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Blood Pressure Follow-up Study in Two Chinese Cohorts(C-BPCS) (C-BPCS)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
 
ClinicalTrials.gov Identifier: NCT02734472
Recruitment Status : Unknown
Verified September 2017 by First Affiliated Hospital Xi'an Jiaotong University.
Recruitment status was:  Recruiting
First Posted : April 12, 2016
Last Update Posted : October 2, 2017
Sponsor:
Information provided by (Responsible Party):
First Affiliated Hospital Xi'an Jiaotong University

Study Description
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Brief Summary:
Essential hypertension is a complex trait which results from interaction between environmental factors and genetic factors. The aim of this study is to investigate the effects of interaction between environmental factors and genetic factors on long-term blood pressure (BP) based on two established cohorts including "the cohort of Hanzhong adolescent hypertension study" and "the cohort of Mei county adult salt-sensitive hypertension study". Firstly, the Hanzhong cohort-based follow-up study is designed to observe the track of BP during the whole life time, and to explore the effects of many risk factors (such as salt-sensitivity, obesity et al) on long-term BP and the occurrence of hypertension, and also to analyze the relationship of different polymorphisms of sodium and potassium metabolism-related gene with BP changes and target organ damages. In addition, by using DNA samples collected from subjects of "Mei county adult salt-sensitive hypertension study"in which all participants had completed a chronic salt loading and potassium intervention trial, we attempt to examine the single nucleotide polymorphisms (SNPs) of sodium and potassium metabolism-related genes, as well as the relationship between these SNPs and BP responses to dietary sodium/potassium intervention, long-term BP change, the risk of hypertension and target organ damages were analyzed. This study would enable us to further explore the etiology of essential hypertension as well as to identify new genetic markers for predicting early hypertension and target organ damage.

Condition or disease Intervention/treatment
Hypertension Other: Incidence and risk factors of hypertension

Detailed Description:
This study is a longitudinal cohort follow-up study. The main contents include:(1)Questionnaire design: questionnaire is designed according to the research contents and purposes. The standard questionnaires will be used to collect the general information, dietary habits, lifestyle, medical history and family history etc.(2)Anthropometric measurements: blood pressure, height, body weight,waist and hip, pulse will be acquired by medical practitioners who received professional trainings based on World Health Organization (WHO) standards, and passed relevant examinations.(3) Blood and urine samples collection: morning fasting blood, nocturia, and 24-hour urine specimen will be collected by medical staffs, and blind tubes will be set up according to 5% of the total samples. Blood biochemistries including serum total cholesterol, HDL cholesterol, LDL cholesterol, triglycerides, fasting glucose, creatinine and hsCRP can be measured using automatic biochemical analyzer. The sodium and potassium concentrations in the urine will be measured by flame photometry. The total sodium and potassium excretions in urine in 24h were calculated by multiplying the concentration and 24-h volume of urine. (4) Auxiliary examinations: Auxiliary examinations including carotid intima-media thickness, endothelium-dependent vasodilation (FMD), measurements of brachial-ankle pulse wave velocity (baPWV) and electrocardiographic parameters. The measurement will be done in hospitals by medical practitioners who received professional trainings and passed relevant examinations. (5) Single nucleotide polymorphisms detection: based on our previous studies, sodium and potassium metabolism-related gene polymorphisms will be detected using MassARRAY technology. (6) Data processing and statistics: we should input the data to the database, and utilize softwares such as SPSS, STATA, Haploview and FBAT to analyze. (7) Quality control: ① Questionnaire is strictly designed and amended by epidemiologist and clinical experts. ② A standardized "Investigator Handbook" will be stipulated according to the guidelines. ③ Staff members are required to do a rigorous training and pass the exam. ④ The investigation process will be strictly supervised by the principal investigator. ⑤ Data entry use the parallel double entry method. ⑥ During laboratory testing, blank control and blind detection are applied to ensure the quality. ⑦ Data analysis is performed by 2-3 postgraduates, inconsistent data need to be double checked.
Study Design
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Study Type : Observational
Estimated Enrollment : 5298 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: Effect of the Interaction Between Environmental Factors and Genetic Predisposition on Long-term Blood Pressure in Chinese Population
Study Start Date : July 2016
Estimated Primary Completion Date : December 2017
Estimated Study Completion Date : December 2018

Resource links provided by the National Library of Medicine


Groups and Cohorts
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Group/Cohort Intervention/treatment
Hanzhong cohort
A total of 4623 adolescents aged 6-15 years old in Hanzhong rural areas were recruited in 1987.During the follow-up period, the information about the incidence and risk factors of hypertension will be collected.
 Other: Incidence and risk factors of hypertension
During the follow-up period,General information(age, sex, BMI, blood pressure, the history of drink and smoke, medical history, etc).Blood biochemistry parameters（Lipid, hsCRP levels, etc）and other laboratory examination parameters(arterial stiffness,IMT, FMD) will be collected.
Mei county cohort
A total of 675 individuals from 126 families were recruited in this family-based dietary intervention study. A community-based BP screening was conducted among adults aged 18-60 years in the study villages. The probands who had a mean systolic BP (SBP) between 130-160 mmHg and/or a diastolic BP (DBP) between 85-100 mmHg and no use of antihypertensive medications and their parents, siblings, spouses, and offspring were recruited in this study. During the follow-up period, the information about the incidence and risk factors of hypertension will be collected.
 Other: Incidence and risk factors of hypertension
During the follow-up period,General information(age, sex, BMI, blood pressure, the history of drink and smoke, medical history, etc).Blood biochemistry parameters（Lipid, hsCRP levels, etc）and other laboratory examination parameters(arterial stiffness,IMT, FMD) will be collected.


