High Blood Pressure

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Medical Author:

Benjamin Wedro, MD, FACEP, FAAEM

Benjamin Wedro, MD, FACEP, FAAEM

Dr. Ben Wedro practices emergency medicine at Gundersen Clinic, a regional trauma center in La Crosse, Wisconsin. His background includes undergraduate and medical studies at the University of Alberta, a Family Practice internship at Queen's University in Kingston, Ontario and residency training in Emergency Medicine at the University of Oklahoma Health Sciences Center.

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Medical Editor:

Melissa Conrad Stöppler, MD, Chief Medical Editor

Melissa Conrad Stöppler, MD, Chief Medical Editor

Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.

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• High Blood Pressure Overview
• High Blood Pressure Causes
• High Blood Pressure Symptoms
• When to Seek Medical Care
• High Blood Pressure Diagnosis
• High Blood Pressure Treatment
• Self-Care at Home
• Medical Treatment
• High Blood Pressure Medications
• Surgery
• Other Therapy
• Follow-up
• High Blood Pressure Prevention
• High Blood Pressure Outlook
• Pictures
• Synonyms and Keywords
• Authors and Editors
• Read more on High Blood Pressure from Healthwise
• Salt FAQs

High Blood Pressure Overview

The heart pumps blood into the arteries with enough force to push blood to the far reaches of each organ from the top of the head to the bottom of the feet. Blood pressure can be defined as the pressure of blood on the walls of the arteries as it circulates through the body. Blood pressure is highest as its leaves the heart through the aorta and gradually decreases as it enters smaller and smaller blood vessels (arteries, arterioles, and capillaries). Blood returns in the veins leading to the heart, aided by gravity and muscle contraction.

Hypertension is the medical term for high blood pressure. It is known as the "silent killer" since it has no initial symptoms but can lead to long-term disease and complications..

• Many people have high blood pressure and don't know it.
  
  
• Important complications of uncontrolled or poorly treated high blood pressure include heart attack, congestive heart failure, stroke, kidney failure, peripheral artery disease, and aortic aneurysms (weakening of the wall of the aorta, leading to widening or ballooning of the aorta).
  
  
• Public awareness of these dangers has increased. High blood pressure has become the second most common reason for medical office visits in the United States.

How is blood pressure measured?

Blood pressure is measured with a blood pressure cuff and recorded as two numbers, for example, 120/80 mm Hg (millimeters of mercury). Blood pressure measurements are usually taken at the upper arm over the brachial artery.

• The top, larger number is called the systolic pressure. This measures the pressure generated when the heart contracts (pumps). It reflects the pressure of the blood against arterial walls.
  
  
• The bottom, smaller number is called the diastolic pressure. This reflects the pressure in the arteries while the heart is filling and resting between heartbeats.

The American Heart Association has recommended guidelines to define normal and high blood pressure.

• Normal blood pressure less than 120/80
  
  
• Pre-hypertension 120-139/ 80-89
  
  
• High blood pressure (stage 1) 140-159/90-99
  
  
• High blood pressure (stage 2) higher than 160/100

As many as 60 million Americans have high blood pressure.

• Uncontrolled high blood pressure may be responsible for many cases of death and disability resulting from heart attack, stroke, and kidney failure.
  
  
• According to research studies, the risk of dying of a heart attack is directly linked to high blood pressure, particularly systolic hypertension. The higher your blood pressure, the higher the risk. Maintaining lifelong control of hypertension decreases the future risk of complications such as heart attack and stroke.