Sanger Brown and Edward Schäfer before Heinrich Klüver and Paul Bucy: their observations on bilateral temporal lobe ablations.

Fifty years before a report on the complete bitemporal lobectomy syndrome in primates, known as the Klüver-Bucy syndrome, was published, 2 talented investigators working at the University College in London, England-neurologist Sanger Brown and physiologist Edward Schäfer-also made this discovery. The title of their work was "An investigation into the functions of the occipital and temporal lobes of the monkey's brain," and it involved excisional brain surgery in 12 monkeys. They were particularly interested in the then-disputed primary cortical locations relating to vision and hearing. However, following extensive bilateral temporal lobe excisions in 2 monkeys, they noted peculiar behavior including apparent loss of memory and intelligence resembling "idiocy." These investigators recognized most of the behavioral findings that later came to be known as the Klüver-Bucy syndrome. However, they were working within the late-19th-century framework of cerebral cortical localizations of basic motor and sensory functions. Details of the Brown and Schäfer study and a glimpse of the neurological thinking of that period is presented. In the decades following the pivotal work of Klüver and Bucy in the late 1930s, in which they used a more advanced neurosurgical technique, tools of behavioral observations, and analysis of brain sections after euthanasia, investigators have elaborated the full components of the clinical syndrome and the extent of their resections. Other neuroscientists sought to isolate and determine the specific temporal neocortical, medial temporal, and deep limbic structures responsible for various visual and complex behavioral deficits. No doubt, Klüver and Bucy's contribution led to a great expansion in attention given to the limbic system's role in action, perception, emotion, and affect-a tide that continues to the present time.

Brainstem Monitoring in the Neurocritical Care Unit: A Rationale for Real-Time, Automated Neurophysiological Monitoring.

Patients with severe traumatic brain injury or large intracranial space-occupying lesions (spontaneous cerebral hemorrhage, infarction, or tumor) commonly present to the neurocritical care unit with an altered mental status. Many experience progressive stupor and coma from mass effects and transtentorial brain herniation compromising the ascending arousal (reticular activating) system. Yet, little progress has been made in the practicality of bedside, noninvasive, real-time, automated, neurophysiological brainstem, or cerebral hemispheric monitoring. In this critical review, we discuss the ascending arousal system, brain herniation, and shortcomings of our current management including the neurological exam, intracranial pressure monitoring, and neuroimaging. We present a rationale for the development of nurse-friendly-continuous, automated, and alarmed-evoked potential monitoring, based upon the clinical and experimental literature, advances in the prognostication of cerebral anoxia, and intraoperative neurophysiological monitoring.

The advent of epilepsy directed neurosurgery: The early pioneers and who was first.

Efforts to treat epileptic seizures likely date back to primitive, manmade skull openings or trephinations at the site of previous scalp or skull injuries. The purpose may have been the release of "evil spirits," removal of "cerebral excitement," and "restoral of bodily and intellectual functions." With progressive discoveries in brain function over the past 100 to 300 years, the cerebral cortical locations enabling voluntary movements, sensation, and speech have been well delineated. The locations of these functions have become surgical targets for the amelioration of disease processes. Disease entities in particular cerebral-cortical areas may predispose to the onset of focal and or generalized seizures, which secondarily interfere with normal cortical functioning. Modern neuroimaging and electroencephalography usually delineate the location of seizures and often the type of structural pathology. If noneloquent brain regions are involved, open surgical biopsy or removal of only abnormal tissue may be undertaken successfully. A number of the early neurosurgical pioneers in the development of epilepsy surgery are credited and discussed in this article.

Modified brainstem auditory evoked responses in patients with non-brainstem compressive cerebral lesions.

The brainstem auditory evoked response (BAER) is sensitive to pontomesencephalic integrity, transtentorial brain herniation, and at times increased intracranial pressure (ICP). The authors report their experience utilizing a recently described rapid rate, binaural, click and 1,000-Hz tone-burst modification of the BAER (MBAER) in 22 symptomatic non-trauma patients with non-brainstem compressive space-taking cerebral lesions. The majority presented with mild to moderate clinical signs suggestive of increased ICP, and focal neurological deficits. The cerebral lesions, mostly tumors (17), averaged 4-5 cm in diameter, with radiological signs of mass effect such as flattening of the sulci, midline shift, and narrowing of the basal cisterns. A number of significant changes in Wave V and V (n) latency and less so amplitude were found in patients compared with age-matched normal volunteers, as well as those again studied after surgical decompression. Similar MBAER changes had been noted in normal volunteers placed in a dependent head position. Possible mechanisms to explain these findings are discussed. The methodology shows promise and if combined with automated peak recognition could make Neuro ICU monitoring practical.

