Effect of Relative Decrease in Blood Hemoglobin Concentrations on Postoperative Morbidity in Patients Who Undergo...

Area of Science:

• Surgical Oncology
• Anesthesiology
• Critical Care Medicine

Background:

• Delta hemoglobin (ΔHb), the difference between preoperative and nadir hemoglobin, may indicate adverse outcomes.
• This risk can exist even if hemoglobin remains above the 7 g/dL transfusion threshold.

Purpose of the Study:

• To investigate the association between ΔHb and morbidity after major gastrointestinal surgery.
• To determine if ΔHb is an independent risk factor for complications, or if it acts in conjunction with nadir Hb concentration.

Main Methods:

• Retrospective review of prospectively collected data from patients undergoing pancreatic, hepatic, or colorectal resection.
• Analysis of ΔHb, nadir Hb levels, and perioperative blood use.
• Multivariable-adjusted logistic regression models to assess risk factors and outcomes.

Main Results:

• A ΔHb of 50% or greater was associated with increased risk of postoperative complications.
• Patients with comorbidities and those undergoing pancreatic surgery had a higher risk of ΔHb ≥ 50%.
• A ΔHb ≥ 50% strongly correlated with ischemic complications, irrespective of nadir Hb level.

Conclusions:

• Elevated ΔHb following gastrointestinal surgery is a significant predictor of complications.
• Ischemic adverse events are particularly associated with a high ΔHb, even with adequate nadir Hb levels.
• Monitoring ΔHb is crucial for identifying high-risk patients and preventing adverse outcomes.