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Paralysis is a very late sign of acute arterial ischemia and signals the death of nerves supplying the extremity. Foot drop may occur as a result of nerve damage. Because nerves are extremely sensitive to hypoxia, limb paralysis or ischemic neuropathy may persist after revascularization and may be permanent. [9]
Peripheral neuropathy may be classified according to the number and distribution of nerves affected (mononeuropathy, mononeuritis multiplex, or polyneuropathy), the type of nerve fiber predominantly affected (motor, sensory, autonomic), or the process affecting the nerves; e.g., inflammation (), compression (compression neuropathy), chemotherapy (chemotherapy-induced peripheral neuropathy).
Acute limb ischemia may also be caused by traumatic disruption of blood flow to a limb, which may present with either hard signs or soft signs of vascular injury. [15] Hard signs include pulsatile bleeding, expanding hematomas (collections of blood), or absent distal pulses, and must be taken to surgery emergently.
Occlusion of vasa nervorum at the level of the epineurial arterioles leads to ischemia of nerves, leading to vasculitic neuropathy. [3] [4] and has been implicated as the cause in a few cases of facial nerve paralysis. [3]
Nerve growth factor (NGF) typically has a low level of expression in nerves that are healthy and not growing or developing, but in response to nerve injury NGF expression increases in Schwann cells. This is a mechanism to increase growth and proliferation of Schwann cells at the distal stump in order to prepare for reception of the regenerating ...
The structure of peripheral nerves includes a small cell body at the spinal cord, and a very long axon that extends all the way to the innervation target. These nerves are as long as 1-1.5 meters (sciatic nerve). Most of the substances the axon needs to survive is manufactured in the cell body. [2]
Diabetic peripheral neuropathy (DPN) with superimposed nerve compression may be treatable in the limbs with multiple nerve decompressions. [ 34 ] [ 35 ] The theory behind this procedure is that DPN predisposes patients to nerve compression at anatomic areas of narrowing, and that a majority of symptoms of DPN are actually attributable to nerve ...
Distal axonopathy, is the result of interrupted function of the peripheral nerves. [9] It is the most common response of neurons to metabolic or toxic disturbances, and may be caused by metabolic diseases such as diabetes , kidney failure , connective tissue disease , deficiency syndromes such as malnutrition and alcoholism , or the effects of ...