Table 2.

Overview of important studies on renal function impairment in chronic thromboembolic pulmonary hypertension (CTEPH).

Study or author’s name	Year	Patient group	Main results
Delcroix et al. (International Prospective Registry) [51]	2016	679 patients with CTEPH	Dialysis-dependent renal — risk factors of death
Darocha et al. [58]	2019	250 BPA in 41 patients	Low rate of CIN (0.8%) Renal function improvement and creatinine reduction after BPA treatment
Kriechbaum et al. [60]	2019	265 BPA in 51 patients	CI-AKI occurred after 6 (2.3%) BPA Patients with CKD — renal function improved after BPA
Kimura et al. [61]	2015	46 patients treated by BPA	Upturn of renal filtration in patients with initially impaired kidney function
Isobe et al. [62]	2019	45 patients	Increased of cardiac index and mixed venous oxygen saturation with a decrease of mPAP and PVR-predictors of renal insufficiency improvement after BPA

BPA — balloon pulmonary angioplasty; CI-AKI — contrast-induced acute kidney injury; CIN — contrast-induced nephropathy; CKD — chronic kidney disease; mPAP — mean pulmonary artery pressure; PVR — pulmonary vascular resistance