During the last decade, the effects of anaesthetics on cerebral blood flow, cerebral metabolic rate of oxygen and intracranial pressure have been studied experimentally and clinically. In this review studies of CBF and CMRO2 during craniotomy have been performed with the classical technique described by Kety and Schmidt. In chapter 1 general considerations concerning the effects of anaesthetics on cerebral blood flow and metabolism are reviewed. In chapters 2 and 3 the effects of inhalation agents and hypnotics on flow and metabolism are considered. Chapters 4 and 5 cover the effects of central analgetics, and neuromuscular blocking agents. In chapter 6 the effects of other drugs in common use in neuroanaesthetic practice are summarized. Chapter 7 considers the effects of drugs used for controlled hypotension. In chapter 8 the application of Kety's method in studies of CBF and metabolism is reviewed, the studies of cerebral circulation and metabolism during nine different techniques of anaesthesia for craniotomy are presented, and other studies of cerebral circulation during neuroanaesthesia are reviewed. In chapter 9 considerations concerning central and cerebral hemodynamics during anaesthesia in the sitting position are considered. This review is primarily addressed to anaesthetists, but it will also be of interest to those working within neurosurgery, neuroradiology and clinical neurophysiology.

Drug dosage in renal insufficiency has become an toxication. In 1975, his Poison Index was pub important facet of nephrology, a subspeciality of lished, first in German, and two years later in internal medicine which is only 30 years young but English, with supplements in 1979 and 1983. This constantly growing in scope and importance. Two volume has become an obligatory reference in more thirds of all drugs are partially, mainly, or exclu than 2500 dialysis units. sively excreted by the kidneys. In the presence of Based on GOnter Seyffart's experience and renal insufficiency, dose adjustments are therefore knowledge in this field, the plans for this book obligatory. In patients on dialysis, drug elimination matured in 1984, a logical step in view of his by this route must also be considered. untiring effort and diligence. In order to deal with As the reader of this book will discover, 20 more than 1200 different drugs and almost 4000 percent of currently used drugs are contraindicated references, 21 contributors were sollicited, while it where there is any degree of renal insufficiency, took six years to complete the work. The major and for at least another 60 percent a dose reduc share of the effort was thus left to the main author tion is required. It is obvious, therefore, that the and editor and he has produced a concise work of detailed knowledge required can never be com impressive clarity.

Currently blood is a volatile issue. The safety of blood and the quantification of transfusion risks have been dominant themes that have stimulated the development of alternative approaches in this rapidly developing area. In clinical medicine conventional blood and its components are used in supportive therapies dependent on the choice of apparent uncritical trigger factors. A compounding factor is depth of prospective clinical trials for evidence. Such trials in critical care areas would be of enormous value, not only in recording adverse effects and under-transfusion, but also indicating the value of decision analysis and cost-effectiveness in transfusion practice. Alternative approaches include the use of cytokines, growth factors, humanised monoclonal antibodies, recombinant plasma factors, and buffy coat derived natural human interferons. These are being increasingly implemented in the clinic. Solutions for oxygen transport are being developed and fibrinogen coated microcapsules are being investigated for thrombocytopenia. In surgical patients, various crystalloid and colloid combinations are explored as volume replacements. To avoid allogeneic transfusions, beneficial blood saving methods include various strategies, such as autologous deposits, normovolemic haemodilution and various agents including aprotinin, tranecamic acid, desmopressin and erythropoietin, but their use in hospital shows considerable variations. That umbilical cord blood could be a significant source of allogeneic stem cells in related and unrelated transplantation is illustrated by the increasing number of cord blood banks in Europe and elsewhere. Future blood resources are likely to face several challenges: immediate challenges relate to increased regulatory and political oversights; intermediate solutions would offer some improvements in public health and alleviate public fear but probably not address the economic challenges thrust upon the medical care system. As we approach the year 2000, the major concerns about transfusion medicine remain its logistics, safety and effectiveness. This theme is presented in the proceedings of the 22nd International Symposium on Blood Transfusion, developed in 21 up-to-date topics, collected and discussed in four sections. This book will be of timely value to students, professionals and all others interested or involved in the field of transfusion medicine, whether clinical or related.

