scholarly journals Changes in tissue oxygen tension, venous saturation, and Fick-based assessments of cardiac output during hyperoxia

2018 ◽  
Vol 63 (1) ◽  
pp. 93-100 ◽  
Author(s):  
Dorothy A. Perry ◽  
Lindsay M. Thomson ◽  
Frank A. Pigula ◽  
Brian D. Polizzotti ◽  
James A. DiNardo ◽  
...  
Keyword(s):  
Cardiac Output ◽  
Oxygen Tension ◽  
Tissue Oxygen Tension ◽  
Tissue Oxygen

Oxygen tension in the bladder epithelium rises in both high and low cardiac output endotoxemic sepsis

1995 ◽  
Vol 79 (6) ◽  
pp. 1878-1882 ◽  
Author(s):  
D. M. Rosser ◽  
R. P. Stidwill ◽  
D. Jacobson ◽  
M. Singer
Keyword(s):  
Cardiac Output ◽  
Oxygen Tension ◽  
Anaerobic Respiration ◽  
Tissue Oxygen Tension ◽  
Sprague Dawley ◽  
Tissue Oxygen ◽  
Bladder Epithelium ◽  
Low Cardiac Output ◽  
Group A ◽  
Group B

The effect of endotoxin on tissue oxygen tension measured at the bladder epithelium was assessed in spontaneously breathing Sprague-Dawley rats anesthetized with halothane. Hyperdynamic (high cardiac output, group A, n = 6) and hypodynamic (low cardiac output, group B, n = 6) circulatory responses were achieved by intravenous administration of Escherichia coli lipopolysaccharide, 10 mg/kg over 30 min or 20 mg/kg over 1 min, respectively. Comparison was made against sham-operated control rats (group C, n = 6). Aortic and renal blood flows increased in group A and fell in group B (P < 0.001). However, in both groups, bladder epithelial oxygen tension rose significantly compared with control (P < 0.01), despite an increasing metabolic acidosis. This is in contradistinction to previous studies of nonseptic insults where bladder epithelial oxygen tension fell in line with an increasing arterial base deficit. If a raised tissue oxygen tension could be demonstrated in other organ beds, this would suggest that decreased utilization of oxygen rather than reduced tissue oxygen availability is responsible for the apparent anaerobic respiration seen in sepsis.

scholarly journals Metoprolol Reduces Cerebral Tissue Oxygen Tension after Acute Hemodilution in Rats

2009 ◽  
Vol 111 (5) ◽  
pp. 988-1000 ◽  
Author(s):  
Tenille E. Ragoonanan ◽  
W Scott Beattie ◽  
C David Mazer ◽  
Albert K.Y. Tsui ◽  
Howard Leong-Poi ◽  
...  
Keyword(s):  
Heart Rate ◽  
Blood Flow ◽  
Cardiac Output ◽  
Cerebral Blood Flow ◽  
Oxygen Tension ◽  
Tissue Oxygen Tension ◽  
Beta Blockade ◽  
Tissue Oxygen ◽  
Cerebral Tissue ◽  
Protein Levels

Background Perioperative beta-blockade and anemia are independent predictors of increased stroke and mortality by undefined mechanisms. This study investigated the effect of beta-blockade on cerebral tissue oxygen delivery in an experimental model of blood loss and fluid resuscitation (hemodilution). Methods Anesthetized rats were treated with metoprolol (3 mg x kg) or saline before undergoing hemodilution with pentastarch (1:1 blood volume exchange, 30 ml x kg). Outcomes included cardiac output, cerebral blood flow, and brain (PBrO2) and kidney (PKO2) tissue oxygen tension. Hypoxia inducible factor-1alpha (HIF-1alpha) protein levels were assessed by Western blot. Systemic catecholamines, erythropoietin, and angiotensin II levels were measured. Results Hemodilution increased heart rate, stroke volume, cardiac output (60%), and cerebral blood flow (50%), thereby maintaining PBrO2 despite an approximately 50% reduction in blood oxygen content (P &lt; 0.05 for all). By contrast, PKO2 decreased (50%) under the same conditions (P &lt; 0.05). Beta-blockade reduced baseline heart rate (20%) and abolished the compensatory increase in cardiac output after hemodilution (P &lt; 0.05). This attenuated the cerebral blood flow response and reduced PBrO2 (50%), without further decreasing PKO2. Cerebral HIF-1alpha protein levels were increased in beta-blocked hemodiluted rats relative to hemodiluted controls (P &lt; 0.05). Systemic catecholamine and erythropoietin levels increased comparably after hemodilution in both groups, whereas angiotensin II levels increased only after beta-blockade and hemodilution. Conclusions Cerebral tissue oxygen tension is preferentially maintained during hemodilution, relative to the kidney, despite elevated systemic catecholamines. Acute beta-blockade impaired the compensatory cardiac output response to hemodilution, resulting in a reduction in cerebral tissue oxygen tension and increased expression of HIF-1alpha.

Hypercapnia Improves Tissue Oxygenation

2002 ◽  
Vol 97 (4) ◽  
pp. 801-806 ◽  
Author(s):  
Ozan Akça ◽  
Anthony G. Doufas ◽  
Nobutada Morioka ◽  
Steve Iscoe ◽  
Joseph Fisher ◽  
...  
Keyword(s):  
Cardiac Output ◽  
Oxygen Tension ◽  
Tissue Oxygenation ◽  
Subcutaneous Tissue ◽  
Peripheral Tissue ◽  
Tissue Oxygen Tension ◽  
Wound Infections ◽  
Tissue Oxygen ◽  
Healthy Human ◽  
Surgical Infection

Background Wound infections are common, serious, surgical complications. Oxidative killing by neutrophils is the primary defense against surgical pathogens and increasing intraoperative tissue oxygen tension markedly reduces the risk of such infections. Since hypercapnia improves cardiac output and peripheral tissue perfusion, we tested the hypothesis that peripheral tissue oxygenation increases as a function of arterial carbon dioxide tension (PaCO(2)) in anesthetized humans. Methods General anesthesia was induced with propofol and maintained with sevoflurane in 30% oxygen in 10 healthy volunteers. Subcutaneous tissue oxygen tension (PsqO(2)) was recorded from a subcutaneous tonometer. An oximeter probe on the upper arm measured muscle oxygen saturation. Cardiac output was monitored noninvasively. PaCO(2) was adjusted to 20, 30, 40, 50, or 60 mmHg in random order with each concentration being maintained for 45 min.(2) (2) Results Increasing PaCO(2) linearly increased cardiac index and PsqO(2) : PsqO(2) = 35.42 + 0.77 (PaCO(2)), &lt; 0.001. Conclusions The observed difference in PsqO(2) is clinically important because previous work suggests that comparable increases in tissue oxygenation reduced the risk of surgical infection from -8% to 2 to 3%. We conclude that mild intraoperative hypercapnia increased peripheral tissue oxygenation in healthy human subjects, which may improve resistance to surgical wound infections.

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