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All treatments for CNS tumors have significant risks and side-effects. In cases where tumors are slow growing and do not cause symptoms, it may be preferable to closely watch the patient's condition without any treatment, until new test results or symptoms indicate that the patient's condition has worsened.
Myelinated axons only allow action potentials to occur at the unmyelinated nodes of Ranvier that occur between the myelinated internodes. It is by this restriction that saltatory conduction propagates an action potential along the axon of a neuron at rates significantly higher than would be possible in unmyelinated axons (150 m/s compared from 0.5 to 10 m/s). [1]
Saltatory conduction provides one advantage over conduction that occurs along an axon without myelin sheaths. This is that the increased speed afforded by this mode of conduction assures faster interaction between neurons. On the other hand, depending on the average firing rate of the neuron, calculations show that the energetic cost of ...
Myelin's best known function is to increase the rate at which information, encoded as electrical charges, passes along the axon's length. Myelin achieves this by eliciting saltatory conduction. [1] Saltatory conduction refers to the fact that electrical impulses 'jump' along the axon, over long myelin sheaths, from one node of Ranvier to the next.
Doctor reviewing a radiation treatment plan. In radiotherapy, radiation treatment planning (RTP) is the process in which a team consisting of radiation oncologists, radiation therapist, medical physicists and medical dosimetrists plan the appropriate external beam radiotherapy or internal brachytherapy treatment technique for a patient with cancer.
Cancer treatments are a wide range of treatments available for the many different types of cancer, with each cancer type needing its own specific treatment. [1] Treatments can include surgery, chemotherapy, radiation therapy, hormonal therapy, targeted therapy including small-molecule drugs or monoclonal antibodies, [2] and PARP inhibitors such as olaparib. [3]
Conduction Block: It occurs when action potentials fail to propagate down the nerve. This is usually due to an extensive loss of myelin that saltatory conduction no longer works, and thus, no signal can be transmitted. A conduction block is apparent on an NCS through a significant drop in amplitude of over 50% “across the area of injury.” [11]
A Guideline Comparison utility that gives users the ability to generate side-by-side comparisons for any combination of two or more guidelines; Guideline Syntheses prepared by NGC staff, comparing guidelines covering similar topics, highlighting areas of similarity and difference.