<prompt> Which vessel is most likely to get affected in ulcer perforation involving 1st pa of duodenum?IVCGastroduodenal aerySuperior mesenteric aeryInferior pancreaticoduodenal aery  <response>: Gastroduodenal aery is most likely to get affected in ulcer perforation of first pa of duodenum as it is closely associated with the posterior wall of the duodenum. Ref: Clinical Anatomy by Regions edited by Richard S. Snell - 2007, Page 298 