Anesthesia MCQ_Part 01

1.Which of the following is a contraindication for using a laryngeal mask airway ?
a) when inhalational anaesthesia is required
b) large obstructive lesion in the oropharynx
c) Maintaining airway during difficult intubation
d) Emergency management of airway in failed intubation
e) bronchoscopy in the awake patient

2.In a lower Segment Caesarean Section which of the following techniques of anesthesia is least desirable ?
a) Spinal anesthesia
b) Caudal anesthesia
c) Combined Spinal Epidural anesthesia
d) epidural anesthesia
e) General anesthesia

3.Which of the following is likely to DECREASE the minimum alveolar concentration of an anesthetic ?
a) Hyperthermia
b) Hypernatraemia
c) Benzodiazepines
d) Hypercapnia
e) Thyrotoxicosis



The Correct Answer is B
The Laryngeal Mask Airway is an alternative airway device used for anesthesia and airway support. It consists of an inflatable silicone mask and rubber connecting tube. It is inserted blindly into the pharynx, forming a low-pressure seal around the laryngeal inlet and permitting gentle positive pressure ventilation.
The Laryngeal Mask Airway is an appropriate airway choice when mask ventilation can be used but endotracheal intubation is not necessary.

  • Non-fasted patients
  • Morbidly obese patients
  • Obstructive or abnormal lesions of the oropharynx

It may be used as a rescue airway and fiberoptic conduit when intubation is difficult, hazardous or unsuccessful. And it can be used for bronchoscopy in the awake or asleep patient.


The Correct Answer is B
Caudal anaesthesia is unpopular because of the risk of introducing needle passing through the mother's sacrum and rectum and into fetal presenting parts.


The Correct Answer is C
The minimum alveolar concentration (MAC) is the concentration of anesthetic at 1 atmosphere of pressure that produces immobility in 50% of patients exposed to a noxious stimulus.It is inversely related to potency.

Factors Which Affect MAC

Increase MAC
  • Hyperthermia
  • Hypernatraemia
  • Sympathoadrenal stimulation
  • Chronic alcohol abuse
  • Increases in ambient pressure
  • Hypercapnia
  • Decreasing age
  • Thyrotoxicosis

Decrease MAC
  • Nitrous oxide
  • Hypothyroid/myxoedema
  • Hypocapnia
  • Hypothermia-decrease is roughly linear
  • Hyponatraemia
  • Increasing age
  • Hypoxaemia
  • Hypotension
  • Anaemia
  • Pregnancy
  • CNS depressant drugs - opioids,
  • benzodiazepines, major tranquilizers, TCA's
  • Other drugs - lithium, lidocaine, magnesium, methyl dopa, clonidine
  • Acute alcohol abuse



2 comments to "Anesthesia MCQ_Part 01"

azadeh said...
August 11, 2010 at 10:26 PM

It would be ok if you printed the answers.

mohamed said...
January 16, 2012 at 2:53 PM


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