Key result
Aortic valve replacement for aortic stenosis was associated with an early increase in IL-18BP followed by a later peak in IL-18.
Why the study?
Does aortic valve replacement alter plasma levels of IL-18 and IL-18BP in patients with aortic stenosis?
Observational (n=22)
Does aortic valve replacement alter plasma levels of IL-18 and IL-18BP in patients with aortic stenosis?
Plasma IL-18 and IL-18BP are differentially regulated after aortic valve replacement, suggesting they may play a role in the reverse myocardial remodeling process.
Answers are grounded in this paper and cite their sources.
May inform reverse remodeling biology post-AVR; hypothesis-generating and should not yet change practice.
OBJECTIVES: Patients with aortic stenosis (AS) develop left ventricular remodeling characterized by changes in extracellular matrix (ECM) and cardiomyocyte-hypertrophy. Aortic valve replacement (AVR) reverses this process (reverse remodeling). We examined plasma levels of interleukin-18 (IL-18) and its binding protein (IL-18BP) before and after AVR for AS since these mediators have been shown experimentally to exert effects on myocardial remodeling. DESIGN: Plasma levels of IL-18 and IL-18BP were analyzed in 22 patients with AS undergoing AVR, preoperatively, two days, six and 12 months postoperatively. Echocardiography and functional testing were performed. RESULTS: IL-18BP was significantly increased by 28% and 15% at two days and six months after AVR, compared to preoperative values. In contrast, IL-18 showed a later peak (increased by 24% at 12 months postoperatively) when IL-18BP was normalized. IL-18 correlated positively with deceleration time (R = 0.44) at this time-point which might indicate an association with diastolic function. CONCLUSIONS: We report for the first time that plasma IL-18 and IL-18BP are differentially regulated after AVR for AS with an early increase in IL-18BP postoperatively followed by a later peak in IL-18 at 12 months. Given the known effects of these mediators on myocardial remodeling and function, they might play a role in the reverse and remodeling process associated with AVR.
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Majak et al. (2009) conducted an observational in Aortic stenosis (n=22). Aortic valve replacement vs. Preoperative baseline was evaluated on Plasma levels of IL-18 and IL-18BP. Aortic valve replacement for aortic stenosis was associated with an early increase in IL-18BP followed by a later peak in IL-18.
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