Membrane microdialysis: Evaluation of a new method to assess splanchnic tissue metabolism

Knuesel, Rafael; Takala, Jukka; Brander, Lukas; Haenggi, Matthias; Bracht, Hendrik; Porta, Francesca; Jakob, Stephan M (2006). Membrane microdialysis: Evaluation of a new method to assess splanchnic tissue metabolism. Critical care medicine, 34(10), pp. 2638-45. Baltimore, Md.: Lippincott Williams & Wilkins 10.1097/01.CCM.0000239430.73826.23

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OBJECTIVE: Measuring peritoneal lactate concentrations could be useful for detecting splanchnic hypoperfusion. The aims of this study were to evaluate the properties of a new membrane-based microdialyzer in vitro and to assess the ability of the dialyzer to detect a clinically relevant decrease in splanchnic blood flow in vivo. DESIGN: A membrane-based microdialyzer was first validated in vitro. The same device was tested afterward in a randomized, controlled animal experiment. SETTING: University experimental research laboratory. SUBJECTS: Twenty-four Landrace pigs of both genders. INTERVENTIONS: In vitro: Membrane microdialyzers were kept in warmed sodium lactate baths with lactate concentrations between 2 and 8 mmol/L for 10-120 mins, and microdialysis lactate concentrations were measured repeatedly (210 measurements). In vivo: An extracorporeal shunt with blood reservoir and roller pump was inserted between the proximal and distal abdominal aorta, and a microdialyzer was inserted intraperitoneally. In 12 animals, total splanchnic blood flow (measured by transit time ultrasound) was reduced by a median 43% (range, 13% to 72%) by activating the shunt; 12 animals served as controls. MEASUREMENTS AND MAIN RESULTS: In vitro: The fractional lactate recovery was 0.59 (0.32-0.83) after 60 mins and 0.82 (0.71-0.87) after 90 mins, with no further increase thereafter. At 60 and 90 mins, the fractional recovery was independent of the lactate concentration. In vivo: Abdominal blood flow reduction resulted in an increase in peritoneal microdialysis lactate concentration from 1.7 (0.3-3.8) mmol/L to 2.8 (1.3-6.2) mmol/L (p = .006). At the same time, mesenteric venous-arterial lactate gradient increased from 0.1 (-0.2-0.8) mmol/L to 0.3 (-0.3 -1.8) mmol/L (p = .032), and mesenteric venous-arterial Pco2 gradients increased from 12 (8-19) torr to 21 (11-54) torr (p = .005). CONCLUSIONS: Peritoneal membrane microdialysis provides a method for the assessment of splanchnic ischemia, with potential for clinical application.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Intensive Care, Emergency Medicine and Anaesthesiology (DINA) > Clinic of Intensive Care
UniBE Contributor:	Takala, Jukka, Brander, Lukas, Hänggi, Matthias, Jakob, Stephan
ISSN:	0090-3493
ISBN:	16915109
Publisher:	Lippincott Williams & Wilkins
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 14:48
Last Modified:	05 Dec 2022 14:14
Publisher DOI:	10.1097/01.CCM.0000239430.73826.23
PubMed ID:	16915109
Web of Science ID:	000240795700019
URI:	https://boris.unibe.ch/id/eprint/19942 (FactScience: 3020)