Evaluation of pulse oximetry in horses surgically treated for colic.
Abstract: All 43 horses anaesthetised for colic surgery were premedicated with xylazine or diazepam. Anaesthesia was induced with guaifenesin and ketamine, horses were placed in dorsal recumbency and anaesthesia was maintained with isoflurane in oxygen and mechanical ventilation. Haemoglobin saturation readings (SpO2) were taken with a pulse oximeter and compared with computed haemoglobin saturation (SaO2) from arterial blood samples. Readings were taken over a range of SaO2 of 78-100%, mean arterial blood pressure ranged from 24 to 108 mmHg and PaO2 ranged from 53 to 490 mmHg. Analysis of 107 readings showed that SpO2 values predicted SaO2 but time, blood pressure and individual horse did not. Correlation coefficients between SpO2 and SaO2 were 0.85 for all values and 0.88 for values at 30 min. Values for bias and precision were calculated for all SpO2 values and for readings separated into 3 saturation groups: normal, low normal, and abnormal. The pulse oximeter tended to underestimate SaO2 at all times, and was less precise as the saturation decreased.
Publication Date: 1994-03-01 PubMed ID: 8575371DOI: 10.1111/j.2042-3306.1994.tb04347.xGoogle Scholar: Lookup
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- Journal Article
Summary
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This research studied the accuracy of pulse oximetry in horses that underwent surgery for colic. It showed that the pulse oximeter could predict blood oxygen saturation, but its precision decreased when the saturation was low.
Research Methodology
- The study involved 43 horses that had undergone surgery for colic. All were given premedication with xylazine or diazepam.
- Anaesthesia was brought about using guaifenesin and ketamine, after which the horses were placed in a dorsal recumbency position. The anaesthesia was kept in place using isoflurane in oxygen and with the help of mechanical ventilation.
- The researchers used a pulse oximeter to obtain readings of hemoglobin saturation (SpO2), which they then compared with the computed hemoglobin saturation (SaO2) from arterial blood samples. These readings were taken in a range of SaO2 between 78% and 100%.
- In addition, mean arterial blood pressure was measured, which varied from 24 to 108 mmHg, and PaO2 was in the range from 53 to 490 mmHg.
Findings and Analysis
- Analysis of 107 readings revealed that SpO2 values could predict SaO2 levels. However, the time taken, blood pressure, and individual horse factors did not influence the results.
- The research found correlation coefficients between SpO2 and SaO2 to be 0.85 for all values and 0.88 for values at the 30-minute mark.
- The researchers divided the readings into three saturation groups — normal, low normal, and abnormal — for which they calculated bias and precision values.
- The pulse oximeter was found to underestimate SaO2 at all time points and was measured to be less precise as the saturation decreased.
Implications of the Research
- The findings suggest that pulse oximeters provide reliable estimates of arterial oxygen saturation in the normal to high saturation ranges in horses under anaesthesia.
- However, reliance on pulse oximetry for accurate measurements in low saturation levels could be risky due to decreased precision at these levels.
Cite This Article
APA
Matthews NS, Hartsfield SM, Sanders EA, Light GS, Slater MS.
(1994).
Evaluation of pulse oximetry in horses surgically treated for colic.
Equine Vet J, 26(2), 114-116.
https://doi.org/10.1111/j.2042-3306.1994.tb04347.x Publication
Researcher Affiliations
- Department of Small Animal Medicine and Surgery, Texas A & M University, College Station 77843-4474, USA.
MeSH Terms
- Analysis of Variance
- Anesthesia / veterinary
- Anesthetics, Dissociative / administration & dosage
- Animals
- Blood Gas Analysis / veterinary
- Blood Pressure / physiology
- Colic / surgery
- Colic / veterinary
- Female
- Guaifenesin / administration & dosage
- Hemoglobins / analysis
- Horse Diseases / blood
- Horse Diseases / physiopathology
- Horse Diseases / surgery
- Horses
- Ketamine / administration & dosage
- Male
- Oximetry / standards
- Oximetry / veterinary
- Oxygen / blood
- Prospective Studies
Citations
This article has been cited 1 times.- Koenig J, McDonell W, Valverde A. Accuracy of pulse oximetry and capnography in healthy and compromised horses during spontaneous and controlled ventilation. Can J Vet Res 2003 Jul;67(3):169-74.
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