Prognostic Value of Soluble Urokinase Plasminogen Activation Receptor (SUPAR) to Rule Out Complications in Patients Admitted in Emergency Department for Acute Abdominal Pain.

Study Overview
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Brief Summary
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Soluble Urokinase Plasminogen Activation Receptor (SUPAR) is a validated biomarker with applications in the study of inflammation and infection. Elevated levels of SUPAR have recently been linked to a higher mortality in patients suffering from undifferentiated sepsis, pneumonia, and more recently, COVID-19 infection. Large randomized controlled trials have been conducted on patients admitted to the emergency department (ER), regardless of the reason for admittance. These studies have stratified risk based on three cutoffs at initial measurement: Low risk : < 3 ng/mL Intermediate risk : entre 3 et 6 ng/mL High risk : > 6 ng/mL Low levels of SUPAR are associated with low risk of mortality in the short and long term in patients presenting to the ED, no matter the reason for admittance. Risk stratification could be an added decision-making tool for clinicians to comfort hospital discharge. To the best of our knowledge, there is no available data on the added value of SUPAR for predicting mortality in abdominal sepsis and abdominal pain. Abdominal pain is responsible for 10 to 30 % of ER admissions. Consequently, abdominal pain is then responsible for roughly 10 % of admissions into medical and surgical wards. Mortality varies depending on patient factors. Mortality is usually stratified on age. In patients under 50 years of age, it is near 8%, but it reaches 19 % in patients over 50. Diagnostic accuracy also decreases drastically with age, reaching approximately 30 % patients over 75. Taking this into account, integrating a measure of SUPAR levels into the current standard of care could stratify the risk of complications in patients admitted to the ER with abdominal pain.

Official Title
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Prognostic Value of Soluble Urokinase Plasminogen Activation Receptor (SUPAR) to Rule Out Complications in Patients Admitted in Emergency Department for Acute Abdominal Pain.

Conditions
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Soluble Urokinase Plasminogen Activation Receptor, Abdominal Pain, Emergency Department, Mortality

Intervention / Treatment
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* Diagnostic Test: Soluble Urokinase Plasminogen Activation Receptor measurement


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients : Over 18 years of age Presenting to the ED with abdominal pain for over an hour Classified as category 2 or above on the CIMU or FRENCH severity scale Necessitating bloodwork at the discretion of the consulting physician Who gave his Non-opposition after clear and fair information on the study Exclusion Criteria: Patients : With pain evocative of kidney stones With a chronic inflammatory disease: HIV infection, inflammatory bowel disease, rheumatoid arthritis, cancer Chronic renal disease Under hospice care Intubated Unstable hemodynamically Transferred from a secondary care facility and having undergone previous bloodwork Patient unable to understand the information and to give his non-objection under guardianship, curatorship or subordination; benefiting from enhanced protection, namely: minors, persons deprived of their liberty by a judicial or administrative decision, persons staying in an establishment health or social, adults under legal protection

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Soluble Urokinase Plasminogen Activation Receptor measurement<br> | Diagnostic Test: Soluble Urokinase Plasminogen Activation Receptor measurement<br>* In addition to the standard of care, Soluble Urokinase Plasminogen Activation Receptor levels will be measured in patients.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Occurrence of medical and surgical complications within 7 days | 7 -day complications as a composite outcome of either: Necessity of surgical intervention Hospitalisation lasting over 24 hours Death in direct relation to the reason for admittance Hospital readmission for abdominal pain in a similar abdominal quadrant | 7 days | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Occurrence of medical and surgical complications within 30 days | 30 -day complications as a composite outcome of either: Necessity of surgical intervention Hospitalisation lasting over 24 hours Death in direct relation to the reason for admittance Hospital readmission for abdominal pain in a similar abdominal quadrant | 30 days | 
| Optimal cutoff | Determining optimal cutoffs for Soluble Urokinase Plasminogen Activation Receptor through Area Under Curve using Receiver Operating Characteristic method for patients presenting complications of abdominal pain in the first seven days. | 7 days | 
| Comparison with routine biomarkers | Comparison of diagnostic performance with other routine biomarkers: Procalcitonine C-Reactive Protein Lactate | 30 days |