Rader Florian, Sachdev Esha, Arsanjani Reza, Siegel Robert J
Heart Institute, Cedars-Sinai Medical Center, Los Angeles, Calif.
Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, Calif.
Am J Med. 2015 Apr;128(4):344-52. doi: 10.1016/j.amjmed.2014.10.054. Epub 2014 Nov 25.
Valvular aortic stenosis is the second most prevalent adult valve disease in the United States and causes progressive pressure overload, invariably leading to life-threatening complications. Surgical aortic valve replacement and, more recently, transcatheter aortic valve replacement effectively relieve the hemodynamic burden and improve the symptoms and survival of affected individuals. However, according to current American College of Cardiology/American Heart Association guidelines on the management of valvular heart disease, the indications for aortic valve replacement, including transcatheter aortic valve replacement, are based primarily on the development of clinical symptoms, because their presence indicates a dismal prognosis. Left ventricular hypertrophy develops in a sizeable proportion of patients before the onset of symptoms, and a growing body of literature demonstrates that regression of left ventricular hypertrophy resulting from aortic stenosis is incomplete after aortic valve replacement and associated with adverse early postoperative outcomes and worse long-term outcomes. Thus, reliance on the development of symptoms alone without consideration of structural abnormalities of the myocardium for optimal timing of aortic valve replacement potentially constitutes a missed opportunity to prevent postoperative morbidity and mortality from severe aortic stenosis, especially in the face of the quickly expanding indications of lower-risk transcatheter aortic valve replacement. The purpose of this review is to discuss the mechanisms and clinical implications of left ventricular hypertrophy in severe valvular aortic stenosis, which may eventually move to center stage as an indication for aortic valve replacement in the asymptomatic patient.
在美國,主動脈瓣狹窄是第二常見的成人瓣膜疾病,會引起進行性壓力負荷過重,必然導致危及生命的併發症。外科主動脈瓣置換術,以及最近的經導管主動脈瓣置換術,能有效緩解血流動力學負擔,改善患者的症狀和生存率。然而,根據美國心臟病學會/美國心臟協會目前關於瓣膜性心臟病管理的指南,主動脈瓣置換術(包括經導管主動脈瓣置換術)的指征主要基於臨床症狀的出現,因為症狀的出現表明預後不佳。在症狀出現之前,相當一部分患者會出現左心室肥厚,而且越來越多的文獻表明,主動脈瓣狹窄所致左心室肥厚在主動脈瓣置換術後不會完全消退,並與術後早期不良結果和更差的長期結果相關。因此,僅依靠症狀的出現而不考慮心肌的結構異常來確定主動脈瓣置換術的最佳時機,可能會錯失預防嚴重主動脈瓣狹窄術後發病率和死亡率的機會,尤其是在低危險性經導管主動脈瓣置換術指征迅速增加的情況下。本綜述的目的是討論重度主動脈瓣狹窄時左心室肥厚的機制和臨床意義,左心室肥厚最終可能成為無症狀患者主動脈瓣置換術的指征而受到重視。