Cardiovascular DiseasesNCT00005367
Epidemiology of Long QTand Asian Sudden Death in Sleep
An observational study of Cardiovascular Diseases and Heart Diseases, run by Utah State University.
Trial summary
To conduct a cross-sectional epidemiologic study of the determinants of prolonged heart rate corrected QT interval (QTc) among 300 men and 300 woman in the population with the highest known risk of SUDS: Southeast Asian refugees in Thailand. . Read more about this study
- Who is it for?
- Ages 0 to 100 years, men only
- Conditions the study is for
- Cardiovascular Diseases, Heart Diseases, Arrhythmia
- How many people
- Not given
- Where
- No sites listed yet
- Study dates
- Feb 1993to Jan 1995
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 0 to 100 years
- Men only
- No healthy volunteers
- Child, Adult, Older adult
No eligibility criteria
About this study
To conduct a cross-sectional epidemiologic study of the determinants of prolonged heart rate corrected QT interval (QTc) among 300 men and 300 woman in the population with the highest known risk of SUDS: Southeast Asian refugees in Thailand. .
Read the detailed description
BACKGROUND:
Sudden and unexplained death in sleep (SUDS) is a leading cause of death of young men in several Asian populations. The immediate cause is ventricular fibrillation in the absence of known disease. A strong environmental component may be inferred from the regional nature of SUDS in groups that are culturally and genetically distinct and the rapid decline in rates of SUDS after migration of Southeast (SE) Asian refugees to the United States. Risk of SUDS rises sharply to a peak among men aged 35 years of age, then declines with increasing age. In a pilot studies of SE Asian refugee men in Thailand with the highest known risk of SUDS, the investigators documented high-prevalences of prolonged heart rate corrected QT interval (QTc), thiamine deficiency, hypokalemia, and a positive association between poor thiamine status, measured by erythrocyte transketolase activity (ETK), and QTc. These limited studies were unable to precisely quantify the relationship between QTc and thiamine status, lacked sufficient power to examine the relationship between QTc and hypokalemia, did not include other electrolytes, and did not address the striking differences in risk of SUDS by sex and age.
DESIGN NARRATIVE:
The study was cross-sectional in design. During a 14-month period, informed consent was obtained from subjects selected in an age-stratified random sample of refugees scheduled for routine medical screening. Blood samples, 12-lead and 24-hour ECGs, and interview data were collected to test the following hypotheses: (1) mean QTc was greater in men than women, (2) mean QTc was greater in men aged 30-39 years than in men younger or older; no similar relationship was expected among women, (3) QTc was positively correlated with poor thiamine status, measured by erythrocyte transketolase activity, (4-6) QTc was negatively correlated with serum levels of potassium, magnesium, and total calcium, and (7) QTc was associated with abnormalities of autonomic control of the heart, as indicated by power spectral analysis of heart rate variability. Secondary aims included studying interactions of thiamine status and electrolytes in the prolongation of QTc, dynamic analysis of QT variation by heart rate level in 24-hr ECGs, and collection of blood specimens for later genetic studies
- Conditions
- Cardiovascular Diseases, Heart Diseases, Arrhythmia, Death, Sudden, Cardiac, Long QT Syndrome
- Medical subject headings
- Cardiovascular Diseases, Heart Diseases, Arrhythmias, Cardiac, Death, Sudden, Cardiac, Long QT Syndrome
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted26 May 2000 (estimated)
- Study startFeb 1993
- Study completionJan 1995
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Cardiovascular DiseasesStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
Sponsor and investigators
- Lead sponsor
- Utah State University
- Sponsor type
- University, hospital or other
- Collaborators
- National Heart, Lung, and Blood Institute (NHLBI)
- Investigators
- Ronald Munger, Utah State University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00005367
- Sponsor's protocol ID
- 4254
- Other IDs
- R01HL049432
- Status last verified
- Mar 2005
- First submitted
- 25 May 2000
- Last updated
- 27 Apr 2021
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Publications
Munger RG, Booton EA. Bangungut in Manila: sudden and unexplained death in sleep of adult Filipinos. Int J Epidemiol. 1998 Aug;27(4):677-84. doi: 10.1093/ije/27.4.677.
