[Clinical analysis of scimitar syndrome in 6 pediatric patients]

Objective: To characterize the clinical features and outcomes of scimitar syndrome (SS) to aid the understanding of this syndrome. Methods: This retrospective study included 6 children who were diagnosed with SS at the pediatric cardiovascular center of Beijing Anzhen Hospital from January 2012 to September 2018. SS was diagnosed by echocardiography and confirmed by cardiac computed tomography angiography(CTA) or surgery. All data were collected to analyze the clinical and imaging characteristics and prognosis. Results: Among the 6 SS children (aged 2 months to 15 years; 5 males) weighed 5.6-17.1 kg. Three cases were infant type, the clinical manifestations were recurrent respiratory tract infection with growth retardation, including 2 cases with severe pulmonary hypertension, while 3 cases with adult type, were asymptomatic. Cardiac CTA imaging showed that the right single or all pulmonary veins descended through the diaphragm and converged into the inferior vena cava. One case was isolated infracardiac partial anomalous pulmonary venous connection (PAPVC) without other malformations. The remaining 5 cases complicated with atrial septal defect, different vascular and trachea malformations as well as spinal malformations. Vascular malformations included pulmonary veins stenosis, abnormal origin of pulmonary artery branches, collateral branches of systemic artery supplying local lung tissue, and persistent left superior vena cava. The treatment varied according to the specific location of anomalous pulmonary venous connection, the degree of pulmonary hypertension and the severity of clinical symptoms. Four cases underwent one-stage radical surgery, one case accepted intervention to occlude the collateral artery which was supplying the right lower lung and received stage Ⅱ radical surgery half a year later, and the remaining one case died from pulmonary hypertension crisis preoperation. Conclusions: Isolated SS can easily miss diagnosis due to mild clinical symptoms. Patients with complicated malformations can benefit from combination therapy. SS associated with severe pulmonary hypertension can lead to early death. Therefore, early diagnosis and appropriate treatment can improve the prognosis of patients.