Lecture 29: Peri-Anesthesia Monitoring and Complications- III Flashcards
What is the goal of maintaining BP under anesthesia
Maintains good oxygen delivery (DO2) throughout peri-anesthesia period
What MAP do you want to maintain in small animals
60mmHg
What MAP do you want to maintain in large animals
70mmHg
What are the pros and cons of non-invasive BP
Pros
- easy to use, non invasive
Cons
- lower accuracy, non-continuous, Doppler only measures systolic
What are the pros and cons of invasive BP
Pros
- reliable (gold standard)
- continuous
Cons
- invasive, Complications (hemorrhage, infection, phlebitis, pain, thrombosis), skills required
What is the mechanism of oscillometer
High pressure to occlude arterial blood and then gradually deflate cough and measure systolic, mean and diastolic based on sounds heard
What is the most and least accurate measurements from oscillometer
Most: MAP
Least: diastolic
How do you measure/ choose appropriate cuff size
Width of the cuff should be 30-40% of the circumference
If the cuff is too big you will get a __reading
Falsely low
If the cuff is too small you will get a ___reading
Falsely high
The cuff should be placed at the same level as ___
Base of the heart
If you place the cuff lower than the base of the heart you will get __values
High
If you place cuff higher than base of the heart you will get ___values
Lower
The cuff should not be placed on a __
Joint
Where should cuff be placed on pig
Metatarsal
What should be lined up with line on cuff
artery
What can you compare BP from cuff to, to assess accuracy
HR measured from cuff should be close to ECG lead HR
Which screen shows an accurate vs inaccurate BP reading and how do you know
Left: inaccurate because pulse from cuff is 55 whereas ECG is 174
Right: accurate pulse from cuff is 117 and ECG is 120
Dopplers only measure __pressure
Systolic
In what species is the Doppler systolic pressure close to MAP
Cats
Why is Doppler advantageous
Continuous monitoring of its sounder- quicker realization of sudden change in circulation status
T or F: invasive BP should be used even for routine elective procedures in clinically healthy patients
False
What species is an invasive BP routine when under GA
Horses
Where do you do arterial catheter/ invasive BP for dogs and cats
Dorsal pedal artery
Where do you do arterial catheter/ invasive BP for pigs
Auricular artery
Where do you do arterial catheter/ invasive BP for horses
Facial artery, transverse facial artery, metatarsal artery
Where do you do arterial catheter/ invasive BP for ruminants
Articular artery