Anesthesia and Pharmacology in Surgery
Expert-defined terms from the Certificate in Surgical Technology course at Greenwich School of Business and Finance. Free to read, free to share, paired with a globally recognised certification pathway.
Anesthesia and Pharmacology in Surgery Glossary #
Anesthesia and Pharmacology in Surgery Glossary
1. Anesthesia #
Anesthesia is a medical practice that involves the administration of medications… #
The main goals of anesthesia are to eliminate pain, provide muscle relaxation, and ensure patient safety during surgery.
- General Anesthesia: A state of unconsciousness induced by administering medica… #
- General Anesthesia: A state of unconsciousness induced by administering medications that affect the entire body, resulting in the inability to feel pain or awareness.
- Regional Anesthesia: Anesthetic techniques that target specific nerve pathways… #
- Regional Anesthesia: Anesthetic techniques that target specific nerve pathways to block sensation in a specific area of the body.
- Local Anesthesia: A localized numbing technique that involves injecting medica… #
- Local Anesthesia: A localized numbing technique that involves injecting medication near the surgical site to block pain signals from reaching the brain.
2. Pharmacology #
Pharmacology is the study of how drugs interact with biological systems to produ… #
In the context of surgery, pharmacology plays a crucial role in determining the appropriate medications to use for anesthesia, pain management, and other aspects of patient care.
- Pharmacokinetics: The study of how drugs are absorbed, distributed, metabolize… #
- Pharmacokinetics: The study of how drugs are absorbed, distributed, metabolized, and excreted by the body.
- Pharmacodynamics: The study of how drugs exert their effects on the body at th… #
- Pharmacodynamics: The study of how drugs exert their effects on the body at the molecular, cellular, and organ levels.
- Drug Interactions: The effects that occur when two or more drugs interact with… #
- Drug Interactions: The effects that occur when two or more drugs interact with each other, potentially altering their efficacy or safety.
3. Anesthetic Agents #
Anesthetic agents are medications used to induce anesthesia by altering the pati… #
These agents can be administered through various routes, such as inhalation, intravenous injection, or local infiltration.
- Inhalational Anesthetics: Anesthetic agents that are inhaled by the patient to… #
- Inhalational Anesthetics: Anesthetic agents that are inhaled by the patient to induce and maintain anesthesia, such as sevoflurane or isoflurane.
- Intravenous Anesthetics: Anesthetic agents administered through a vein to rapi… #
- Intravenous Anesthetics: Anesthetic agents administered through a vein to rapidly induce anesthesia, such as propofol or ketamine.
- Topical Anesthetics: Anesthetic agents applied directly to the skin or mucous… #
- Topical Anesthetics: Anesthetic agents applied directly to the skin or mucous membranes to numb the area, such as lidocaine or benzocaine.
4. Sedation #
Sedation is a state of reduced consciousness that allows patients to remain calm… #
Sedative medications are used to induce this state while maintaining the patient's ability to respond to stimuli and maintain vital functions.
- Minimal Sedation: A light level of sedation that allows patients to remain res… #
- Minimal Sedation: A light level of sedation that allows patients to remain responsive and alert while reducing anxiety and discomfort.
- Moderate Sedation: A deeper level of sedation that causes patients to be less… #
- Moderate Sedation: A deeper level of sedation that causes patients to be less responsive but still able to maintain their own airway and cardiovascular function.
- Deep Sedation: A state of sedation where patients are on the brink of unconsci… #
- Deep Sedation: A state of sedation where patients are on the brink of unconsciousness but can still be awakened with stimulation.
5. Analgesia #
Analgesia refers to the relief of pain through the administration of medications… #
These drugs act on the central nervous system to reduce the perception of pain without causing loss of consciousness.
- Opioid Analgesics: Powerful pain-relieving medications derived from the opium… #
- Opioid Analgesics: Powerful pain-relieving medications derived from the opium poppy plant, such as morphine, fentanyl, or oxycodone.
- Non-Opioid Analgesics: Pain-relieving medications that do not belong to the op… #
- Non-Opioid Analgesics: Pain-relieving medications that do not belong to the opioid class, such as acetaminophen, ibuprofen, or aspirin.
- Patient-Controlled Analgesia (PCA): A method of pain management that allows pa… #
- Patient-Controlled Analgesia (PCA): A method of pain management that allows patients to self-administer predetermined doses of pain medication through a programmable pump.
