The global population aged over 65 years is growing by 9 million a year, and by the year 2025 there will be more than 800 million people above 65 years of age in the world [1]. The World Health Organization (WHO) estimated that approximately one among six people will suffer a stroke at a time in their life [2] According to WHO, around 17.5 million people died from cardiovascular diseases in 2012, representing 31% of overall global deaths. From these deaths, an estimate of 7.4 million was due to coronary heart diseases and 6.7 million were due to stroke [3].

A stroke is a rapidly developing clinical focal disorder of cerebral function through symptoms durable for twenty-four hours or longer and leading to death, with no obvious reason other than the vascular source [3]. The most common symptom after stroke is dysphagia in an approximately half of new onset stroke [4]. Dysphagia is disruption of the bolus flow through the mouth and pharynx. As the function of swallowing is the safe delivery of a food bolus into the stomach, then the immediate complication of dysphagia is food entering the airway [5]. Dysphagia as a deficiency of eating and drinking through any or all of the different phases of swallowing [6].

Dysphagia affects a vast number of acute stroke patients. An estimated 20% to 50% of patients who have suffered a stroke have identifiable signs and symptoms of dysphagia [7]. A higher percentage (30% to 67%) was reported in stroke patients [8]. Dysphagia interrupts half of acute stroke patients and carries three folds to seven folds amplified hazards of aspiration pneumonia [9]. Up to 35% of deaths that may occur after a stroke are due to pneumonia [10]. The frequency of dysphagia in patients who were classified as severe dysphagia was 52%, and 28% with a high risk of aspiration. At the hospital discharge, only 2.1% of patients still had severe dysphagia [11].

The literature search untile 2016. Additional studies were identified through the searches of literature reviews, as well as from the reference lists associated with these studies. The keywords were used in multiple combinations in order to conduct an extensive search of these databases. The keywords used were dysphagia; dysphagia screening nurse's competency; and stroke. These keywords were entered into multiple electronic databases including CINAHL, Medline, Science Direct, Pro Quest, Pub Med, and Wiley Online Library. The following are the inclusion criteria for the integrative research review:

1. A research-based study.
2. Quantitative, qualitative, mixed methods and systematic reviews.
3. Written in English language.
4. Focuses on nurses' screening of dysphagia among stroke patients.

The articles were obtained and reviewed based on the specific inclusion criteria established, then the authors restricted the searching strategy by selecting the full text only. The analysis of the methodological characteristics of the selected studies included the purpose, samples, study design, and the measurement. At the end of the literature search, 45 full-text articles were retrieved, the titles were screened for relevance and the abstracts were read carefully, twelve not relevant articles were removed. The remaining 33 papers were read in depth and considered to be reviewed to achieve the purpose of this study. After reviewing the titles, summaries, and fully reading the articles, 17 studies were chosen. Fig. (1) show PRISMA diagram for Literature Review.

The majority of the studies were published in 2010 through 2016. The type of all the selected studies were quantitative research except one which was a mixed method in single-group, pre- and post-study. Most of the selected studies were non-experimental quantitative descriptive studies (n = 8). Two studies were quasi-experimental and two were a literature review, while one study was a randomized clinical trial study. In addition, two study were implementation of project and one study was clinical evaluation. One article was a single-group, pre- and post-study with mixed methods.

Fig. (1). Cross section of E-TCS.

Two parts created the body of this literature review. The first part covers the literature on the training nurses in screening dysphagia among stroke patients and benefits of screening. The second part of the literature review covers nurses competency in terms of knowledge and skills of screening dysphagia among stroke patients. Table 1 demonstrates themes of the studies reviewed.

Patients with stroke are at risk of dysphagia because they often have decreased the level of consciousness and poorer cranial nerve function followed by facial and oropharyngeal muscle weakness [14, 28]. However, clinical signs and symptoms of dysphagia are not observable all the time and the existence of an intact gag reflex does not essentially rule out the opportunity of aspiration pneumonia [15]. The possibility of mortality was higher in patients with altered swallowing than in patients with no such alteration upon clinical evaluation [40]. Chang, et al. (2013) reviewed that the death certificates of patients who died with stroke were 5% due to aspiration pneumonia and 1% due to choking [41].

Dysphagia screening is a marginally invasive, pass or fail tool for quick identification of patients who need a formal evaluation of swallowing administered by a trained professional [15]. Numerous clinical tools have varying sensitivity and specificity and several dysphagia screenings are available for nurses to administer among stroke patients and validate against the instrumental assessment. Although numerous dysphagia screening tools are present, no one has high sensitivity and reliability or applied quickly with minimal training [10].

One of the main responsibilities of the registered nurses is screening dysphagia among stroke patients because they have better chances to contact with patients in clinical location and they must learn the accurate guidance of safe feeding of patients with dysphagia [37]. Additionally, nurses specifically trained in the acting screening dysphagia have a significant role in dropping adverse outcomes connected to dysphagia [4, 6, 34]. However, dysphagia screening by nurses does not shift assessment by the Speech Language Pathologists; instead, it improves the care provided to patients at risk allowing for early detection and intervention [2, 6].

Knowledge of swallowing disorders in terms of signs and symptoms is fundamental for nurses working in different hospital settings. A lack of knowledge about dysphagia can result in hazardous consequences and this can be fatal for the patient. Nurses conducted the swallowing screening test inconsistently and without a standard procedure, caused chiefly by the lack of knowledge and skills on dysphagia screening, and the absence of training programs [32]. Several researchers emphasis on nurses for training the dysphagia screening [30, 31, 33, 35, 38, 39].

