X线心室造影单平面Simpson方法计算右心室容积的可行性研究

Single plane Simpson′s method for measurement of right ventricular volume by X-ray ventriculography

目的 探讨X线心室造影单平面Simpson法计算右心室容积的可行性,为计算右心室容积、评价右心室功能提供一个实用的临床方法。方法 对 15枚人的右心室铸型逐个进行相当于体内右前斜位 30°的电影摄影,依据右心室形态的半月模型采用单平面Simpson法计算右心室铸型容积。采用阿基米德原理计算右心室铸型的实际容积。结果 右心室铸型的实际容积为 ( 64 23±24 51)ml, X线心室造影单平面Simpson法计算得出的右心室容积为(58 04±24 45)ml。采用本模型计算得出的右心室容积值低估右心室实际容积值为 (6 19±12 38)ml,但二者差异无统计学意义(t=1 936, P=0 073)。直线相关与回归分析表明,X线心室造影单平面Simpson法计算右心室容积与右心室铸型的实际容积呈显著正相关 (r=0 983,P<0 01 )。回归方程为:右心室铸型的实际容积=1 074×(X线心室造影单平面Simpson法右心室容积)。结论 采用单平面Simpson法计算右心室容积有较高准确性,值得临床进一步研究。

Objective To study the validity of single plane Simpson′s method with conventional X ray ventriculography for estimation of right ventricular (RV) volume Methods Fifteen human RV casts were obtained from 15 subjects who died from non cardiac causes within 24 hours after death These casts were photographed respectively and their volumes were calculated by using the single plane Simpson′s method based on a new half circle model The actual RV cast volumes were determined by water displacement method Results The actual RV volume was (64 23±24 51) ml and the calculated volume was (58 04±24 45) ml The calculated RV volume underestimated the actual volume by (6 19±12 38) ml, but there was no significant difference between the actual and the calculated RV volume( P >0 05) There was a significant correlation between the actual cast volume and the calculated volume ( r =0 983, P <0 01) The regression equation was: RV actual volume = 1 074 ×(RV calculated volume). Conclusion RV volume calculated by single plane Simpson′s method with conventional X ray ventriculography is accurate and deserves further study