EOIFP Block Versus OSTAP Block for Upper Abdominal Surgery

Inclusion Criteria: * Written informed consent; * 18-85 years old; * ASA Physical Status 1-3 * Scheduled for elective open upper abdominal surgery with supraumbilical incision (gastrectomy, hepatectomy, pancreatectomy, splenectomy, supraumbilical ventral hernia repair). * Anticipated hospitalization of three nights; * Expected requirement for parenteral opioids for at least 48 hours for postoperative pain Exclusion Criteria: * Hepatic disease, e.g. twice the normal levels of liver enzymes; * Chronic kidney disease according to GFR (may be stage 3 or worse as defined by a GFR \<60 * Allergic reaction to study medications; * Women who are pregnant or breastfeeding; * Nephrectomy or lower abdominal surgeries such as hysterectomy, colorectal surgeries * Patient refusal