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To understand how high levels of thyroxine can be toxic and lead to thyrotoxic myopathy physiologically, consider basic neuromuscular junction function. Under normal circumstances, muscle contraction occurs when electrical impulses travel down descending axons from the brain or spinal cord towards the neuromuscular junction.
Hyperthyroidism has unique effects in children on growth and pubertal development, e.g. causing epiphyseal maturation. In growing children, accelerated bone growth from hyperthyroidism can increase osteogenesis in the short term, but generally results in short-stature adults compared with the predicted heights. Pubertal development tends to be ...
Another effect of hyperthyroidism is bone loss from osteoporosis, caused by an increased excretion of calcium and phosphorus in the urine and stool. The effects can be minimized if the hyperthyroidism is treated early. Thyrotoxicosis can also augment calcium levels in the blood by as much as 25%. This can cause stomach upset, excessive ...
Most common causes of hyperthyroidism by age. [23] There are several causes of hyperthyroidism. Most often, the entire gland is overproducing thyroid hormone. Less commonly, a single nodule is responsible for the excess hormone secretion, called a "hot" nodule. Thyroiditis (inflammation of the thyroid) can also cause hyperthyroidism. [24]
The hormone produced by the thyroid gland has big impact on bone density, blood calcium levee. [4] Abnormalities of the thyroid gland impact bone disease such as osteoporosis, a condition that is common in women but men can be diagnosed with this silent disease as well as it mainly affects elderly individual. [citation needed]
The leading cause of hypothyroidism is Hashimoto’s disease (also known as Hashimoto’s thyroiditis, chronic autoimmune thyroiditis or lymphocytic thyroiditis), per Cleveland Clinic.
Iodine deficiency is the most common cause of hypothyroidism worldwide, [53] and the autoimmune disease Hashimoto's thyroiditis is the most common cause in the developed world. [54] Other causes include congenital abnormalities, diseases causing transient inflammation, surgical removal or radioablation of the thyroid, the drugs amiodarone and ...
The abnormality in the channel is thought to lead to shifts of potassium into cells, under conditions of high thyroxine (thyroid hormone) levels, usually with an additional precipitant. Treatment of the low levels of potassium in the blood, followed by correction of the hyperthyroidism, leads to complete resolution of the attacks.