hello dear,
The effectiveness of suctioning is usually measured by ,
1.ABG analysis.
2.Auscultation.
3.Work of breathing changes.
4.Sputum volume.
but since the hypothetical scenario is a smoke inhalation so we r dealing with carbon monoxide thus considering Standard ABG analysis is out of question as it will show high oxygen saturation which is misleading.The remaining criteria still holds good and can be used,and i particularly feel that the auscultation should be the first choice as work of breathing and sputum volume can be influenced by other things.
regards