Using the capnogram to assess pulmonary perfusion during a lobectomy: case studies

Area of Science:

• Anesthesiology
• Cardiopulmonary Physiology
• Surgical Monitoring

Background:

• Capnography is a vital non-invasive tool for monitoring respiratory and circulatory function during general anesthesia.
• Lobectomy, a surgical procedure involving lung removal, requires careful assessment of pulmonary circulation.
• Pulmonary artery anastomosis is a critical step in some thoracic surgeries, necessitating precise monitoring.

Purpose of the Study:

• To investigate the significance of a specific capnography waveform observed after lobectomy.
• To determine if capnography can reliably indicate pulmonary artery perfusion status post-lobectomy.
• To highlight the importance of capnography in detecting pulmonary artery obstructions.

Main Methods:

• Case series of four patients undergoing lobectomy.
• Post-operative capnography monitoring.
• Investigation of "chair-like" waveform findings.
• Confirmation of pulmonary artery obstruction through further diagnostic methods.

Main Results:

• A distinct "chair-like" waveform was observed on capnography in four lobectomy cases post-surgery.
• This waveform was associated with suspected pulmonary artery perfusion blockage.
• Subsequent investigations confirmed pulmonary artery obstruction in all observed cases.
• Capnography effectively raised suspicion for pulmonary artery issues.

Conclusions:

• The "chair-like" capnography waveform can serve as an early indicator of pulmonary artery obstruction after lobectomy.
• Capnography is valuable in confirming unobstructed pulmonary circulation following lobectomy.
• Continuous capnography monitoring, especially during one-lung ventilation and in cases of pulmonary artery anastomosis, is crucial.