Since its launch in 1998 the European Society for Intravenous Anaesthesia (EuroSIVA) has come a long way in providing educational material and supporting the research and clinical application of intravenous anaesthesia. After the first two annual meetings held in Barcelona and Amsterdam in 1998 and 1999, three other successful meetings took place in Vienna, Gothenburg and Nice in 2000, 2001 and 2002. Next to these main meetings, starting in the year 2000, a smaller winter meeting has been organised every last week of January in Crans Montana, Switzerland. Both the main summer and the winter meetings breathe the same atmosphere of sharing the latest on intravenous anaesthesia research in the presence of a friendly environment and good company. Since the first meetings the educational tools of EuroSIVA have increased in quantity and technical quality allowing digital slide and video presentation along with the use of the computer simulation program TIVAtrainer during the speaker sessions and the workshops. Furthermore, EuroSIVA now exploits a website www. eurosiva. org that allows for continuous exchange of information on intravenous anaesthesia, the TIVAtrainer, the EuroSIVA meetings and online registration for these meetings. The EuroSIVA is currently engaged in friendly contacts with the Asian Oceanic Society for Intravenous Anaesthesia (AOSIVA), the United Kingdom Society for Intravenous Anaesthesia (UKSIVA), the Korean Society for Intravenous Anaesthesia (KSIVA), the European Society of Anaesthesiology (ESA) and the International Society for Applied Pharmacology (ISAP).

On 15 November 1997, the first international symposium "Neural and Chemical Control of Breathing: Pharmacological and Clinical Aspects" was held at Leiden University Medical Center on the occasion of the retirement of one of the members of the Control of Breathing Research Group of the Departments of Physiology and Anesthesiology, Dr. Aad Berkenbosch. Among others, Dr. Berkenbosch, played an important role in this research group, which made a large and significant contribution to scientific research on the regulation of breathing. This book presents the proceedings of that meeting together with papers of several authors who have strong bonds with the Leiden Departments of Physiology and Anesthesiology. All studies represent state of the art work on the subject of respiratory control and cardiovascular medicine, with emphasis on the physiological, pharmacological and anesthesiological aspects of both fields. The book is divided in several sections: Oxygen Physiology. Prof. John Severinghaus presents among other things his ideas on oxygen sensing and high altitude related diseases. Prof. Honda gives results from studies in a unique set of subjects without carotid bodies. The findings of Honda's group support the idea that an intact hypoxic drive from the carotid bodies is necessary for the generation of central hypoxic depression. Dr. Hans van Beek discusses the effects of hypoxia and hypercapnia on cardiac contractility in animal models. Prof. Oeseburg demonstrates the feasibility of Near Infra Red Oximetry for monitoring tissue oxygenation in patients. Central Chemoreception.

Anesthesia and the Lung 1992 presents recent advances in the diagnosis, pre-, intra-, and postoperative anesthetic management of patients with lung disease, presenting for pulmonary and non-pulmonary surgery. It also deals with ventilation-perfusion issues, the lung as a metabolic organ, the effects of anesthesia on pulmonary mechanics and pulmonary blood flow. In addition, there are chapters that focus on hypoxia; regional differences in the lung; pulmonary surfactant; recent advances in the understanding of pulmonary edema; high altitude disease; anesthesia and the control of breathing; recent development in oximetry; instrumentation designed to measure pulmonary oxygen tension, pO2 and pCO2 transcutaneously; differential lung ventilation; reactive airways; septic shock; the adult respiratory distress syndrome and numerous aspects of ventilatory support.

The small neck of the aneurysm afforded an easy surgical attack. An ordinary flat silver clip was placed over the sac and tightly compressed obliterated it completely. The clip was flush with the wall of the carotid artery. The sac, lateral to the silver clip, was then picked up with the forceps and thrombosed by the electocautery. Walter Dandy reporting his successful operation of a posterior communicating aneurysm on March 23, 1937. Walter Dandy's patient left the hospital in good health 2 weeks later, and from his report one may gain the impression that the operation was an easy task. Despite continuous developments during the following decades, it was not until the introduction of the operating microscope and microsurgical techniques that surgical treatment was generally accepted. During the microsurgical era surgical results have continued to improve due to diagnostical, neuroanaesthesi ological, and microsurgical refinements, and improved neurointensive care. Endovascular obliteration has become an important treatment alternative but this has not been included in this particular volume. The purpose of the present supplement of the ACTA NEUROCHIRURGICA is to review some of the elements in the neurosurgical management of patients with aneurysmal subarachnoid haemorrhage that are important for a successful outcome. Professor Helge Nornes has been a major force in the development of new techniques and research strategies in this area for a number of years and has recently retired from the National Hospital in Oslo."

