In this study, we want to find out if measuring carbon dioxide from a patient's breath (end-tidal COâ‚‚ or ETCOâ‚‚) can reliably reflect changes in blood carbon dioxide levels (arterial COâ‚‚ or PaCOâ‚‚) during lung surgery. Instead of just looking at individual values, we are specifically investigating whether ETCOâ‚‚ and PaCOâ‚‚ rise and fall in the same direction over time. During lung surgery, patients often need "one-lung ventilation," where only one lung is used for breathing while the other is deflated to help the surgeon. This can cause carbon dioxide levels in the blood to change, which are typically monitored by taking blood samples. If ETCOâ‚‚ trends closely follow PaCOâ‚‚ trends, doctors may not need to take as many blood samples. Patients in this study will already have a small tube in an artery for monitoring blood pressure. Whenever a blood test is taken, we will compare the blood COâ‚‚ level with the ETCOâ‚‚ reading at that moment. We will also track heart rate, blood pressure, and body temperature. By comparing these measurements, we hope to learn whether ETCOâ‚‚ reliably follows the same trends as PaCOâ‚‚, making it a useful tool for monitoring carbon dioxide levels in lung surgery with fewer blood tests.
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Trend correlation between ETCOâ‚‚ and PaCOâ‚‚ measured by the concordance ratio in the four-quadrant plot
Timeframe: During the surgery of the patient, arterial blood gas samples will be drawn at the anesthesiologist's discretion whenever clinically indicated.
Trend correlation between ETCOâ‚‚ and PaCOâ‚‚ measured by the angular bias in the four-quadrant plot
Timeframe: During the surgery of the patient, arterial blood gas samples will be drawn at the anesthesiologist's discretion whenever clinically indicated.
Trend correlation between ETCOâ‚‚ and PaCOâ‚‚ measured by radial limits of aggreement in the four-quadrant plot
Timeframe: During the surgery of the patient, arterial blood gas samples will be drawn at the anesthesiologist's discretion whenever clinically indicated.