Anesthesia Overview - Concepedia

Principles

Definition

Anesthesia is a medically induced, reversible state characterized by a loss of sensation, often including unconsciousness, employed to prevent pain and discomfort during surgical, diagnostic, and therapeutic procedures. As a clinical and research concept, it involves the study of the pharmacological agents, physiological mechanisms, and clinical techniques used to safely achieve and manage this state, enabling complex medical interventions and improving patient care.

Ontological type

Pharmacologic Agents

Clinical Techniques

Adverse Effects and Complications

Key developments

Key Figures

Neurophysiological Foundations era

Philip R. Bromage [1] emerges as a central figure in the Neurophysiological Foundations era, with affiliations at McGill University [3] and Clark University [4] during this period. His key contributions include the 1961 paper Concentrations of lignocaine in the blood after intravenous, intramuscular epidural and endotracheal administration [7], which advanced understanding of local anesthetic pharmacokinetics and potential systemic toxicity, informing safer dosing and neuraxial techniques in this era. Edmond I. Eger [2] is similarly pivotal, with affiliations to the University of California, San Francisco [5] and the University of California, Berkeley [6] during this era. His 1964 Hyperthermia During Anesthesia [8] paper highlighted perioperative thermoregulatory risks and helped shape monitoring and safety practices for anesthesia in this era.

Multimodal Preemptive Analgesia era

Clifford J. Woolf[1], with University College London[3] and The University of Texas Medical Branch at Galveston[4], emerges as a central figure in multimodal and preemptive analgesia in this era. His key contribution in this era is the concept of Preoperative morphine pre-empts postoperative pain[7], demonstrating that preemptive analgesia can blunt postoperative pain and paved the way for multimodal strategies. Nicholas P. Franks[2], linked to Yale University[5] and Imperial College London[6], contributed to foundational questions about where general anaesthetics act in this era. His paper Where do general anaesthetics act?[8] examined the mechanisms and brain targets of anesthetics, providing a mechanistic basis crucial for dose optimization and multimodal approaches.

Risk-Stratified Perioperative Optimization era

Masatoshi Makuuchi [1] is associated with Harvard University [3] and Johns Hopkins University [4] in this era, contributing to anesthesia through risk-stratified, pathway-driven perioperative care. His key contribution, exemplified by the 2009 paper The Clavien-Dindo Classification of Surgical Complications [6], provided a standardized framework for reporting complications and risk assessment, which was crucial for risk-stratified perioperative optimization. Jean-Nicolas Vauthey [2], with Johns Hopkins University [4] and Baylor College of Medicine [5], contributed to perioperative risk-stratified care by promoting standardized complication reporting and dissemination of the Clavien-Dindo Classification [6]. This work underpins the era's emphasis on guideline-driven cardiovascular and antiemetic strategies, multimodal analgesia, and outcome benchmarking, supported by the Clavien-Dindo Classification [6].