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[3] [4] Discovered in 1910, histamine has been considered a local hormone because it's produced without involvement of the classic endocrine glands; however, in recent years, histamine has been recognized as a central neurotransmitter. [5] Histamine is involved in the inflammatory response and has a central role as a mediator of itching. [6]
Blood pressure rises with age in childhood and, in children, hypertension is defined as an average systolic or diastolic blood pressure on three or more occasions equal or higher than the 95th percentile appropriate for the sex, age and height of the child.
In adults in most societies, systolic blood pressure tends to rise from early adulthood onward, up to at least age 70; [32] [33] diastolic pressure tends to begin to rise at the same time but start to fall earlier in mid-life, approximately age 55. [33] Mean blood pressure rises from early adulthood, plateauing in mid-life, while pulse pressure ...
"Your blood pressure is supposed to be under 140 over 90, optimally closer to 120 over 80."
For most people, recommendations are to reduce blood pressure to less than or equal to somewhere between 140/90 mmHg and 160/100 mmHg. [2] In general, for people with elevated blood pressure, attempting to achieve lower levels of blood pressure than the recommended 140/90 mmHg will create more harm than benefits, [3] in particular for older people. [4]
One of the factors believed to cause histamine intolerance is an imbalance between uptake of histamine through the diet and a diminished capacity to metabolize ingested histamine, leading to an increased blood concentration of the amines which may potentially cause adverse effects. The primary cause of histamine intolerance is considered by ...
A minimum systolic value can be roughly estimated by palpation, most often used in emergency situations, but should be used with caution. [10] It has been estimated that, using 50% percentiles, carotid, femoral and radial pulses are present in patients with a systolic blood pressure > 70 mmHg, carotid and femoral pulses alone in patients with systolic blood pressure of > 50 mmHg, and only a ...
In adults a systolic blood pressure of less than 90 mmHg is often used. [3] During an attack, blood tests for tryptase or histamine (released from mast cells) might be useful in diagnosing anaphylaxis due to insect stings or medications. However these tests are of limited use if the cause is food or if the person has a normal blood pressure, [3 ...