Feasibility of Full Neuromuscular Blockade During Transcranial Motor Evoked Potential Monitoring of Neurosurgical Procedures.

BACKGROUND: Transcranial motor evoked potential (TcMEP) monitoring is conventionally performed during surgical procedures without or with minimal neuromuscular blockade (NMB) because of its potential interference with signal interpretation. However, full blockade offers increased anesthetic management options and facilitates surgery. Here, the feasibility of TcMEP interpretation was assessed during full NMB in adult neurosurgical patients. METHODS: Patients undergoing cervical or lumbar decompression received a rocuronium bolus producing 95% or greater blockade by qualitative train-of-four at the ulnar nerve. TcMEPs were recorded in bilateral thenar-hypothenar and abductor hallucis muscles. Adequacy of response for reliable signal interpretation was determined on the basis of repeatability and clarity, assessed by coefficient of variation and signal-to-noise ratio, respectively. RESULTS: All patients had at least 3 of 4 measurable TcMEP limb responses present during full NMB, and 70.8% of patients had measurable responses in all 4 limbs. In total, 82.2% of thenar-hypothenar responses and 62.8% of abductor hallucis responses were robust enough for reliable signal interpretation on the basis of clarity. In addition, 97.8% of thenar-hypothenar responses and 79.1% of abductor hallucis responses met the criteria for reliable signal interpretation on the basis of consistency. Patient demographics, medical comorbidities, and preoperative weakness were not predictive of absent responses during full NMB. CONCLUSIONS: TcMEP interpretation may be feasible under greater levels of NMB than previously considered, allowing for monitoring with greater degrees of muscle relaxation. Consideration for monitoring TcMEP during full NMB should be made on a case-by-case basis, and baseline responses without blockade may predict which patients will have adequate responses for interpretation.

The craniopagus malformation: classification and implications for surgical separation.

Craniopagus twins (CPT) are an uncommon, highly fascinating accident of nature. The clinical pathology of this complex entity is reviewed and placed in perspective. A logical classification aids understanding of the anomaly, and is essential to gauge outcome from separation attempts. 'Partial forms' lack significant shared dural venous sinuses (SDVS) and 'Total forms' with SDVS also exhibit more severe compressional brain distortion. Our classification consists of Partial Angular (PA), Partial Vertical (PV), Total Angular (TA) and Total Vertical (TV, formerly O'Connell Types I-III). Total vertical has a continuous cranium, and inter-twin axial facial rotation <40 degrees (Type I), 140-180 degrees (Type II) or intermediate (Type III). The term 'Angular' denotes an inter-twin longitudinal angle below 140 degrees , regardless of axial rotation. Our review categorized 64 well-delineated CPT, including 41 operative separation attempts in small children since initial success in 1952. Just over one-half were TV, almost one-third TA, and partial forms accounted for the remaining one-sixth. About 30% of CPT had shared or fused brain tissue, and a similar percentage of TA twins shared a posterior fossa. Partial forms had significantly higher birth weights, were separated at an earlier age (6 versus 11 months) and had lower mortality and better outcome compared with Total forms. A multi-staged surgical separation for Total CPT had a significantly better mortality than single-staged separation. Discussion emphasizes embryological, anatomical and clinical aspects of the malformation, with emphasis upon obstacles to a successful outcome.

Sir Hugh Cairns and World War II British advances in head injury management, diffuse brain injury, and concussion: an Oxford tale.

The authors trace the Oxford, England, roots of World War II (WWII)-related advances in head injury management, the biomechanics of concussion and brain injury, and postwar delineation of pathological findings in severe concussion and diffuse brain injury in man. The prominent figure in these developments was the charismatic and innovative Harvey Cushing-trained neurosurgeon Sir Hugh Cairns. Cairns, who was to closely emulate Cushing's surgical and scholarly approach, is credited with saving thousands of lives during WWII by introducing and implementing innovative programs such as helmets for motorcyclists, mobile neurosurgical units near battle zones, and the military usage of penicillin. In addition, he inspired and taught a generation of neurosurgeons, neurologists, and neurological nurses in the care of brain and spinal cord injuries at Oxford's Military Hospital for Head Injuries. During this time Cairns also trained the first full-time female neurosurgeon. Pivotal in supporting animal research demonstrating the critical role of acceleration in the causation of concussion, Cairns recruited the physicist Hylas Holbourn, whose research implicated rotary acceleration and shear strains as particularly damaging. Cairns' work in military medicine and head injury remain highly influential in efforts to mitigate and manage brain injury.

Robert W. Williams: Forgotten Pioneer of Spinal Мicrosurgery.

