Pediatric open heart operations without diagnostic cardiac catheterization Jean-Pierre Pfammatter, MD, Pascal A Berdat, MD, Thierry P Carrel, MD, Franco P Stocker, MD The Annals of Thoracic Surgery Volume 68, Issue 2, Pages 532-536 (August 1999) DOI: 10.1016/S0003-4975(99)00511-1
Fig 1 Evolution of the ratio between diagnostic catheterizations and open heart procedures during the past 18 years at our institution. The Annals of Thoracic Surgery 1999 68, 532-536DOI: (10.1016/S0003-4975(99)00511-1)