Cammack P L, Edie R N, Edmunds L H
J Thorac Cardiovasc Surg. 1987 Sep;94(3):399-404.
Between Jan. 1, 1979, and Jan. 1, 1986, 72 septuagenarians had open heart operations for disease of the mitral valve. Thirty-two (44%) had additional operative procedures. Overall seven patients (9.7%) died within 30 days of operation. Eleven patients had bar calcification of the posterior mitral annulus as defined by three criteria and 61 did not. No differences between these two groups were present except for hospital mortality. Three of the 11 patients (27.3%) died at or soon after operation of complications resulting from the calcified annular bar. Only four of 61 patients (6.6%) without bar calcification died early. The difference in early mortality between the two groups is significant (p less than 0.05) and identifies the presence of bar calcification of the posterior mitral annulus as an independent risk factor of mitral valve operations in elderly patients.
在1979年1月1日至1986年1月1日期间，72名老年患者因二尖瓣疾病接受了心脏直视手术。其中32名（44%）还接受了其他手术操作。总体而言，7名患者（9.7%）在术后30天内死亡。根据三项标准定义，11名患者存在二尖瓣后瓣环条带钙化，61名患者没有。除了医院死亡率外，这两组之间没有其他差异。11名患者中有3名（27.3%）在手术时或术后不久因钙化瓣环条带引起的并发症死亡。61名无条带钙化的患者中只有4名（6.6%）早期死亡。两组之间的早期死亡率差异显著（p小于0.05），并确定二尖瓣后瓣环条带钙化是老年患者二尖瓣手术的独立危险因素。
