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Comparison of Non-invasive and Invasive Arterial Blood Pressure Measurement for Assessment of Dynamic Cerebral Autoregulation

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dc.contributor.author Petersen, Nils
dc.contributor.author Ortega-Gutiérrez, Santiago
dc.contributor.author Reccius, Andrés
dc.contributor.author Masurkar, Arjun
dc.contributor.author Huang, Amy
dc.contributor.author Marshall, Randolph
dc.date.accessioned 2017-03-14T14:30:23Z
dc.date.available 2017-03-14T14:30:23Z
dc.date.issued 2014
dc.identifier.citation Neurocrit Care. 2014 February ; 20(1): p:60–68 es_CL
dc.identifier.uri http://dx.doi.org/10.1007/s12028-013-9898-y es_CL
dc.identifier.uri http://hdl.handle.net/11447/1024
dc.description.abstract BACKGROUND: There is a growing interest in measuring cerebral autoregulation in patients with acute brain injury. Non-invasive finger photo-plethysmography (Finapres) is the method of choice to relate arterial blood pressure to changes in cerebral blood flow. Among acutely ill patients, however, peripheral vasoconstriction often limits the use of Finapres requiring direct intravascular blood pressure measurement. We evaluated how these two different forms of blood pressure monitoring affect the parameters of dynamic cerebral autoregulation (DCA). METHODS: We performed 37 simultaneous recordings of BP and cerebral blood flow velocity in 15 patients with acute brain injury. DCA was estimated in the frequency domain using transfer function analysis to calculate phase shift, gain, and coherence. In addition the mean velocity index (Mx) was calculated for assessment of DCA in the time domain. RESULTS: The mean patient age was 58.1 ± 15.9 years, 80 % (n = 12) were women. We found good inter-method agreement between Finapres and direct intravascular measurement using Bland-Altman and correlation analyses. Finapres gives higher values for the efficiency of dynamic CA compared with values derived from radial artery catheter, as indicated by biases in the phase (26.3 ± 11.6° vs. 21.7 ± 10.5°, p = 0.001) and Mx (0.571 ± 0.137 vs. 0.649 ± 0.128, p < 0.001). Gain in the low frequency range did not significantly differ between the two arterial blood pressure methods. The average coherence between CBFV and ABP was higher when BP was measured with arterial catheter for frequencies above 0.05 Hz (0.8 vs. 0.73, p < 0.001). CONCLUSION: Overall, both methods yield similar results and can be used for the assessment of DCA. However, there was a small but significant difference for both mean Mx and phase shift, which would need to be adjusted for during monitoring of patients when using both methods. When available, invasive arterial blood pressure monitoring may improve accuracy and thus should be the preferred method for DCA assessment in the ICU. es_CL
dc.format.extent 17 es_CL
dc.language.iso en_US es_CL
dc.publisher Springer es_CL
dc.subject dynamic cerebral autoregulation es_CL
dc.subject cerebral blood flow es_CL
dc.subject transcranial Doppler ultrasound es_CL
dc.subject arterial blood pressure es_CL
dc.subject Finapres es_CL
dc.subject transfer function analysis es_CL
dc.title Comparison of Non-invasive and Invasive Arterial Blood Pressure Measurement for Assessment of Dynamic Cerebral Autoregulation es_CL
dc.type Artículo es_CL


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