The study was carried in Chemistry Department of University of Sciences and Entomology Department of National Institute of Malariology - Parasitology - Entomology during the period of 2001-2002. A manual syringe for SPME was made by using a fused silica fiber from optical cable, one of the end of the fiber is passed through the hole of a needle of 5mL medical syringe and is attached to a piston in a protective holder of 1mL medical syringe, and the other end is coated by liquid phase polyacrylate (the fiber end in a 0.1g/mL solution of polyacrylate in dichloromethane). Then the liquid sample to adsort analytes during 30-45 minutes. At the end, the 2 needle is inserted into the GC/ECD injector port is desorbed the analytes on to the column
Syringes ; Solid Phase Microextraction ; Pyrethrins

Background: Hypertension is a common disease in adults, also the leading cause of cardiovascular disease and premature death worldwide. The prevalence of hypertension has increased, especially in low- and middle-income countries. Therefore, hypertension screening is important to provide the basis and evidence for the development of timely intervention policies and programs. The objective of the “May Measurement Month” 2022 program is to investigate the prevalence of hypertension, drug treatment and blood pressure control in people in Thua Thien Hue province and to assess the risk factors surrounding hypertension. Subjects and Methods: This cross–sectional study collected data from volunteer adults (≥ 18 years old) in Thua Thien Hue province from 7/2022 to 8/2022. Sitting blood pressure had been measured in triplicate according to standardized specified methods of the International Society of Hypertension. Results: Average age 54.07 ± 18.17, there were 627 people (23.4%) with hypertension at the time of screening, 245 of which (39.1%) had never been diagnosed with hypertension before screening at the time. 724 people were on treatment with 1 or more types of drug, however, there were 337 people (46.5%) having their blood pressure not controlled. The statistics showed that 84.9% of volunteers were using at least 1 drug to treat hypertension. Related factors of hypertension are age, sex, overweight/obesity status, smoking, medical history of diabetes and medical history of COVID-19. The rate of subjects who had history of COVID-19 was 36.4%, including 31.6% of hypertension patients. Conclusion: The hypertension percentage of Thua Thien Hue population is still high and the rate of blood pressure control is still limited. There is a relationship between hypertension proportion and history of COVID-19. It is necessary to publish timely intervention measures to reduce the rate of hypertension and its risks to people.