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Flashcards in General Anesthesia, MAC Deck (24)
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1

What do the letters in MAC stand for, and what is the definition of MAC?

the minimum alveolar concentration of inhaled anesthetics at 1 atm that produces immobility in response to a noxious stimulus in 50% of subjects

2

What is the dose for MAC awake and what does it mean?

0.5 MAC

the end-tidal anesthetic concentration at 1 atm that suppresses the appropriate response to command in 50% of subjects

3

What is the dose for MAC amnesia?

0.25 MAC

4

What is the dose of MAC EI?

1.3 MAC

(produces loss of motor function, sensory recall, sympathetic response to stimulation)

5

What is the dose of MAC BAR?

1.5 MAC

(adrenergic and CV responses blocked at this dose)

6

Stage III of anesthesia has how many planes?

4

7

Describe the first plane of stage III.

- considered "light" for surgical anesthesia

- blink and swallow reflexes intact

- regular respiration with good chest motion

8

Describe the second plane of stage III.

- loss of blink reflex

- pupils become fixed in one position (usually central)

- respirations still regular with good use of accessary muscles

9

Describe the third plane of stage III.

- start to lose the use of accessary muscles for respiration

- breathing becomes shallow

- may require assisted ventilation

10

Describe the fourth plane of stage III.

- no use of accessary muscles for breathing

- all respiratory effort produced by the diaphragm

11

What is the MAC of halothane, isoflurane, desflurane, sevoflurane, and nitrous oxide? (approximately)

halothane - 0.75
isoflurane - 1.2
desflurane - 6
sevoflurane - 2
nitrous oxide - 105

12

Define diffusion hypoxia.

Diffusion hypoxia refers to the rapid diffusion of nitrous oxide into alveoli at the end of a nitrous oxide anesthetic. Nitrous oxide dilutes the alveolar gas and produces a transient decrease in Pao2 and Paco2. (Miller's Anesthesia)

13

During flight school, pilots are told that their job will be likened to that of what other profession?

nurse anesthesia

14

The stage of analgesia or induction is considered what Stage of Anesthesia?

Stage I

15

The stage of excitement is considered what Stage of Anesthesia?

Stage II

16

The surgical or operative stage is considered what Stage of Anesthesia?

Stage III

17

The "danger stage" is considered what Stage of Anesthesia?

Stage IV

18

When preparing for a case, acronyms like MSMAID, SOAP, and DAMMITTS are used as reminders.... pick one and decipher its meaning!

MSMAID - machine check, suction, monitors, airway, IV setup, drugs

SOAP - suction, oxygen, airway, pharmacology

DAMMITTS - drugs, airway, machine check, monitors, IV setup, twitch monitor, table, and stethoscope

19

What are the 5 goals of the perioperative period?

- amnesia
- analgesia
- immobility
- unconsciousness
- attenuation of autonomic reflexes

20

What is the ASA classification of a healthy patient?

ASA I

21

What is the ASA classification of a patient with mild systemic disease without functional limitations?

ASA II

22

What is the ASA classification of a patient with severe systemic disease with definite functional limitations?

ASA III

23

What is the ASA classification of a patient with severe systemic disease that is life threatening?

ASA IV

24

What is the ASA classification of a dying patient not expected to survive for 24 hours without an operation?

ASA V