Liposome‐encapsulated hemoglobin (HbV) transfusion rescues rats undergoing progressive lethal 85% hemorrhage as a result of an anti‐arrhythmogenic effect on the myocardium. Issue 11 (16th July 2021)

• Record Type: Journal Article
• Authors: Takase, Bonpei; Higashimura, Yuko; Asahina, Haruka; Ishihara, Masayuki; Sakai, Hiromi
• Is Part Of: Artificial organs. Volume 45:Issue 11(2021)
• Page Start: 1391
• Page End: 1404
• Publication Date: 2021-07-16
• Subjects: artificial oxygen carrier -- hemorrhage -- lethal arrhythmia -- resuscitation; Artificial organs -- Periodicals; 617.956
• DOI: 10.1111/aor.14033
• Languages: English
• ISSNs: 0160-564X

Abstract

Abstract: Liposome‐encapsulated hemoglobin vesicles (HbV) can serve as a blood substitute with oxygen‐carrying capacity comparable to that of human blood and lethal hemorrhage is associated with lethal arrhythmias. To investigate the resuscitation effect of HbV on lethal hemorrhage and anti‐arrhythmogenesis, we performed optical mapping analysis (OMP) and electrophysiological study (EPS) in graded blood exchange (85% blood loss) in the rat model. We also measured cardiac autonomic activity, as assessed by heart rate variability (HRV), and changes in plasma norepinephrine and left ventricle ejection fraction (LVEF) by echocardiography. Pathological study on Connexin43 was performed. A 5% albumin (ALB group), washed rat erythrocytes (wRBC group), and HbV (HbV group) were used as a resuscitation fluid. The survival effects over 24 hours were examined. All rats died in the ALB group, whereas almost all survived for 24‐hours period in wRBC and HbV groups. OMP showed impaired action potential duration dispersion (APDd) in the ALB group, whereas normal APDs in HbV and wRBC groups. Lethal arrhythmias were induced by EPS in the ALB group, but not in wRBC and HbV groups. HRV indices, LVEF, Connexin43 were preserved in HbV and wRBC groups. Lethal hemorrhage causes lethal arrhythmias in the presence of impaired APDd. HbV acutely rescues lethal hemorrhage by preventing lethal arrhythmias and preserving arrhythmogenic factors. Abstract : Lethal hemorrhage causes lethal arrhythmias (A) in the presence of impaired action potential duration dispersion (B: APDd). Hemoglobin vesicle (HbV) acutely rescues lethal hemorrhage by preventing lethal arrhythmias (C) and preserving arrhythmogenic factors including impaired APDd (B).