Reflection and transmission pulse oximetry during compromised peripheral perfusion.

Area of Science:

• Medical Devices
• Cardiovascular Surgery
• Physiological Monitoring

Background:

• Open-heart surgery presents unique challenges for monitoring patient vitals.
• Low cardiac output and high vascular resistance can impair peripheral circulation.
• Accurate real-time physiological data is crucial during complex surgical procedures.

Purpose of the Study:

• To compare the performance of reflection and transmission pulse oximeters during open-heart surgery.
• To evaluate sensor accuracy and reliability under conditions of compromised circulation.
• To determine the optimal pulse oximetry method for extracorporeal circulation (ECC).

Main Methods:

• Performance assessment of reflection and transmission pulse oximeters.
• Data collection during open-heart surgery, including periods of partial and full extracorporeal circulation (ECC).
• Comparison of readings for accuracy and ability to obtain data under low-flow conditions.

Main Results:

• Both sensors showed comparable accuracy for saturation data.
• Reflection oximeters provided earlier readings and readings at lower pulse pressures during partial ECC.
• Reflection sensors maintained readings in patients where transmission sensors failed during partial ECC.
• Heart rate (HR) accuracy was comparable before ECC, with reflection sensors showing better correlation to electrocardiographic HR during partial ECC.

Conclusions:

• Pulse oximetry accuracy for saturation and HR is comparable between reflection and transmission methods.
• Reflection pulse oximeters demonstrate superior performance in obtaining readings during compromised peripheral circulation.
• Reflection sensors are recommended for use during open-heart surgery, particularly during extracorporeal circulation.