Response to Anesthetic Problems and Emergencies We are going to talk about your response to:  Depth of anesthesia issues  Cardiac arrest  Recovery period problems

ANIMALS THAT WILL NOT STAY ANESTHETIZED  Double-check equipment Vaporizer Oxygen ET tube  Too small in diameter?  Double-check the patient Respirations  Rapid and shallow can lead to not enough anesthetic gas exchange  Check capnograph

ANIMALS THAT ARE TOO DEEPLY ANESTHETIZED  Respirations Rate: Character:  Mucous membranes:  Capillary refill time:  Heart rate:

ANIMALS THAT ARE TOO DEEPLY ANESTHETIZED  Pulse quality:  ECG:  Temperature:  Reflexes:  Muscle tone:  Pupils:

TREATING EXCESSIVE ANESTHETIC DEPTH  Lower vaporizer setting  Notify veterinarian  Manually ventilate the patient 1. Close the pop-off valve 2. Fill the reservoir bag with pure oxygen 3. Gently squeeze the bag until the patient’s chest rises slightly (not above 20 cm H2O) 4. Repeat until animal shows signs of recovery  Reversals, doxapram, fluids, warmth

CARDIAC ARREST A sudden cessation of effective ventilation and circulation.  Signs it’s coming: Cyanosis Respiratory arrest CRT > 2 sec Weak arterial pulse Very low BP readings Abnormal ECG tracing  VPCs  V-fibrillation  Asystole

CARDIAC ARREST  Signs it’s here: No heart beat auscultated No palpable pulse MM gray No PLR; no corneal reflex Respirations- only agonal Initiate CPCR: a team effort! ASK FOR HELP

CARDIAC ARREST – ABCDE???  There is a critical window to restore oxygen delivery to the brain How long do you have?  Ideally, 5 people would participate in the resuscitative efforts 1. Performs chest compressions 2. Bags the animal 3. Assess the pulse during compressions and ECG when compressions are temporarily suspended 4. Draws up and administers drugs on the veterinarian’s orders 5. Maintains a record of procedure Can be done with less!

CARDIAC ARREST – CBADE  Circulation restoration is most important  Start compressions!  Positioning Slightly different based on size

CARDIAC ARREST - CBADE  Circulation  RATE: 1-2 times per second ~80 times per minute for a large dog ~120 times for small dogs or cats  Chest should be compressed ~1/3 the diameter of the chest wall  Compressions and bagging should be administered simultaneously. If you are alone, 10 compressions per 2 breaths. **Circulation should take priority over breathing, if working alone**

CARDIAC ARREST - CBADE  Can switch to internal massage What procedure would be performed? Invasive, but can get higher return of cardiac output  Defibrillation may be started Electric shock (J/kg) No alcohol if defibrillating!

CARDIAC ARREST - CBADE  Continue compressions until you have return of spontaneous circulation  Palpate pulse, continue ECG, auscultate continuously  Continue bagging after beat is back

CARDIAC ARREST - CBADE  Airway and Breathing  Intubate  Ventilate every 10 seconds

CARDIAC ARREST - ABCDE  Drugs : Epinephrine Dopamine/dobutamine- increase force and rate of CO Atropine Lidocaine  Routes: IV- drugs, fluids IT – drugs IC – last resort  Which ventricle?

CARDIAC ARREST - ABCDE  E CG Periodically check for spontaneous contractions by discontinuing external compression Done by either palpating for a pulse or looking for QRS complexes on the ECG.

CARDIAC ARREST - ABCDE  After Care:  Common for patient to repeat arrest within 24 hours  Neurological tests needed  Must be monitored extremely close

Reading Assignment Other reasons for the clinical signs of being too deeply anesthetized: Page (Start at Pale MM, stop at Cardiac Arrest) Problems That May Arise in the Recovery Period Pages I would suggest reviewing the chapter key points and Procedures 12-1 through as well.