Naming difficulties may be rank ordered along a continuum. Items are rank ordered in terms of their ability to be named, which is correlated with their frequency. This type of picture-naming test is also useful in the examination of children with learning disabilities and the evaluation of brain-injured adults.
The Jarvik-7 heart was developed by American scientist Robert Jarvik and his mentor, Willem Kolff. In 1982, Seattle dentist Dr. Barney Clark was the first person implanted with the Jarvik-7, the first artificial heart intended to last a lifetime.
In Sweden in the year 1958 also the first implanted pacemaker was used by the Swedish surgeon Ãke Ã¥ke ((senning-1915). 2000 senning used the device that was invented by The sweden Inventor Rune (elmqvistâ1906). 1996n the year 1932, Albert Hyman (1893-1972) the American cardiologist invented a device that was using a spring-wound motor that works by hand. Hyman was the first to use the term artificial pacemaker.