Page 6 of 15
AS3.2-3 | Pre-anaesthetic History, Medication Review and Clinical Examination Documentation — SDL Guide (Part 3)
Self-Assessment: Confirming Assessment Completeness
Before signing off a pre-anaesthetic assessment, every practitioner — regardless of experience level — should run a structured self-check to confirm that no critical element has been missed. This disciplined final review is not a reflection of distrust or incompetence; it is a recognition that cognitive shortcuts, time pressure, and interruptions during a busy preoperative clinic or ward round can cause even experienced clinicians to omit important questions or documentation steps. The consequence of an incomplete pre-anaesthetic assessment is not merely an administrative gap — it can be a patient safety event. An unasked family history of malignant hyperthermia, an undocumented difficult airway, or an ambiguous medication instruction can each, independently, contribute to a serious intraoperative complication. The self-assessment habit is also the foundation of the reflective practice that is central to competency-based medical education: knowing what you know, knowing what you do not know, and seeking guidance before the patient is anaesthetised rather than after. Use the following checklist after every pre-anaesthetic assessment until the domains become second nature.
The self-assessment checklist for a completed pre-anaesthetic assessment:
- Anaesthetic history asked and documented (previous anaesthetics, any problems, family history of anaesthetic reactions)
- Allergy history documented with reaction and severity
- Airway assessment documented with Mallampati class, inter-incisor distance, thyromental distance, and neck mobility
- Cardiovascular examination documented including bilateral blood pressure, pulse rhythm, and auscultation findings
- Respiratory examination documented including SpO2 on air
- Complete drug list obtained, classified, and perioperative instructions written for each drug
- Fasting instruction given and understood by the patient
- Relevant investigations reviewed and acted upon
- ASA class assigned with reason
- Anaesthetic technique proposed with rationale
- Patient counselled regarding technique, specific risks, and recovery expectations
- Note signed, dated, and timed
If any item is incomplete, it must be addressed before the patient enters the operating room. A pre-anaesthetic assessment is not a bureaucratic formality — it is the safety architecture that protects the patient during the most pharmacologically and physiologically disruptive intervention in medicine.
SELF-CHECK
A patient scheduled for elective laparoscopic hernia repair mentions during the pre-anaesthetic assessment that his last anaesthetic 'went fine but his father almost died after the same operation years ago — they said it was something to do with the gas.' What is the most important action to take based on this history?
A. A. Reassure the patient that modern anaesthesia is safe and proceed with standard volatile agent technique
B. B. Investigate for malignant hyperthermia susceptibility and plan a total intravenous anaesthesia (TIVA) technique avoiding volatile agents and suxamethonium
C. C. Cancel the operation until the father's medical records are obtained
D. D. Switch from laparoscopic to open technique to reduce anaesthetic exposure time
Reveal Answer
Answer: B. B. Investigate for malignant hyperthermia susceptibility and plan a total intravenous anaesthesia (TIVA) technique avoiding volatile agents and suxamethonium
The history strongly suggests a family history of malignant hyperthermia (MH). MH is an autosomal dominant pharmacogenetic disorder of skeletal muscle calcium regulation (RYR1 gene mutations in most cases) triggered by volatile anaesthetic agents and suxamethonium. 'Almost died after an operation' combined with 'something to do with the gas' is a classic MH trigger description. The appropriate response is to treat this patient as MH-susceptible until proven otherwise: plan total intravenous anaesthesia (TIVA) with propofol, avoid all volatile agents (halothane, isoflurane, sevoflurane, desflurane) and suxamethonium, ensure dantrolene is immediately available, and refer for formal MH susceptibility testing (caffeine-halothane contracture test, or genetic testing for RYR1 mutations). Cancelling the operation is not necessary if TIVA is available. Switching to open surgery does not address the anaesthetic risk.
CLINICAL PEARL
The family history of anaesthetic problems is one of the most under-asked questions in the pre-anaesthetic assessment — and one of the most important. Malignant hyperthermia (MH) is autosomal dominant: if a parent had an MH crisis, each child has a 50% chance of being susceptible. Many patients are told after a crisis that 'the gas caused a reaction' or 'their muscles overheated' — they remember the explanation imperfectly but they remember that something was wrong. Any history of unexpected death, severe fever, or muscle rigidity during or after anaesthesia in a first-degree relative should trigger an MH-safe anaesthetic plan: total intravenous anaesthesia (TIVA) with propofol, no volatile agents, no suxamethonium, and dantrolene immediately available. Never dismiss a vague family history of anaesthetic problems as 'old anaesthetics were just different' — the trigger drugs are still in use today.