UNLABELLED: In the 1970's many neurosurgeons gradually adapted microsurgical techniques to spine surgery as the benefits of magnification, illumination, and use of fine instruments in cranial surgery became apparent. In the early 1970 s, Robert W. Williams, а neurosurgeon in private practice in Las Vegas, Nevada, independently began to devise spinal microneurosurgical techniques with the goal of improving surgical outcome in lumbar and cervical surgery. Much of his initial work with microlumbar discectomies and microcervical foraminotomies was presented at annual meetings of the American Association of Neurological Surgeons and Congress of Neurological Surgeons in the 1970s and 1980s. An outsider to organized academic neurosurgery, Dг. Williams found his work was received cautiously and with significant skepticism. He found the orthopedic spine surgery community and journals more receptive, thus much of his earlier work was published in the orthopedic literature. This resulted in an orthopedic and neurosurgical following which was unique at that time. Dr. William's interesting career and contribution to spinal microsurgery is outlined, demonstrating the contributions to surgery, both neurological and orthopedic, that can be achieved by a neurosurgeon in private practice. LEVEL OF EVIDENCE: N/A.

Mark Twain on phrenology.

Mark Twain was a noted 19th century American writer and humorist. He often elaborated upon the personalities of his characters, and his observational skills reflected a strong interest in psychology. Similarly, he found an interest in phrenology, a pseudoscience that purported to characterize personality traits according to elevations or depressions on the head. Twain's style is clearly reflected in the interesting essay he wrote regarding his personal experience with phrenology.

Feud and fable: the Sherrington-Horsley polemic and the delayed publication.

In the February and March 1894 pages of The Lancet and in private letters, Charles Sherrington and Victor Horsley exchanged angry accusations pertaining to primacy of research on the course of the pyramidal fiber tract as determined from studies in monkeys. The polemics appear not to have ended in a manner satisfactory to either one. Moreover, the dispute allegedly led to a remarkable delay in publication of one of Sherrington's major contributions, which pertained to the localization of the motor cortex in apes that was published in 1917. Here we examine the argument in detail including the comments of an intermediary, Professor Rubert Boyce. We also examine the evidence for the supposed delay in publication, and conclude that the account of the delay originated in John Fulton's 1952 obituary of Sherrington, and is not true. We suggest it has become a fable that should no longer be repeated.

The history of neurosurgical treatment of sports concussion.

Concussion has a long and interesting history spanning at least the 5 millennia of written medical record and closely mirrors the development of surgery and neurosurgery. Not surprisingly, much of the past and present experimental head injury and concussion work has been performed within neurosurgically driven laboratories or by several surgically oriented neurologists. This historical review chronicles the key aspects of neurosurgical involvement in sports concussion as related to the diagnosis, treatment, mitigation, and prevention of injury using the example of American football. In addition, we briefly trace the developments that led to our current understanding of the biomechanical and neurophysiological basis of concussion.

Early history of electroencephalography and establishment of the American Clinical Neurophysiology Society.

The field of electroencephalography (EEG) had its origin with the discovery of recordable electrical potentials from activated nerves and muscles of animals and in the last quarter of the 19th century from the cerebral cortex of animals. By the 1920s, Hans Berger, a neuropsychiatrist from Germany, recorded potentials from the scalp of patients with skull defects and, a few years later, with more sensitive equipment from intact subjects. Concurrently, the introduction of electronic vacuum tube amplification and the cathode ray oscilloscope was made by American physiologists or "axonologists," interested in peripheral nerve recordings. Berger's findings were independently confirmed in early 1934 by Lord Adrian in England and by Hallowell Davis at Harvard, in the United States. In the United States, the earliest contributions to human EEG were made by Hallowell Davis, Herbert H. Jasper, Frederic A. Gibbs, William Lennox, and Alfred L. Loomis. Remarkable progress in the development of EEG as a useful clinical tool followed the 1935 report by the Harvard group on the electrographic and clinical correlations in patients with absence (petit mal) seizures and altered states of consciousness. Technical aspects of the EEG and additional clinical EEG correlations were elucidated by the above investigators and a number of others. Further study led to gatherings of the EEG pioneers at Loomis' laboratory in New York (1935-1939), Regional EEG society formation, and the American Clinical Neurophysiology Society in 1946.

Frontolateral pins for halo ring placement: reassessment of a common neurosurgical procedure with CT measurements of skull thickness.