6. Neuromuscular Blockers #
Neuromuscular blockers are medications that inhibit the transmission of nerve im… #
These drugs are used during surgery to facilitate intubation, improve surgical conditions, and prevent muscle movement.
- Depolarizing Neuromuscular Blockers: Drugs that mimic the action of acetylchol… #
- Depolarizing Neuromuscular Blockers: Drugs that mimic the action of acetylcholine at the neuromuscular junction, causing muscle depolarization and paralysis, such as succinylcholine.
- Non-Depolarizing Neuromuscular Blockers: Drugs that block the action of acetyl… #
- Non-Depolarizing Neuromuscular Blockers: Drugs that block the action of acetylcholine at the neuromuscular junction, preventing muscle contraction and inducing paralysis, such as rocuronium or vecuronium.
- Reversal Agents: Medications used to antagonize the effects of neuromuscular b… #
- Reversal Agents: Medications used to antagonize the effects of neuromuscular blockers and restore muscle function after surgery, such as neostigmine or sugammadex.
7. Local Anesthetics #
Local anesthetics are medications that block nerve conduction in a specific area… #
These drugs are commonly used for minor surgical procedures, dental work, and pain management.
- Esters: A class of local anesthetics that are metabolized by plasma esterases,… #
- Esters: A class of local anesthetics that are metabolized by plasma esterases, such as procaine or tetracaine.
- Amides: A class of local anesthetics that are metabolized by the liver, such a… #
- Amides: A class of local anesthetics that are metabolized by the liver, such as lidocaine or bupivacaine.
- Topical Anesthetic Creams: Formulations containing local anesthetics that are… #
- Topical Anesthetic Creams: Formulations containing local anesthetics that are applied to the skin to numb the area before injections or minor procedures.
8. Adjuvant Medications #
Adjuvant medications are drugs that are used in combination with anesthetics or… #
These medications may include antiemetics, anticholinergics, or corticosteroids.
- Antiemetics: Medications that prevent or alleviate nausea and vomiting, common… #
- Antiemetics: Medications that prevent or alleviate nausea and vomiting, commonly used to combat the side effects of anesthesia or opioid analgesics.
- Anticholinergics: Drugs that block the action of acetylcholine in the central… #
- Anticholinergics: Drugs that block the action of acetylcholine in the central and peripheral nervous systems, used to reduce secretions and prevent bradycardia during surgery.
- Corticosteroids: Anti-inflammatory medications that may be administered before… #
- Corticosteroids: Anti-inflammatory medications that may be administered before surgery to reduce swelling, pain, and immune responses.
9. Anesthesia Monitoring #
Anesthesia monitoring involves the continuous assessment of a patient's vital si… #
This process ensures patient safety, early detection of complications, and appropriate adjustments to the anesthesia regimen.
- Pulse Oximetry: A non-invasive method of measuring oxygen saturation in the bl… #
- Pulse Oximetry: A non-invasive method of measuring oxygen saturation in the blood using a probe attached to a patient's finger, toe, or earlobe.
- End-Tidal Carbon Dioxide (ETCO2): The partial pressure of carbon dioxide at th… #
- End-Tidal Carbon Dioxide (ETCO2): The partial pressure of carbon dioxide at the end of expiration, measured by capnography to monitor respiratory function and ventilation.
- Bispectral Index (BIS): A numerical scale that measures the depth of anesthesi… #
- Bispectral Index (BIS): A numerical scale that measures the depth of anesthesia based on the patient's brain activity, providing real-time feedback to anesthesia providers.
10. Anesthesia Complications #
Anesthesia complications are adverse events that may occur during or after the a… #
These complications can range from mild side effects to life-threatening emergencies, requiring prompt intervention and management.
- Anaphylaxis: A severe allergic reaction to medications used during anesthesia,… #
- Anaphylaxis: A severe allergic reaction to medications used during anesthesia, leading to systemic symptoms such as hypotension, bronchospasm, and cardiovascular collapse.
- Malignant Hyperthermia: A rare but life-threatening reaction to certain anesth… #
- Malignant Hyperthermia: A rare but life-threatening reaction to certain anesthetic agents, characterized by uncontrolled muscle contractions, hyperthermia, and metabolic acidosis.
