Purpose: The purpose of this study is to clearly classify the roles of Physician assistants and to identify obstacle factors and necessary factors for the operation of the system when they are performing the roles of Physician assistants. Methods: This is a descriptive research study to analyze the roles of Physician assistants and to understand the expected roles of Physician assistants according to each medical personnel (doctor, nurse, Physician assistants). Results: The obstacles to work are the lack of legal protection, and unclear work guidelines, and the matter necessary for the operation of the system is the legal protection. There were statistically significant differences in health collection ability, physical examination, drug response monitoring, and reporting in terms of the differences in role expectations considered by medical professionals regarding the roles of Physician assistants. Conclusion Physician assistants need to develop various educational programs and materials, cultivate the ability to perform Physician assistants, and develop an advisory role through effective problem-solving between departments and increase the quality and satisfaction of Nursing care.

Objective: Cerebral vasospasm and delayed cerebral ischemia (DCI) are considered complications after aneurysmal subarachnoid hemorrhage (aSAH). Several hypotheses involving platelet activation have been asserted in the pathophysiology of cerebral vasospasm and DCI. This study aimed to investigate the effect of dual antiplatelet treatment (DAPT) on symptomatic vasospasm and DCI in patients with aSAH. Methods: A retrospective study was conducted on patients with aSAH from 2009 to 2018. The patients are divided into 2 groups according to the treatment method such as simple or balloon-assisted coil embolization group (SB coiling), and stent-assisted coil embolization group. Patients treated by SB coiling without DAPT were classified as the control group. Patients who required dual antiplatelet treatment due to stent-assisted coil embolization were classified as DAPT group. The incidence of symptomatic vasospasm and DCI was compared between the two groups. Results: Of 743 patients with aSAH, 563 patients were treated with clipping, 115 patients treated with SB coiling, and 65 patients receive stent-assisted coiling. Among 115 patients underwent SB coiling, 14 patients were excluded by the exclusion criteria. Total number of control group (SB coiling) was 101, DAPT group (stent-assisted coiling) was 65. Depending on whether or not taking DAPT, the incidence of symptomatic vasospasm was lower in the DAPT group (p=0.010). DCI incidence was also lower in the DAPT group, which was statistically significant (p=0.029). Conclusions DAPT reduces the frequency of symptomatic vasospasm and DCI in patients with aSAH in our single-center study. To warranting this topic, further, larger prospective and randomized studies should be needed.