I hate to go against two who are higher trained than me but I'd have to argue that your initial ABC assessment to me is are they breathing and is the tidal volume adequate for oxygenation. I was never taught to listen to lung sounds during that stage as knowing if they have wheezing or a pneumo doesn't do much for me until I know if they have a pulse or not. The way we were taught we listen after covering the head and neck in the rapid trauma assessment. If I find a pneumo at that time I would put the rest of the assessment on hold while I got out the big needle but I don't agree with treating that prior to knowing if they have a pulse or not.
I'm not saying I'm 100% correct and most of my thoughts are "because that's what we were taught" so I'm open to different views and willing to listen to other lines of reasoning.
First off, we're splitting hairs on the alphabet. If you show up on scene and they're screaming in pain, they have an airway, are breathing, and have a pulse. So let's not get off topic.
You're not listening for quality of breath sounds (wheezes, rales, rhonchi... yadda). You're listening for
presence of breath sounds. As in whether they have breath sounds or they are lacking breath sounds. Not having any breath sounds is an immediate life threat. And the only way you can determine if they have them or not is in the use of a stethescope.
As I stated earlier, tracheal deviation is a
late sign. Absence of breath sounds on a possible pneumo would be one the early signs that you incorporate with the other signs to come to the field dx of pneumo: SOB, MOI, flail segment, decreased chest excursion on effected side, crepitus, subq air along with tachycardia, tachypnea, ALOC, hypoxia... you get my point. Determination of a poss pneumo is sometimes easier said than done. So, in order to accurately dx and prevent a sentinel event (causing a pneumo where you didn't have one before), you will need
all of the available information and need it quickly.
Tom's right. Assessing for presence of breath sounds really doesn't take that long in the first place.
The assessment for
quality of breath sounds is done in your secondary survey or detailed/on going assessment during your diesel bolus
to the trauma center.