Neurosurgery Rounds: Questions and Answers (eBook)

Mark R. Shaya, Cristian Gragnaniello, Remi Nader (Autoren)

eBook Download: EPUB

2025 | 3. Auflage
452 Seiten
Thieme Medical Publishers (Verlag)
978-1-68420-631-5 (ISBN)

Infos

<p><strong><em>An essential companion for neurosurgical rounds and exam preparation</em></strong></p> <p><cite>Neurosurgery Rounds: Questions and Answers, Third Edition</cite> by Mark Shaya, Cristian Gragnaniello, and Remi Nader reflects major advances in neurosurgery and neurological diseases since the publication of the prior edition. The reader-friendly book features contributions from renowned experts and covers major neurosurgical areas pertinent to neurosurgical residents, such as surgical anatomy, pathophysiology, and surgical techniques.</p> <p>This book is specifically designed to help prepare for both the written and oral board examinations. The oral board examination involves interaction with examiners; therefore, passing the exam is heavily dependent on the ability to communicate succinctly and precisely what to do in specific clinical situations. Organized in nine sections, this case-based book provides diverse coverage of multiple disciplines involved in the knowledge, care, and treatment of neurosurgical patients, including new topics, such as COVID-19.</p> <p><strong>Key Highlights</strong></p> <ul> <li>Encompasses innovative technologies, such as robotics, spinal navigation, gene therapy, endoscopy, and brain&ndash;computer interfaces</li> <li>More than 1,600 questions and answers, including brief case studies, test readers and provide a quick reference for neurosurgical rounds</li> <li>High-quality illustrations and radiographs enhance understanding of underlying pathologies and anatomy</li> </ul> <p>The book provides an excellent study prep for the written and oral neurosurgical boards. And for early-career neurosurgeons, this reference reinforces prevention of neurosurgical pitfalls and complications, while enhancing problem solving in difficult cases.</p> <p>This print book includes complimentary access to a digital copy on <a href='https://medone.thieme.com/'>https://medone.thieme.com</a>.</p> <p><strong>Publisher's Note: Products purchased from Third Party sellers are not guaranteed by the publisher for quality, authenticity, or access to any online entitlements included with the product.</strong></p>

Textauszug

2 Neurophysiology

2.1 General

1. How does magnesium prevent excitotoxicity in brain injury?

Magnesium readily crosses the blood–brain barrier (BBB) and blocks various subtypes of calcium and N-methyl-d-aspartate (NMDA) channels. ▶ [72]

2. What is the most abundant excitatory neurotransmitter in the brain?

Glutamate.

3. What cellular elements compose the BBB?

Endothelial cells, astrocyte end-feet, and pericytes. The capillary endothelial cells are connected by tight junctions ( ▶ Fig. 2.1).

Fig. 2.1 Blood–brain barrier showing capillary tight junction. (From: Rohkamm R. Color Atlas of Neurology. Stuttgart: Georg Thieme Verlag; 2004. ▶ [73])

4. What happens to platelet function after a subarachnoid hemorrhage?

It is enhanced, leading to an increase in platelet aggregates in the cerebral microcirculation. ▶ [74]

5. What happens to cerebral blood flow immediately after a subarachnoid hemorrhage?

It decreases. ▶ [74]

6. What is glycoprotein IIb/IIIa (GPIIb/IIIa)?

GPIIb/IIIa is a platelet surface integrin, which is a mediator of platelet aggregation.

7. What is in the dense granules of platelets?

Serotonin, adenosine triphosphate (ATP), and platelet-derived growth factor.

8. It is thought that a disturbed balance between which peptide and molecule plays a major role in the development of vasospasm?

Endothelin-1 (vasoconstriction) and nitric oxide (vasodilatation). ▶ [74]

9. What is the name of the reaction that states that a highly reactive hydroxyl radical could be generated from an interaction between superoxide and hydrogen peroxide?

The Haber–Weiss reaction. ▶ [75]

10. What is deferoxamine?

An iron chelator. Because intracerebral hemorrhage may result in iron toxicity to the brain, iron chelation may help reduce brain damage in these cases. ▶ [76]

11. What is the proposed mechanism of action of steroid treatment in blunt spinal cord injury?

Steroid treatment in blunt spinal cord injury is controversial. Steroids (when given within 8 hours of injury) are thought to have effects on local blood flow, inhibition of immunologic injury, and free radical–mediated lipid peroxidation and neuronal damage. ▶ [77]

12. What is S100B and how is it related to traumatic brain injury?

S100B is a protein belonging to a multigenic family of low-molecular-weight calcium-binding S100 proteins abundant in astrocytes. After traumatic brain injury, the S100B protein is released by astrocytes; this protein may be neuroprotective and/or neurotrophic. ▶ [78]

13. What is factor XIII and in what diseases is it deficient?

Factor XIII is an enzyme (protransglutaminase) that stabilizes the fibrin clot and is important for cross-linking fibrin in the clotting cascade. It is deficient in leukemia, liver disease, malaria, inflammatory bowel disease, disseminated intravascular coagulopathy, and Henoch–Schönlein purpura ( ▶ Fig. 2.2).

