Font Size
A
A
A

Low Blood Pressure (cont.)

Heart

The heart is an electrical pump. Problems with either the pump or the electricity can cause problems with low blood pressure.

  • If the heart beats too quickly, blood pressure may fall because there isn't enough time for the heart to refill in between each beat (diastole). If the heart beats too slowly, there may be too much time spent in diastole when blood is not flowing.
  • If the heart muscle has been damaged or irritated, there may not be enough pumping force to maintain blood pressure. In heart attack (myocardial infarction), enough heart muscle may be stunned so that the heart is too weak to pump effectively.
  • The valves of the heart allow blood to flow in only one direction. If a valve fails, blood can regurgitate backwards, minimizing the amount that will flow out to the body. If a valve becomes narrowed (stenotic), then blood flow may be decreased. Both situations may cause hypotension.
Medically Reviewed by a Doctor on 5/21/2014

Must Read Articles Related to Low Blood Pressure

Fainting
Fainting Fainting or syncope, is a temporary loss of consciousness. Causes of fainting include vasovagal, situational, postural, cardiac, neurologic, and psychogenic. Tr...learn more >>
Severe Allergic Reaction (Anaphylactic Shock)
Severe Allergic Reaction (Anaphylactic Shock) Anaphylaxis is a severe allergic reaction that occurs rapidly and causes a life-threatening response involving the whole body. Because the reaction is really an...learn more >>

Patient Comments & Reviews

The eMedicineHealth doctors ask about Low Blood Pressure:

Low Blood Pressure - Treatment

What was the treatment for your low blood pressure?

Low Blood Pressure - Causes

What caused your blood pressure to be abnormally low?

Low Blood Pressure - Symptoms

Which low blood pressure symptoms (dizziness, lightheadedness, fainting) do you find most troubling?




Read What Your Physician is Reading on Medscape

Shock, Distributive »

Shock is defined as a clinical syndrome due to inadequate tissue perfusion that results in end-organ dysfunction.

Read More on Medscape Reference »


Medical Dictionary