OBJECT: Halo orthosis placement is a common neurosurgical procedure for the treatment of cervical spine injuries. Frontal sinus puncture by the anterior pins may occur using standard techniques, and up to 30% are dissatisfied with forehead scarring, especially women and African Americans. METHODS: The authors describe a frontolateral (FL) anterior pin site placement supported by high-resolution CT scan skull thickness measurements. The standard supraorbital (SO) pin site is several centimeters above the lateral orbit, whereas the FL pin site is 2-3 cm posterolateral to the SO site. Frontolateral placement is just anterior to the temporalis muscle close to a triangular anterior projection of the temporal hairline. For quantitative information on skull thickness at the SO and FT pin sites, thin 0.625-mm CT scan measurements of the outer table, diploic space, and inner table were obtained in 40 adults (80 sites). RESULTS: The mean values for total skull thickness at the SO and FT sites were not significantly different. The inner table was significantly thicker at the FL site in both males and females, buttressed by the nearby greater sphenoid wing. The mean total skull thickness was significantly less in females than in males, but the values were not significantly different at the SO and FL sites. CONCLUSIONS: The FL and SO anterior pin sites are comparable with respect to skull thickness CT measurements, with a significantly thicker inner table at the FL site. In the senior author's experience, the FL anterior pin site yielded secure fixation without skull perforation, neurovascular injury, or propensity to infection. The cosmetic result of the FL site is more acceptable, and the authors recommend its general usage be adopted.

Frederic Gibbs and his contributions to epilepsy surgery and electroencephalography.

Frederic Gibbs' (1903-1992) long research career was devoted to the understanding and treatment of epileptic phenomena and closely associated with the development of electroencephalography (EEG). After medical school, he joined the Harvard Neurological Unit at Boston City Hospital directed by Stanley Cobb. In the early 1930s, Gibbs developed a thermoelectric blood flow probe and, with William Lennox, proved in animals and humans that a seizure increases cerebral blood flow. By 1934, Gibbs became a pioneer in the field of EEG while working at Harvard with Hallowell Davis and Lennox, and was the first to convincingly record and report EEG findings in epilepsy and states of altered consciousness. Several years later, Gibbs and Lennox were the first to recommend cerebral excisions in several patients with uncontrolled epilepsy based on EEG. Moving to the University of Illinois at Chicago in 1944, Gibbs founded a consultation clinic for epilepsy, performed the first EEG depth recordings using pneumoencephalography-guided stereotaxy, and noted that sleep EEGs in patients with psychomotor seizures frequently disclosed temporal epileptic patterns. Gibbs convinced Percival Bailey to collaborate on patients with refractory temporal lobe psychomotor seizures without tumors. In 1947, the first nonlesional temporal lobe excisions based on EEG localization were performed in these patients, and, by 1948, anterior temporal lobectomy had become their procedure of choice. Gibbs and Lennox received the coveted Lasker Award among other honors as pioneers in establishing the modern era of epilepsy diagnosis and treatment.

Modified brain stem auditory evoked potentials in patients with intracranial mass lesions.

The authors report their experience utilizing a recently described rapid rate, binaural click and 1000-Hz tone burst modification of the brain stem auditory evoked potentials (BAEP), modified (MBP), in 27 symptomatic patients with non-brain stem compressive space-taking cerebral lesions (22), hydrocephalus (4), and pseudotumor cerebri (1).  Many presented with clinical signs suggestive of increased intracranial pressure (ICP) and focal neurological deficits. The cerebral lesions, mostly large tumors with edema, had very substantial radiological signs of mass effect. Fourteen patients were also studied following surgical decompression. A number of significant changes in the wave V and Vn latency/intensity and less so amplitude/intensity function was found in the 27 patients, compared to normal volunteers, as well as those studied pre- and postoperatively. Similar MBP changes had been noted in normal volunteers placed in a dependent head position. Possible mechanisms to explain these findings are discussed.  The MBP methodology shows promise and further development could make neuro-intensive care unit monitoring practical.

Lessons learned from the New York State mental health response to the September 11, 2001, attacks.

OBJECTIVE: In the aftermath of the September 11, 2001, attacks on the World Trade Center, the public mental health system in New York City mounted the largest mental health disaster response in history, called Project Liberty. The successes and challenges of Project Liberty are evaluated. METHODS: The development of Project Liberty is summarized and analyzed from the perspective of the New York State and New York City officials and scientists who led the disaster response. Lessons learned that have implications for mental health support in future disaster responses are offered. RESULTS: A high level of interagency collaboration, engagement of nongovernmental organizations to provide services, media education efforts, and ongoing program evaluation all contributed to the program's successes. Mental health professionals' limited experiences with trauma, options for funding treatment, duration of clinical program, and existing needs assessments methodologies all proved challenging. CONCLUSIONS: Project Liberty was a massive and invaluable resource during the years of rebuilding in New York City in the wake of the attacks. Challenges faced have led to lessons of generalizable import for other mental health responses to large-scale events.