Low blood pressure:Anyblood pressurethat is below the normal expected for an individualina givenenvironment.Low blood pressureis also referred to as hypotension.
Low blood pressureis a relative term because thebloodpressure normally varies greatly with activity, age, medications, and underlying medical conditions.
Low blood pressure can result from conditions of the nervous system, conditions that do not begin in the nervous system, and drugs.
Neurologic conditions that can lead to low blood pressure include changing position from lying to morevertical(postural hypotension), stroke, shock, lightheadedness after urinating or defecating, Parkinson's disease,neuropathyand simply fright.
Nonneurologic可引起低血的条件pressure include bleeding, infections, dehydration, heart disease, adrenal insufficiency, pregnancy, prolonged bedrest,poisoning, toxic shock syndrome, and blood transfusion reactions.
Hypotensivedrugs include blood pressure drugs,diuretics(waterpills), heart medications (especiallycalciumantagonists-nifedipine/PROCARDIA,beta blockers-propranolol/INDERALand others),depressionmedications (such asamitriptyline/ELAVIL), andalcohol.
