Related Experiment Video
Updated: Sep 9, 2025
09:09
Description of a Swine Infant Model of Volume-Controlled Hemorrhagic Shock
Published on: November 3, 2023
1.1K
Acute Normovolemic Hemodilution in Adult Cardiac Surgery
Kenichi A Tanaka1, Kenneth E Stewart1,2, Kofi B Vandyck1
1Department of Anesthesiology, University of Oklahoma Health Sciences Center, Oklahoma City.
JAMA Surgery
|September 3, 2025
Summary
Acute normovolemic hemodilution (ANH) reduces blood transfusions in cardiac surgery patients. This safe and cost-effective blood conservation technique is underused despite proven benefits in reducing red blood cell and non-RBC component use.
Area of Science:
- Cardiovascular Surgery
- Anesthesiology
- Blood Transfusion Medicine
Background:
- Acute normovolemic hemodilution (ANH) is an established blood conservation method.
- Its adoption in the US is low, particularly in cardiac surgery, the largest consumer of blood products.
- Declining blood supply necessitates reassessment of ANH's effectiveness.
Purpose of the Study:
- To evaluate the impact of ANH on perioperative transfusion and blood component use.
- To assess ANH in patients undergoing cardiopulmonary bypass (CPB) during cardiac surgery.
Main Methods:
- Retrospective propensity-score matched cohort study using the STS Adult Cardiac Surgery Database (v4.20.2).
- Included adult patients undergoing CABG and/or valve surgery with CPB (July 2020 - September 2023).
- Primary exposure: ANH; Primary outcome: intraoperative/postoperative transfusion; Secondary outcomes: component use, reexploration, ICU stay, costs.
Main Results:
- ANH was used in 14.7% of 16,795 patients, associated with lower preoperative anemia and higher baseline hematocrit.
- After matching, ANH use significantly reduced transfusion rates (31.2% vs 36.4%, P<.001).
- ANH lowered odds of any transfusion by 27% (OR 0.73); high-volume ANH (≥650 mL) reduced odds by 47-64%, decreasing RBC and non-RBC component use and associated costs.
Conclusions:
- A volume-dependent association exists between ANH and reduced transfusion rates in cardiac surgery.
- ANH is safe, cost-effective, and demonstrably reduces blood component use.
- Despite evidence, ANH remains underutilized as a blood conservation strategy in cardiac surgery.
Related Concept Videos
01:28Cardiomyopathy VII: Pre and Post Operative Nursing Management
27
Patients with hypertrophic cardiomyopathy (HCM) and left ventricular outflow tract (LVOT) obstruction who remain symptomatic despite optimal medical therapy may undergo a septal myectomy (Morrow procedure). This procedure involves excising a portion of the hypertrophied septum below the aortic valve using a heart-lung machine to improve blood flow through the LVOT. Effective preoperative and postoperative nursing management ensures successful patient outcomes, minimizes complications, and...
27
01:24Hemodialysis II: Procedure and Complications
128
DialyzersA hemodialysis (HD) dialyzer is a plastic cartridge containing thousands of parallel hollow fibers, which serve as semipermeable membranes. These fibers are typically made from cellulose-based or other synthetic materials. During HD, blood is pumped into the top of the cartridge and distributed among these fibers. Simultaneously, dialysis fluid, known as dialysate, is introduced into the bottom of the cartridge, bathing the outside of the fibers. Across the semipermeable membrane,...
128