Good findings. The most relevant sources are Murray & Nadel's (dedicated section) and Miller's Anesthesia (for preoperative assessment). Let me read both simultaneously.

Now let me get the Miller's Anesthesia section on 6MWT in preoperative assessment (which is most relevant for DNB anaesthesia) and also the Washington Manual content:

Let me get the Miller's Anesthesia section on preoperative functional assessment that includes 6MWT (block 11 around line 1933) and the main respiratory assessment section:

Now let me get the Miller's pre-thoracotomy box (Box 49.1) and also look for ATS/ERS protocol details and the preoperative flowchart context:

Fishman's has a dedicated technical aspects section. Let me read that and fetch the Miller's flowchart image:

Excellent — I have the flowchart and Fishman's technical section. Let me read the rest of Fishman's 6MWT section:

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