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This article examines the critical role of fluid management during cardiac surgery, particularly the effects of different priming solutions and fluid types on patient outcomes. It discusses aspects such as preoperative anemia, perioperative transfusions, and postoperative complications, along with the mechanisms by which fluid choice may influence inflammation and blood damage. Key findings highlight the importance of using colloids in circuit primes and balanced solutions to enhance acid-base status. The review synthesizes various studies to provide insights into best practices for optimizing fluid strategies in this high-risk setting.
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Prime Time !Fluids during Cardiac Surgery Dirk Himpe MD PhD MHE EDIC ZNA Middelheim General Hospital Antwerp Belgium
Factors: .preoperative anemia, .perioperative RBC transfusions .postoperative re-exploration
Weight gain after cardiac surgery < 10 % 10-20 % > 20 % 0 20 40 60 80 100 Mortality % Lowell, CCM 1990 18:728, 1990
Red blood cell Platelet INFLAMMATION Polymer Blood 1994; 4:3175-81
phases: pre-pump-post-ICU targets: interrelated .transfusion/anemia .acid-base status .fluid balance (colloids) .inflammation (SIRS) OR
The “pump”: onset of CPB = massive fluid load bloodvolume + priming solution Htc: 20-25 % 45 % start CPB (few minutes)
Issue: Type of Fluid = Determinant of Outcome ?! (direct or indirect)
Base Excess (mean ± 1.96SEM) Succinyl-linkedGEL in buffered vehicle Albumin-Hartmann Urea-linked GEL in NS Himpe D. et al. JCTVA 1991, 5:457-66
Base Excess (mean ±SD) Hydroxyethyl Starch 6% 130/0.4 in a Balanced Electrolyte Solution (Volulyte) Hydroxyethyl Starch 6% 130/0.4 in NS (Voluven) Base EM. et al. JCTVA 2011, 25:407-14
damage to figured blood elements (foreign surfaces, air, pericardium & pumps)
free haemoglobin -> inflammation 1200 mg/L mechanical stress on blood during CPB 1000 800 electrically charged 4% MFGelatine 4% Albumin 600 6% HES 70/0.5 Normal Saline 400 200 0 120 min baseline Sumpelmann R et al. Anaesthesia 55: 976, 2000
Comparison of types of priming solutions used for CPB with the survival rate of coronary bypass patients. NS I. crystalloid (211 pts) II. 25 % human albumin (217 pts) III. 6% hetastarch (298 pts) IV. 6% hetastarch & 25% human albumin (161 pts) Canver C. C. & Nichols R. D. Chest 2000;118:1616-1620
Conclusions from the available evidence to date: • outcome after cardiac surgery: • there is more than priming fluids between heaven and earth; • but: - always colloids in the CPB prime; - electrically charged colloids may reduce blood damage (inflammation ?); - balanced solutions abolish the CPB acid-base problem; • minimizing volume of extracorporeal circuits may help;