Abstract
Carbon monoxide poisoning (COP) may lead to ischemic changes in organs, and heart is one of the most susceptible targets to ischemic condition. The objective of this study is to evaluate the risk of myocardial infarction following COP. Using a nationwide database of insurance claims in Taiwan, we conducted a population-based cohort study to identify COP patients diagnosed between 1999 and 2012. At a ratio of 3:1, we identified non-COP patients who were matched by the index date and age and compared the risk of myocardial infarction between the two cohorts by time after the index dates of the COP patients, until 2013. We identified 22,258 COP patients and 66,774 non-COP patients. COP patients had an increased risk of myocardial infarction, with an incidence rate ratio of 1.45 (95% confidence interval 1.06–1.98) in comparison with the non-COP patients after adjusting for other independent predictors, including older age, male sex, and underlying comorbidity of hypertension, diabetes, and renal disease. Stratified analyses showed that the increased risk was more prominent in patients with a young age (< 34 years), female sex, and liver disease, and occurred only in the first month of follow-up. We concluded that COP increased the risk of myocardial infarction, but the increased risk was only observed in the first month after COP, which indicated that the impact of COP on the heart was mainly acute. Patients who were younger than 34 years, female, and with liver diseases were more prone to myocardial infarction after COP.
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Abbreviations
- COP:
-
Carbon monoxide poisoning
- CO:
-
Carbon monoxide
- NPD:
-
Nationwide Poisoning Database
- LHID2000:
-
Longitudinal Health Insurance Database 2000
- CAD:
-
Coronary artery disease
- ICD-9:
-
International Classification of Diseases-9
- HIV:
-
Human immunodeficiency virus
- NTD:
-
New Taiwan Dollars
- IRR:
-
Incidence rate ratios
- CI:
-
Confidence interval
- AHR:
-
Adjusted hazard ratio
- HBOT:
-
Hyperbaric oxygen therapy
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Funding
This study was supported by Grants CMFHR10677 and CMFHR10734 from the Chi-Mei Medical Center.
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C-C Huang and H-RG designed and conceived this study and wrote the manuscript. H-CH and Y-CC performed the statistical analysis and wrote the manuscript. H-JL, C-C Hsu, J-JW, and S-BS provided professional suggestions and wrote the manuscript. All the authors have read and approved the final manuscript.
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The authors declare no potential conflicts of interest.
Ethical Approval
This study involved human data and was conducted in strict accordance with the Declaration of Helsinki. The study protocol was approved by the Institutional Review Board (IRB) at the Chi-Mei Medical Center.
Informed Consent
The two databases consisted of depersonalized information, and so the requirement of informed consent was waived by the IRB as the study did not affect the welfare of the participants.
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Handling Editor: Gen Suzuki.
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Huang, CC., Ho, CH., Chen, YC. et al. Risk of Myocardial Infarction After Carbon Monoxide Poisoning: A Nationwide Population-Based Cohort Study. Cardiovasc Toxicol 19, 147–155 (2019). https://doi.org/10.1007/s12012-018-9484-9
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DOI: https://doi.org/10.1007/s12012-018-9484-9