A comparison of tissue oxygen saturation measurements by 2 different near‐infrared spectroscopy monitors in 21 healthy dogs

Engbers, Sarah; Boysen, Søren; Engbers, Jordan D. T.; Chalhoub, Serge

doi:10.1111/vec.12229

Cited by 12 publications

(10 citation statements)

References 16 publications

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“…Past studies comparing NIRS monitors have highlighted discrepancies in the values obtained at rest and during exercise in human [11][12][13][14] and animal 15 systems. The differences between monitors are likely to be in part associated with the measurement site and spacing of the probes.…”

Section: Introductionmentioning

confidence: 99%

Performance comparison of the MOXY and PortaMon near-infrared spectroscopy muscle oximeters at rest and during exercise

2018

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Abstract. The purpose of the study was to compare muscle oxygenation as measured by two portable, wireless near-infrared spectroscopy (NIRS) devices under resting and dynamic conditions. A recently developed low-cost NIRS device (MOXY) was compared against an established PortaMon system that makes use of the spatially resolved spectroscopy algorithm. The influence of increasing external pressure on tissue oxygen saturation index (TSI) indicated that both devices are stable between 2 and 20 mmHg. However, above this pressure, MOXY reports declining TSI values. Analysis of adipose tissue thickness (ATT) and TSI shows a significant, nonlinear difference between devices at rest. The devices report similar TSI (%) values at a low ATT (<7 mm) (PortaMon minus MOXY difference is þ1.1 AE 2.8%) with the major subsequent change between the devices occurring between 7 and 10 mm; at ATT values >10 mm the difference remains constant (−14.7 AE 2.8%). The most likely explanation for this difference is the small source-detector separation (2.5 cm) in the MOXY resulting in lower tissue penetration into muscle in subjects with higher ATT. Interday test-retest reliability of resting TSI was evaluated on five separate occasions, with the PortaMon reporting a lower coefficient of variation (1.8% to 2.5% versus 5.7% to 6.2%). In studies on male subjects with low ATT, decreases in the TSI were strongly correlated during isometric exercise, arterial occlusion, and incremental arm crank exercise. However, the MOXY reports a greater dynamic range, particularly during ischemia induced by isometric contraction or occlusion (Δ74.3% versus Δ43.7%; hyperemia MAX-occlusion MIN). This study shows that in this subject group both MOXY and PortaMon produce physiologically credible TSI measures during rest and exercise. However, the absolute values obtained during exercise are generally not comparable between devices unless corrected by physiological calibration following an arterial occlusion. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Introductionmentioning

confidence: 99%

Performance comparison of the MOXY and PortaMon near-infrared spectroscopy muscle oximeters at rest and during exercise

2018

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“…All procedures were approved by the Institutional Animal Care and Use Committee and informed client consent was granted prior to enrollment. Dogs presenting to the hospital with shock and weighing >9.0 kg were eligible for inclusion. Shock was defined as the dog meeting at least 2 of the 3 following criteria: shock index of >1.0, a mean arterial blood pressure <60 mm Hg or systolic arterial blood pressure <90 mm Hg, and plasma lactate concentration >2.5 mmol/L.…”

Section: Methodsmentioning

confidence: 99%

“…Patients were placed in right lateral recumbency and a small region (approximately 3 × 3 in) over the sartorius muscle was clipped. The StO 2 probe was placed directly over the muscle belly using an adhesive patch so as to standardize the pressure applied . The measurements were taken continuously over a 30–60 second time span until a steady reading was obtained with a tissue hemoglobin index (THI) ≥5.0.…”

Section: Methodsmentioning

confidence: 99%

“…Although NIRS does not measure microcirculatory blood flow directly, it can detect altered microvascular circulation. In 2 independent evaluations of NIRS in normal dogs, a commercially available tissue spectrometer quantified tissue hemoglobin saturation in the sartorius muscle of dogs with a mean StO 2 of 89.9% in 1 study and 92.9% in another . An experimental study in dogs evaluated StO 2 under conditions of controlled hyperoxemia and hypoxemia and found that StO 2 was significantly decreased when patients were breathing an FiO 2 of 0.10 but was otherwise insensitive to changes in FiO 2 .…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of tissue oxygen saturation in naturally occurring canine shock patients

Berg

Conzemius

Evans

et al. 2019

J Vet Emergen Crit Care

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Objective: To measure tissue oxygen saturation (StO 2 ) in a population of dogs with naturally occurring shock and to evaluate the relationship of StO 2 with an established veterinary severity scoring system (Acute Patient Physiologic and Laboratory Evaluation) and patient survival.Design: Prospective observational study. Setting: University teaching hospital.Animals: Twenty-five adult dogs presenting in shock, as determined by the presence of hypotension, the calculated shock index, and hyperlactatemia. Interventions:StO 2 was measured prior to any therapeutic interventions. Blood samples were also collected for measurement of plasma lactate, complete blood count, and a serum biochemical profile. Abdominal and thoracic focused assessment with sonography was also performed. Measurements and Main Results: Dogs enrolled in this study had lower mean (±SD) StO 2 values (65.12 ± 17.7%) than previously reported in experimental models of canine hemorrhagic shock.There was a moderate correlation between lower StO 2 and increasing Acute Patient Physiologic and Laboratory Evaluation scores. A single StO 2 value, assessed prior to therapeutic intervention, was not a sensitive predictor of mortality in this population.Conclusions: Dogs with naturally occurring shock have lower mean StO 2 values than those previously reported in dogs with experimentally induced shock. A lower initial StO 2 was associated with worse disease severity but was not a significant predictor of survival in this population. K E Y W O R D Sdogs, hypovolemia, illness severity, oxygenation indices

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“…The field of physiological monitoring is ever evolving, and not every technology translates into tools that are reliable in practice settings. It is therefore with great interest that studies by Engbers et al, Holowaychuk et al, and Gommeren et al featured novel monitoring modalities such as near‐infrared spectroscopy, transcutaneous blood gas monitors, and sidestream dark field imaging, respectively. These modalities are of great interest because they may offer greater insight into the body's responses with decreased invasiveness.…”

mentioning

confidence: 99%

Listening to the body's response—A dedication to the teachings of Dr. Steve C. Haskins

Chan¹

2014

J Vet Emergen Crit Care

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A comparison of tissue oxygen saturation measurements by 2 different near‐infrared spectroscopy monitors in 21 healthy dogs

Cited by 12 publications

References 16 publications

Performance comparison of the MOXY and PortaMon near-infrared spectroscopy muscle oximeters at rest and during exercise

Performance comparison of the MOXY and PortaMon near-infrared spectroscopy muscle oximeters at rest and during exercise

Evaluation of tissue oxygen saturation in naturally occurring canine shock patients

Listening to the body's response—A dedication to the teachings of Dr. Steve C. Haskins

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