The use of the Hellige Oxymonitor to study skin blood flow changes

Area of Science:

• Physiology
• Biophysics
• Clinical Medicine

Background:

• Transcutaneous oxygen tension (tcPO2) is influenced by multiple factors including skin blood flow, respiration, and oxygen concentration.
• While tcPO2 is flow-related, it is not directly proportional to skin blood flow due to complex physiological and physical chemistry interactions.
• Understanding these dependencies is crucial for accurate interpretation in clinical settings.

Purpose of the Study:

• To analyze the physiological and physical chemistry principles governing transcutaneous oxygen tension.
• To demonstrate the utility of tcPO2 measurements at 37°C for assessing skin blood flow.
• To establish the relationship between blood flow and oxygen tension under specific physiological conditions.

Main Methods:

• Analysis of oxygen consumption and diffusion physiology.
• Application of clearance principles to relate blood flow, respiration, and oxygen concentration differences.
• Measurement of tcPO2 using a polarographic oxygen electrode at a controlled temperature of 37°C.
• Correction for oxyhemoglobin dissociation and respiration kinetics.

Main Results:

• tcPO2 measurement at 37°C allows clear demonstration of changes in skin blood flow.
• Skin blood flow is inversely proportional to the difference between arterial and venous blood oxygen concentrations when skin respiration is constant and tissue oxygen tension exceeds 2 mm Hg.
• The study validates that tissue respiration is independent of tissue blood flow under specific conditions.

Conclusions:

• Transcutaneous oxygen tension (tcPO2) measurement at 37°C is a clinically useful tool for evaluating skin blood flow.
• The relationship between blood flow and oxygen tension is well-defined, allowing for diagnostic applications.
• Accurate tcPO2 assessment requires consideration of multiple physiological and environmental factors.