Welcome to your 💉 Regional, Neuraxial & General Anaesthesia Arena — 40 Integrated MCQs
1.
A patient receives midazolam before a procedure and subsequently remembers very little about events occurring after drug administration. Painful stimulation, however, still requires an additional drug. Which property of midazolam best explains this pattern?
2.
A patient with an undiagnosed pneumothorax receives an inhalational analgesic during a procedure. Shortly afterward, the trapped intrapleural gas expands and respiratory distress worsens. Which anaesthetic is most likely responsible?
3.
A patient develops a hypermetabolic crisis during general anaesthesia. The triggering anaesthetic is stopped and supportive treatment is started. Which action of the specific antidote most directly treats the underlying abnormality?
4.
A 58-year-old man undergoing prolonged surgery is receiving a volatile anaesthetic. The anaesthetist wants to alter the depth of anaesthesia rapidly because blood pressure is fluctuating. Which pharmacokinetic property would best permit rapid adjustment of brain anaesthetic concentration?
5.
A woman undergoes a procedure under epidural anaesthesia. Compared with a spinal technique, onset is slower because the injected drug must first diffuse toward the nerve roots from which location?
6.
After excessive exposure to a topical local anaesthetic, a patient develops impaired oxygen carriage due to oxidation of haemoglobin despite an apparently adequate airway. Which drug is particularly associated with this complication?
7.
A patient develops severe hypotension and a dangerous cardiac arrhythmia after accidental intravascular administration of a long-acting local anaesthetic. Which drug is particularly associated with serious cardiotoxicity?
8.
A 70-year-old man is being assessed before elective surgery. He has limited neck movement, exertional breathlessness and takes several cardiovascular medicines. Why are these findings particularly important to the anaesthetist?
9.
A patient receives an intravenous induction drug and becomes unconscious within seconds. Several minutes later, consciousness begins to return even though little drug has yet been eliminated from the body. Which pharmacokinetic process best explains this pattern?
10.
A local anaesthetic is injected around a nerve that is firing rapidly because of repeated painful stimulation. The block becomes more effective with repeated channel activation. Which property best explains this finding?
11.
A patient is kept unconscious during surgery with a continuous intravenous hypnotic together with an opioid. No volatile anaesthetic is used for maintenance. Which feature is essential to this anaesthetic technique?
12.
During general anaesthesia, a patient's oxygen saturation remains satisfactory, but exhaled carbon dioxide suddenly disappears from the monitor. Which monitor has provided the most immediate clue to a ventilation or airway problem?
13.
A patient develops systemic effects after accidental intravascular injection of a local anaesthetic. Neurological and cardiac manifestations occur because the drug is no longer acting only on peripheral sensory nerves. Which shared cellular target explains toxicity in these other excitable tissues?
14.
A topical local anaesthetic preparation is applied to intact skin before a superficial needle procedure. The patient is told that useful anaesthesia will not be immediate. Which feature of this route best explains the delay?
15.
A trauma patient requires anaesthesia for a painful procedure. Blood pressure is borderline low and spontaneous breathing is desirable. The selected agent provides profound analgesia and tends to increase heart rate and blood pressure. Which drug is most appropriate?
16.
A patient undergoing anaesthesia with a volatile agent develops tachycardia, generalized muscle rigidity, rapidly increasing end-tidal carbon dioxide and metabolic acidosis. Which cellular disturbance is central to this complication?
17.
After receiving ketamine, a patient has good analgesia and amnesia but later describes vivid dreams and frightening perceptual experiences during recovery. Which pharmacological action is responsible for the anaesthetic state produced by this drug?
18.
A woman in labour requests effective pain relief but wishes to remain awake and avoid marked systemic sedation. The obstetric team also wants to minimize neonatal exposure to systemic opioid effects. Which pharmacological approach best meets these aims?
19.
A critically ill patient has severe systemic disease that represents a continuous threat to life but is not described as moribund. Which ASA physical-status category is most appropriate?
20.
A surgeon uses lignocaine with adrenaline for local infiltration around a skin incision. Which change most directly accounts for the longer duration of anaesthesia?
21.
A patient undergoing a short procedure receives an intravenous agent that produces hypnosis and rapid recovery. After induction, arterial pressure falls and transient apnea occurs. Which mechanism most likely accounts for the anaesthetic action of this drug?
22.
Soon after a peripheral nerve block, a patient develops circumoral numbness, tinnitus and agitation. These symptoms are followed by a generalized seizure. Which explanation best accounts for this sequence?
23.
Two inhalational anaesthetics are compared during teaching. Agent X has a MAC of 1.2%, while Agent Y requires a much higher alveolar concentration to prevent movement in 50% of patients. Which conclusion is most appropriate?
24.
During maintenance of anaesthesia, a volatile agent produces hypotension mainly by reducing systemic vascular resistance. The same drug is relatively pungent and is therefore less suitable for smooth inhalational induction. Which agent is most likely being used?
25.
A dental local anaesthetic solution contains adrenaline 1:80,000. What concentration of adrenaline does this represent?
26.
Before anaesthesia, a patient at increased risk of aspiration is given medication intended to reduce the hazard from gastric contents. Which pre-anaesthetic strategy most directly addresses this objective?
27.
A 62-year-old man is scheduled for a prolonged lower-limb procedure. The anaesthetist wants a rapid, dense initial neuraxial block but also wants the option of extending anaesthesia if surgery continues longer than expected. Which technique best meets both requirements?
28.
A patient with a high cardiac output is being induced with a relatively blood-soluble volatile anaesthetic. Compared with a patient having a lower cardiac output, induction is slower. Which mechanism best explains this finding?
29.
A 45-year-old patient requires an inhalational agent that permits very rapid emergence after a short surgical procedure. The anaesthetist accepts that airway irritation may occur. Which agent best fits this requirement?
30.
A patient receives a peripheral nerve catheter after limb surgery because prolonged postoperative regional analgesia is anticipated. What is the main advantage of this approach over a single-shot block?
31.
During induction, a potent opioid is administered rapidly in a relatively large amount. The patient develops marked difficulty with manual ventilation despite adequate unconsciousness. Which adverse effect should be suspected?
32.
A patient with significant hepatic dysfunction receives an amide local anaesthetic. Which pharmacokinetic change is most relevant when considering systemic accumulation?
33.
During neuraxial anaesthesia, a patient first develops loss of sympathetic tone and pain sensation while substantial motor power is initially preserved. Which principle best explains this pattern?
34.
A patient with severe systemic disease is undergoing urgent surgery because delaying the procedure would significantly increase the threat to life. Which ASA designation best communicates both physical status and urgency?
35.
A child undergoing surgery below the umbilicus receives an epidural-type regional block through an approach at the lower end of the sacrum. Which technique has most likely been used?
36.
A 67-year-old patient with significant cardiovascular disease requires intravenous induction. The anaesthetist wishes to minimize hypotension, but prolonged administration is avoided because of an important endocrine adverse effect. Which agent best fits this profile?
37.
A patient scheduled for lower abdominal surgery has a significant coagulation disorder. The operation could technically be performed under either general or neuraxial anaesthesia. Which factor most strongly argues against choosing a neuraxial technique?
38.
A patient is induced with an inhalational anaesthetic that is moderately soluble in blood. Ventilation is deliberately increased during induction. What effect is most likely?
39.
A sedative and an opioid are combined for a painful procedure. The patient becomes excessively drowsy and ventilation slows. Which principle best explains why this combination requires careful monitoring?
40.
A patient undergoing major vascular surgery requires continuous blood-pressure measurement and repeated arterial blood-gas sampling. Which monitoring method provides both functions?
