Nursing is a combination of science and art (
1). Nurses are the largest group of healthcare systems able to place effects on the quality of the health care provided (
2,
3). One of the methods enabling the nurses to train to upgrade their nursing services and reach the welfare of the patients is telenursing (
4). Telenursing is considered a part of telemedicine, and based on the definition, the nurses meeting the health needs of the patients is by information and communications technology (ICT) (
5). Telenursing presents a device for providing continuous care in patients with chronic conditions. Thus, the patients can receive care-giving information without long trips in high quality and low travel cost (
6). Telenursing is an ICT for providing nursing care (
7), which can be provided by a variety of applications, such as the use of monitoring systems, the Internet, video, telephone, e-mail, and video images (
5). Here, the most basic form of electronic healthcare communication can be an important and valuable aspect in patient care programs (
8). The telephone is a simple device available to the majority of the population and is excessively used (
9). Nowadays, more than 36 million Americans use telenursing. They argue that about 70% of nursing care and even medical care is possible through telecommunications technology such as the telephone and the Internet (
10). The Canadian government considers access to telenursing as necessary for the whole population of the country due to the fact that it defines telenursing as a safe way in which the patient can communicate overnight and receive counseling at the lowest cost and only with telecommunications devices (
11). Telenursing reduces unnecessary traffic and improves the quality of nursing activities (
12). The composition of the world population is changing with the advances in medical knowledge and amazing technologies of the today's world accelerating this trend, thus, increasing the life expectancy as one of the consequences of this advance and rapid development, which has increased the number of the elderly. In the next 40 years, the population over 65 will double in the world, of which 52% will be in Asian countries and 40% in the advanced countries (
13). Increase in life expectancy as well as reducing fertility in the world has led to an aging phenomenon in the world and in Iran. According to the World Health Organization (WHO) statistics in 2000, about 600 million elderly people lived in the world, reaching 2.1 billion in 2025 and reaching 2 billion in 2050. According to the 2011 census, more than 8.2% of the population of Iran is comprised of people aged 60 and over (
14). Studies show that about 60% of health care costs, 35% of hospital clearance, and 47% of hospital admissions are for the elderly (
15). Currently, the number of deaths due to chronic and aging diseases is increasing. The cost and duration of treatment for chronic diseases was 20 to 30 times more than the acute one, thus, telenursing can be the most cost effective caring method (
16). Telenursing is used in different populations including the chronic diseases, aging, children and rural population, sanitation and emergency centers, as well as specialized clinics (
17). Increase in the scientific knowledge of the nurses in telenursing enables them to help their patients to target their own self-care and function level (
18). Despite the important of telenursing in the care of chronic disease, there is no study in this area in Guilan, which is the eldest province. As chronic diseases are increasing particularly in the elderly and since the use of telecommunication technologies, especially the telephone, to track and care for chronic diseases is cost-effective; this study was aimed to introduce telenursing as a method of nursing care and its effect on the control of chronic diseases.