● Errors in clinical care processes account for a significant percentage of complaints, injuries, and even deaths.
● The Healthcare Failure Modes and Effects Analysis (HFMEA) is validfor detecting human errors in clinical care processes.
● By the HFMEA method, we take advantage of the available resources for implementing corrective and preventive measures.

Plain Language Summary 
Errors in clinical care processes highly impact treatment-related problems, such as decreased patient safety, service quality complaints, physical injuries, and death. Accurate identification of clinical care processes and detection of failures and analysis of the effects of these failures and executing corrective measures can reduce the incidence of medical errors of service providers and their related issues. Given the importance of emergency services and the nature of clinical care processes, this study aimed to fully identify the processes, tasks, sub-tasks, and possible error modes in service delivery and their effects in the emergency department. In the risk assessment phase of detected errors, the three indices of occurrence, severity, and detection were scored by experts, and through focus group discussions,the errors with a risk priority number ˃216 were considered with risk priority. The highest risk priority scores in the respiratory system care category were related to the lack of suctioning and attention to oxygenation. Controlling the risks associated with clinical care in the emergency department plays a crucial role in reducing treatment costs, dissatisfaction, and complaints related to medical errors.