Veterinary Anesthesia & Analgesia Support Group
Practical Information for the Compassionate Veterinary Practitioner
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  Monitoring Basics
  Angela Dyer-Corso
  May, 2004


I.  General Principles

A.     It is better to be too light then too deep/dead.

B.     When monitoring, don’t get into the habit of just doing the vitals and writing the numbers every 5 minutes.  Be constantly aware of what is going on.  Things can go wrong.  The faster we react, the better to prevent serious/fatal problems.

C.     Overall trends are more important than individual readings.  That is even though the heart rate may still be in the normal range, if it has been steadily falling for 15 minutes; the patient is on too much anesthesia.

D.     If the animal is too deep the first thing to do is turn off the iso.

E.      “Sighing” the patient every 5 to 10 minutes can assist ventilation.  You do this by closing the pop-off/plugging the bag and giving the patient a deep (up to but not over 20 cm H2O) breath.

F.      At the end of the procedure, turn off the iso., leave the pop-off valve open and squeeze the bag until it is empty.  Leave the patient on oxygen until it wakes up.  The patient can be extubated when it swallows twice or sits up and looks at you.  Brachycephalic dogs (squished faces) need to have their tubes left in for as long as possible.

G.     Premedication and pain control lower the doses needed for induction and maintenance of anesthesia.  Always give all induction agents to effect even if the calculated dose calls for more.

H.     Know what drugs may be needed in an emergency and where they are kept

                                                   i.      Atropine

                                                 ii.      Epinephrine

                                                iii.      Dexamethasone Sodium Phosphate and Soludelta cortef

                                               iv.      Lidocaine

                                                 v.      Diphenhydramine (Benedryl)

                                               vi.      Lasix and Mannitol

                                              vii.      Antisedin (Atipamazole)

                                            viii.      Naloxone

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