Read e-book online Adams and Victor's Principles of Neurology (8th Edition) PDF

By Allan H. Ropper, Robert H. Brown

ISBN-10: 007141620X

ISBN-13: 9780071416207

A new tackle the vintage, definitive textual content at the complete spectrum of neurology. Reflecting a contemporary method of neurology, Adams and Victor�s rules of Neurology, 8/e new layout highlights a extra whole and obtainable methods to remedy and medical administration recommendations. This completely revised variation positive aspects extra insurance of remedy and neuroimaging, renown symptoms sections built-in all through, and over 800 illustrations.

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Additional resources for Adams and Victor's Principles of Neurology (8th Edition)

Example text

However, new endovascular procedures for the ablation of aneurysms, arteriovenous malformations, and vascular tumors still require the incorporation of conventional angiography. Following local anesthesia, a needle is placed in the femoral or brachial artery; a cannula is then threaded through the needle and along the aorta and the arterial branches to be visualized. In this way, a contrast medium can be injected to visualize the arch of the aorta, the origins of the carotid and vertebral systems, and the extensions of these systems through the neck and into the cranial cavity.

Nuclear magnetic resonance can be detected from several endogenous isotopes, but current technology uses signals derived from hydrogen atoms (1H), because hydrogen is the most abundant element in tissue and yields the strongest magnetic signal. The image is essentially a map of the hydrogen content of tissue, therefore reflecting largely the water concentration, but influenced also by the physical and chemical environment of the hydrogen atoms. Different tissues have different rates of proton relaxation, yielding different signal intensities and hence tissue contrast.

The latter abnormalities may be meaningful, but only if correlated with particular clinical phenomena. Whereas borderline deviations in an otherwise entirely normal person have no clinical significance, the same minimal EEG findings associated with particular clinical signs and symptoms become important. The significance of a normal or “negative” EEG in certain patients suspected of having a cerebral lesion has been discussed above. In summary, the results of the EEG, like those of the EMG and electrocardiogram, are meaningful only in relation to the illnesses under consideration and the clinical state of the patient at the time the recordings were made.

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Adams and Victor's Principles of Neurology (8th Edition) by Allan H. Ropper, Robert H. Brown

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