Abstract Body (Do not enter title and authors here): Background

Radiation associated heart disease has a wide spectrum of manifestations including pericardial disease, coronary artery disease, and valvular heart disease. Mitral valve regurgitation is the second most common valvular dysfunction in patients with prior mediastinal radiation.

Research Question

What are the outcomes of percutaneous or transcatheter mitral valve replacement/repair (T-MVR) versus surgical mitral valve replacement/repair (S-MVR) in patients with prior mediastinal radiation.

Methods

The National Inpatient Sample (NIS) was analyzed from 2015-2020 to identify patients with mediastinal tumors and prior exposure to radiation therapy undergoing mitral valve repair/replacement. We subclassified the data into hospitalizations for S-MVR and T-MVR. Baseline characteristics were compared between the two groups and multivariate logistic regression was used to analyze hospitalization outcomes.

Results

A total of 1725 patients with prior mediastinal radiation were hospitalized for MVR; 1110 (64.3%) patients underwent S-MVR and 615 (35.6%) patients underwent T-MVR. On a multivariable analysis, the odds of MACCE [aOR: 2.21; 95 % CI: (1.87-4.01); p <0.001)], and in-hospital mortality [aOR: 5.6; 95% CI (2.06-7.35); p=0.008] were higher in patients undergoing S-MVR compared to those undergoing T-MVR. Additionally, patients undergoing S-MVR had higher odds of periprocedural complications including cardiogenic shock [aOR: 7.4; 95% CI: (3.75 -9.20); p <0.001], major bleeding [aOR: 2.9; 95% CI: (1.26-7.09); p=0.01], AKI [aOR: 3.4; 95% CI: (1.33-5.23); p <0.001], stroke [aOR: 5.01; 95% CI: (1.51-6.57); p=0.008], and MCS utilization [aOR: 3.05; 95% CI: (1.31-7.13); p=0.009] compared to the T-MVR cohort.

Conclusion

Compared to T-MVR, S-MVR was associated with higher odds of MACCE, in-hospital mortality and periprocedural complications suggesting that T-MVR might be a safer option for MVR among patients with prior mediastinal radiation.