Avaliação preliminar da comparação entre a relação SpO2/FIO2 e PaO2/FIO2 em cães / Preliminary evaluation of the utility of comparing SpO2/FiO2 and PaO2/FiO2ratios in dogs

Original Study

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Preliminary evaluation of the utility of comparing SpO₂/FiO₂ and PaO₂/FiO₂ratios in dogs

1. Janine M. Calabro DVM, DACVECC^1,*,
2. Jennifer E. Prittie DVM, DACVIM, DACVECC¹, 
3. Douglas A. Palma DVM, DACVIM²

Article first published online: 26 APR 2013

DOI: 10.1111/vec.12050

© Veterinary Emergency and Critical Care Society 2013

Issue

Journal of Veterinary Emergency and Critical Care

Volume 23, Issue 3, pages 280–285, May/June 2013

Additional Information(Show All)

Keywords:

• ARDS;
• ALI;
• blood gas analysis;
• noninvasive;
• pulse oximetry

Abstract

Objective

To determine whether the ratio of pulse oximetry saturation/fraction of inspired oxygen (SpO₂/FiO₂, [SF]) correlates with the ratio of partial pressure of oxygen in arterial blood/FiO₂ (PaO₂/FiO₂, [PF]) in dogs.

Design

Prospective, observational pilot study.

Setting

Urban tertiary veterinary referral center.

Animals

Thirty-eight client-owned dogs requiring assessment of oxygenation.

Interventions

None.

Measurements and Main Results

Arterial blood gas analysis with co-oximetry was performed on samples obtained from the dorsal pedal artery. Median SpO₂ was 91.5% (range 80–97%) and median PaO₂ was 70.1 mmHg (range 44.5–103.8 mmHg). Hypoventilation was uncommon and venous admixture was the predominant cause of hypoxemia in this population. Median SF was 435.7 (range 381.0–461.9) and median PF was 334.0 (range 211.9–494.3). Nine dogs (23.6%) had PF <300; no dogs had PF below 200. SF and PF were correlated (ρ = 0.618, P < 0.01).

Conclusions

SF and PF in dogs spontaneously breathing room air have good correlation, suggesting that SF may be a useful, noninvasive surrogate for PF when assessing oxygenation in canine patients. Further studies are warranted to confirm and validate this relationship in spontaneously breathing and mechanically ventilated dogs on varying levels of FiO₂ and to assess the ability of SF to predict outcome.