西地那非并没有改善HFrEF和PH患者的症状、生活质量或运动能力

2022-05-25 刘少飞 MedSci原创

肺动脉高压(PAH)可能会并发射血分数降低的心力衰竭(HFrEF),并与大量症状负担和不良预后有关。西地那非可能对HFrEF和PHT的肺血流动力学、心功能和运动能力有好处。

肺动脉(PA)压力升高是心力衰竭患者的常见发现,反映了左心房压力增加、肺血管收缩、肺顺应性降低、内皮素水平增加以及肺动脉和肺毛细血管床的结构变化。内皮功能紊乱导致的NO生成障碍可能对肺动脉高压(PH)的发展有重要贡献。抑制磷酸二酯酶-5(PDE-5)酶是HF患者的一种潜在疗法。 PDE-5抑制剂可以防止环磷酸鸟苷(GMP)的降解,从而提高NO的可用性,导致血管扩张,特别是肺循环。西地那非被广泛用于治疗特发性肺动脉高压(IPAH),但对于继发于左心室衰竭的PH患者,尚缺乏有力的获益证据。早期研究表明,西地那非可能对肺部血流动力学产生有利影响,特别是对射血分数降低的心力衰竭(HFrEF)患者。随后,几个小型的单中心试验和一个包括284名患者的荟萃分析表明,西地那非可以改善HFrEF的症状和运动能力。因此,我们进行了一项多中心、安慰剂对照试验,以评估慢性西地那非治疗对HFrEF和超声心动图显示的PH患者的症状和运动能力的影响。

研究目的:

确定西地那非对HFrEF和PH间接证据患者的安全性、耐受性和疗效。

研究方法和结果:

西地那非治疗心力衰竭(SilHF)试验是一项由研究者领导的随机多国试验,HFrEF和超声心动图显示肺动脉收缩压(PASP)≥40mmHg的患者按2:1的比例随机分配接受西地那非(最多40mg,三次/天)或安慰剂。共同主要终点是在24周时,通过视觉模拟量表和6分钟步行测试来改善患者的整体评估。计划的样本量为210人,但由于西地那非/安慰剂的供应和招募问题,只纳入了69名患者(11名女性,中位年龄68(IQR 62, 74)岁,中位左心室射血分数29%(IQR 24, 35),中位PASP 45(IQR 42, 55)mmHg)。与安慰剂相比,西地那非并没有改善症状、生活质量、PASP或步行测试距离。西地那非的耐受性一般较好,但被分配到西地那非的患者发生严重不良事件的比例较高(33% vs. 21%)。

研究结论:

与安慰剂相比,西地那非并没有改善HFrEF和PH患者的症状、生活质量或运动能力。

 

参考文献:

Cooper TJ, Cleland JG, Guazzi M, Pellicori P, Ben Gal T, Amir O, Al-Mohammad A, Clark AL, McConnachie A, Steine K, Dickstein K. Effects of sildenafil on symptoms and exercise capacity for heart failure with reduced ejection fraction and pulmonary hypertension (The SilHF study): A randomised placebo-controlled multicentre trial. Eur J Heart Fail. 2022 May 21. doi: 10.1002/ejhf.2527. Epub ahead of print. PMID: 35596935.

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