Condition category
Circulatory System
Date applied
Date assigned
Last edited
Retrospectively registered
Overall trial status
Recruitment status
No longer recruiting

Plain English Summary

Background and study aims
Hypertension is the most important risk factor that is closely related to the occurrence, development and deterioration of cardiovascular and cerebrovascular diseases. Therefore, the early diagnosis of hypertension is particularly important. At present, the monitoring of blood pressure can be divided into two modes: invasive and non-invasive blood pressure monitoring. Invasive arterial blood pressure monitoring is currently the "golden standard" for assessing arterial blood pressure, but because of its invasiveness, the complex operation, and the risk of infection and thrombosis, it is only clinically applicable to the monitoring of critically ill patients. At present, the blood pressure diagnosis mode commonly used in clinical practice is a non-invasive hypertension monitoring mode, which is a static and passive diagnosis method. The principles of the monitoring are mostly the Korotkoff sound method and the oscillography method. But those methods have some shortcomings, such as discontinuity and contingency. Photoplethysmography is the most advanced monitoring principle of wearable sphygmomanometer in the world. The test equipment is a pulse wave blood pressure diagnostic device (VITA-D1) based on artificial intelligence. It is non-invasive, easy to operate, and can continuously monitor blood pressure. The device has received the certification of the China Food and Drug Administration (CFDA). This study aims to validate the accuracy and consistency of photoplethysmographic sphygmomanometers (VITA-D1) in order to provide a more comfortable and convenient blood pressure monitoring device

Who can participate?
Patients aged from 25 to 80 and volunteer to participate in this study and sign the informed consent

What does the study involve?
Three hundred participants are allocated to three parts. The patients undergo blood pressure measurement to evaluate the consistency between photoplethysmography pulse wave sphygmomanometer and invasive blood pressure monitoring, mercury sphygmomanometer, 24-hour ambulatory blood pressure measurement respectively

What are the possible benefits and risks of participating?
The main benefit will be to provide an understanding of blood pressure values and prevention, diagnosis and treatment of hypertension for participants. There is no risk of participating in this study

Where is the study run from?
The first affiliated hospital, Sun Yat-Sen University (Guangzhou, China)

When is the study starting and how long is it expected to run for?
November 2019 to May 2020

Who is funding the study?
Investigator and VITA-COURSE Technology CO., LTD funded

Who is the main contact?
Jun Tao

Trial website

Contact information



Primary contact

Prof Jun Tao


Contact details

Department of Hypertension and Vascular Disease
The First Affiliated Hospital of Sun Yat-sen University
No. 58 Zhongshan Second Road
+86 13922191609

Additional identifiers

EudraCT number

Nil known number

Nil known

Protocol/serial number


Study information

Scientific title

Consistency evaluation of non-invasive continuous cuffless blood pressure monitoring based on photoplethysmography compared with invasive blood pressure monitoring, mercury sphygmomanometer and 24-hour ambulatory blood pressure measurement


Study hypothesis

To observe the accuracy of a novel sphygmomanometer (VITA-D1 sphygmomanometer, VITA-Course Technologies CO., LTD.) based on photoplethysmography, in order to provide a more comfortable and convenient blood pressure monitoring device

Ethics approval

Approved 12/09/2019, the Ethics Committee of the First Affiliated Hospital, Sun Yat-Sen University (No. 58 Zhongshan Second Road, Guangzhou, China; +86-020-87755766;, ref: [2019]345

Study design

Diagnositc study

Primary study design


Secondary study design

Cohort study

Trial setting


Trial type


Patient information sheet

Not available in web format, please use the contact details below to request a patient information sheet




Three hundred participants in multiple centers will be enrolled in this study and divided into 3 parts. There are 100 participants in each part. We record the medical history, routine physical examination and a serious of necessary laboratory tests of each participant. All the participants receive blood pressure measurement with photoplethysmographic sphygmomanometers and participants in each group measure their blood pressure with invasive blood pressure monitoring (Part 1), mercury sphygmomanometer (Part 2) and 24-hour ambulatory blood pressure measurement (Part 3), respectively.

