[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Anaesthesia and ICU](https://durgical.com/en/anaesthesia/) › [Preoperative assessment](https://durgical.com/en/anaesthesia/areas/preop/) › Consent for anaesthesia # Consent for anaesthesia - Concept Before anaesthesia, the patient hears what will be done, its main risks and options, and freely agrees, in words they understand. Updated Nov 13, 2026 ## Key points - Valid consent needs capacity, adequate information and voluntariness; a signed form alone does not prove it. - Disclose the risks a reasonable patient would consider significant, including rare but serious ones, not only the frequent ones. - Obtain consent before sedative premedication; a sedated patient may not be able to decide. - In a life-threatening emergency with no capacity and no surrogate, necessary treatment may proceed; document why. - A capable adult may refuse any treatment, including blood, even if the refusal leads to harm. ## What it is Consent for anaesthesia is a conversation, not a signature. It rests on three conditions: the patient has decision-making capacity, has received enough information to decide, and decides freely without pressure. The information covers what will be done (general, regional or sedation), why, the expected benefits, the risks that a reasonable patient would want to know (common and minor, and rare but serious), the realistic alternatives including doing nothing, and what happens after. Anaesthesia often has its own discussion apart from the surgical consent, because the anaesthetist chooses the technique and knows its risks. Specific points include blood transfusion, regional block specific risks, awareness, dental damage, and whether a trainee will take part. Consent is obtained before any sedating premedication, in a language the patient understands, with an interpreter when needed. Children and adults without capacity follow legal rules for substitute decision makers, and in an emergency treatment needed to save life may proceed without consent. The discussion and the patient's questions are documented. ## Key points - Capacity is decision-specific: the patient understands, retains, weighs and communicates a choice. - Common, minor effects: sore throat, nausea and vomiting, shivering, drowsiness, bruising at the cannula. - Uncommon or rare serious risks: dental damage, awareness, nerve injury, severe allergy, aspiration, brain injury and death. - Regional anaesthesia adds its own: failed block, post-dural puncture headache, hypotension, nerve damage, and rarely haematoma or infection. - Minors: parents or legal guardians consent, and the child's or adolescent's assent is sought according to maturity. ## Components - The nature of the procedure: technique, lines, airway devices and where the patient wakes. - Benefits and the reason for the chosen technique. - Material risks: frequent minor effects and rare serious complications. - Alternatives: other techniques, delaying, or not proceeding. - Opportunity for questions, time to decide and the right to withdraw consent at any time. ## In practice - Use plain words and check understanding with teach-back rather than asking «Do you understand?». - Offer an interpreter for patients who do not speak the language well; family members are a last resort. - Jehovah's Witness patients: discuss which blood products and techniques they accept, and record their choices in advance. - If the planned technique may change (block converted to general anaesthesia), include that possibility in the conversation. - Note who was present, what was discussed, any specific concerns and the patient's decision. ## Next step - Document the conversation in the record: technique, risks discussed, alternatives, questions and the decision. - Call a senior if capacity is doubtful, the patient refuses an essential part of the plan, or relatives disagree. - Use the hospital's legal pathway for minors and adults without capacity; involve ethics or legal services when needed. - Recheck consent on the day if the plan, surgeon or technique has changed since the visit. - After surgery, tell the patient about any complication that occurred, openly and promptly. ## Test yourself Think of the answer, then tap the question to see it. ## What three conditions make consent for anaesthesia valid? The patient has decision-making capacity, has been given adequate information about the procedure, risks and alternatives, and decides voluntarily. ## Why should consent be obtained before sedative premedication? Sedatives can impair understanding and judgment, so the patient may no longer have the capacity to give valid consent. ## Which risks should be disclosed in the anaesthesia consent discussion? Those a reasonable patient would want to know: common minor effects such as sore throat or nausea, and rare but serious ones such as awareness, nerve injury or death. ## When may anaesthesia proceed without consent? In an emergency where treatment is needed to save life or prevent serious harm, the patient lacks capacity and no surrogate is available; the reason is documented. [Add to my cards (4)](https://durgical.app/estudiar/?add=/en/anaesthesia/consent-for-anaesthesia/) ## Elsewhere in DurgiPedia - [Informed consent: elements and how to obtain it](https://durgical.com/en/medical-ethics/informed-consent-elements-and-how-to-obtain-it/) - [Decision-making capacity (competence) and how to assess it](https://durgical.com/en/medical-ethics/decision-making-capacity-and-how-to-assess-it/) - [Consent in minors: progressive autonomy in Colombian law](https://durgical.com/en/medical-ethics/consent-in-minors-progressive-autonomy-in-colombian-law/) - [Consent in emergencies and the exceptions to consent](https://durgical.com/en/medical-ethics/consent-in-emergencies-and-the-exceptions-to-consent/) - [The informed-consent station](https://durgical.com/en/clinical-skills/the-informed-consent-station/) ## Connections ## Related 6 - [The pre-anaesthetic visit: history, examination and tests](https://durgical.com/en/anaesthesia/the-pre-anaesthetic-visit-history-examination-and-tests/) - [General, regional, local and sedation: what each one is](https://durgical.com/en/anaesthesia/general-regional-local-and-sedation-what-each-one-is/) - [Premedication and aspiration prophylaxis](https://durgical.com/en/anaesthesia/premedication-and-aspiration-prophylaxis/) - [Awareness and depth of anaesthesia](https://durgical.com/en/anaesthesia/awareness-and-depth-of-anaesthesia/) - [Paediatric anaesthesia](https://durgical.com/en/anaesthesia/paediatric-anaesthesia/) - [Obstetric anaesthesia and caesarean section](https://durgical.com/en/anaesthesia/obstetric-anaesthesia-and-caesarean-section/) [← All of anaesthesia](https://durgical.com/en/anaesthesia/) Educational content; it does not replace supervised training, your institution's protocols or the anaesthetist's or intensivist's decision. It contains no doses and no ventilator or infusion settings. Sources: [Informed Consent](https://www.ncbi.nlm.nih.gov/books/NBK430827/) (StatPearls (NCBI Bookshelf), 2024). ## **Spotted a mistake?** We are always improving for the community. Tell us what is wrong and our team will review it. Report a mistake Representative model, for educational purposes only. --- Source: https://durgical.com/en/anaesthesia/consent-for-anaesthesia/ License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/anaesthesia/consent-for-anaesthesia/