Total Intravenous Anesthesia (TIVA)

Total intravenous anesthesia (TIVA) maintains general anesthesia entirely with intravenously infused drugs—most commonly a hypnotic combined with a short-acting opioid—rather than with inhaled volatile agents. Because no anesthetic gas is used, depth is controlled by infusion rate, often guided by pharmacokinetic models in target-controlled infusion systems that aim for a chosen blood or effect-site concentration.

Definition

Total intravenous anesthesia is a technique for maintaining general anesthesia using only intravenously administered agents—typically a continuously infused hypnotic and analgesic—without inhaled volatile anesthetics, with depth controlled through infusion rate and pharmacokinetic modeling.

Scope

The topic covers the principles of maintaining anesthesia by continuous intravenous infusion: the pharmacokinetic basis of titration, target-controlled infusion, and the safety considerations specific to an anesthetic in which depth cannot be read from an expired gas concentration. It contrasts TIVA with volatile maintenance and frames it as a reference overview rather than a protocol or dosing guide.

Core questions

• How is anesthetic depth controlled when no volatile agent and no expired-gas measurement are available?
• What is target-controlled infusion and how does it use pharmacokinetic models?
• What safety risks are specific to intravenous-only maintenance, such as infusion failure?
• When is TIVA preferred over inhalational maintenance?

Key concepts

• Continuous intravenous infusion
• Target-controlled infusion (TCI)
• Effect-site versus plasma concentration
• Pharmacokinetic-pharmacodynamic modeling
• Context-sensitive half-time
• Infusion-failure and awareness risk
• Depth-of-anesthesia monitoring during TIVA

Mechanisms

In TIVA the anesthetic state is produced by drugs whose brain concentration is governed by infusion rate, distribution, and clearance rather than by alveolar partial pressure. Target-controlled infusion pumps use validated pharmacokinetic-pharmacodynamic models to estimate the infusion profile needed to reach and hold a target plasma or effect-site concentration, and the context-sensitive half-time describes how recovery depends on how long the infusion has run. Because the relationship between infusion and brain concentration is modeled rather than directly measured, processed-EEG depth monitoring and vigilance against infusion failure are emphasized in safe-practice guidance.

Clinical relevance

TIVA is widely used where volatile agents are unsuitable or where lower postoperative nausea and smoother recovery are desired, and understanding it clarifies how anesthesia can be controlled without inhaled gases. This entry explains the concepts and safety logic of intravenous maintenance for reference and education; it is not a source of infusion settings or individualized clinical instructions.

Evidence & guidelines

National safe-practice guidelines for TIVA set out the equipment, monitoring, and vigilance required for infusion-based anesthesia, emphasizing the specific hazards of intravenous-only maintenance such as undetected infusion failure leading to awareness. Consensus nausea-and-vomiting guidance also identifies intravenous maintenance as a strategy for reducing postoperative nausea. These documents describe standards of practice rather than prescriptions for an individual.

History

Reliable total intravenous anesthesia became practical with the introduction of short-acting hypnotic and opioid agents whose effects could be titrated and would dissipate predictably after the infusion stopped. The subsequent development of computer-controlled target-controlled infusion pumps, driven by pharmacokinetic modeling, allowed clinicians to aim for a specified drug concentration and made infusion-based maintenance a routine alternative to volatile agents.

Debates

TIVA versus volatile maintenance and the risk of awareness

TIVA may reduce nausea and offer other recovery benefits, but because depth cannot be confirmed from an expired gas concentration, concerns about awareness from infusion failure have made depth monitoring and equipment safeguards central—and the overall balance of benefits versus risk against volatile maintenance remains debated.

Key figures

• Anthony R. Absalom
• Alastair F. Nimmo
• Emery N. Brown

Seminal works

• nimmo-2018-tiva
• brown-2018

Frequently asked questions

How is TIVA different from inhalational anesthesia?

In TIVA, anesthesia is maintained entirely with drugs given through a vein and controlled by infusion rate, whereas inhalational anesthesia uses a volatile agent delivered as a vapor; because no expired anesthetic gas is measured during TIVA, depth control relies on pharmacokinetic models and monitoring.

What is target-controlled infusion?

Target-controlled infusion is a method in which a computer-controlled pump uses a pharmacokinetic model to deliver a drug at the rate predicted to reach and maintain a chosen blood or brain concentration, allowing the clinician to set a target rather than a fixed infusion rate.