女孩被诊断为肺炎,白细胞却不高,肺炎不是细菌感染?
近日,上初二的小韩“感冒了”,咳嗽,咽痛,乏力,发热,于家中休息,吃感冒药,三四天仍无缓解,且有加重的迹象,体温最高时达39℃,而且咳嗽也越来越重,家人感觉病情比较难控制,直接到了当地市医院就诊,医生怀疑肺炎,门诊完善了胸片、抽血化验等检查,但拿到血常规结果后,小韩的爸爸却很惊讶:血常规结果中的白细胞并不高,肺炎,白细胞不高?难道化验结果出错了,还是诊断错误?
这里需要给大家科普一下,虽然肺炎最常见的致病菌是肺炎链球菌,占肺炎的一半还多,但是也有一部分肺炎不是细菌感染,而是支原体、衣原体、或者是病毒感染,这三种病原体引起的肺炎,血常规白细胞都不升高或者只是轻度升高,这其中发病率最高的非细菌性肺炎还是支原体肺炎,约占到所有肺炎的10%左右,冬季可能所占的比例更高。
支原体是介于细菌和病毒之间的能独立生存的小微生物,支原体肺炎最常见的传染途径也是通过呼吸道传播,而且支原体肺炎的易感人群是儿童及青少年。支原体肺炎有潜伏期,一般为2~3周,很多患者在发病前有去野外或者异地游玩史,至于症状和肺炎球菌肺炎有很多相似的地方,高热,头痛,乏力,咳嗽等,但也有其自身的特点,就是全身症状较轻,但呼吸道症状较重,尤其是咳嗽一般都很剧烈(较细菌性肺炎更剧烈),且多为阵发性的刺激性的呛咳,但痰却不多,痰液一般也无血丝,胸部X线一般是节段性的侵润影,以下肺野多见。
肺炎链球菌肺炎治疗首选是青霉素,现在应用的更多是头孢类,头孢哌酮、曲松等,严重者应用万古霉素。但支原体肺炎是自限性疾病,对症支持治疗,一般持续两周左右会慢慢缓解痊愈,为了缩短病程,现在一般也都行药物治疗,但青霉素类及头孢类对支原体肺炎的治疗却是完全无效的,药物首选为阿奇霉素,罗红霉素等大环内酯类药物。
小韩所患肺炎,医生结合小韩同学咳嗽剧烈,痰少等症状及胸片表现医生考虑即为支原体肺炎,对症治疗后症状慢慢缓解,所以,大家不要再错误的认为肺炎就一定是细菌感染,白细胞增高。
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