Data collection and analysis from a respiratory inductance plethysmograph.

Area of Science:

• Anesthesiology
• Respiratory Physiology
• Medical Instrumentation

Background:

• Narcotic analgesia is commonly used for postoperative pain management.
• Understanding the respiratory effects of these medications is crucial for patient safety.
• Respiratory inductance plethysmography offers a non-invasive method to monitor breathing patterns.

Purpose of the Study:

• To evaluate the respiratory effects of narcotic analgesia in the first 24 hours after surgery.
• To assess the accuracy of Respitrace in measuring respiratory parameters during this period.
• To identify factors influencing the reliability of respiratory monitoring.

Main Methods:

• Utilized a respiratory inductance plethysmograph (Respitrace) for continuous monitoring.
• Collected data online using an Apple microcomputer for analysis of respiratory rates and tidal volumes.
• Analyzed central and obstructive apnea using the phase angle between abdominal and respiratory components.
• Employed data compression techniques to manage large datasets (over 20,000 breaths/patient).

Main Results:

• Respiratory rates were accurately measured breath-by-breath.
• Tidal volume and phase angle measurements were less accurate due to frequent nursing interventions.
• The Respitrace system successfully collected extensive respiratory data.

Conclusions:

• Respitrace can accurately monitor respiratory rates in postoperative patients on narcotic analgesia.
• Nursing interventions can compromise the accuracy of tidal volume and phase angle measurements.
• Further refinement of data collection protocols may be needed to improve accuracy in clinical settings.