Acute Abdominal Pain: Evaluation of Lactate Value as Predictive Factor of Surgical Issue

Abdominal pain is one of the most common reasons for consultation worldwide in Emergency Departments (ED). The challenge for physicians is to not misdiagnose a surgical emergency. The actual gold standard for diagnosis is computed tomography (CT). However with this procedure there is high radiation exposure and a risk factor of radiation-induced cancers, therefore alternative diagnostic techniques should be considered. The aim of this study is to evaluate the diagnostic performance of measuring venous lactate in patients with acute abdominal pain in ED. A single-center, prospective, non-interventional study, will be conducted between June 2016 and January 2017 in the university emergency department of Nice, France. Inclusion criteria are patients aged 18 and over, suffering from abdominal pain for seven days or less and requiring a blood test to help with diagnosis. The primary outcome is to determine if the value of venous lactate is a predictive factor of emergency surgery in patients with acute abdominal pain. The secondary outcome is to determine if the "strong ion gap", first defined in "The Stewart Approach", is a predictive factor of emergency surgery in patients with acute abdominal pain. A blood test will be performed when patients are admitted to the ED. Seven days after being admitted to the ED, patients' outcome will be assessed by consulting patients' medical records or by phone call.