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Background To explore the interventional experience and safety, efficiency of transcatheter closure of patent ductus arteriosus (PDA) in children with body weight ≤8 kg. Methods From May 2001 to August 2013,102 children with body weight ≤8 kg were diagnosed PDA. All patients were underwent transcatheter closure and aorta descendens angiography 6 min after the closure. To observe the therapeutic efficacy, we examed X-ray, ECG and echocardiography 24 h, 1 month, 3 month and 6 month after operation. Results In 102 patients, male 27, female 75, aged from 3 months to 2 years(0.9 ± 0.5 years), body weight from 5 to 8 kg (7.2 ± 0.9) kg.In 102 patients, there were funnel PDA 58, tubular PDA 39, window PDA 1 and irregular PDA 4. The narrowest PDA diameter of pulmonary artery side was 2∼10 (4.8 ± 1.6) mm by aortography. 25 patients used Amplatzer company PDA mushroom occluders, 5 patients used new type Amplatzer ADO-II occluders and 1 patient used Amplatzer Plug. 69 patients used domestic-made PDA mushroom occluders, 2 patients used domestic-made VSD occluders. The mushroom occluders waist diameter was from 6 to 16 mm. 87 patients mean pulmonary pressure were ≥25 mmHg and 43 patients mean pulmonary pressure were ≥50 mmHg before occlusion. The mean pulmonary pressure decreased with different extent after occlusion, which were consistent with dynamic pulmonary artery hypertention. 102 patients were all cured successfully and the closure achievement ratio was 100%. Conclusions PDA patients with low body weight had their own specificness. Interventional therapy has its risk. However, it is still a safe methods to treat PDA if we performed the procedure with cautiousness, selected occluder appropriately and prevent the complication.

Objective To summarise the data of clinical feature, accompanied abnormities and imaging diagnosis of cor triatriatum in 23 cases enlisted in the study. Methods From January 1993 to June 2005, twenty-three patients, 13 males and 10 females with a mean age of (9.6 ± 10.0) years (range 0.3 from 38 years) were studied. All cases were cor triatriatum laevus. Twenty-one of 23 patients were identified in surgery. Complete cor triatriatum in 15 case and incomplete cor triatriatum in 6. Electrocardiogram show that right unsymmetrical cardial axle was in 18 patients and nomal cardial axle in 4. Eight cases had lung congestion in x-ray. Results Echocardiogram diagnosed 12 in 23 cases before surgery. Heart catheter exam diagnosed 4 in 10 cases. sixteen of 21 cases accompanied other abnormities. Main malformations included atrial septal defeat (n = 14), partial anomalous pulmonary venous drainage (n = 6), pulmonary stenosis (n = 3), persistent left superior vena cava (n = 3). Seven of 21 patients had no atrial septal defeat. Conclusions cor triatriatum had great variation in clinical feature and complicated other malformations in high ratio. Color doppler imaging has high worthiness of diagnosis of cor triatriatum, but misdiagnosis and missed diagnosis rate is high in cor triatriatum accompanied other malformations. Heart catheter exam have missed diagnosis to cor triatriatum, but have higher diagnosis rate to accompanied abnormities. Surgical exploration is very important in cor triatriatum accompanied other malformations.