Paediatrics: Patent Ductus Arteriosus: Free MSRA Podcast

🩺 FREE MSRA PODCAST – Patent Ductus Arteriosus (PDA)Your essential audio guide to understanding, remembering, and applying the key facts about PDA for the MSRA and clinical practice.🧠 Key Learning Points📌 Definition• Patent ductus arteriosus (PDA) is a congenital heart defect where the ductus arteriosus—a fetal blood vessel connecting the aorta and pulmonary artery—remains open after birth, leading to abnormal blood flow.📌 Causes & Risk Factors• Multifactorial: prematurity (especially <28 weeks), maternal rubella in 1st trimester, genetic syndromes (Down, Holt-Oram), birth asphyxia, high altitude birth, valproic acid/indomethacin exposure• Mnemonic: “Prima Rubella Gets Down With High Value Indeed” (Prematurity, Rubella, Genetics, Down syndrome, High altitude, Valproic acid, Indomethacin, Environmental)📌 Pathophysiology• After birth, the ductus is supposed to close as oxygen rises and prostaglandins fall.• Failure to close causes a left-to-right shunt: blood flows from aorta → pulmonary artery → increased pulmonary blood flow and volume overload of the left heart.• If untreated, pulmonary hypertension can develop and the shunt can reverse (Eisenmenger’s), causing cyanosis.📌 Clinical Presentation• Many are asymptomatic if PDA is small.• Classic signs (especially in large PDAs):– Continuous “machinery” murmur (best at left infraclavicular area)– Bounding pulses, wide pulse pressure– Tachypnoea, recurrent chest infections, failure to thrive, poor feeding, signs of heart failure– Differential cyanosis (pink arms, blue legs/toes) in severe/late cases📌 Differential Diagnosis• Other congenital heart defects with left-to-right shunt (ASD, VSD), valve lesions, aortopulmonary window, venous hum, coronary AV fistula, etc.📌 Diagnosis• Echocardiogram: gold standard—shows open duct, shunt direction, chamber sizes• CXR: cardiomegaly, increased pulmonary markings in significant PDA• ECG: may show LVH, BVH or RVH if severe📌 Management• Observation: many close spontaneously (esp. in term/near-term babies)• Medical closure: Indomethacin or ibuprofen (most effective in preterm infants)• Device closure (percutaneous): mainstay for symptomatic PDAs in infants, children, adults• Surgical ligation: for unsuitable/large PDAs or device failure• Prostaglandin E1: used to keep duct open in other congenital defects—not for PDA closure📌 Complications• Pulmonary hypertension• Congestive heart failure• Infective endocarditis• Pulmonary oedema• Growth/feeding issues in infants📌 Prognosis• Excellent if detected and treated early. Most children live normal lives after closure.📎 MSRA Revision Resources for Patent Ductus Arteriosus (PDA):📝 Revision Notes: https://www.passthemsra.com/topic/patent-ductus-arteriosus-pda-revision-notes/🧠 Flashcards: https://www.passthemsra.com/topic/patent-ductus-arteriosus-pda-flashcards/💬 Accordion Q&A Notes: https://www.passthemsra.com/topic/patent-ductus-arteriosus-pda-accordion-qa-notes/🚀 Rapid Quiz: https://www.passthemsra.com/topic/patent-ductus-arteriosus-pda-rapid-quiz/🎓 Full Paediatrics Course: https://www.passthemsra.com/courses/paediatrics-for-the-msra/#MSRA #MSRARevision #Paediatrics #PDA #PatentDuctusArteriosus #CongenitalHeart #MSRAFlashcards #MSRAQuiz #PassTheMSRA