(2-B) 87. Closure of a congenital portosystemic shunt should be considered as an alternative to LT. (2-B) 88. Transplantation is indicated in children with HPS and portosystemic shunting resulting from either a congenital or acquired vascular anomaly or liver disease (cirrhotic or noncirrhotic) and portal hypertension who are not candidates for closure of the shunt. (2-B) Portopulmonary hypertension (PPH) is a rare, insidious, and devastating complication of

portosystemic shunting Barasertib nmr of any cause.[46] Presenting symptoms include dyspnea, cough, or syncope, ut these cardiopulmonary symptoms may be absent. Cardiomegaly may or may not be present on chest x-ray and an electrocardiogram (EKG) may reveal right ventricular hypertrophy, but is most often normal.[46, 397] A transthoracic echocardiogram (ECHO) with evidence of right ventricular wall thickening, tricuspid valve regurgitation, and a calculated pulmonary artery systolic

pressure ≥40 mmHg is the best noninvasive screening tool.[398] Flattening of the inter-ventricular septum, if present on ECHO, may suggest pulmonary artery pressures are near systemic pressure. Cardiac catheterization to exclude other causes of pulmonary hypertension and measure the mean pulmonary artery pressure click here (MPAP) is required to establish the diagnosis of PPH. A PPH severity scale is not established for children, but in adults PPH is considered mild, moderate, or severe if the MPAP is >25 to ≤35, >35 to ≤45, and >45 mmHg, respectively.[399] The presence of severe PPH with MPAR of >50 mmHg has a high risk of mortality, but long-term survival has been reported in a few patients.[399] Experience with PPH in children is limited to case reports and single-site experiences.[46] Medical therapy can stabilize and improve PPH in children and lead to successful LT and subsequent resolution of PPH.[397, 400] Case reports suggest that treatment with endothelin receptor antagonists, prostanoids, and sildenafil can lower the pulmonary pressure

and enable liver transplantation. Severe, uncorrected PPH with MPAP >45 mmHg remains a contraindication for LTx in adults. However, a child with PPH responsive to aggressive medical management but not achieving a MPAP of <45 mmHg did undergo a successful LT.[397] This raises the possibility 上海皓元 that MPAP setpoints for adults may not apply to children. Listed patients with severe PPH who are responsive to medical therapy indicated by a reduction of the MPAP to < 35mmHg now qualify for a model for endstage liver disease (MELD) score exception to receive a liver transplant. However, a similar algorithm has not been developed for children less than 12 years of age. Pulmonary hypertension not responsive to medical therapy is probably a contraindication for transplantation.[401] 89. Children with evidence of PPH should be promptly referred for LT evaluation.