It represents the time from the end of ventricular depolarization to the start of ventricular repolarization. ST elevation may indicate myocardial infarction or pericarditis. ST depression may indicate ischaemia.
Marijuana has been illegal for less than 1% of the time that itâs been in use. Its known uses go back further than 7,000 B.C. and it was legal as recently as when Ronald Reagan was a boy.The marijuana (hemp) plant, of course, has an incredible number of uses.arijuana has been illegal for less than 1% of the time that itâs been in use. Its known uses go back further than 7,000 B.C. and it was legal as recently as when Ronald Reagan was a boy.
Cannabis, or marijuana, is the most commonly used illegal drug. It comes from the Cannabis sativa plant. It can be smoked or eaten, and comes in a variety of forms, such as dried plant leaves and flowers (âheadsâ), a crumbly, light-brown or dark-brown resinous material called âhashâ, or a very potent oil called âhash oilâ.