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February 7, 2012
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Aspirin Poisoning

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Aspirin Poisoning Overview

Aspirin is a trade name for acetylsalicylic acid, a common pain reliever (also called an analgesic). The earliest known uses of the drug can be traced back to the Greek physician Hippocrates in the fifth century BC. He used powder extracted from the bark of willows to treat pain and reduce fever.

  • Salicin, the parent of the salicylate drug family, was successfully isolated from willow bark in 1829. Sodium salicylate, a predecessor to aspirin, was developed, along with salicylic acid, as a pain reliever in 1875.
  • Sodium salicylate was not often popular though, because it irritated the stomach. However, in 1897, Felix Hoffman changed the face of medicine forever. Hoffman was a German chemist working for Bayer. He had been using the common pain reliever of the time, sodium salicylate, to treat his father's arthritis. The sodium salicylate caused his father the same stomach trouble it caused other people, so Hoffman attempted to create a less acidic salicylate formula. His work led to the synthesis of acetylsalicylic acid, or ASA. This soon became the pain reliever of choice for doctors around the globe.
  • In the 1970s, British pharmacologist John Vane, PhD, began studying how aspirin works to relieve pain and reduce fever. Vane and his colleagues found that aspirin inhibits the release of a hormonelike substance called prostaglandin. This chemical helps regulate blood vessel elasticity and changes the functioning of blood platelets. Thus aspirin can affect blood clotting and ease inflammation.

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Aspirin Poisoning

Low Blood Pressure Overview

Low blood pressure is a difficult clinical finding for a healthcare provider to address. While high blood pressure is known as the "silent killer," because it is associated with few acute symptoms, hypotension (hypo=low + tension=pressure) may be normal for a patient if it is without symptoms, but can be of great importance if it is associated with abnormal body function. Sometimes low is good, a goal to be achieved in keeping blood pressure under control. Sometimes low is bad because there is not enough pressure to provide blood flow to the organs of the body.

Blood pressure readings have two parts and are expressed as a ratio:

  • "Normal" blood pressure, for example is 120/80 (120 over 80) and measures the pressure within the arteries of the body.

  • Systolic pressure, the upper number, measures the pressure within the arteries when the heart is contracting (systo...

Read the Low Blood Pressure article »


Read What Your Physician is Reading on Medscape

Toxicity, Salicylate »

The use of salicylates dates back 2500 years to when Hippocrates recommended the use of willow bark to relieve the pain of childbirth.

Read More on Medscape Reference »

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