Pediatrics is defined as the science of a healthy and sick child from birth to end of adolescence. Diseases of the cardiovascular system are the leading causes of mortality in adults, with frequent onset in childhood. The cardiologic examination starts with anamnesis in a pleasant atmosphere, refined space, enough time and patience, detailed measurements, and preferably a noncrying child. Anamnesis, regardless of the development of diagnostic procedures, still constitutes the basis of every clinical examination. The basic characteristics of pediatric cardiac anamnesis are comprehensiveness, that is, details, clarity, concurrency, and chronology. Proper and conscientiously taken anamnesis with a thorough clinical examination of a sick child is a solid protection against dehumanizing the relationship between a physician and patient. Pediatric cardiac anamnesis can be variable, completely negative, but very rich. Anamnesis should, first of all, clarify whether only a child is sick or it is perceived like that be his or her environment. Preschool and school-age children are normally attending anamnesis. High-quality, comprehensive medical history can keep the patient at one level of health care, with a strict focus primarily on the diagnostic processes, reduce crowds in specialist and subspecialist institutions, and make economic savings. A large number of patients in specialist and subspecialist clinics can be reduced by proper screening and by developing primary health-care system (from the local health-care center). Taking patient's medical history with thoroughness has a strong educative character for young doctors at the beginning of their careers.

Why did I recall the details about public health aspects of global population and well-being in the 21^st century regarding the determinants of health? Most of all because today, at the end of 2017, we are talking about the same principles from the “Declaration on Primary Health Care” from 1978, and the same goals as those in “Health for all” which are still current or perhaps even more current than when they were published for the first time in scientific and professional literature. This is a notorious fact, even though we are talking about “Global Health” and its determinants, in all countries of the world, regardless of their social wealth, and all existing resources, especially those, intended to organize health care. In the field of practice, public health has advanced in knowledge and methodology. Biomedical scientists have identified many causes of infectious diseases and developed methods to put them under control. Epidemiologists have identified risk factors that favor many chronic illnesses and information that can be used to reduce the risk of disease. Efforts to cleanse the environment have resulted in air and water that are far safer than half a century ago. Intensive educational efforts have convinced the health-care organizers to improve their health behavior that is to quit tobacco use, and a combination of drinking and driving. The ability to assess the populations' health behaviors and assess the share of health interventions has also significantly improved the availability of health-care databases and computer software capable of analyzing them. However, much of the targets from the World Health Organization declarations are not improved or in some countries provided by official institutions responsible for public health activities.

Substance abuse and its consequences are major health hazards in the world. Opium addiction is a common form of substance abuse in Iran. Adulteration of illegal substances in the process of production and distribution of the drug in black market with many types of materials have been reported. One of the main goals of the adulteration of illegal substances is cutting of the substance for deal and increase of the weight for more benefit. However, adding of adulterating agents to illegal drugs could be considered as a cause of nonspecific and rare toxicity during substance abuse. Although the presence of lead in street-level heroin, marijuana, and amphetamines has been reported from some countries previously, recently, several reports suggested lead poisoning in Iranian opium addicts. Adulteration of opium with lead is a new source of lead poisoning in Iran in which the opium abuse is frequent and it could be a new health problem in the future. In this regard, evaluation of blood lead level would be important for early diagnosis of lead poisoning in opium addicts.