Hypertension Clinical Trial
Official title:
Sensitivity, Specificity, and Positive and Negative Predictive Values of Automatic Office Blood Pressure Measurement and Traditional Office Blood Pressure Measurement in a Chinese Population
NCT number | NCT03454178 |
Other study ID # | CUHK-188 |
Secondary ID | |
Status | Completed |
Phase | |
First received | |
Last updated | |
Start date | June 30, 2018 |
Est. completion date | December 29, 2019 |
Verified date | September 2020 |
Source | Chinese University of Hong Kong |
Contact | n/a |
Is FDA regulated | No |
Health authority | |
Study type | Observational |
Background: Traditional office blood pressure (BP) measurement is often inaccurate and is
inferior to out-of-office measurements, such as ambulatory blood pressure monitoring (ABPM),
in predicting cardiovascular outcomes. A relatively new BP measurement method, called
Automatic Office Blood Pressure measurement (AOBP), may provide similar BP readings to ABPM
(latest clinical gold standard for BP measurements) and can easily be conducted in clinics.
AOBP machines measure BP repeatedly 3-5 times with 1-min intervals and automatically provide
the mean BP value. While AOBP was used in landmark trials (e.g. SPRINT trial) and was shown
to eliminate white-coat effect, AOBP is rarely used in Hong Kong partly because there is no
data concerning the accuracy of AOBP in Chinese. Almost all previous AOBP research used BpTRU
(AOBP model), but BpTRU manufacturer was shut down permanently.
Aim: To assess if WatchBP Office (another AOBP model) has superior diagnostic accuracy than
traditional office BP measurements, when compared to ABPM readings.
Method: 150 Chinese adult patients with a diagnosis of essential hypertension will be
recruited consecutively from a Government-funded primary care clinic. All patients will have
their BP measured by a 48-hour ABPM, a WatchBP office, and two traditional office blood
pressure measurements.
ABPM will be considered the gold standard; sensitivity, specificity, positive and negative
predictive values of AOBP and traditional BP to diagnose elevated BP level, masked
hypertension and white-coat hypertension will be calculated and compared
Implication: if WatchBP provides closer BP readings to ABPM, this can lead to its
implementation in routine clinical practice
Status | Completed |
Enrollment | 149 |
Est. completion date | December 29, 2019 |
Est. primary completion date | December 29, 2019 |
Accepts healthy volunteers | No |
Gender | All |
Age group | 18 Years and older |
Eligibility |
Inclusion Criteria: - diagnosis of essential hypertension Exclusion Criteria: - (i) severe hypertension as defined by clinical systolic BP =180 mmHg and/or diastolic BP =110 mmHg (because they may need emergency treatment and it is unethical to delay such treatment due to the proposed project), (ii) inability to provide consent, (iii) pregnancy, (iv) night-time occupations (we need to compare AOBP and clinic BP readings to daytime ABPM average when the patient should be awake), (v) are occupational drivers (because potential dangers in driving could occur when patients are asked to remain still), (vi) receiving anti-coagulants (to prevent bruises when using ABPM), (vii) with known atrial fibrillation (as ABPMs and AOBP use have not been validated in this group) |
Country | Name | City | State |
---|---|---|---|
Hong Kong | Lek Yuen Clinic | Hong Kong |
Lead Sponsor | Collaborator |
---|---|
Chinese University of Hong Kong |
Hong Kong,
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | compare BP readings from AOBPs, ABPM, and traditional office BP | mean difference of systolic BP (SBP) and diastolic BP (DBP) between AOBP machines (WatchBP Office, BpTRU)/office BP and daytime ABPM will be compared by the two-tailed t-test; A Bland-Altman type plot will be shown for both comparisons. Pearson correlations will be used to compare mean readings of office BP, AOBP and daytime ABPM. | 1 year | |
Secondary | sensitivity/specificity, positive and negative predictive value of AOBP vs traditional BP measurement | sensitivity/specificity, positive and negative predictive value of diagnosing elevated BP, masked hypertension, and white-coat hypertension of AOBP and office BP will be compared using ABPM as the gold standard | 1 year |
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