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.
* Pulse Generator â contains the circuitry and battery that generate the electrical signal. The battery can last from 6 to 15 years, depending on the type of pacemaker and how much you use it. * Leads â the wires that carry the electrical signal from the pulse generator to the heart.