疫苗注射前應否抽吸注射器

【明報專訊】2021年8月23日

年輕人接種新冠疫苗後出現心肌炎，專家稱比例為每10萬人中有10人，大部分病情輕微。目前科興及復必泰疫苗均採用肌肉注射，港大專家袁國勇團隊以小鼠研究，發現以靜脈注射復必泰的小鼠，心包出現明顯白斑；而肌肉注射的小鼠沒上述情况。團隊稱現時注射前毋須先抽吸注射器，或令疫苗意外注射入靜脈，引發心肌炎或心包炎，建議注射前應抽吸注射器檢視，以確保針頭不會插入靜脈。

Needle aspiration is the process of pulling back on the syringe plunger prior to injection. Its purported (據稱的) importance is to prevent accidental entry of the needle into a blood vessel, but there is no scientific evidence to support its need. The most recent guidelines published by the American Academy of Pediatrics recommend that aspiration prior to intramuscular vaccination may not be necessary, while the Canadian guidelines continue to recommend aspiration. It is not surprising therefore that both techniques are currently being used by vaccinators.

Ipp M, Sam J, Parkin PC. Needle Aspiration and Intramuscular Vaccination. Arch Pediatr Adolesc Med. 2006;160(4):451. doi:10.1001/archpedi.160.4.451-a