Cardiac Pacement has undergone a rapid development in technique and application in the last years. Methods of cardiac pacement have become more successful but also more complicated. This book is written for internists in their practice and also for the specialists in cardiology to improve their therapeutic measures being informed about specific problems in cardiac pacement. Apart from the basics of cardiac pacement also indications, selection of pacers, implantation methods and complications are described. A special focus is on postoperative monitoring of the patient. A vast amount of illustrations is combined with very instructive text. This book is for daily practice and desk reference for practicioners and clinicians.

The field of neural control of breathing has advanced rapidly in the past two decades, with the emergence of many new and promising research directions of increasing sophistication. The complexity and diversity of the current methodologies signify its remarkable vivacity, albeit at the price of much confusion. Captured in this book are the broad and intricate nature of the field and its multifaceted frontiers, including aspects of genetics, cell and molecular biology, comparative biology, neurophysiology, neurochemistry, neuroanatomy, imaging, human physiology in health and disease, and influence of environmental factors. Major topics include chemosensitivity, respiratory sensation, respiratory neurons, rhythmogenesis, plasticity, development, chemoreflex and exercise, respiratory instability and variability with behavioral and sleep states, etc., which are systematically laid out in the book for easy referencing.

Anesthesia and the Central Nervous System is a textbook for a postgraduate course as well as a reference for all anesthesiologists which presents many of the latest concepts in anesthesiology within a brief formal presentation. An outstanding faculty presents topics relating to the biochemistry, physiology, and pharmacology of the nervous system, the anesthetic management of intracranial and spinal cord surgery, and the intensive care management of central nervous system disease. Each chapter is a brief but sharply focused glimpse of the interests in anesthesia. This textbook is the eleventh in a continuing series documenting the proceedings of the Postgraduate Course in Salt Lake City.

The topics in this book represent the presentations given at the First and Second Annual Meetings entitled "Critical Issues in Surgery" held at the Frenchman's Reef Beach Resort, st. Thomas, U.S. Virgin Islands, November 1992 and 1993. This symposium was sponsored by the Department of Surgery, and the Department of Nursing Education and Quality Assurance of Cooper Hospital/University Medical Center, the University of Medicine and Den tistry of New Jersey, Robert Wood Johnson Medical School, Camden, New Jersey, as well as the Academy of Medicine of New Jersey. Chapter authors were charged with the task of writing brief overviews of major issues related to the field of general surgery and critical care medicine. The book is specifically tailored to the needs of general surgeons, allied health professionals and nursing personnel involved in all phases of caring for the surgical patient. Although intended as a reference source with emphasis on up-dated approaches applied in general surgery, it is hoped that the discussion of these topics will compliment other texts and manuscripts. Obviously, a book of this length cannot cover the whole multidiSCiplinary and complex field of surgery. However, the co-editors are certain that the annual appearance of this text will highlight comprehensive, new and interesting approaches to the field of surgery."

The seventh "Oxford Conference" on Modeling and Control of Ventilation was held in the beautiful setting of Northem Ontario at the Grandview Inn in Hunstville. This meet- ing was called the Canadian Conference on Modeling and Control ofVentilation (CCMCV) to follow on LCMCV held in London, England, three years ago. The beautiful view over Fairy Lake greeted everyone in the moming and provided an ideal setting for many discus- sions about respiratory physiology and modeling. The Oxford Conferences began in 1971 when Dr. Richard Hercynski (a mathematical modeler with an interest in respiratory physiology) and Dr. Dan Cunningham (a respiratory physiologist with an interest in modeling) decided to organize a meeting "Modelling of a Biological Control System: Tbe Regulation of Breathing" in Oxford, England, in 1978. The meeting was a success, and it spawned aseries of meetings that have continued to today. A second conference was organized at Lake Arrowbead, Califomia, in 1982. After tbis, con- ferences were repeated at tbree-year intervals. My first Oxford Conference was at tbe abbey in Solignac, France, in 1985. Next, we met in tbe cabins overlooking Grand Lake, Colorado, in 1988. In 1991, we traveled to the training institute at the base ofMt. Fuji (or at least they tell us Mt. Fuji was out there--we never saw it because of a typhoon rolling through). Our last meeting was at Royal Holloway College (University of London) where we got to dine in a castle among artwork that required guards and an electronic security system.

