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Collins Street Specialist Centre – Sedation & Anaesthesia

Collins Street Specialist Centre offers patients clear, expert guidance on sedation and anaesthesia so that every procedure goes as smoothly and safely as possible. Knowing the difference between sedation and anaesthesia, and understanding what happens at each stage, makes a real difference to how prepared and comfortable patients feel before, during, and after treatment.

What is sedation?

Sedation uses medication to help a patient relax, feel drowsy, or become temporarily unaware of their surroundings during a medical or dental procedure. It doesn't necessarily make a patient unconscious. Instead, it works on a spectrum, from mild relaxation through to a deeply sleep-like state, depending on what the procedure requires and what suits the individual patient.

Sedation is commonly used for procedures that may be uncomfortable or anxiety-inducing but don't require full unconsciousness. It lets clinicians do what they need to do while keeping the patient calm, cooperative, and as comfortable as possible.

Levels of sedation

Sedation falls into four categories:

Minimal sedation (anxiolysis): The patient is relaxed but fully awake and can respond normally to verbal instructions. Thinking and coordination may be mildly affected, but breathing and heart function remain normal.

Moderate sedation (conscious sedation): Consciousness is reduced but the patient can still respond purposefully to verbal or light physical prompts. No help is needed to keep the airway open, and breathing stays adequate on its own.

Deep sedation: The patient can't be easily roused but will respond to repeated or painful stimulation. Breathing may be inadequate, and some airway support may be needed.

General anaesthesia: The patient is completely unconscious and won't respond even to painful stimulation. Airway management, breathing support, and continuous cardiovascular monitoring are all required.

The line between deep sedation and general anaesthesia can be surprisingly fine. That's why trained specialists and proper monitoring equipment matter whenever sedation is given, regardless of how deep it's expected to go.

What is anaesthesia?

Anaesthesia is a medically induced state that prevents patients from feeling pain during surgery or other invasive procedures. It covers a range of techniques and agents, each suited to different procedures and individual patients.

There are three main types.

1. Local anaesthesia

Local anaesthesia involves injecting or applying anaesthetic agents to numb a specific, limited area of the body. The patient stays fully conscious throughout. It's commonly used for minor procedures like skin biopsies, dental work, or small excisions where only a contained area needs numbing.

2. Regional anaesthesia

Regional anaesthesia numbs a larger part of the body, such as an entire limb or the lower half, by blocking the nerves supplying that region. Common forms include:

Spinal anaesthesia: A single injection of anaesthetic into the fluid surrounding the spinal cord, providing rapid and reliable numbness to the lower body.

Epidural anaesthesia: Anaesthetic is delivered through a catheter placed in the epidural space of the spine, allowing for continuous or repeated dosing. This is widely used in childbirth and certain surgical procedures.

Peripheral nerve blocks: Targeted injections near specific nerves or nerve clusters to numb a defined area, such as an arm, leg, or shoulder.

Regional anaesthesia is often combined with sedation, so the patient stays comfortable and relaxed without needing full general anaesthesia.

3. General anaesthesia

General anaesthesia renders the patient completely unconscious and free from pain, awareness, and any memory of the procedure. It's administered via intravenous medications, inhaled gases, or both. Patients require airway and breathing support throughout, and a specialist anaesthetist monitors their vital signs continuously.

General anaesthesia is used for major surgery, lengthy operations, or any situation where the patient must remain completely still and entirely unaware.

Who administers sedation and anaesthesia?

At Collins Street Specialist Centre, sedation and anaesthesia are administered by qualified specialists with extensive postgraduate training in anaesthetic practice. Anaesthetists are medical doctors who have completed years of specialist training focused specifically on the safe administration of anaesthetic agents, patient monitoring, and managing any complications that arise.

Depending on the procedure and clinical setting, sedation may also be given by other trained medical professionals, such as proceduralists or nurses with specialised sedation training, under appropriate supervision and established protocols.

A specialist anaesthetist is particularly important for patients with complex medical histories or multiple health conditions, procedures requiring deep sedation or general anaesthesia, children, patients with known allergies or previous adverse reactions to anaesthetic agents, and lengthy or procedurally complex interventions.

If you have questions about who will be involved in your care, the team at Collins Street Specialist Centre is happy to discuss this beforehand. You can also verify the qualifications of your treating specialists through the Australian Health Practitioner Regulation Agency (AHPRA) register.

How is the right type of sedation or anaesthesia chosen?

Choosing the most appropriate technique is a careful, individualised process. At Collins Street Specialist Centre, this decision is made collaboratively between the treating specialist and, where applicable, the anaesthetist. The factors considered include:

The nature and duration of the procedure: Minor procedures may need only local anaesthesia or minimal sedation, while major surgery typically requires general anaesthesia.

The patient's medical history: Existing conditions such as cardiovascular disease, respiratory problems, obesity, or obstructive sleep apnoea can significantly affect which agents and techniques are safest.

The patient's age and weight: Dosing and technique are carefully adjusted for children and elderly patients, as well as those with significant differences in body composition.

