The side lengths of a right triangle form a so-called Pythagorean triple. A triangle that is not a right triangle is sometimes called an oblique triangle. Special cases of the right triangle include the isosceles right triangle (middle figure) and 30-60-90 triangle (right figure).
The first pacemaker was implanted on 8th October 1958 in a 43 year old man called Arne Larsson with complete heart block and Stokes-Adams attacks. Technological innovations between 1973 and 1980 rendered obsolete the reliable pacemaker of 1970.
The first cardiac pacemaker was invented in the year 1950 by Canadian John Hopps. In the year 1958, Wilson Greatbatch invented the first implantable pacemaker. The internal pacemaker is a device that regulates the rhythm of the heart by using electrical impulses.he first cardiac pacemaker was invented in the year 1950 by Canadian John Hopps. In the year 1958, Wilson Greatbatch invented the first implantable pacemaker. The internal pacemaker is a device that regulates the rhythm of the heart by using electrical impulses.