 13.06 years
56.4% male (141) · 43.6% female (109)
154 with hypertension (avg. 6.3 years)
105 with diabetes (avg. 8.5 years)
Baseline metrics
Standard instrument averages
| Metric | Baseline average |
|---|---|
| Systolic BP (SBP) | 122.78 ± 20.35 mmHg |
| Diastolic BP (DBP) | 79.35 ± 12.11 mmHg |
| Pulse Rate (PR) | 80.36 ± 13.18 bpm |
| Oxygen Saturation (SpO₂) | 97.23 ± 1.59% |
Methodology
Testing Across Three Conditions.
Phase 1 established baseline accuracy with 24 subjects using Mean Absolute Difference (MAD). Once MAD criteria were met, Phase 2 proceeded with the remaining 226 subjects.
Dynamic postural testing
Inducing natural BP variation (supine to standing) to achieve a >4 mmHg change from calibration.
Longitudinal stability
Testing at least 6 hours post-calibration to validate long-term stability and algorithm ageing.
Results
Device Accuracy & Agreement.
Bland-Altman plots assessed measurement validity and estimated bias with 95% confidence intervals.
| Metric | Estimated bias (95% CI) | Outside limit of agreement | Pearson correlation |
|---|---|---|---|
| Systolic BP (SBP) | -0.377 mmHg (-0.758 to 0.004) | 3.6% | 0.959 |
| Diastolic BP (DBP) | 0.773 mmHg (0.516 to 1.031) | 4.6% | 0.949 |
| Pulse Rate (PR) | -0.078 bpm (-0.253 to 0.098) | 5.4% | 0.982 |
| Oxygen Saturation (SpO₂) | -0.173% (-0.243 to -0.103) | 4.3% | 0.808 |
Conclusion
Highly comparable to a traditional sphygmomanometer.
The trial confirms that the V-CHEK cuffless monitor provides daytime blood pressure, heart rate and SpO₂ measurements during resting conditions that are highly comparable to traditional sphygmomanometers.
The negligible biases and strong correlation coefficients validate its clinical utility as an accessible, non-invasive tool for continuous BP assessment and hypertension management.
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