Clinical Research Directory

Early vs Postponed Parenteral Nutrition After Emergency Abdominal Surgery

The aim of this study is to investigate the effect of early, supplementary parenteral nutrition following emergency laparotomy. Currently, parenteral nutrition is used in postoperative patients if or when oral or enteral nutrition is not feasible. However, little data exists on the optimal timing of parenteral nutrition. Oral and enteral nutrition is encouraged. Participants will randomized on the second postoperative day if their calorie intake (oral + enteral) is below 50% of the calculated requirement. Patients will be randomized to early (postoperative day 2) or postponed (postoperative day 5) start of parenteral nutrition. The combined oral + enteral + parenteral calorie target is 70-80% of the calculated requirement. Participants in the postponed group will be re-assessed on postoperative day 5, and if their calorie intake is less than 50% parenteral nutrition will be administered. The intervention will continue until oral + enteral intake is at least 70% of the calculated requirement or the participant is at his/her habitual intake.

Translesional PRESSURE Measurements to Assess Clinical Relevance of a Mesenteric Artery Stenosis (PRESSURE-study)

Chronic mesenteric ischemia (CMI) is an incapacitating disease with a vast impact on quality of life due to severe abdominal pain after a meal, resulting in fear of eating and subsequent weight loss. CMI is most frequently caused by an atherosclerotic mesenteric artery stenosis, which is a frequent finding in the general population (6-29%). CMI is less prevalent due to an extensive collateral circulation protecting the gut against ischemia. Hence, imaging alone cannot be relied upon, making the diagnosis of CMI challenging. Treatment decisions for atherosclerotic CMI are currently based on history, stenosis severity on imaging, and signs of mesenteric ischemia during a functional test. Yet, sufficiency of the collateral circulation cannot be assessed, resulting in substantial failure to recover from symptoms after stentplacement (27-31% in single vessel disease), unnecessary complications, and avoidable healthcare expenses. A retrospective cohort study by van Dijk et al. reports that intra-arterial pressure measurements could predict clinical success of mesenteric artery revascularization with an 86% sensitivity and 83% specificity, indicating that mesenteric artery pressure measurements could be a highly desired and promising tool for the assessment of hemodynamic and clinical relevance of a mesenteric artery stenosis. Which is sensible, since pressure gradients will only occur when both a severe mesenteric artery stenosis and an insufficient collateral circulation are present. Another advantages of pressure measurements is the ability to simulate the postprandial physiology, using nitroglycerin, enabling measurements when mesenteric blood flow is maximal. Intra-arterial pressure measurements are currently the most promising tool to guide clinical decision making in patients with suspected CMI and could result in major improvements in quality of life by improving clinical success of mesenteric artery revascularization, decreasing complication risks and decreasing healthcare costs by facilitating allocation of health care resources to those patients actually benefitting from treatment.