An estimated 33% of persons with myocardial infarction in the United States do not present with chest pain, and carry a significantly higher mortality as a result of delayed treatment. Physical examination
Careful medical history and physical examination is essential in separating dangerous from trivial causes of disease, and the management of chest pain may be done on specialized units (termed medical assessment units) to concentrate the investigations. Occasionally, invisible medical signs will direct the diagnosis towards particular causes, such as Levines sign in cardiac ischemia. However, in the case of acute coronary syndrome, a third heart sound, diaphoresis, and hypotension are the most strongly associated physical exam findings. However these signs are limited in their prognostic and diagnostic value. Other physical exam findings suggestive of cardiac chest pain may include hypertension, tachycardia, bradycardia, and new heart murmurs. Chest pain that is reproducible during the physical exam with contact of the chest wall is more indicative of non-cardiac chest pain, but still cannot completely rule out acute coronary syndrome. For this reason, in general, additional tests are required to establish the diagnosis. In the emergency department the typical approach to chest pain involves ruling out the most dangerous causes: heart attack, pulmonary embolism, thoracic aortic dissection, esophageal rupture, tension pneumothorax, and cardiac tamponade. By elimination or confirmation of the most serious causes, a diagnosis of the origin of the pain may be made. Often, no definite cause will be found and reassurance is then provided.
In Thailand, amphetamines are classified as Type 1 Narcotics. In the United Kingdom, amphetamines are regarded as Class B drugs. The maximum penalty for unauthorized possession is five years in prison and an unlimited fine. The maximum penalty for illegal supply is 14 years in prison and an unlimited fine. In the United States, amphetamine is a Schedule II prescription drug, classified as a CNS stimulant. Internationally, amphetamine is in Schedule II of the Convention on Psychotropic Substances. See also
Dextroamphetamine
Levoamphetamine
Lisdexamfetamine
Methylphenidate

Explanatory notes
Image legend

Reference notes
References
External links
"Amphetamine". Drug Information Portal. U.S. National Library of Medicine. "Amphetamine sulfate". Drug Information Portal. U.S. National Library of Medicine. "Amphetamine aspartate". Drug Information Portal. U.S. National Library of Medicine. "Dextroamphetamine saccharate". Drug Information Portal. U.S. National Library of Medicine. "Amphetamine". MedlinePlus.