Part 1:
Invasive blood pressure monitoring:
A professional doctor takes the right radial artery as the puncture point and inserts the puncture catheter directly into the artery. The invasive blood pressure values are obtained by connecting the pressure measuring tube with the transducer. At the same time, another researcher uses photoplethysmographic sphygmomanometers (VITA-D1) to measure blood pressure in the right index finger. Each participant will be recorded for 2 minutes.

Part 2:
Before measurement:
Within 30 minutes before blood pressure measurement, participants are not allowed to smoke, drink tea or coffee, and should empty the bladder. They should be seated comfortably and relaxed for at least 5 minutes, her/his back and arm supported with the middle of the upper arm at heart level, legs uncrossed, and feet flat on the floor. Talking and any other interference needs to be avoided throughout the entire validation procedure.

Blood pressure measurement with photoplethysmographic sphygmomanometers and mercury sphygmomanometers:
Two researchers use mercury sphygmomanometers with a “Y-type” stethoscope connecting two receivers with a Y-connector and one researcher use photoplethysmographic sphygmomanometers (VITA-D1) to measure the right arm and right index finger blood pressure of the same subject three times, respectively. Each interval is 1-2 minutes. The appropriate length and width of mercury sphygmomanometer cuff is selected according to the arm circumference of the subjects. Blood pressure measurements with mercury sphygmomanometer are expressed by the mean of the measurements of two researchers. If the difference of blood pressure measurement between two researchers is less than 4 mmHg, the mean of two measurement values is taken as the measurements of the observers. If they are larger than 4 mmHg, they need to be re-measured. The measurement value of VITA-D1 is expressed by the mean of the measurement values of a researcher. The results are recorded and analyzed.

Part 3:
24-hour ambulatory blood pressure measurement:
24-hour ambulatory blood pressure measurement is performed on the right upper arm and right index finger with AND Ambulatory Sphygmomanometer and photoplethysmographic sphygmomanometers (VITA-D1) separately. Blood pressure is measured every 30 minutes from 6am to 10pm and every 1 hour from 10pm to 6am.

Intervention type



Not Applicable

Drug names

Primary outcome measure

Mean values, standard deviation and 95% confidence interval of systolic blood pressure, mean blood pressure and diastolic blood pressure between the devices.

Secondary outcome measures

1. Pulse rate oxygen saturation of blood
2. Incidence of health issues and equipment failure following the blood pressure measurement:
2.1. Allergy
2.2. Itch
2.3. Equipment out of action or other failures

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Age from 25 to 80 years old
2. Volunteer to participate in this study and sign the informed consent
3. Requiring arterial blood pressure monitoring
4. Distribution of the blood pressure is in accordance with American National Standards Institute (ANSI)/AAMI/ISO standard revision 2013 (ISO 81060–2:2013).

Participant type


Age group




Target number of participants

We recruited 300 participants for this study (100 for each part).

Participant exclusion criteria

1. Any persistent arrhythmias and/or atrial fibrillation
2. Upper limb fracture, trauma, infection, arteriovenous fistula, etc. that might impact the blood pressure measurement
3. Pacemaker installed
4. Fingers with nail polish or nail painting
5. Uncooperative participants with a disordered PPG curve
6. The other cases that the investigators determine to be unsuitable for participation in the study

Recruitment start date


Recruitment end date



Countries of recruitment


Trial participating centre

The First Affiliated Hospital, Sun Yat-Sen University

Sponsor information


Department of Hypertension & Vascular Disease, The First Affiliated Hospital, Sun Yat-Sen University

Sponsor details

Zhongshan Second Road
+86 13922191609

Sponsor type

Hospital/treatment centre



Funder type


Funder name

Investigator initiated and funded

Alternative name(s)

Funding Body Type

Funding Body Subtype


Funder name


Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

Planned publication in a high-impact peer-reviewed journal.

IPD sharing statement:
All data generated or analysed during this study will be included in the subsequent results publication.

Intention to publish date


Participant level data


Basic results (scientific)

Publication list

Publication citations

Additional files

Editorial Notes

10/01/2020: Uploaded protocol 25 December 2019 (not peer reviewed). 31/12/2019: Trial’s existence confirmed by Ethics Committee of the First Affiliated Hospital, Sun Yat-Sen University.