Human Albumin for Resuscitation in Surgical Septic Shock: A Randomized Controlled Trial (ALBUS Study)

Official title

A Study of the Additional Human Albumin During Resuscitation in Patients With Surgical Septic Shock in Surgical Intensive Care Units: A Randomized Controlled Trial (The ALBumin Use in Surgical Septic Shock, ALBUS Study)

Overview

This study will test whether giving human albumin to keep the blood albumin level above 3.5 g/dL, in addition to standard care, improves survival in patients with surgical septic shock. Septic shock is a life-threatening complication of infection that often requires urgent surgery and intensive care. Current treatment guidelines recommend intravenous fluids and medications to support blood pressure, but the best type of fluid is still uncertain. Human albumin is a natural protein in the blood that helps maintain fluid balance and has anti-inflammatory effects. Previous studies suggest that low albumin levels are linked with worse outcomes in septic patients, and that albumin infusion might improve recovery, but results are mixed and evidence in surgical septic shock patients is lacking. In this randomized controlled trial, adult patients with surgical septic shock admitted to the surgical intensive care unit will be randomly assigned to receive either standard care alone or standard care plus 20% human albumin solution for up to 3 days. The main outcome is survival at 28 days. Secondary outcomes include length of ICU and hospital stay, need for dialysis, ventilator-free days, vasopressor-free days, fluid balance, gastrointestinal recovery, and adverse reactions. The results of this study will help determine whether targeted albumin replacement is beneficial in critically ill surgical patients with septic shock and could guide future fluid resuscitation strategies.

Detailed description

This is a single-center, randomized, open-label, controlled trial designed to evaluate the effect of targeted albumin replacement in adult patients with surgical septic shock. The study will be conducted in the Surgical Intensive Care Unit at Siriraj Hospital, Bangkok, Thailand.

Eligible patients are those aged 18 years or older admitted with surgical septic shock, defined as suspected or proven surgical infection requiring an operation or surgical intervention within 48 hours, and persisting shock despite adequate initial fluid resuscitation. After informed consent, participants will be randomized in a 1:1 ratio, using block randomization, to one of two groups:

Control group: Standard sepsis management according to international guidelines, including source control, broad-spectrum antibiotics, intravenous crystalloids, vasopressors, and other adjunctive therapies as required.

Intervention group: Standard care plus intravenous 20% human albumin solution, given for up to 72 hours, with dosing guided by serum albumin levels to maintain concentrations above 3.5 g/dL.

The primary endpoint is 28-day all-cause mortality. Secondary endpoints include length of ICU and hospital stay, ventilator-free days, vasopressor-free days, 7-day cumulative fluid balance, acute kidney injury requiring renal replacement therapy, recovery of gastrointestinal function, and adverse reactions.

The planned sample size is 304 patients (152 per arm), which provides 80% power to detect a relative risk reduction of 40% in 28-day mortality (from 35% to 20%) with two-sided alpha of 0.05, accounting for 10% attrition.

Data will be analyzed primarily on an intention-to-treat basis. Interim analysis is planned after 50% enrollment to assess safety and efficacy. Both frequentist and Bayesian approaches will be applied, including logistic regression to adjust for baseline imbalances if needed.

This trial will provide evidence on whether maintaining serum albumin above 3.5 g/dL with human albumin infusion improves survival and clinical outcomes in critically ill patients with surgical septic shock.

Interventions

• Drug Human Albumin 20% Solution
  Intravenous 20% human albumin solution (50 mL per vial). In the experimental arm, patients receive 50 mL over 2 hours on admission, followed by additional doses for up to 72 hours, titrated to maintain serum albumin \>3.5 g/dL. If albumin is 2.5-3.4 g/dL, 1 vial every 12 hours is given; if \<2.5 g/dL, 1 vial every 6 hours is given. Infusion is withheld if there is fluid overload, pulmonary edema, or severe hypernatremia.
• Other Standard Care (in control arm)
  Patients in this group will receive standard sepsis management according to international guidelines. This includes source control, intravenous broad-spectrum antibiotics, balanced crystalloids, vasopressors, and adjunctive therapies (e.g., corticosteroids, thiamine, ventilatory and renal support) as clinically indicated. Albumin may be given if separate indications arise (e.g., perioperative use, severe hypoalbuminemia \<2.5 g/dL with capillary leakage), at the discretion of the treating physic

Primary outcome measures

• 28-Day All-Cause Mortality [Time frame: 28 days after randomization]

Secondary outcome measures (6)

• ICU Length of Stay [Time frame: From ICU admission until ICU discharge or death in the ICU, assessed for up to 90 days.]
• Hospital Length of Stay [Time frame: From hospital admission until hospital discharge or in-hospital death, assessed for up to 90 days.]
• Vasopressor-Free Days [Time frame: 28 days after randomization]
• 7-Day Cumulative Fluid Balance [Time frame: First 7 days after randomization]
• Acute Kidney Injury Requiring Renal Replacement Therapy [Time frame: Up to 28 days after randomization]
• Adverse Reactions [Time frame: Up to 28 days after randomization]

Eligibility criteria

Inclusion criteria

• Adult patients (≥18 years) admitted to the surgical intensive care unit (SICU).
• Diagnosis or suspicion of surgical infection requiring surgery or surgical intervention within 48 hours of ICU admission.
• Septic shock, defined as:
• Mean arterial pressure <65 mmHg after adequate fluid resuscitation or requirement for vasopressors to maintain mean arterial pressure (MAP) ≥65 mmHg for at least 1 hour, and
• Evidence of organ dysfunction (Sequential Organ Failure Assessment (SOFA) score increase ≥2) or signs of tissue hypoperfusion (serum lactate >2 mmol/L, oliguria <0.5 mL/kg/h >2 h, or clinical evidence of poor peripheral perfusion).

Exclusion criteria

• Refusal of consent or do-not-resuscitate (DNR) status.
• More than 24 hours since meeting inclusion criteria.
• Contraindication to albumin infusion or history of severe allergic reaction to albumin.
• Conditions where albumin infusion is already indicated (e.g., large-volume paracentesis >5 L, hepatorenal syndrome, spontaneous bacterial peritonitis, plasmapheresis, cirrhosis, nephrotic syndrome, protein-losing enteropathy, severe burns, post-cardiac or thoracic surgery).
• Evidence of fluid overload or pulmonary edema (bilateral crepitations, chest infiltrates consistent with pulmonary edema, Central Venous Pressure >15 mmHg, Pulmonary Artery Occlusion Pressure \[PAOP\] >18 mmHg, or N-terminal pro-B-type Natriuretic Peptide \[NT-proBNP\] >900 pg/mL)
• End-stage renal disease or receiving chronic renal replacement therapy.
• Pregnancy or breastfeeding.

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: No

Study design

Allocation

Randomized

Model

Parallel assignment

Masking

Open label

Primary purpose

Treatment

Study locations

Thailand · 1 center

• Faculty of Medicine, Siriraj Hospital, Mahidol University — Bangkok

Identifiers

NCT: NCT07212582 · ALBUS_SIRIRAJ

Primary sources (government registries)

• ClinicalTrials.gov (US NIH)

View this study on ClinicalTrials.gov ↗