Low Blood Pressure

What Is Low Blood Pressure?

Hypotension is the restorative term for low circulatory strain (under 90/60).

A blood pressure reading appears as two numbers. The first and higher of the two is a measure of systolic pressure, or the pressure in the arteries when the heart beats and fills them with blood. The second number measures diastolic pressure, or the pressure in the arteries when the heart rests between beats.

Optimal blood pressure is less than 120/80 (systolic/diastolic). In healthy people, low blood pressure without any symptoms is not usually a concern and does not need to be treated. But low blood pressure can be a sign of an underlying problem -- especially in the elderly -- where it may cause inadequate blood flow to the heart, brain, and other vital organs.

Chronic low blood pressure with no symptoms is almost never serious. But health problems can occur when blood pressure drops suddenly and the brain is deprived of an adequate blood supply. This can lead to dizziness or lightheadedness. Sudden drops in blood pressure most commonly occur in someone who's rising from a lying down or sitting position to standing. This kind of low blood pressure is known as postural hypotension or orthostatic hypotension. Another type of low blood pressure can occur when someone stands for a long period of time. This is called neurally mediated hypotension.

Postural hypotension is considered a failure of the cardiovascular system or nervous system to react appropriately to sudden changes. Normally, when you stand up, some blood pools in your lower extremities. Uncorrected, this would cause your blood pressure to fall. But your body normally compensates by sending messages to your heart to beat faster and to your blood vessels to constrict. This offsets the drop in blood pressure. If this does not happen, or happens too slowly, postural hypotension results.

The risk of both low and high blood pressure normally increases with age due in part to normal changes during aging. In addition, blood flow to the heart muscle and the brain declines with age, often as a result of plaque buildup in blood vessels. An estimated 10% to 20% of people over age 65 have postural hypotension.

The cause of low blood pressure isn't always clear. It may be associated with the following:

• Pregnancy
• Hormonal problems such as an underactive thyroid (hypothyroidism), diabetes, or low blood sugar (hypoglycemia)
• Some over-the-counter medications
• Some prescription medicines such as for high blood pressure, depression or Parkinson’s disease
• Heart failure
• Heart arrhythmias (abnormal heart rhythms)
• Widening, or dilation, of the blood vessels
• Heat exhaustion or heat stroke
• Liver disease

What Causes a Sudden Drop in Blood Pressure?

• Loss of blood from dying 
• Low body temperature 
• High body temperature 
• Heart muscle ailment bringing on heart disappointment 
• Sepsis, a serious blood contamination 
• Serious lack of hydration from retching, looseness of the bowels, or fever 
• A response to pharmaceutical or liquor 
• A serious unfavorably susceptible response, called hypersensitivity

Who Gets Postural Hypotension?

Postural hypotension, which is low circulatory strain when standing up all of a sudden, can transpire for an assortment of reasons, for example, drying out, absence of nourishment, or being excessively exhausted. It can likewise be affected by hereditary make-up, maturing, pharmaceutical, dietary and mental components, and intense triggers, for example, disease and hypersensitivity. 

Postural hypotension happens most oftentimes in individuals who are taking medications to control (hypertension). It can likewise be identified with pregnancy, compelling feelings, solidifying of the courses (atherosclerosis), or diabetes. The elderly are especially influenced, particularly the individuals who have hypertension or autonomic sensory system brokenness. 

Hypotension after suppers is a typical reason for discombobulation and falls in the wake of eating. This is most regular after extensive suppers containing a ton of starches. It's accepted to be brought about by blood pooling into the vessels of the stomach and digestion systems. 

A few medications are generally connected with postural hypotension. These medicines can be isolated into two noteworthy classes: 

• Drugs used to treat hypertension, for example, diuretics, beta-blockers, calcium-channel blockers, and angiotensin-changing over chemical (ACE) inhibitors 
• Drugs that have hypotension as a symptom, including nitrates, erectile brokenness solutions, drugs for Parkinson's infection, antipsychotics, neuroleptics, hostile to tension operators, narcotic hypnotics, and tricyclic antidepressants
• Parchedness and electrolyte misfortune, which might come about because of looseness of the bowels, regurgitating, inordinate blood misfortune amid feminine cycle, or different conditions 
• Age-related decrease in circulatory strain regulation, which might be intensified by certain wellbeing conditions or solutions 
• Certain sicknesses can likewise bring about postural hypotension. These include: 
• Focal sensory system issue, for example, Shy-Drager disorder or numerous framework decay 
• Nerve issues, for example, fringe neuropathy or autonomic neuropathy 
• Cardiovascular disarranges 
• Liquor abuse 
• Nourishing ailments