TY - GEN
T1 - Simultaneous measurement of pO2 and perfusion in the rabbit kidney in vivo
AU - O'Connor, Paul M.
AU - Anderson, Warwick P.
AU - Kett, Michelle M.
AU - Evans, Roger G.
PY - 2008/1/1
Y1 - 2008/1/1
N2 - Recently, a combined probe has been developed capable of simultaneous measurement of local tissue pO2 (fluorescence oximetry) and microvascular perfusion (laser Doppler flux) within the same local region. The aim of the current study was to test the utility of these combined probes to measure pO2 and perfusion in the kidney. Studies were performed in anesthetized, artificially ventilated rabbits (n=7). Baseline measurements of renal medullary perfusion and pO2 obtained using combined probes (537± 110 units & 28.7± 6.1mmHg, respectively) were indistinguishable from those obtained using independent probes (435± 102 units & 26.9± 6.4mmHg). Baseline measurements of renal cortical pO2 were also similar between combined (9.7± 1.6mmHg) and independent probes (9.5± 2.3mmHg). Baseline levels of cortical perfusion however, were significantly greater when measured using independent probes (1130± 114units) compared to combined probes (622± 59units; P<0.02). Relative changes in perfusion and pO2 resulting from graded stimulation of the renal nerves were not significantly different when measured using combined probes to those obtained using independent probes. We conclude that combined probes are equally suitable to independent probes for tissue pO2 and microvascular perfusion measurement in the kidney. Our results raise some concerns regarding the accuracy of these OxyLite fluorescence probes for pO2 measurement in the kidney, particularly within the renal cortex.
AB - Recently, a combined probe has been developed capable of simultaneous measurement of local tissue pO2 (fluorescence oximetry) and microvascular perfusion (laser Doppler flux) within the same local region. The aim of the current study was to test the utility of these combined probes to measure pO2 and perfusion in the kidney. Studies were performed in anesthetized, artificially ventilated rabbits (n=7). Baseline measurements of renal medullary perfusion and pO2 obtained using combined probes (537± 110 units & 28.7± 6.1mmHg, respectively) were indistinguishable from those obtained using independent probes (435± 102 units & 26.9± 6.4mmHg). Baseline measurements of renal cortical pO2 were also similar between combined (9.7± 1.6mmHg) and independent probes (9.5± 2.3mmHg). Baseline levels of cortical perfusion however, were significantly greater when measured using independent probes (1130± 114units) compared to combined probes (622± 59units; P<0.02). Relative changes in perfusion and pO2 resulting from graded stimulation of the renal nerves were not significantly different when measured using combined probes to those obtained using independent probes. We conclude that combined probes are equally suitable to independent probes for tissue pO2 and microvascular perfusion measurement in the kidney. Our results raise some concerns regarding the accuracy of these OxyLite fluorescence probes for pO2 measurement in the kidney, particularly within the renal cortex.
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U2 - 10.1007/978-0-387-71764-7-13
DO - 10.1007/978-0-387-71764-7-13
M3 - Conference contribution
C2 - 17727252
AN - SCOPUS:84934442137
SN - 9780387717630
T3 - Advances in Experimental Medicine and Biology
SP - 93
EP - 99
BT - Advances in Experimental Medicine and Biology
PB - Springer New York
ER -