As an addition to the European postgraduate training system for young neurosurgeons we began to publish in 1974 this series devoted to Advances and Technical Standards in Neurosurgery which was later sponsored by the European Association of Neurosurgical Societies. The fact that the English language is well on the way to becoming the international medium at European scientific conferences is a great asset in terms of mutual understanding. Therefore we have decided to publish all contributions in English, regardless of the native language of the authors. All contributions are submitted to the entire editorial board before publication of any volume. Our series is not intended to compete with the publications of original scientific papers in other neurosurgical journals. Our intention is, rather, to present fields of neurosurgery and related areas in which important recent advances have been made. The contributions are written by specialists in the given fields and constitute the first part of each volume. In the second part of each volume, we publish detailed descriptions of standard operative procedures, furnished by experienced clinicians; in these articles the authors describe the techniques they employ and explain the advantages, difficulties and risks involved in the various procedures. This part is intended primarily to assist young neurosurgeons in their post graduate training. However, we are convinced that it will also be useful to experienced, fully trained neurosurgeons."

In the past ten years, full-scale simulation training has become dramatically more evident in undergraduate and graduate medical education. This increase has been due pri marily to two factors: the development of new computer-driven technology and an interest in simulation-specific training techniques. Technologically, simulators have evolved from simple anatomical reproductions to full-scale accurate reproductions of anatomy and physiology powered by multiple computers. High-technology simulation centers run by teams of faculty are emerging as integral tools in fulfilling medical centers' educational missions. In addition, educational techniques specific to simulation, which have been de veloped and used by other industries for over half a century, are being applied to medical training. Aviation and aerospace have used sophisticated simulation since the 1950s to train pilots and astronauts. Extrapolating these methods for use in the medical world has been a natural course of events, particularly in specialties that require some of the same basic thought processes and interactions required of the pilot or astronaut. It is not surprising, then, that anesthesiology would be the medical specialty to take the lead in adding simula tion training to its educational programs. The anesthesiologist's job in the operating room is similar to that of a pilot in a cockpit, not in the specific tasks, but in decision making, technological and human interfaces, and crisis management."

A thoroughly revised second edition providing the knowledge and evidence-base needed for the perioperative practitioner, clarifying the underlying principles needed for an understanding of anaesthetic, surgical, and recovery practice. This book defines the level of knowledge required for perioperative practitioners and provides a comprehensive reference to the principles and practice of modern operating department practice. Featuring a diverse range of topics, it offers a multidisciplinary overview of new techniques and technologies, changes in medico-legal requirements, changes to professional accountability, and requirements for continuous professional development. Twelve new chapters cover healthcare ethics and professional regulation, health and safety, infection prevention and control, basic patient monitoring, human factors, and perioperative care of the paediatric patient. Incorporating a new focus on the provision of evidence-based practice and holistic care in all areas of perioperative care, this invaluable book is essential reading for anyone working in this sector, in both education and practice.

The Manual of Geriatric Anesthesia is a practical guide for physicians, residents, and students interested in the care of the elderly patient undergoing surgery. Although primarily written for anesthesiologists, other perioperative physicians and nurses will also find the information highly valuable. Highlights of the text include concise and clear discussions of preoperative assessment, anesthetic administration, the immediate postoperative care, as well as the more classic 'geriatric' topics such as the hip fracture patient, cataract surgery, postoperative delirium, dementia, ethics and end of life care. Clinical geriatric principles are woven into the text so that the reader can develop skills in geriatrics and develop a broader understanding of terminology and principles used in geriatric medicine.

Anesthesiology: A Comprehensive Review for the Written Boards and Recertification is a high-yield, streamlined study aid. It contains more than 1000 updated, realistic multiple-choice questions tailored to the question content of recent American Board of Anesthesiology (ABA) exams. To maximize reading efficiency, key messages are repeated and highlighted in the bullets. While focusing on most-frequently tested keywords by the ABA, this book also covers new "emerging" topics such as patient safety, statistics, and ethics. Well-chosen illustrations and graphs are used to enhance the learning experience. Also novel is a high-yield summary of the 60 most frequently tested topics and concepts to be reviewed just before taking the boards. With this book as guidance, readers will be able to efficiently prepare for the written primary certification or recertification anesthesiology board exam.