Training is a process by which someone has acquired the skills that are needed for a profession. Teaching enhances any knowledge and skills regarding the specific competency to improve one's capability and performance in order to increase productivity [42]. The literature supports the need for screening of dysphagia because of frequent complications of post-stroke can be detected by nurses via applying the appropriate valid tool [26, 31, 33, 35]. There were medical, psychological, and economic benefits for screening dysphagia among stroke patients [6, 12, 18-20, 22, 26, 31, 35, 36].

The patient needs come to be more complicated and nurses should attain essential competencies to deliver high-quality care. Care of patients with dysphagia is still a challenge because of the need for proper management of care and an interdisciplinary approach involving the Speech Language Pathologists, nurses, and medical experts [20, 25]. To add more effects in the identification of dysphagia among stroke patients in order to decrease the consequence of dysphagia, nurses ought to assess their competency using the well-developed tool in identifying the level of expertise required by their anticipated role related to their job and should be trained to that level [43].

Competency defined as the capability to do something efficiently and successfully [44]. Likewise, competency preferred outcome from an integration of knowledge, skills, abilities, judgment, and performing successfully at an expected level of nursing education and professional development [45]. Although there is no universal definition of competency [46], registered nurses must continually reassess their competencies and identify needs for additional knowledge and skills. Measuring registered nurses competencies to determine if a nurse holds the ability to perform specific tasks on clinical skills, knowledge, education, and experience in the by competency assessment tools [47]. Accordingly, healthcare organizations are anticipated to assess and continue frequently registered nurses’ clinical competencies as quantity of work to achieve the top patient care.

In the acquisition and development of a skill, a nurse passes through five levels of proficiency: novice; advanced beginner; competent; proficient; and expert [48]. In 2006, an Inter-Professional Dysphagia Competence Framework [43] was comprehensively planned for the nurses and other health care professionals to provide more effectiveness in the documentation of people with swallowing dysfunction to provide a steady approach in training and educating them. There are five levels of the Inter-Professional Dysphagia Competence Framework and their competences (Awareness; Assistant dysphagia practitioner; Foundation dysphagia practitioner; Specialist dysphagia practitioner; and Expert/consultant dysphagia practitioner) started from those who needed awareness on the presenting signs and symptoms of dysphagia and those associated with health risks to demonstrate skilled procedures with higher theoretical knowledge establishment on research/best practice. Low competence on registered nurse results spread the morbidity and mortality among stroke patients [47].

Dysphagia screening is a key process in the care of patients with post-stroke. All studies agreed the benefit of screening dysphagia among stroke patients. However, there was currently no agreement regarding the best approach to dysphagia screening [8, 20]. Disagreement exists regarding what tool should be used for screening and who should administer the screening [20]. All studies addressed the benefits of training nurses in screening for dysphagia among stroke patients in this literature review. In addition, various studies have created different protocols for a nurse in order to conduct a dysphagia screening, but there was no one universally utilized dysphagia screening in the hospitals [20]. There are many screening methods, but all have limitations, especially when used with acutely ill patients [6].

Publications about screening dysphagia among stroke patients started before 17 years and the methods used on the instruments were questionnaires and observation of patient’s clinical signs and symptoms [49]. Most of the studies described registered nurse competency in terms of knowledge and skills by descriptive exploratory design with purposive sampling to describe and assess knowledge about the care of the patients with dysphagia with small sample size [30, 31, 35]. But little of them investigated the practice of nurses [37-39]. Minor studies used quazi-experimental [7, 18, 37] and Randomized clinical trial study [12]. Most of the researchers concluded that nurses do not have adequate knowledge and practice in different aspects of dysphagia and screening dysphagia nurses should assess their competency in terms of knowledge and skills in well-developed tool and different evaluation tools exist. Most of the studies used self administered structured questionnaire to evaluate knowledge, while another study evaluated practical knowledge by written narratives; nonparticipant observations and interviews; and patient chart review [39].

Competence in nursing is essential to provide safe and high quality care for stroke patients, hence registered nurses are at the forefront of recognizing and responding to deviations in patient condition which may be life- threatening. The outcomes of this review highlights the role of training in a clinical placement that may be an area of research to provide sufficient regular training for a registered nurse. Educational strategies that ease the development of nurses’ knowledge, skills, and competencies in managing patient are vital. Integration of theory and practice in nurse student's curricula is important for developing nurse competence.

The current review is unique and elicit for a new body of knowledge and evidence about screening dysphagia among stroke patients in the hospitals and inform health care providers and administrators of the importance of screening dysphagia prior to initiating the oral intake of fluids or food utilizing a simple valid reliable screening tool. In addition, this review may be a platform for future setup of policies and guidelines for the health care providers to screen dysphagia among stroke patients.

In stroke patients, dysphagia is frequent and present alarming symptom that needs urgent attention. Early screening of dysphagia is essential to prevent future health complications and should have a high priority in the health-care practices Nurses should be aware of the signs and symptoms of dysphagia to enable them recognized patients with dysphagia. Nurses, clinicians, and hospital administrators need to support teaching and training of nurses who take care of dysphagia stroke patients. Nurses need to develop their competencies on dysphagia screening based on evidence. Confirming competence in nursing practice should be a high priority for staff development departments in hospitals.