Known allergies or previous reactions: Any history of adverse responses to anaesthetic agents must be thoroughly documented and factored in before proceeding.

Patient preference and anxiety levels: Where clinically appropriate, patient preferences about sedation versus full anaesthesia are genuinely taken into account.

Fasting status: Patients must typically fast for a set period before receiving sedation or general anaesthesia, to reduce the risk of aspiration, which is the inhalation of stomach contents into the lungs.

Preparing for sedation or anaesthesia

Good preparation is central to safe sedation and anaesthetic practice. Patients at Collins Street Specialist Centre receive detailed pre-procedure instructions tailored to their situation. The following general guidelines apply in most cases.

Fasting requirements

Patients are usually required to fast before their procedure to reduce the risk of aspiration. Typical fasting guidelines are:

  • Solid food: at least six hours before the procedure
  • Clear fluids (water, black tea or coffee without milk, clear juice without pulp): at least two hours before the procedure
  • Breast milk for infants: at least four hours
  • Formula or non-human milk: at least six hours

These guidelines can vary depending on the procedure, the planned level of sedation, and individual circumstances. Follow the specific instructions your treating team provides. If anything is unclear, ask before the day of your procedure.

Medications

Tell your treating specialist and anaesthetist about everything you're currently taking, including prescription medications, over-the-counter drugs, vitamins, supplements, and herbal remedies. Some medications should be continued as normal; others may need to be paused or adjusted beforehand. This is particularly relevant for blood thinners (anticoagulants and antiplatelets), diabetes medications including insulin, blood pressure medications, and herbal supplements, some of which can interact with anaesthetic agents in clinically significant ways.

Don't stop or adjust any medications without discussing it with your treating team first. Changes made without guidance can introduce unnecessary risk.

Medical history and assessments

You'll be asked to provide a thorough medical history, including any previous experiences with anaesthesia or sedation and, in particular, any adverse reactions. A pre-anaesthetic assessment may be conducted, which can include a physical examination and investigations such as blood tests, an ECG, or imaging, depending on your health and the planned procedure.

This assessment is a good opportunity to raise any concerns and make sure your treating team has a complete picture of your health before you proceed.

Arranging transport and support

Anyone who receives sedation or general anaesthesia needs a responsible adult to escort them home afterwards. Driving, operating machinery, making important decisions, and drinking alcohol are all off the table for at least 24 hours after sedation or anaesthesia. The effects of the medications can persist well beyond the point where a patient feels alert, and impaired judgement or coordination may not be immediately obvious.

What to expect during the procedure

The experience during sedation or anaesthesia varies depending on the level and type used. In general terms:

Before the procedure begins, an intravenous (IV) cannula is typically inserted so medications can be delivered directly into the bloodstream. Monitoring equipment, including devices to measure heart rate, blood pressure, and oxygen saturation, will be attached and checked before any agents are given.

During the procedure, patients receiving minimal or moderate sedation may remain aware of their surroundings to varying degrees, though they'll feel relaxed and comfortable. Those under deep sedation or general anaesthesia will have no awareness of what's happening.

Throughout the procedure, a trained specialist continuously monitors the patient's vital signs and level of sedation, adjusting medications as needed to maintain both safety and comfort.

Recovery after sedation or anaesthesia

Recovery time varies based on the type and duration of sedation or anaesthesia, as well as individual patient factors. At Collins Street Specialist Centre, patients are monitored in a dedicated recovery area until they're clinically assessed as safe to be discharged.

Immediate recovery

After the procedure, patients are transferred to a recovery area where nursing staff monitor vital signs, level of consciousness, pain, and any potential side effects. Common post-sedation and post-anaesthesia effects include:

Drowsiness and fatigue: Most patients feel sleepy for several hours. This is expected and normal.

Nausea and vomiting: Post-operative nausea and vomiting (PONV) is common, particularly after general anaesthesia. Medications to prevent and treat nausea are routinely used as part of standard care.

Sore throat: If a breathing tube or airway device was used, patients may have a mild sore throat that typically resolves within a day or two.

Shivering: Some patients shiver or feel cold as body temperature normalises after anaesthesia.

Confusion or disorientation: Particularly in elderly patients, a period of confusion, sometimes called emergence delirium or post-operative cognitive changes, may occur. This is usually temporary and resolves as the anaesthetic wears off.

Pain at the IV site: Mild bruising or discomfort at the cannula insertion site is common and generally resolves quickly.

Going home

Patients are discharged once they meet specific clinical criteria, which typically include being awake and oriented, having stable vital signs, being able to tolerate fluids, and having pain adequately managed. Written discharge instructions will be provided, covering what to expect in the hours and days following the procedure and when to seek medical attention.

Recovery at home

Most patients feel back to normal within 24 hours of receiving sedation, though individual recovery times vary. After general anaesthesia, some patients experience fatigue or mild cognitive effects for several days. Patients should:

  • Rest for the remainder of the day after the procedure
  • Have a responsible adult stay with them for at least the first 24 hours
  • Avoid driving, operating heavy machinery, or making significant decisions for 24 hours
  • Avoid alcohol for at least 24 hours
  • Follow any specific dietary or activity instructions from the treating team

If recovery feels unexpectedly prolonged or symptoms cause concern, contact Collins Street Specialist Centre or seek appropriate medical attention.

