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| ductus arteriosus | |
|---|---|
| Name | Ductus arteriosus |
| Latin | Ductus arteriosus |
| System | Circulatory system |
| Precursor | Sixth aortic arch |
| Precursor2 | Cardiac outflow tract |
| Blood supply | Left pulmonary artery, Descending aorta |
ductus arteriosus
The ductus arteriosus is a fetal vascular shunt connecting the pulmonary arterial system to the systemic arterial system, essential for prenatal circulation. It forms from the sixth aortic arch during embryonic development and undergoes tightly regulated functional and anatomical closure after birth, with failure to close leading to patent ductus arteriosus and related morbidities.
The ductus arteriosus arises from the distal portion of the sixth pair of aortic arches during the Carnegie stages of Human embryogenesis and courses between the left pulmonary artery and the proximal descending aorta. Embryologists such as Wilhelm His Sr. and anatomists associated with the Carnegie Institution characterized its origin in relation to the truncus arteriosus and bulbus cordis. Its wall contains smooth muscle derived from neural crest cell populations studied in classic experiments involving researchers at institutions like Johns Hopkins University and Harvard Medical School; genetic pathways involving transcription factors discovered at laboratories such as Max Planck Institute and Salk Institute influence its morphogenesis. The ductus’s intimal cushions and vasa vasorum relationships parallel findings in studies by researchers at Mayo Clinic and Cleveland Clinic examining congenital extracardiac structures.
In fetal circulation described by investigators from Guy's Hospital and Great Ormond Street Hospital, the ductus arteriosus diverts most right ventricular output away from the developing lungs to the placenta, interacting with shunts like the foramen ovale and the umbilical vein. Physiological mediators such as prostaglandin E2, nitric oxide signaling elucidated in work at Karolinska Institute, and oxygen tension studied by teams at University of Oxford maintain patency; comparative physiology insights from researchers at Smithsonian Institution and University of Cambridge illuminate species differences. Hemodynamic contributions described in landmark studies at Massachusetts General Hospital and St Thomas' Hospital show how pulsatile flow and pressure gradients between the pulmonary artery and aorta optimize fetal oxygen delivery as modeled by computational groups at MIT.
Postnatal anatomical transformation of the ductus arteriosus involves a rapid functional constriction mediated by increased oxygen tension and decreased prostaglandin E2, mechanisms explored at University College London and Yale School of Medicine. Cellular pathways involving endothelin, ion channels, and smooth muscle remodeling were characterized in laboratory programs at University of Pennsylvania and the National Institutes of Health. Remodeling culminates in intimal proliferation and fibrosis producing the ligamentum arteriosum, a structure referenced in surgical atlases from Cleveland Clinic and Stanford University School of Medicine. Historical surgeons such as Theodore T. Billroth and institutions like Great Ormond Street Hospital contributed to understanding implications of incomplete closure for later procedures including thoracic approaches cataloged in texts from Royal College of Surgeons.
Patent ductus arteriosus (PDA) incidence varies with prematurity and altitude, patterns documented by epidemiologists at World Health Organization, Centers for Disease Control and Prevention, and UNICEF. Neonatology cohorts from Vanderbilt University Medical Center and Karolinska University Hospital report higher PDA frequency in very low birthweight infants and with maternal factors studied at Johns Hopkins Bloomberg School of Public Health and Imperial College London. Genetic associations identified in consortia including researchers from Broad Institute and Wellcome Trust Sanger Institute implicate loci characterized through genome-wide association studies coordinated with European Molecular Biology Laboratory. Risk is modulated by infections noted in studies at CDC and exposure to medications reviewed by teams at FDA.
Clinically, PDA can present with a characteristic continuous "machinery" murmur noted in classic cardiology texts used at Mount Sinai Health System and UCSF Medical Center, or with signs of heart failure, failure to thrive, and respiratory distress described in neonatal protocols from Royal Brompton Hospital and Texas Children's Hospital. Complications include pulmonary overcirculation, pulmonary vascular disease documented in registries such as those maintained by European Society of Cardiology, and infective endarteritis reported in case series from Mayo Clinic and Johns Hopkins Hospital. Long-term sequelae referenced in longitudinal studies from Framingham Heart Study collaborators include ventricular volume overload and exercise intolerance tracked by research groups at University of California, San Diego.
Diagnosis relies on auscultation and multimodal imaging practiced at centers like Massachusetts General Hospital and Sheffield Children's Hospital. Echocardiography with Doppler flow remains the cornerstone as standardized in guidelines from American Heart Association and American Academy of Pediatrics, complemented by chest radiography and electrocardiography techniques taught at Royal College of Physicians. Advanced imaging with cardiac catheterization and angiography performed in interventional suites at Mayo Clinic or cross-sectional imaging with CT and MRI protocols developed at Karolinska Institute aid in anatomical delineation, while pulse oximetry screening programs advocated by WHO assist early detection.
Management strategies range from pharmacologic closure using cyclooxygenase inhibitors like indomethacin and ibuprofen, protocols refined at University of Iowa and Children's Hospital of Philadelphia, to catheter-based device occlusion pioneered by teams at Cleveland Clinic and Great Ormond Street Hospital. Surgical ligation and division remain options in select cases described in surgical series from Johns Hopkins Hospital and Mayo Clinic. Management algorithms from European Society for Paediatric and Neonatal Intensive Care and American College of Cardiology integrate considerations of gestational age, comorbidities, and center-specific expertise, with post-procedural follow-up frameworks used at Stanford Children’s Health.
Prognosis varies with timing of intervention and associated anomalies as reported in outcomes research from National Institutes of Health and long-term follow-up studies at University of Michigan. Preventive strategies include antenatal care programs promoted by UNICEF and World Health Organization and perinatal risk reduction protocols developed at Johns Hopkins Bloomberg School of Public Health and Imperial College London. Population health initiatives tracked by Centers for Disease Control and Prevention and research into molecular therapeutics at Broad Institute aim to reduce PDA-related morbidity and improve neonatal survival.
Category:Circulatory system