Observation of ventilation-induced Spo(2) oscillations in pigs: first step to noninvasive detection of cyclic recruitment of atelectasis?

Bodenstein, Marc; Wang, Hemei; Boehme, Stefan; Baumgardner, James E; Duenges, Bastian; Vogt, Andreas; David, Matthias; Markstaller, Klaus (2010). Observation of ventilation-induced Spo(2) oscillations in pigs: first step to noninvasive detection of cyclic recruitment of atelectasis? Experimental lung research, 36(5), pp. 270-6. New York, N.Y.: Informa Healthcare 10.3109/01902140903575971

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High arterial partial oxygen pressure (Pao(2)) oscillations within the respiratory cycle were described recently in experimental acute lung injury. This phenomenon has been related to cyclic recruitment of atelectasis and varying pulmonary shunt fractions. Noninvasive detection of Spo(2) (oxygen saturation measured by pulse oximetry) as an indicator of cyclic collapse of atelectasis, instead of recording Pao(2) oscillations, could be of clinical interest in critical care. Spo(2) oscillations were recorded continuously in three different cases of lung damage to demonstrate the technical feasibility of this approach. To deduce Pao(2) from Spo(2), a mathematical model of the hemoglobin dissociation curve including left and right shifts was derived from the literature and adapted to the dynamic changes of oxygenation. Calculated Pao(2) amplitudes (derived from Spo(2) measurements) were compared to simultaneously measured fast changes of Pao(2), using a current standard method (fluorescence quenching of ruthenium). Peripheral hemoglobin saturation was capable to capture changes of Spo(2) within each respiratory cycle. For the first time, Spo(2) oscillations due to cyclic recruitment of atelectasis within a respiratory cycle were determined by photoplethysmography, a technology that can be readily applied noninvasively in clinical routine. A mathematic model to calculate the respective Pao(2) changes was developed and its applicability tested.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Intensive Care, Emergency Medicine and Anaesthesiology (DINA) > Clinic and Policlinic for Anaesthesiology and Pain Therapy
UniBE Contributor:	Vogt, Andreas
ISSN:	0190-2148
Publisher:	Informa Healthcare
Language:	English
Submitter:	Jeannie Wurz
Date Deposited:	04 Oct 2013 14:08
Last Modified:	05 Dec 2022 14:00
Publisher DOI:	10.3109/01902140903575971
PubMed ID:	20497021
Web of Science ID:	000279398000003
URI:	https://boris.unibe.ch/id/eprint/656 (FactScience: 200053)