It was found that the ductus arteriosus is a muscular channel and resembles the muscular artery in structure. The diameter of the ductus is equal throughout its length. At the orifice of the ductus to the aorta the cells of its wall blend with those of the aorta. The primordia of the tunica media of the aorta and the pulmonary trunk consist of regularly arranged, circular layers which are more ...

Heart failure and persistent respiratory insufficiency associated with patent ductus arterioeus occur frequently in lowbirth-weight infants.'-" Surgical ligation of the patent ductus arteriosus (PDA) has been advocated when conservative medical management fails.3 '7 This report describes our experience with 14 patients averaging a weight of less than 1500 grams each who were presented for thora...

The adrenergic innervation of the patent human ductus arteriosus was studied using the Falck-Hillarp fluorescent histochemical method for the localization of monoamines. Few adrenergic terminals were demonstrated in the muscular layers of the patent ductus arteriorms in 14 specimens examined. The innervation to the adventitia was sparse to moderate. The possibility that a developmental abnormal...

BACKGROUND Congenital pulmonary valve stenosis and patent ductus arteriosus are common congenital heart defects in dogs. However, concurrence of atypical pulmonary valve stenosis and patent ductus arteriosus is uncommon. This report describes the anatomic, histopathologic, and echocardiographic features in a dog with concomitant pulmonary valve stenosis and patent ductus arteriosus with atypica...

The clinical and physiological characteristics of the uncomplicated patent ductus arteriosus in the adult have been well-defined and understood for many years. A typical continuous murmur usually develops early in life; the electrocardiogram is usually normal or shows a left axis deviation; and heart fluoroscopy ordinarily shows only mild to moderate left ventricular enlargement, vigorous aorti...

DESCRIPTION A premature newborn weighing 1.9 kg, presenting with cyanosis, feeding and respiratory difficulties was admitted to our centre for further evaluation. An initial echocardiogram suggested a pulmonary atresia with a malalignment infundibular ventricle septum defect with atypical right-sided ductus arteriosus (2.4 mm) arising from the aberrant right subclavian artery (4 mm), which was ...

Normal pulmonary artery pressure and pulmonary hypertension assessment of newborns is rarely reported. The aim of the study is to explore dynamic changes of pulmonary arterial pressure and ductus arteriosus in human newborns from birth to 72 h of age with echocardiography.A total of 76 cases of normal newborns were prospectively detected by echocardiography after birth of 2 h, 6 h, 12 h, 24 h, ...

We reported a 21-year-old patient with strict descending aorta coarctation and small post-ductal patent ductus arteriosus, complicated with abortion and hypertension. The patient was successfully treated by endovascular stent-graft with a single cardiac catheterization. Endovascular stent-graft is an easy, safe, and reliable intervention for the treatment of strict descending aorta coarctation ...

The classic findings of a patent ductus arteriosus in a young individual are familiar to most physicians. However, it has been appreciated that several factors, principally pulmonary hypertension or pulmonary artery dilatation in the absence of appreciable hypertension, may significantly alter the classic image and lead to the erroneous diagnosis of ventricular septal defect. In 10 surgically p...