Objective: Vasovagal symptoms for sinus bradycardia are associated with hypotension in spinal anesthesia or immediately after it without the presence of high levels of anesthetic. Imbalance between sympathetic and parasympathetic control of the heart rate can be the cause of this syndrome. Aim of this study, the incidence of vasovagal reflex and its influencing factors in patients undergoing spinal anesthesia were studied.
Methods:In this descriptive epidemiological study, 284 patients who were candidates for surgery, under spinal anesthesia which was performed after obtaining written consent. Our study tool was a questionnaire that includes variables such as age, sex, and body mass index, the type of surgery, the anesthesia, fasting time, the positions immediately after spinal anesthesia, ASA class and whether elective or emergency, respectively. Heart and blood pressure were monitored in spinal anesthesia patients. Symptoms of bradycardia and hypotension with loss of consciousness, without anesthesia level above the T10 positively were recorded and the data collected were analyzed with SPSS software.
Results:The incidence of vasovagal response in our study population was 4%. In our study between age, sex, BMI, ASA class, anesthesia level S1-S5 and having a history of vasovagal reflex and reflexes shows a significant differences (P<0.05). On the contrary, the type of surgery, duration of fasting before surgery, the patient and the type of positions being elective or emergency surgery, showed that there was no significant relationship (P<0.05).
Conclusion:The incidence of vasovagal response in younger people, male as well as people who have a higher BMI is higher. The rate of vasovagal response in patients who have an underlying disease is more. To prevent vasovagal response, measures such as proper hydration before anesthesia, patient monitoring and knowing the history of previous attacks is frequently recommended.