The goal of this observational study is to determine the value of CRP/Albumin Ratio as an inflammatory marker for predicting the development of postoperative Systemic Inflammatory Response Syndrome and/or Sepsis in polytraumatized patients admitted to Intensive care unit.

The main question it aims to answer is whether CRP/Albumin Ratio can be used as predictive inflammatory marker for postoperative Systemic Inflammatory Response Syndrome and/or Sepsis or not.

The development of postoperative Systemic Inflammatory Response Syndrome (SIRS) or Sepsis is a very serious complication that has been associated with high morbidity, mortality, and increased length of inpatient stay.

Sepsis is a life-threatening organ dysfunction caused by a dysregulated host response to infection.

As surgical interventions lead to well-understood metabolic, neuroendocrine, and immune responses, the stress responses to surgery contribute to increased postoperative complications mostly caused by increased levels of Pro-inflammatory cytokines in response to surgical injury, which leads to changes of circulating acute phase proteins, such as albumin and C-reactive protein (CRP).

The CRP to albumin ratio (CAR) is a new index calculated by dividing CRP by the albumin level. It has been assumed to have predictive value in determining morbidity and mortality in many critical diseases.

Inclusion Criteria:

• Patients classified by American Society of Anesthesiologists physical status (ASA) as I to III.
• Both sex.
• Aged ≥ 18 years old.
• Polytraumatized patients (fulfilling the 'New Berlin definition' of Polytrauma patient which includes Abbreviated Injury Scale (AIS) ≥3 for two or more different body regions with one or more of the following five physiological variables: Disturbed level of consciousness, hypotension, coagulopathy, acidosis and age >70y).
• Admitted to Intensive Care Unit preoperatively or postoperatively. • Surgical intervention within 48 hours of the onset of Trauma.

Exclusion Criteria:

• Patients who used immunosuppressive therapy and chemotherapy.
• Patients with known hematological disorders or malignancy.
• Patients with known liver cirrhosis classified as Child- Pugh C ( serum Albumin < 2.8 mg/dl or International Normalized Ratio > 2.2 ) (Tsoris , et al.,2023) or liver cell failure.
• Patients receiving Albumin Supplementation during the period of the study.
• Age < 18y.

• Patients classified by American Society of Anesthesiologists physical status (ASA) as I to III.
• Both sex.
• Aged ≥ 18 years old.
• Polytraumatized patients (fulfilling the 'New Berlin definition' of Polytrauma patient which includes Abbreviated Injury Scale (AIS) ≥3 for two or more different body regions with one or more of the following five physiological variables: Disturbed level of consciousness, hypotension, coagulopathy, acidosis and age >70y).
• Admitted to Intensive Care Unit preoperatively or postoperatively. • Surgical intervention within 48 hours of the onset of Trauma.