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The LAD gives off two types of branches: septals and diagonals. Septals originate from the LAD at 90 degrees to the surface of the heart, perforating and supplying the anterior 2/3 of the interventricular septum. Diagonals run along the surface of the heart and supply the lateral wall of the left ventricle and the anterolateral papillary muscle.
Normally, the blockage should affect approximately 70% of the artery for symptoms to become noticeable. [3] Symptoms can be less severe during gradual narrowing, as this allows time for the widening of existing vessels and the formation of new ones ( collateral vessels ), allowing blood to still reach the area.
It affects about 2% of people who are over 65 years of age. [1] Estimated rates were not known in most of the developing world as of 2014. [5] In those who have symptoms, without repair the chance of death at five years is about 50% and at 10 years is about 90%. [1] Aortic stenosis was first described by French physician Lazare Rivière in 1663 ...
Angina may start to occur when the vessel is 70% occluded. [9] Lack of oxygen may also result in a myocardial infarction (heart attack). [26] CAD can be contracted over time. Risk factors include a family history of CAD, smoking, high blood pressure, diabetes, obesity, inactive lifestyle, mental stress and high cholesterol.
Myasthenia gravis most commonly occurs in women under the age of 40 and in men over the age of 60. [1] [5] [14] It is uncommon in children. [1] With treatment, most live to an average life expectancy. [1] The word is from the Greek mys, "muscle" and asthenia "weakness", and the Latin gravis, "serious". [15]
Atherosclerosis generally starts when a person is young and worsens with age. Women are 78% at higher risk level than men [2] Almost all people are affected to some degree by the age of 65. [7] It is the number one cause of death and disability in developed countries.
Symptoms include overactive bladder, decreased stream of urine, hesitancy urinating, and incomplete emptying of the bladder. [19] [20] By age 40, 10% of men will have signs of BPH and by age 60, this percentage increases by 5 fold. Men over the age of 80 have over a 90% chance of developing BPH and almost 80% of men will develop BPH in their ...
Most people who develop ALS are between the ages of 40 and 70, with an average age of 55 at the time of diagnosis. [65] ALS is 20% more common in men than women, [ 65 ] but this difference in sex distribution is no longer present in patients with onset after age 70.