Professor Philip Bromage From the earliest stirrings of modern surgical anesthesia, novice surgeons struggling to learn from the living what there was a strong intuitive feeling that anesthesia of part they were denied an opportunity to learn from the dead_ of the body would be better for the patient than complete But that is largely nostalgia for a past era_ Today, the visual anesthesia of the whole organism. In 1848, James Young arts and the plastics industry have united to give us superb Simpson spent some time and effort seeking this elusive teaching models and techniques that did not exist a few goal, but after a few ingenious though unsuccessful experi decades ago, and they have developed two- and three ments, he gave up the search and turned back to general dimensional surrogate cadavers that are imbued with a anesthesia as the only practical solution to surgical pain more vivid artistry than ever existed on the marble slabs relief at that time_ amid the formalin reek of our old dissecting rooms_ earl Koller's simple but brilliant application of cocaine to This book is a fresh and highly successful attempt to repair some of the bridges that were burnt with the passing of the the eye in 1884 opened the door to a whole new universe of neural anatomy and pharmacology_ Within a decade or old anatomy days_ Together, the authors have contributed"

"A Quick Reference Text" Easy to read and practical in design, Neurocritical Care is the book specialists will turn to for quick reference. It concentrates on management problems, from diagnostic procedures to therapeutic strategies. Exact descriptions are given for treatment procedures, and it is easy to find the appropriate treatment for a given patient. "International Expertise" More than 100 authors from North America have contributed to the book. The different strategies used on either side of the Atlantic have been described, the sections on neuroimaging have been reviewed by a neuroradiologist. "Comprehensive in Scope" Both frequent and rare neurological diseases that may require critical care treatment and subjects of more general interest such as monitoring strategies, ethical problems, brain death and neurological disorders in internal medicine have been covered. Pathophysiology is also discussed, insomuch as it is important for understanding the treatment strategies.

Brain resuscitation is the therapeutic intervention for critically ill patients with severe brain damage, particularly the types caused by ischemia and hypoxia. The The objective of the International Symposium on Brain Resuscitation held in Ube, Yamaguchi Japan October 31 to November 2 1988, and sponsored by Yamaguchi University and the Japanese Ministry of Education, was to review our recent progress in brain resuscitation and to discuss controversies both basic and clinical. To my knowledge, this symposium was the first held in Japan. Our understanding of neuronal dysfunction due to ischemic/hypoxic insults at organ, cellular, and molecular levels has advanced significantly in the last two decades. We had therefore intended that this international symposium should broadly cover the topics which are of interest to both basic researchers and clinicians. Three hundred and twenty-five attendants, including twenty scientists from eight different countries, actively participated in discussion and exchange of new ideas and thoughts concerning brain resuscitation. This book comprises the re ports presented during the symposium which consisted of two main parts: basic and clinical. Although one single meeting can never be expected to solve any problems, meetings often highlight areas of ignorance and problems which are ripe for solving. It has been hard to review all the papers because of the multi plicity of the discussed topics, but the overview on brain resuscitation by Profes sor Bo K. Siesjo and the summary by Professor J."

The past few years have seen the publication of a large number of articles and not a few books on the subject of relief of intractable pain. New ideas have been put forward on pain mechanisms, new methods of treatment have been reported and improved results c1aimed, and a growing catalogue of complications oftreatment has been recorded. The vast and expanding literature on the subject poses for the reader the dual problems of surveil lance and of assessment. The object of the present book is to provide a critical and constructive review of current writings and ideas on a wide range of aspects of the nature of intractable pain, particularly of present day practice and new ideas on treatment. Each chapter is written by an acknowledged authority and the approach throughout is practical rather than academic. In editing the individual chapters an effort was made to achieve a contemporary approach and to eliminate material which was unduly historicalor retrospective in content. At the same time the individ ual style of the authors was retained as far as possible. For decades chronic pain has been a therapeutic 'no man's land'. For the surgeon pain was an unfortunate complication wh ich not infrequently followed surgery; for the physician it was a distressing symptom in a number of disease syndromes; to the psychiatrist it was one of a number of features in many cases of mental illness."

