Clinical trial NCT05645926: Association of Obesity and Cardiovascular Outcomes in Myocardial Infarction
Official title: Association of Obesity and Cardiovascular Outcomes in Patients With Myocardial Infarction : a Korean Nationwide Cohort Study
Study type: OBSERVATIONAL
Overall status: ACTIVE_NOT_RECRUITING
Conditions: Obesity Associated Disorder
Myocardial Infarction
Keywords: Obesity paradox
Myocardial infarction
Lead sponsor: Ajou University School of Medicine
Sponsor class: OTHER
First posted: 2022-12-12
Enrollment: 60000
Sex: ALL
Minimum age (years): 20
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: COHORT
Time perspective: OTHER
Sampling method: NON_PROBABILITY_SAMPLE
Study population: We included patients newly diagnosed with MI and underwent revascularization (PCI or CABG) between January 2015 and December 2020. Patients aged \<20 years, those who were already diagnosed with MI before 2015, and those with cancer were excluded from the analysis. The follow-up period was defined as the time from the index date (date of diagnosis) to each outcome event, date of death, or end of the study period (December 31, 2020), whichever came first.

Brief summary: In this study, the investigators evaluated the association between various measures of adiposity \[BMI and waist circumference (WC)\] and clinical outcomes in Asian patients with Myocardial Infarction who underwent percutaneous coronary intervention or bypass surgery, using a nationwide population based cohort.

Detailed description: This retrospective nationwide cohort study used administrative claims data from the Korean National Health Insurance Service (NHIS) and the combined health check-up database of the National Health Insurance Corporation between 2013 and 2020.

The investigators included patients newly diagnosed with MI and underwent revascularization (PCI or CABG) between January 2015 and December 2020. Patients aged \<20 years, those who were already diagnosed with MI before 2015, and those with cancer were excluded from the analysis. The follow-up period was defined as the time from the index date (date of diagnosis) to each outcome event, date of death, or end of the study period (December 31, 2020), whichever came first.

Patients' demographic data, comorbidities, concomitant medications, and income level were collected from the Korean NHIS database. The recent health check-up data from the index date was also ascertained, including height, weight, waist circumference, blood pressure, health surveys, and laboratory exam. Health survey included family history, smoking history, alcohol history, and the level of individual physical activity.

According to BMI following the World Health Organization recommendation for Asian population, study patients were categorized into 5 groups: underweight, \<18.5 kg/m2; normal range, 18.5 to \<23 kg/m2; overweight, 23 to \<25 kg/m2; obese I, 25 to \<30 kg/m2; and obese II, ≥30 kg/m2\[4\]. The investigators defined the proportion of medical use by calculating formula with the recuperation cost and the number of the visit to hospitals.

During the follow-up period, The investigators assessed 3 clinical outcomes, including all-cause death, cardiovascular hospitalization and the recurrence rate. Clinical outcomes were mainly defined by the the International Classification of Diseases, 10th revision (ICD-10). Patients were censored at the clinical outcomes or the end of the study period (December 31, 2020), whichever came first.

All categorical variables are presented as frequencies and percentages. Normally distributed data were presented as mean ± standard deviation, whereas nonparametric data are presented as median and interquartile range by BMI.

Cox proportional hazard regression analyses were performed to identify the association of BMI with the primary and secondary outcomes, calculating hazard ratio (HR) and 95% confidence interval (CI) and adjusting for the following potential confounders: sex, age, systolic blood pressure, fasting glucose level, total cholesterol level, alcohol consumption, smoking status, physical activity, household income, use of antihypertensive agents, use of statins, use of antiplatelet agents, previous history of MI, previous history of stroke, and index year. All analyses were conducted using R-statistics.

Eligibility criteria: Inclusion Criteria:

* Patients newly diagnosed with MI and underwent revascularization (PCI or CABG) between January 2015 and December 2020.

Exclusion Criteria:

* Patients aged \<20 years
* Patients diagnosed with MI before 2015
* Patients with cancer

Primary outcomes:
measure: MACE
timeFrame: 5 years
Secondary outcomes:
measure: Thromboembolism
timeFrame: 5 years
measure: Death
timeFrame: 5 years
measure: CV hospitalization
timeFrame: 5 years
Other outcomes:
Locations:
city: Suwon
country: Korea, Republic of
facility: Ajou University School of Medicine
state: Gyeong-gido
Study officials:
affiliation: Ajou University School of Medicine
name: Kwang-No LEE
role: STUDY_CHAIR
References:
citation: Park SJ, Ha KH, Kim DJ. Body mass index and cardiovascular outcomes in patients with acute coronary syndrome by diabetes status: the obesity paradox in a Korean national cohort study. Cardiovasc Diabetol. 2020 Nov 10;19(1):191. doi: 10.1186/s12933-020-01170-w.
citation: Kim MS, Kim WJ, Khera AV, Kim JY, Yon DK, Lee SW, Shin JI, Won HH. Association between adiposity and cardiovascular outcomes: an umbrella review and meta-analysis of observational and Mendelian randomization studies. Eur Heart J. 2021 Sep 7;42(34):3388-3403. doi: 10.1093/eurheartj/ehab454.
citation: Biswas S, Andrianopoulos N, Dinh D, Duffy SJ, Lefkovits J, Brennan A, Noaman S, Ajani A, Clark DJ, Freeman M, Oqueli E, Hiew C, Reid CM, Stub D, Chan W. Association of Body Mass Index and Extreme Obesity With Long-Term Outcomes Following Percutaneous Coronary Intervention. J Am Heart Assoc. 2019 Nov 5;8(21):e012860. doi: 10.1161/JAHA.119.012860. Epub 2019 Oct 25.