Risks and complications

Sedation and anaesthesia are generally very safe when administered by trained professionals with proper monitoring equipment and protocols. That said, as with any medical intervention, risks and complications exist. These vary depending on the type of sedation or anaesthesia used, the procedure being performed, and the patient's individual health.

Common side effects

  • Nausea and vomiting
  • Headache
  • Dizziness
  • Drowsiness
  • Sore throat, if an airway device was used
  • Muscle aches

Less common but serious complications

Allergic reactions: Allergic or anaphylactic reactions to anaesthetic agents can occur, though they're rare. Trained staff and emergency equipment are always available to manage such events promptly.

Aspiration: Inhaling stomach contents into the lungs is a serious but uncommon complication, which is why fasting guidelines are strictly observed.

Respiratory depression: Excessive sedation can suppress breathing. Continuous monitoring and readily available reversal agents are essential safeguards.

Cardiovascular complications: Changes in heart rate and blood pressure can occur, particularly in patients with pre-existing cardiovascular conditions. These are closely monitored throughout.

Awareness under anaesthesia: In rare cases, patients may have some degree of awareness or retain memory of events during general anaesthesia. This is uncommon with modern anaesthetic techniques and monitoring standards.

Post-operative cognitive dysfunction (POCD): Some patients, particularly elderly ones, may experience longer-term cognitive changes following general anaesthesia. This remains an active area of clinical research.

Malignant hyperthermia: A rare but life-threatening reaction to certain anaesthetic agents, involving a rapid rise in body temperature and severe muscle contractions. This is a genetic condition, and patients with a relevant family history must disclose this to their anaesthetist before any procedure.

Discuss any concerns about risks with your treating specialist or anaesthetist at Collins Street Specialist Centre before your procedure. A thorough pre-anaesthetic assessment is the most effective way to identify and address individual risk factors in advance.

Special considerations

Paediatric patients

Anaesthesia in children requires specialised training and considerable experience. Dosing, equipment, monitoring, and technique are all adapted to suit the unique physiology of paediatric patients. Parents and carers receive specific preparation instructions and are typically permitted to be present during the induction of anaesthesia, which can help keep the child calm and settled.

Elderly patients

Older patients may carry a higher risk of certain complications, including post-operative confusion and cognitive changes, as well as interactions with other medications. A careful pre-anaesthetic assessment is particularly important in this group, to identify and address risk factors before the procedure proceeds.

Patients with obstructive sleep apnoea (OSA)

Patients with obstructive sleep apnoea may be at increased risk of respiratory complications under sedation and anaesthesia, as their airways can be more prone to obstruction when muscles are relaxed. Disclose any OSA diagnosis, and whether you use a CPAP machine, to your treating team. In some cases, additional monitoring or specific precautions may be recommended.

Pregnancy

Sedation and anaesthesia during pregnancy require careful consideration of both maternal and foetal wellbeing. Where possible, elective procedures are deferred until after delivery. When anaesthesia is necessary during pregnancy, the agents used are chosen to minimise risk to the developing baby, and the decision involves appropriate specialist input.

Frequently asked questions

Will I be asleep during my procedure? That depends on the type of sedation or anaesthesia planned. With local anaesthesia, you'll be fully awake throughout. With moderate sedation, you may feel drowsy and relaxed but will remain responsive. With general anaesthesia, you'll be completely unconscious and will have no awareness or memory of the procedure.

Will I feel pain during the procedure? The goal of sedation and anaesthesia is to ensure you don't experience pain during the procedure. The type and amount of anaesthetic or sedative used will be chosen to achieve this. If you have concerns about pain management, raise them with your treating team beforehand.

How long will the effects of sedation last? This varies depending on the agents used and the individual patient. Mild sedation may wear off within one to two hours, while the effects of general anaesthesia can persist for several hours. Avoid driving and other activities requiring full cognitive function for at least 24 hours following any sedation or anaesthetic.

Can I eat or drink before my procedure? In most cases, you'll need to fast for a period before receiving sedation or anaesthesia. Your treating team at Collins Street Specialist Centre will give you specific fasting instructions for your procedure. Follow them carefully, as they exist to reduce the risk of a serious complication.

What if I've had a bad reaction to anaesthesia in the past? Tell your treating specialist and anaesthetist about any previous adverse reactions to anaesthesia or sedation, however minor they seemed at the time. A thorough assessment will be conducted, and alternative agents or techniques will be considered to reduce the risk of a recurrence.

Is it normal to feel anxious about having sedation or anaesthesia? Very common, and nothing to feel embarrassed about. The team at Collins Street Specialist Centre is experienced in supporting patients through this process and will take the time to answer your questions and address your concerns. In some cases, a mild anxiolytic medication may be offered before the procedure to help you feel more settled as you approach the start of your treatment.

Disclaimer: All facts and statements above are general information, not professional advice. Consult relevant experts for guidance specific to your situation.