PubMed 9758125
Study at a glance
From the registry record, last updated by the sponsor on 27 Apr 2021. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Epidemiology of Long QTand Asian Sudden Death in Sleep
- ClinicalTrials.gov ID
- NCT00005367
- Acronym / sponsor ID
- 4254
- Conditions
- Cardiovascular Diseases, Heart Diseases, Arrhythmia, Death, Sudden, Cardiac, Long QT Syndrome
- Study type
- Observational
- Recruitment status
- Completed
- Lead sponsor
- Utah State UniversityUniversity, hospital or other
- Collaborators
- National Heart, Lung, and Blood Institute (NHLBI)
- Study start
- Feb 1993
- Study completion
- Jan 1995
- First posted
- 26 May 2000 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
To conduct a cross-sectional epidemiologic study of the determinants of prolonged heart rate corrected QT interval (QTc) among 300 men and 300 woman in the population with the highest known risk of SUDS: Southeast Asian refugees in Thailand. .
Detailed description
BACKGROUND:
Sudden and unexplained death in sleep (SUDS) is a leading cause of death of young men in several Asian populations. The immediate cause is ventricular fibrillation in the absence of known disease. A strong environmental component may be inferred from the regional nature of SUDS in groups that are culturally and genetically distinct and the rapid decline in rates of SUDS after migration of Southeast (SE) Asian refugees to the United States. Risk of SUDS rises sharply to a peak among men aged 35 years of age, then declines with increasing age. In a pilot studies of SE Asian refugee men in Thailand with the highest known risk of SUDS, the investigators documented high-prevalences of prolonged heart rate corrected QT interval (QTc), thiamine deficiency, hypokalemia, and a positive association between poor thiamine status, measured by erythrocyte transketolase activity (ETK), and QTc. These limited studies were unable to precisely quantify the relationship between QTc and thiamine status, lacked sufficient power to examine the relationship between QTc and hypokalemia, did not include other electrolytes, and did not address the striking differences in risk of SUDS by sex and age.
DESIGN NARRATIVE:
The study was cross-sectional in design. During a 14-month period, informed consent was obtained from subjects selected in an age-stratified random sample of refugees scheduled for routine medical screening. Blood samples, 12-lead and 24-hour ECGs, and interview data were collected to test the following hypotheses: (1) mean QTc was greater in men than women, (2) mean QTc was greater in men aged 30-39 years than in men younger or older; no similar relationship was expected among women, (3) QTc was positively correlated with poor thiamine status, measured by erythrocyte transketolase activity, (4-6) QTc was negatively correlated with serum levels of potassium, magnesium, and total calcium, and (7) QTc was associated with abnormalities of autonomic control of the heart, as indicated by power spectral analysis of heart rate variability. Secondary aims included studying interactions of thiamine status and electrolytes in the prolongation of QTc, dynamic analysis of QT variation by heart rate level in 24-hr ECGs, and collection of blood specimens for later genetic studies
Study design
Who may qualify
- Ages
- 0 to 100 years
- Sex
- Male only
- Healthy volunteers
- Not accepted
- Age groups
- Child, Adult, Older adult
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Not reported in the source record.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 27 Apr 2021.
- Background: PubMed 9758125Munger RG, Booton EA. Bangungut in Manila: sudden and unexplained death in sleep of adult Filipinos. Int J Epidemiol. 1998 Aug;27(4):677-84. doi: 10.1093/ije/27.4.677.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Ronald Munger
Utah State University
Questions about this trial
What is this clinical trial studying?
An observational study of Cardiovascular Diseases and Heart Diseases, run by Utah State University.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 27 Apr 2021. Status can change between updates, so confirm with the study contact before making plans.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT00005367, which also lists 1 linked publication.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 27 Apr 2021.