Cardiac conditions may be disparate, functional, or organic, with varying consequences. The lesions may involve the coronary system (the heart vessels), the endocardium (the internal membrane of the heart), the myocardium (the cardiac muscle), and pericardium (the serous envelope of the cardiac muscle). These lesions, or simple functional disorders, may induce symptoms such as palpitations, cardiac rhythm disorders, cardiac insufficiency, precordial pain, angina pectoris, and fainting fits. Injuries may result in heart valve ruptures or heart wounds.
Approximately 6% of all workers suffer from a heart condition, though the incidence is higher among elderly employees. Living and working conditions (hours of work, speed of work, nutrition, smoking) are factors at least as important in the aetiology of heart disease as physical work itself. Coronary diseases are found more frequently amongst sedentary workers or persons with heavy responsibility, such as manager's or executive's coronary disease.
The Encyclopedia of World Problems and Human Potential is a collaboration between UIA and Mankind 2000, started in 1972. It is the result of an ambitious effort to collect and present information on the problems with which humanity is confronted, as well as the challenges such problems pose to concept formation, values and development strategies. Problems included are those identified in international periodicals but especially in the documents of some 60,000 international non-profit organizations, profiled in the Yearbook of International Organizations.
The Encyclopedia includes problems which such groups choose to perceive and act upon, whether or not their existence is denied by others claiming greater expertise. Indeed such claims and counter-claims figure in many of the problem descriptions in order to reflect the often paralyzing dynamics of international debate. In the light of the interdependence demonstrated among world problems in every sector, emphasis is placed on the need for approaches which are sufficiently complex to encompass the factions, conflicts and rival worldviews that undermine collective initiative towards a promising future.
Non-profit, apolitical, independent, and non-governmental in nature, the UIA has been a pioneer in the research, monitoring and provision of information on international organizations, international associations and their global challenges since 1907.