I would think that vagal maneuvers/adenosine and good infection control program respectively would be much more appropriate. I don't see why there is a need to try to apply OMM to everything when standard approachs work just as well.
Perhaps you are confused over the usage of OMM as an "adjunctive" modality.
No one (at least to my knowledge) is promoting OMT as the sole or lone therapy in a disease state, but rather as an additional means of benefitting the patient.
Vagal maneuvers are indeed helpful tools and there are a couple (I can think of 2 right away) osteopathic techniques that are just as effective and can be incorporated into your quick set of vagal maneuvers. Much safer than compressing the orbit or a rectal probe.
Infection control for any infection is less than stellar in most hospitals. Many physicians will agree that despite best efforts (and research does back this up) hospital acquired infection is still a great concern.
So when given an opportunity to benefit a critically ill patient in the unit with OMT (which has been shown in research to increase circulating WBCs, increase pulmonary blood flow, increase pulmonary expansion, increase ABX levels in the blood) then I am certainly going to take a few minutes of my day and offer that therapy.
As far as adenosine goes, its a great drug. I dont know any doc who gets excited to push it and I am sure if a few vagal maneuvers and quick OMT can break a rythm then they would be much happier than having to use such a malignant drug.
And just as a side note regarding "when standard approachs work just as well". We are losing the battle against hospital acquired infection. I dont know any physician who thinks that current methods of infection control in the hospital, particularly in the unit, are successfull. If they were there would be no need to pay one nurse good money to keep track of infections...there wouldnt be enough work to go around, but this is clearly not the case.