Objective: To explore the application value of cardiac magnetic resonance (CMR) native T1 mapping for risk stratification in patients with pulmonary arterial hypertension (PAH). Methods: A total of 59 patients with diagnosed PAH and clear-documented risk status in Peking Union Medical College Hospital and underwent CMR examination between January 2019 and December 2021 were retrospectively included, which including 12 males and 47 females, aged from 4 to 77 (31±13) years. Those patients were subdivided into two groups based on the clinically-assessed risk status: low-risk group (n=30) and intermediate-/high-risk group (n=29). Twenty-five healthy individuals were included as controls. Base, midventricular, and apical inferior right ventricular insertion point (IRVIP) native T1 values on short axis images were measured. Native T1 values in PAH patients and control group, in low-risk group and intermediate-/high-risk group were compared, respectively, and receiver operating characteristics (ROC) curves with area under the curves (AUC) were calculated to evaluate the application value of native T1 values for risk stratification in PAH patients. Results: Base, midventricular and apical IRVIP native T1 of PAH patients were all significantly increased as compared to controls [Base:(1 439.31±129.96) vs (1 282.36±37.18) ms;midventricular:(1 450.32±111.55) vs (1 287.56±53.16) ms;apical:(1 444.12±109.15) vs (1 266.36±75.31) ms](all P<0.001). The midventricular IRVIP native T1 values were significantly higher in patients in intermediate-/high-risk status as compared to those in low-risk status [ (1 493.24±126.32) vs (1 428.50±85.73) ms,P=0.026]. The AUC of mid ventricle IRVIP native T1 for distinguishing patients in intermediate-/high-risk status was 0.741. The base [(1 458.21±134.96) vs (1 421.03±104.75) ms, P=0.241] and apical [(1 465.90±125.36) vs (1 423.07±87.87) ms,P=0.136] IRVIP native T1 values in patients in intermediate-/high-risk group were also numerically higher as compared with patients in low-risk status, however, without statistical significant (both P>0.05). Conclusion: Midventricular IRVIP native T1 value might have a role for assisting in risk stratification in PAH patients, which was clinically significant for facilitating the work-up and prognosis improvement of PAH patients.
目的： 探索心脏磁共振（CMR）定量T1 mapping成像用于动脉性肺动脉高压（PAH）危险分层的应用价值。 方法： 回顾性收集2019年1月至2021年12月就诊于北京协和医院确诊PAH、明确危险分层并接受CMR检查的59例患者，男12例，女47例，年龄4~77（31±13）岁。根据危险分层情况将患者分为低危组（30例）和中高危组（29例）。纳入25名健康人作为对照组，男6名，女19名，年龄20~56（35±8）岁。测量所有患者及对照组CMR短轴位心肌基底段、中间段及心尖段的下室间隔右心室插入部（IRVIP）平扫T1 值。分别对PAH患者与对照组、低危组与中高危组PAH患者间各项平扫T1 值进行比较，并采用受试者工作特征（ROC）曲线和曲线下面积（AUC）评估其在PAH患者危险分层中的应用价值。 结果： PAH患者CMR基底段、中间段、心尖段的IRVIP平扫T1值均较对照组增高［基底段：（1 439.31±129.96）比（1 282.36±37.18）ms；中间段：（1 450.32±111.55）比（1 287.56±53.16）ms；心尖段：（1 444.12±109.15）比（1 266.36±75.31）ms］（均P<0.001）。中高危组PAH患者CMR中间段IRVIP的平扫T1值较低危组增高［（1 493.24±126.32）比（1 428.50±85.73）ms，P=0.026］。CMR中间段IRVIP的平扫T1值用于鉴别中高危和低危组患者的AUC为0.741。中高危组PAH患者CMR基底段和心尖段IRVIP的T1值也较低危组增高［分别为（1 458.21±134.96）比（1 421.03±104.75）ms、（1 465.90±125.36）比（1 423.07±87.87）ms］，但差异无统计学意义（均P>0.05）。 结论： 中间段IRVIP的CMR平扫T1 mapping成像用于辅助评估PAH 患者的危险分层有一定价值。.