TY - JOUR
T1 - Retinal venous oxygen saturation correlates with blood volume
AU - Denninghoff, Kurt R.
AU - Smith, Matthew H.
AU - Hillman, Lloyd W.
AU - Redden, David
AU - Rue, Loring W.
PY - 1998/6
Y1 - 1998/6
N2 - Objectives: To evaluate the sensitivity of retinal venous O2 saturation (SrvO2) for early blood loss and reinfusion. A secondary objective was to measure the correlation between SrvO2 and mixed venous O2 saturation (SvO2) during blood loss and reinfusion. Methods: Seven anesthetized swine were bled at 0.8 mL/kg/min to 16 mL/kg. Shed blood was re-infused at the same rate and the swine were allowed to equilibrate. After equilibration, repeat hemorrhages were performed at 1.6 mL/kg/min and 2.4 mL/kg/mm. SrvO2 was measured using an eye oximeter (EOX) and SvO2 was measured using a fiber- optic catheter. Results: During blood loss, SrvO2 correlated with blood removed (r = -0.88, -0.97, -0.96) and SvO2 (r = 0.87, 0.98, 0.92). During reinfusion, SrvO2 correlated with blood re-infused (r = 0.63, 0.76, 0.82) and SvO2 (r = 0.80, 0.93, 0.96). SrvO2 decreased 1.22 ± 0.60%/mL/kg of blood removed. The rate of decrease in SrvO2 per minute (ΔSrvO2) when blood was removed at 2.4 mL/kg/min was significantly greater than ΔSrvO2 when blood was removed at 0.8 mL/kg/min (p < 0.007). The rates of change in blood pressure (BP) and pulse were not significantly different at any rate of blood removal. Conclusions: In this model, retinal venous O2 saturation correlated with blood volume and central venous O2 saturation. Unlike the rate of change in BP and heart rate, ΔSrvO2 values were significantly different at different rates of blood removal. Use of an EOX to monitor for blood loss, estimate the rate of hemorrhage, and evaluate the response to therapy during resuscitation warrants further study.
AB - Objectives: To evaluate the sensitivity of retinal venous O2 saturation (SrvO2) for early blood loss and reinfusion. A secondary objective was to measure the correlation between SrvO2 and mixed venous O2 saturation (SvO2) during blood loss and reinfusion. Methods: Seven anesthetized swine were bled at 0.8 mL/kg/min to 16 mL/kg. Shed blood was re-infused at the same rate and the swine were allowed to equilibrate. After equilibration, repeat hemorrhages were performed at 1.6 mL/kg/min and 2.4 mL/kg/mm. SrvO2 was measured using an eye oximeter (EOX) and SvO2 was measured using a fiber- optic catheter. Results: During blood loss, SrvO2 correlated with blood removed (r = -0.88, -0.97, -0.96) and SvO2 (r = 0.87, 0.98, 0.92). During reinfusion, SrvO2 correlated with blood re-infused (r = 0.63, 0.76, 0.82) and SvO2 (r = 0.80, 0.93, 0.96). SrvO2 decreased 1.22 ± 0.60%/mL/kg of blood removed. The rate of decrease in SrvO2 per minute (ΔSrvO2) when blood was removed at 2.4 mL/kg/min was significantly greater than ΔSrvO2 when blood was removed at 0.8 mL/kg/min (p < 0.007). The rates of change in blood pressure (BP) and pulse were not significantly different at any rate of blood removal. Conclusions: In this model, retinal venous O2 saturation correlated with blood volume and central venous O2 saturation. Unlike the rate of change in BP and heart rate, ΔSrvO2 values were significantly different at different rates of blood removal. Use of an EOX to monitor for blood loss, estimate the rate of hemorrhage, and evaluate the response to therapy during resuscitation warrants further study.
KW - Blood loss
KW - Noninvasive monitoring
KW - Oxygen saturation
KW - Retinal vessel
KW - Shock
KW - Swine
UR - http://www.scopus.com/inward/record.url?scp=0031780740&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0031780740&partnerID=8YFLogxK
U2 - 10.1111/j.1553-2712.1998.tb02464.x
DO - 10.1111/j.1553-2712.1998.tb02464.x
M3 - Article
C2 - 9660283
AN - SCOPUS:0031780740
SN - 1069-6563
VL - 5
SP - 577
EP - 582
JO - Academic Emergency Medicine
JF - Academic Emergency Medicine
IS - 6
ER -