This study aims to evaluate the prognostic power of the VEXUS Score in predicting mortality among patients with septic shock in intensive care units.

After the diagnosis of septic shock, patients will be assessed for eligibility. Following informed consent, measurements will be taken within the first 4 hours of shock onset, and treatment (inotropic and vasopressor doses, fluid challenge, corticosteroids) will be recorded. A second measurement will occur between 12 and 24 hours, and a third at 72 hours. All treatment and care protocols will be managed according to routine unit protocols.

Data will be systematically collected at three time points (0-4 hours, 12-24 hours, and 72 hours). These will include hemodynamic parameters, laboratory tests (including infection markers), need for renal replacement therapy, mechanical ventilation requirement and duration, cumulative dose and duration of vasopressor use, ICU stay, and survival status.

VEXUS Score Grading

The VEXUS score will be graded as follows:

• Grade 0 (No Congestion): No signs of venous congestion are detected. The inferior vena cava (IVC) diameter is less than 2 cm.
• Grade 1 (Mild Venous Congestion): The IVC diameter is 2 cm or greater. However, hepatic, portal, or renal vein flow measurements exhibit normal waveform patterns, or only one mildly abnormal waveform pattern is present.
• Grade 2 (Moderate Venous Congestion): The IVC diameter is 2 cm or greater. Additionally, analysis of hepatic, portal, or renal vein waveforms reveals one severe congestion finding.
• Grade 3 (Severe Venous Congestion): The IVC diameter is 2 cm or greater. Furthermore, analysis of hepatic, portal, or renal vein waveforms shows two or more severe congestion findings.

Data will be analyzed using SPSS version 23.0, with normality assessed through visual and analytical methods (Kolmogorov-Smirnov/Shapiro-Wilk tests). Continuous variables will be compared using t-tests or Mann-Whitney U tests, and categorical variables using Chi-square tests. ROC analysis will be used to assess the predictive value of VEXUS for mortality.

Inclusion Criteria:

• Age>18
• Patients monitored for septic shock in intensive care unit
• Signed informed consent

Exclusion Criteria:

• Age <18
• Severe obesity precluding adequate ultrasonographic imaging.
• Patients in whom venous structures cannot be clearly assessed via ultrasonography due to anatomical or technical reasons (e.g., adhesions following abdominal surgery).
• Patients receiving dialysis due to chronic kidney disease or initiating dialysis for acute kidney failure.
• Chronic heart failure.
• Patients with advanced valvular insufficiency or advanced pulmonary hypertension.
• Patients with portal hypertension or advanced-stage liver cirrhosis.
• Presence of acute or chronic thrombosis in the inferior vena cava or other venous structures within the scoring area.
• Refusal to participate

Adult patients admitted to the intensive care unit with a diagnosis of septic shock according to Sepsis-3 criteria. Patients will be enrolled consecutively from the intensive care unit of a tertiary care university hospital. Informed consent will be obtained from all patients or their legal representatives.