<prompt> A 2 month old child, born prematurely is brought with respiratory distress. Cardiac examination revealed increased pulse peessure and a pansystolic murmur best heard in 2nd left intercostal space. The most probable diagnosis would beAtrial septal defectVentricular septal defectPatent ductus aeriosusTetralogy of fallots  <response>: Patent ductus aeriosus PDA is a persistent opening between the two major blood vessels leading from the hea. The opening, called the ductus aeriosus, is a normal pa of a baby;s circulatory system before bih that usually closes sholy after bih. Reference: GHAI Essential pediatrics, 8th edition 