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Chest X-ray showing a tumor in the left lung (right side of the image) The diagnosis is usually made with nerve conduction study (NCS) and electromyography (EMG), which is one of the standard tests in the investigation of otherwise unexplained muscle weakness. EMG involves the insertion of small needles into the muscles.
Corticosteroids often cause muscle weakness to some degree in patients. Symptoms are usually weakness of the proximal muscles, neck flexor, and in extreme cases, respiratory muscle weakness can also occur. [1] Corticosteroids have not only been found to cause some degree of muscle atrophy, but also a local or diffuse cell death. These side ...
The myopathic EMG demonstrates fibrillation potentials. The serum CK level will be normal or low normal. The muscle biopsy will demonstrate the nemaline rods, but as they are less than 1 μm in length they are easily overlooked. The sections must be trichromatically stained and sectioned at a thickness of 2 to 4 μm for effective visualization.
Brody disease (a disease of ion pump transport) has symptoms similar to myotonia congenita, however, the delayed muscle relaxation is pseudo-myotonia as the EMG is normal. [5] Other diseases that exhibit pseudo-myotonia are myositis , glycogen storage diseases , hyperkalemic periodic paralysis , root disease, anterior horn cell disorders ...
Symptoms include stiffness [1] and sometimes muscle cramping [4] after exercise (pseudo-myotonia) [5] and especially when exposed to cold. The most commonly affected muscles are in the arms, legs, and eyelids. [1] [4] Individuals with Brody myopathy also sometimes experience weakness, [4] myalgia, and rhabdomyolysis. [1]
Muscle weakness can also be classified as either "proximal" or "distal" based on the location of the muscles that it affects. Proximal muscle weakness affects muscles closest to the body's midline, while distal muscle weakness affects muscles further out on the limbs. Proximal muscle weakness can be seen in Cushing's syndrome [18] and ...
Cramp fasciculation syndrome (CFS) is a rare [1] peripheral nerve hyperexcitability disorder. It is more severe than the related (and common) disorder known as benign fasciculation syndrome; it causes fasciculations, cramps, pain, fatigue, and muscle stiffness similar to those seen in neuromyotonia (another related condition). [2]
Succinylcholine's ability to induce or worsen MG is unclear. It has been suggested to cause life-threatening side effects such as rhabdomyolysis, myotonia, and hyperkalemia in patients with muscle disease although the role of succinylcholine in causing these side effects also remains unclear. [29]