Backgroud
Although both the atherogenic index of plasma (AIP) and high-sensitivity C-reactive protein (hs-CRP) are recognized as risk markers for stroke, their combined effect has yet to be fully understood. To address this gap, we introduced the inflammatory atherogenic index (IAI), a composite measure incorporating AIP and hs-CRP, and investigated its potential in predicting stroke ris
Methods
We analyzed data from the China Health and Retirement Longitudinal Study (CHARLS). IAI was calculated using the formula: IAI = AIP × hs-CRP / 10. Cox proportional hazard models were used to estimate stroke risk associated with IAI. Mediation analysis using VanderWeele’s method evaluated the mediating role of systolic and diastolic blood pressures.
Results
The study included 9,687 participants with a mean baseline age of 58.66 years (SD = 9.23), of whom 4,542 (46.9%) were male. Over the 7-year follow-up period, 662 incident stroke cases (6.8%) were recorded. After adjusting for all covariates, each standard deviation (SD) increase in the inflammatory atherogenic index (IAI) was linked to an 11.0% higher stroke risk (HR = 1.11, 95% CI: 1.03–1.19). A nonlinear, inverted U-shaped relationship between IAI and stroke risk was observed (P = 0.015). Mediation analysis showed that systolic and diastolic blood pressures mediated 19.64% and 25.79% of the IAI-stroke association. Hs-CRP and AIP also interacted synergistically to increase stroke risk (synergy index = 1.35, 95% CI: 1.03–1.76).
Conclusions
IAI is associated with increased stroke risk, with mediation by blood pressure. This highlights the potential of IAI as a biomarker for stroke risk, with early intervention in patients with high IAI potentially reducing stroke risk.
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