Neurophysiological recording is the major neuromonitoring technique employed in ICU. In addition, continuous recording of intracranial pressure has proved to provide infomation useful for critical care of the patient with severe brain damage. It is, however, difficult to assess neurochemical and/or metabolic environments of the brain with these conventional neuromoni toring techniques. Information regarding these changes, if available on a real-time basis, is undoubtedly useful for patient care. Many important developments in bedside techniques to monitor these changes have been achieved during the last few years. It was the consensus of the editors that a symposium to exchange knowledge concerning recent advances in such techniques would be valuable. With this background, the First International Symposium of Neuro chemical Monitoring in ICU held May 20-21, 1994, in Tokyo, Japan. It was not the intention of the organizers that this symposium should survey the whole field of neuromonitoring in ICU. The symposium was thus focused on clinical application of microdialysis, jugular venous oximetry, and near infrared spectroscopy, which currently appear to be the most promising techniques for monitoring neurochemical and metabolic changes in the brain in a clinical setting. We termed these techniques collectively as neuro chemical monitoring, contrasting them with neurophysiological monitoring in ICU. The concept that has motivated this symposium was to provide an opportunity to exchange up-to-date summaries on issues currently debated for these techniques. This volume is based on the papers presented at the symposium."

This aim of this book is to focus on a very common situation seen in medical practice, the acute catabolic state. This pathophysiological sit uation is rarely discussed as a separate entity, possibly because it is seen in all specialties of medicine and results from a great diversity of agents, insults, and diseases. It thus seemed to be high time to gather the most important and up-to-date knowledge on this entity, and the primary aim of the book is to offer a collection of updated information on the acute catabolic state. Another objective of the book is to make clear that, apart from the general response of the whole organism during the acute catabolic state, a series of organ-specific responses will also take place, which must also be considered during treatment. It has become very clear of these organ-spe from working on this book that current knowledge cific responses is very sparse and in some areas almost nonexistent; this book thus also focuses on the responses and changes which take place in different organs during the acute catabolic state and the inter action between these organs and their responses.

The volatile anesthetics continue to be one of the most mysterious yet commonly used class of drugs in medical practice today. A prominent and troublesome side effect of volatile anesthetics is their ability to alter hemodynamics. This arises from two diverse but interrelated phenomena, depression of cardiac contractility and dilation of the vasculature. These effects of volatile anesthetics on cardiac and smooth muscle plus the action of volatile anesthetics on skeletal muscle in the malignant hyperthermic syndrome have led to concern about the interaction of volatile anesthetics (and other anesthetic agents) with calcium metabolism in the muscle cell. Many of the phenomena caused by anesthetics appear to have common mechanisms in all of the muscle types; however, the differences among skeletal, cardiac and smooth muscle also lead to distinct effects of the anesthetics in each. Given the diverse research disciplines which have been brought to hear on the mechanism of anesthetic alteration of contractility, the symposium from which this book originates was convened for the purpose of gathering those with common interests in anesthetic agents and their cellular and subcellular actions in muscle. The recent symposium had its origins in a small but exciting meeting that took place at the University of Texas at Houston in 1984. At that time, Robert Merin and Jacques Chelly convened a group of people who had interest in cardiac muscle and calcium antagonists.

Foreword by Walter J. Freeman.

The induction of unconsciousness using anesthetic agents demonstrates that the cerebral cortex can operate in two very different behavioral modes: alert and responsive vs. unaware and quiescent. But the states of wakefulness and sleep are not single-neuron properties---they emerge as bulk properties of cooperating populations of neurons, with the switchover between states being similar to the physical change of phase observed when water freezes or ice melts. Some brain-state transitions, such as sleep cycling, anesthetic induction, epileptic seizure, are obvious and detected readily with a few EEG electrodes; others, such as the emergence of gamma rhythms during cognition, or the ultra-slow BOLD rhythms of relaxed free-association, are much more subtle. The unifying theme of this book is the notion that all of these bulk changes in brain behavior can be treated as phase transitions between distinct brain states.

Modeling Phase Transitions in the Brain contains chapter contributions from leading researchers who apply state-space methods, network models, and biophysically-motivated continuum approaches to investigate a range of neuroscientifically relevant problems that include analysis of nonstationary EEG time-series; network topologies that limit epileptic spreading; saddle--node bifurcations for anesthesia, sleep-cycling, and the wake--sleep switch; prediction of dynamical and noise-induced spatiotemporal instabilities underlying BOLD, alpha-, and gamma-band Hopf oscillations, gap-junction-moderated Turing structures, and Hopf-Turing interactions leading to cortical waves.