1. What is Postoperative DLCO?

The postoperative DLCO (ppoDLCO) estimates the predicted diffusing capacity of the lung for carbon monoxide after lung resection surgery. It helps assess the risk of postoperative respiratory complications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{preoperative DLCO} \) — Baseline diffusing capacity before surgery (%)
• \( \text{segments removed} \) — Number of lung segments to be resected
• \( \text{total segments} \) — Total number of lung segments (typically 19)

Explanation: The equation estimates the remaining lung function after resection by calculating the proportion of lung tissue removed.

3. Importance of ppoDLCO Calculation

Details: ppoDLCO is crucial for preoperative risk assessment in lung resection surgery. Values below 40% predict increased risk of postoperative complications.

4. Using the Calculator

Tips: Enter preoperative DLCO (%), number of segments to be removed, and total segments (typically 19). All values must be valid (DLCO > 0, segments removed ≤ total segments).

5. Frequently Asked Questions (FAQ)

Q1: What is a normal preoperative DLCO?
A: Normal DLCO is typically >75% predicted, though this varies by age, sex, and height.

Q2: How many segments are in each lung?
A: Right lung has 10 segments (3 upper, 2 middle, 5 lower). Left lung has 9 segments (5 upper, 4 lower).

Q3: What ppoDLCO value is considered high risk?
A: ppoDLCO <40% predicts increased risk; <30% predicts very high risk of postoperative complications.

Q4: Are there other factors that affect postoperative risk?
A: Yes, including ppoFEV1, exercise capacity, comorbidities, and surgical approach.

Q5: Should this be the sole determinant for surgical candidacy?
A: No, it should be part of a comprehensive preoperative assessment including other pulmonary function tests and clinical evaluation.