Is Short-term and Long-term Exposure to Black Carbon Associated with Cardiovascular and Respiratory Diseases? A Systematic Review and Meta-analysis Based on Evidence Reliability

Overview

Journal BMJ Open

Specialty General Medicine

Date 2022 May 3

PMID 35504636

Authors

Xuping Song

Yue Hu

Yan Ma

Liangzhen Jiang

Xinyi Wang

Anchen Shi

Junxian Zhao

Yunxu Liu

Yafei Liu

Jing Tang

Xiayang Li

Xiaoling Zhang

Yong Guo

Shigong Wang

Affiliations

Soon will be listed here.

Abstract

Objective: Adverse health effects of fine particles (particulate matter) have been well documented by a series of studies. However, evidences on the impacts of black carbon (BC) or elemental carbon (EC) on health are limited. The objectives were (1) to explored the effects of BC and EC on cardiovascular and respiratory morbidity and mortality, and (2) to verified the reliability of the meta-analysis by drawing p value plots.

Design: The systematic review and meta-analysis using adapted Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach and p value plots approach.

Data Sources: PubMed, Embase and Web of Science were searched from inception to 19 July 2021.

Eligibility Criteria For Selecting Studies: Time series, case cross-over and cohort studies that evaluated the associations between BC/EC on cardiovascular or respiratory morbidity or mortality were included.

Data Extraction And Synthesis: Two reviewers independently selected studies, extracted data and assessed risk of bias. Outcomes were analysed via a random effects model and reported as relative risk (RR) with 95% CI. The certainty of evidences was assessed by adapted GRADE. The reliabilities of meta-analyses were analysed by p value plots.

Results: Seventy studies met our inclusion criteria. (1) Short-term exposure to BC/EC was associated with 1.6% (95% CI 0.4% to 2.8%) increase in cardiovascular diseases per 1 µg/m in the elderly; (2) Long-term exposure to BC/EC was associated with 6.8% (95% CI 0.4% to 13.5%) increase in cardiovascular diseases and (3) The p value plot indicated that the association between BC/EC and respiratory diseases was consistent with randomness.

Conclusions: Both short-term and long-term exposures to BC/EC were related with cardiovascular diseases. However, the impact of BC/EC on respiratory diseases did not present consistent evidence and further investigations are required.

Prospero Registration Number: CRD42020186244.

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