- Postoperative Nausea and Vomiting (PONV): Common side effects of anesthesia ch… #
- Postoperative Nausea and Vomiting (PONV): Common side effects of anesthesia characterized by nausea, vomiting, and discomfort in the immediate postoperative period, requiring antiemetic treatment.
11. Pain Management Strategies #
Pain management strategies involve the use of pharmacological and non #
pharmacological interventions to alleviate pain before, during, and after surgery. These strategies aim to improve patient comfort, facilitate recovery, and prevent chronic pain complications.
- Multimodal Analgesia: A comprehensive approach to pain management that combine… #
- Multimodal Analgesia: A comprehensive approach to pain management that combines different classes of analgesic medications to target multiple pain pathways and reduce opioid consumption.
- Regional Anesthesia Techniques: Nerve blocks or epidural injections that provi… #
- Regional Anesthesia Techniques: Nerve blocks or epidural injections that provide targeted pain relief to specific regions of the body, reducing the need for systemic opioids.
- Patient Education: Providing information to patients about pain expectations,… #
- Patient Education: Providing information to patients about pain expectations, pain management options, and self-care techniques to empower them in managing their pain effectively.
12. Pharmacokinetic Considerations #
Pharmacokinetic considerations involve understanding how drugs are absorbed, dis… #
Factors such as patient age, weight, organ function, and drug interactions influence pharmacokinetics.
- Half-Life: The time it takes for half of the drug concentration in the body to… #
- Half-Life: The time it takes for half of the drug concentration in the body to be eliminated, influencing dosing intervals and drug accumulation.
- Volume of Distribution: The theoretical volume in which a drug would need to b… #
- Volume of Distribution: The theoretical volume in which a drug would need to be uniformly distributed to account for its plasma concentration, affecting drug distribution and dosing.
- Clearance: The rate at which a drug is removed from the body, reflecting the e… #
- Clearance: The rate at which a drug is removed from the body, reflecting the efficiency of drug metabolism and elimination by organs such as the liver or kidneys.
13. Intraoperative Drug Management #
Intraoperative drug management involves the judicious administration of medicati… #
Anesthesia providers must carefully monitor drug dosages, titrate medications, and respond to changes in the patient's condition.
- Titratable Medications: Drugs that can be adjusted in dosage to achieve a desi… #
- Titratable Medications: Drugs that can be adjusted in dosage to achieve a desired effect, such as intravenous anesthetics or vasoactive agents.
- Bolus Dosing: Rapid administration of a medication to achieve a desired effect… #
- Bolus Dosing: Rapid administration of a medication to achieve a desired effect, followed by continuous infusions or intermittent doses to maintain therapeutic levels.
- Drug Calculations: Mathematical calculations used to determine drug dosages ba… #
- Drug Calculations: Mathematical calculations used to determine drug dosages based on patient weight, drug concentration, infusion rates, and pharmacokinetic parameters.
14. Resuscitation Medications #
Resuscitation medications are drugs used to treat life #
threatening emergencies, such as cardiac arrest, severe hypotension, or anaphylaxis, during surgery. These medications aim to restore vital functions, stabilize the patient's condition, and prevent irreversible harm.
- Epinephrine: A potent vasoconstrictor and bronchodilator used in cardiac arres… #
- Epinephrine: A potent vasoconstrictor and bronchodilator used in cardiac arrest, anaphylaxis, and severe hypotension to increase blood pressure and restore circulation.
- Vasopressors: Medications that constrict blood vessels and increase blood pres… #
- Vasopressors: Medications that constrict blood vessels and increase blood pressure, such as norepinephrine or phenylephrine, used to treat hypotension and shock.
- Antiarrhythmics: Drugs that regulate heart rhythms and prevent or treat arrhyt… #
- Antiarrhythmics: Drugs that regulate heart rhythms and prevent or treat arrhythmias, such as amiodarone or lidocaine, administered during cardiac emergencies.
15. Postoperative Pain Management #
Postoperative pain management involves the administration of analgesic medicatio… #
Effective pain management promotes early ambulation, prevents complications, and enhances patient satisfaction.
- Patient-Controlled Analgesia (PCA): A method of pain management that allows pa… #
- Patient-Controlled Analgesia (PCA): A method of pain management that allows patients to self-administer pain medication through a programmable pump, controlling their pain levels within preset limits.
- Epidural Analgesia: A regional anesthesia technique that involves injecting an… #
- Epidural Analgesia: A regional anesthesia technique that involves injecting analgesic medication into the epidural space to provide prolonged pain relief after major surgery.