Fig. 2.2 Outline of blood clotting cascade. (From: Silbernagl S, Despopoulos A. Color Atlas of Physiology. 6th ed. Stuttgart: Georg Thieme Verlag; 2009. ▶ [79])

14. What is the (intracranial) Windkessel phenomenon?

The Windkessel phenomenon is the ability of the cerebral vasculature to expand and the ability of the cerebrospinal fluid (CSF) and venous blood to translocate to accommodate arterial pulsations and provide a smooth capillary flow in the brain. ▶ [80]

15. What is the ischemic penumbra?

The term ischemic penumbra has been used to define a region in which cerebral blood flow reduction has passed the threshold that leads to the failure of electrical but not membrane function. The neuron is functionally disturbed, but remains structurally intact. ▶ [81]

16. What is the role of infiltration with local anesthetic at the beginning of a case?

Infiltration with local anesthetic prevents the activation of nociceptors during surgery and substantially lessens the need for analgesic medication. ▶ [82]

17. Local anesthetic molecules are composed of a benzene ring and a quaternary amine separated by an intermediate chain. Which part of the molecule determines the metabolic pathway of the drug?

The intermediate chain. ▶ [82]

18. What is the structural unit of a gap junction?

The connexon is a proteinaceous cylinder with a hydrophilic channel and is the structural unit of the gap junction. Direct electrical communication between cells occurs through gap junctions and may be important in the pathogenesis of diseases of the nervous system including epilepsy ( ▶ Fig. 2.3). ▶ [83]

Fig. 2.3 Gap junction illustration. (From: Neuron Structure and Function. In: Silbernagl S, Despopoulos jr. A, ed. Color Atlas of Physiology. 7th Edition. Stuttgart: Georg Thieme Verlag KG; 2015. ▶ [79])

19. What are the functions of transforming growth factor β (TGF-β)?

TGF-β is a multifunctional polypeptide implicated in the regulation of various cellular processes including growth, differentiation, apoptosis, adhesion, and motility. Abnormalities in the TGF-β signaling pathway are implicated in the development and progression of brain tumors.

20. What enzyme is inhibited by acetazolamide?

Carbonic anhydrase. ▶ [84]

21. What is the difference between a bioactive Guglielmi detachable coil (GDC) and a platinum GDC?

The bioactive coil accelerates clot maturation and promotes the development of mature connective tissue and neointimal formation. The polymer used in bioactive coils is poly-glycolic/poly-L-lactic acid. ▶ [85]

22. What are matrix metalloproteinases?

A family of zinc-dependent endopeptidases that mediate vascular remodeling by degrading extracellular matrix components, such as collagen and elastin. ▶ [86]

23. What is the causative mutation in Crouzon’s syndrome?

Crouzon’s syndrome is caused by mutations in fibroblast growth factor receptor 2 (FGFR2), leading to constitutive activation of receptors in the absence of ligand binding. This syndrome is characterized by premature fusion of the cranial sutures that leads to abnormal cranium shape, restricted brain growth, and increased intracranial pressure.

24. How does baclofen work?

Baclofen is an agonist of γ-aminobutyric acid (GABA); it reduces the release of presynaptic neurotransmitters in excitatory spinal pathways.

25. What is hypsarrhythmia?

A chaotic, high-amplitude, generalized electroencephalographic pattern characteristic of infantile spasms. ▶ [87]

26. What is “subsidence” in relation to the aging spine?

Subsidence is the loss of vertebral column height that occurs normally with aging; it may also refer to the loss of graft height after surgery. The use of dynamic plates in the setting of anterior spinal fusion and fixation allows normal subsidence to occur and may help bony fusion, resulting in decreased incidence of construct failures.

27. What is the genetic defect in Gorlin’s syndrome?

Gorlin’s syndrome is an autosomal dominant disorder resulting from mutations in the patched (PTCH) gene that predisposes to neoplasia and widespread congenital malformations. ▶ [88]

28. What is recombinant activated factor VII (rFVIIa)?

rFVIIa can help prevent bleeding episodes especially in hemophilic patients with inhibitors to coagulation factors VIII and IX. Administration of rFVIIa given within 4 hours of a spontaneous intracranial hemorrhage can result in reduced hematoma growth and less intraventricular extension of the hematoma. rFVIIa has become the first-line agent in treating surgical and nonsurgical bleeding in many centers with efficacy at standard 90 μg/kg doses approaching 90%.

29. What is the name of the water...

Produkt-Details

• Erscheint lt. Verlag: 23.4.2025
• Sprache: englisch
• Themenwelt: Medizinische Fachgebiete ► Chirurgie ► Neurochirurgie
• Themenwelt: Medizin / Pharmazie ► Studium
• Schlagworte: Clerkship • neurosurgery • Q&A • Question and answer • rounds • Shaya • sub-internship
• ISBN-10: 1-68420-631-6 / 1684206316
• ISBN-13: 978-1-68420-631-5 / 9781684206315