Outcome Measures
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Primary Outcome Measures :
  1. blood pressure value(mmHg) [ Time Frame: First day of the three-day follow-up period ]
    The follow-up study of these two cohorts will last approximately 18 months (Jul 2016 to Dec 2017). During this period, each subject will receive a three-day follow-up examination. Three BP(mmHg) measurements will be obtained using a mercury sphygmomanometer on the first day of the three-day follow-up period.


Secondary Outcome Measures :
  1. Left ventricular hypertrophy（g/m^2） [ Time Frame: During the three-day follow-up period ]
    The follow-up study of these two cohorts will last approximately 18 months (Jul 2016 to Dec 2017). During this period, each subject will receive a three-day follow-up examination. Left ventricular mass index (LVMI,g/m^2）will be measured using echocardiography during the three-day follow-up period.

  2. Increased arterial stiffness（mm/s） [ Time Frame: During the three-day follow-up period ]
    The follow-up study of these two cohorts will last approximately 18 months (Jul 2016 to Dec 2017).During this period, each subject will receive a three-day follow-up examination. Brachial-ankle pulse wave velocity（baPWV,mm/s）will be measured with Noninvasive automatic waveform analyzer during the three-day follow-up period.

  3. Carotid artery wall thickening（mm） [ Time Frame: During the three-day follow-up period ]
    The follow-up study of these two cohorts will last approximately 18 months (Jul 2016 to Dec 2017).During this period, each subject will receive a three-day follow-up examination. Carotid Intima media thickness (IMT,mm）will be measured using Color Doppler Ultrasound Diagnostic System during the three-day follow-up period.

  4. Microalbuminuria（mg/24h） [ Time Frame: Second day of the three-day follow-up period ]
    The follow-up study of these two cohorts will last approximately 18 months (Jul 2016 to Dec 2017).During this period, each subject will receive a three-day follow-up examination. On the second day,24-hour urinary will be collected and the concentrations of microalbuminuria in the urine sample will be measured with Hitachi biochemical analyzer.The 24-h microalbuminuria（mg/24h）of each subject is calculated as the concentration of microalbuminuria multiplied by the 24-h urine volume of each individual.


Biospecimen Retention:   Samples With DNA
Meixian county adult salt-sensitive hypertension study is a family-based dietary interventional study. Whole blood specimen was collected from each participant who underwent a chronic salt load and potassium supplementation trial.Genomic DNA was extracted from whole blood specimen using the GOLDMAG Whole Blood Genomic DNA Purification Kit.

Eligibility Criteria
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Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.


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Ages Eligible for Study:   6 Years to 60 Years   (Child, Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Probability Sample
Study Population

In March and April, 1987, investigators established the cohort of Hanzhong Adolescent Hypertension Study. A total of 4,623 adolescents aged 6-15 years old in over 20 schools of three towns (Qili, Laojun and Shayan) in Hanzhong, Shaanxi, China were recruited.

In 2003-2004, investigators established the cohort of Mei county adult salt sensitive hypertension Study. This study was a family-based dietary intervention study conducted in a Han Chinese population from rural areas of northern China. A total of 675 subjects from 126 families were recruited in this cohort.

Criteria

Inclusion Criteria:

  1. Hanzhong cohort of Adolescent Hypertension Study:

    • adolescents aged 6-15 years old in over 20 schools of three towns (Qili, Laojun and Shayan) in Hanzhong, Shaanxi, China.

  2. Mei county cohort of adult salt-sensitive hypertension study:

    • Han individuals in rural northern China
    • adults aged 18-60 years
    • individuals who had a mean systolic BP (SBP) between 130-160 mmHg and/or a diastolic BP (DBP) between 85-100 mmHg and no use of antihypertensive medications were identified as the proband
    • the probands'parents,siblings, spouses, and offspring were recruited for the study.

Exclusion Criteria:

During the follow-up period, the exclusion criteria are as follows:

  • Secondary hypertension
  • a history of severe cardiovascular disease
  • chronic kidney disease or liver disease
  • unable to complete the examination
  • unable/refuse to sign the informed consent form
Contacts and Locations
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Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02734472


Contacts
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Contact: Jianjun Mu, doctor 0086-029-85323804 mujjun@163.com
Contact: Chao Chu, master 0086-029-85323800 iaacd@163.com

Locations
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China, Shaanxi
First Affiliated Hospital of Xi'an Jiaotong University Recruiting
Xi'an, Shaanxi, China, 710061
Contact: Jianjun Mu, doctor    0086-029-85323804    mujjun@163.com   
Contact: Chao chu, master    0086-029-85323800    iaacd@163.com   
Sponsors and Collaborators
First Affiliated Hospital Xi'an Jiaotong University
Investigators
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Principal Investigator: Jianjun Mu, doctor First Affiliated Hospital Xi'an Jiaotong University
More Information
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Publications of Results:

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):

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Responsible Party: First Affiliated Hospital Xi'an Jiaotong University
ClinicalTrials.gov Identifier: NCT02734472    
Other Study ID Numbers: XJTU1AF-CRF-2015-006
First Posted: April 12, 2016    Key Record Dates
Last Update Posted: October 2, 2017
Last Verified: September 2017
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: Yes
Plan Description: The achievements will be evaluated by papers published in specialized journals with a peer-reviewed system, and the original dates can be disclosed according to requirements.
Keywords provided by First Affiliated Hospital Xi'an Jiaotong University:
blood pressure
Hypertrophy, Left Ventricular
Vascular Stiffness
Proteinuria
Carotid Artery Diseases
Additional relevant MeSH terms:
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Hypertension
Vascular Diseases
Cardiovascular Diseases