- Non-Opioid Analgesics: Pain-relieving medications that do not belong to the op… #
- Non-Opioid Analgesics: Pain-relieving medications that do not belong to the opioid class, such as acetaminophen or nonsteroidal anti-inflammatory drugs (NSAIDs).
16. Anesthesia Technology #
Anesthesia technology refers to the specialized equipment, devices, and monitori… #
These technologies help maintain patient vital signs, administer medications, and ensure optimal anesthesia delivery.
- Anesthesia Machine: A device that delivers a precise mixture of gases, oxygen,… #
- Anesthesia Machine: A device that delivers a precise mixture of gases, oxygen, and anesthetic agents to patients during surgery, equipped with safety features, alarms, and ventilation controls.
- Pulse Oximeter: A monitoring device that measures oxygen saturation in the blo… #
- Pulse Oximeter: A monitoring device that measures oxygen saturation in the blood by emitting and detecting light through a patient's skin, providing real-time feedback on respiratory status.
- Anesthesia Workstation: A system that integrates anesthesia delivery, patient… #
- Anesthesia Workstation: A system that integrates anesthesia delivery, patient monitoring, and data recording capabilities in a single unit, enhancing efficiency and safety in the operating room.
17. Regional Anesthesia Techniques #
Regional anesthesia techniques involve blocking nerve pathways to specific regio… #
These techniques may include peripheral nerve blocks, epidural injections, or spinal anesthesia.
- Peripheral Nerve Blocks: Injections of local anesthetics near peripheral nerve… #
- Peripheral Nerve Blocks: Injections of local anesthetics near peripheral nerves to block sensation in a specific body part, such as a brachial plexus block for upper extremity surgery.
- Epidural Analgesia: Administration of analgesic medication into the epidural s… #
- Epidural Analgesia: Administration of analgesic medication into the epidural space to provide pain relief for abdominal, thoracic, or lower extremity surgeries.
- Spinal Anesthesia: Injection of local anesthetics into the cerebrospinal fluid… #
- Spinal Anesthesia: Injection of local anesthetics into the cerebrospinal fluid in the spinal canal to induce anesthesia for lower abdominal, pelvic, or lower extremity surgeries.
18. Inhaled Anesthetics #
Inhaled anesthetics are volatile liquids or gases that are vaporized and inhaled… #
These agents provide rapid onset, easy titration, and minimal metabolism, making them suitable for general anesthesia.
- Minimum Alveolar Concentration (MAC): The concentration of an inhaled anesthet… #
- Minimum Alveolar Concentration (MAC): The concentration of an inhaled anesthetic required to prevent movement in response to a surgical stimulus in 50% of patients, a measure of anesthetic potency.
- Blood-Gas Partition Coefficient: The ratio of anesthetic concentration in bloo… #
- Blood-Gas Partition Coefficient: The ratio of anesthetic concentration in blood to that in gas at equilibrium, influencing the rate of induction, recovery, and redistribution of inhaled anesthetics.
- Closed-Circuit Anesthesia: A system that recirculates exhaled gases, conservin… #
- Closed-Circuit Anesthesia: A system that recirculates exhaled gases, conserving anesthetic agents and reducing pollution, waste, and operating room costs.
19. Anesthesia Emergencies #
Anesthesia emergencies are sudden, life #
threatening events that may occur during surgery, requiring immediate recognition, intervention, and management by anesthesia providers. These emergencies can result from equipment failure, drug reactions, patient factors, or surgical complications.
- Malignant Hyperthermia: A rare but serious reaction to certain anesthetic agen… #
- Malignant Hyperthermia: A rare but serious reaction to certain anesthetic agents, characterized by hypermetabolism, muscle rigidity, and hyperthermia, requiring prompt treatment with dantrolene.
- Anaphylaxis: A severe allergic reaction to medications used during anesthesia,… #
- Anaphylaxis: A severe allergic reaction to medications used during anesthesia, leading to systemic symptoms such as hypotension, bronchospasm, and cardiovascular collapse, necessitating resuscitation with epinephrine.
- Airway Obstruction: Blockage of the air passages that prevents adequate oxygen… #
- Airway Obstruction: Blockage of the air passages that prevents adequate oxygenation and ventilation, requiring immediate airway management, suctioning, or intubation to restore breathing.
20. Anesthesia Documentation #
Anesthesia documentation involves recording detailed information about the patie… #
Accurate documentation is essential for continuity of care, quality assurance, and medico-legal purposes.
- Anesthesia Record: A comprehensive document that includes preoperative assessm… #
- Anesthesia Record: A comprehensive document that includes preoperative assessment, intraoperative events, medications administered, fluid balance, vital signs, and postoperative handover information.
- Electronic Medical Record (EMR): A digital system that stores patient health i… #
- Electronic Medical Record (EMR): A digital system that stores patient health information, including anesthesia records, laboratory results, imaging studies, and medication lists, accessible to healthcare providers for decision-making.
- Quality Improvement: Initiatives that aim to enhance patient outcomes, safety,… #
- Quality Improvement: Initiatives that aim to enhance patient outcomes, safety, and satisfaction by analyzing anesthesia data, identifying areas for improvement, and implementing evidence-based practices in anesthesia care.
21. Anesthesia Equipment #
Anesthesia equipment comprises devices, instruments, and tools used to deliver a… #
Proper maintenance, calibration, and testing of anesthesia equipment are essential for patient care and regulatory compliance.
- Anesthesia Machine: A complex device that delivers a precise mixture of gases,… #
- Anesthesia Machine: A complex device that delivers a precise mixture of gases, oxygen, and anesthetic agents to patients, equipped with ventilators, vaporizers, scavenging systems, and pressure monitors.
- Anesthetic Vaporizer: A component of the anesthesia machine that converts liqu… #
- Anesthetic Vaporizer: A component of the anesthesia machine that converts liquid anesthetic into vapor for inhalation by the patient, ensuring accurate delivery and concentration control.
- Anesthesia Ventilator: A mechanical device that assists patients in breathing… #
- Anesthesia Ventilator: A mechanical device that assists patients in breathing during anesthesia, delivering controlled volumes of air, oxygen, or a mixture of gases to maintain oxygenation and ventilation.
22. Anesthesia Safety #
Anesthesia safety refers to the practices, protocols, and guidelines implemented… #
Safety measures include patient identification, medication verification, equipment checks, and communication protocols.
- Time-Out Procedure: A preoperative safety check conducted by the surgical team… #
- Time-Out Procedure: A preoperative safety check conducted by the surgical team to verify patient identity, surgical site, and procedure, ensuring alignment and understanding before anesthesia induction.
- Medication Reconciliation: The process of comparing a patient's current medica… #
- Medication Reconciliation: The process of comparing a patient's current medication regimen with the prescribed anesthesia medications to prevent errors, interactions, or omissions that could compromise patient safety.
- Incident Reporting: A system that allows healthcare providers to report near m… #
- Incident Reporting: A system that allows healthcare providers to report near misses, adverse events, or safety concerns related to anesthesia, facilitating root cause analysis, corrective actions, and quality improvement initiatives.
23. Anesthesia Pharmacology #
Anesthesia pharmacology involves the study of how anesthetic agents, sedatives,… #
Understanding pharmacokinetics, pharmacodynamics, and drug interactions is essential for safe and effective anesthesia practice.
- Context-Sensitive Half-Time: The time it takes for a drug's plasma concentrati… #
- Context-Sensitive Half-Time: The time it takes for a drug's plasma concentration to decrease by 50% after a continuous infusion, influenced by drug accumulation, redistribution, and metabolism.
- Receptor Theory: The concept that drugs exert their effects by binding to spec… #
- Receptor Theory: The concept that drugs exert their effects by binding to specific receptors on cells, altering cellular signaling pathways and physiological responses, such as GABA receptors for sedatives or opioid receptors for analgesics.
- Minimum Alveolar Concentration (MAC): The concentration of an inhaled anesthet… #
- Minimum Alveolar Concentration (MAC): The concentration of an inhaled anesthetic required to prevent movement in response to a surgical stimulus in 50% of patients, a measure of anesthetic potency.
24. Anesthesia Induction #
Anesthesia induction is the process of transitioning a patient from a conscious… #
This phase involves the administration of anesthetic agents, airway management, and monitoring vital signs to ensure a smooth transition to anesthesia.
- Rapid Sequence Induction (RSI): A technique used to rapidly induce anesthesia… #
- Rapid Sequence Induction (RSI): A technique used to rapidly induce anesthesia in patients at risk of aspiration, involving the administration of sedatives and neuromuscular blockers to secure