Card Lauren, Lofland Denene
Armstrong Atlantic State University, Department of Medical Technology, 11935 Abercorn St., Savannah, GA, USA.
Clin Lab Sci. 2012 Summer;25(3):130-4.
The incidence of fungal endocarditis is increasing. While the pathogenic mechanisms are not fully understood, infection is associated with underlying heart disease and is most often attributable to Candida species. Candidal endocarditis complications include heart damage, inflammation, and emboli with resulting ischemia and tissue death. Candidal endocarditis is difficult to diagnose as blood cultures are often negative. Treatment includes surgical intervention and antifungal therapy. This case study describes a 41-year-old female complaining of acute onset of pain with numbness and tingling in both lower extremities. Prior history was significant for mycotic valve aneurysm and replacement secondary to culture-negative endocarditis. Evidence of limb-threatening ischemia led to a bilateral thrombectomy. During the thrombectomy white debris, later identified as Candida albicans, was encountered. A transesophogeal echocardiogram revealed a pedunculated mass which was determined to be the source of infection. The patient was placed on micafungin and voriconazole and discharged with a diagnosis of C. albicans fungal infection with descending aorta fungal mass. This case study illustrates an unusual presentation of candidal endocarditis with discussion of disease epidemiology, pathogenesis, diagnosis, and treatment.
真菌性心内膜炎的发病率正在上升。虽然其致病机制尚未完全明确,但感染与潜在的心脏病有关,且最常由念珠菌属引起。念珠菌性心内膜炎的并发症包括心脏损害、炎症以及栓子形成,进而导致局部缺血和组织坏死。念珠菌性心内膜炎难以诊断,因为血培养往往呈阴性。治疗方法包括手术干预和抗真菌治疗。本病例研究描述了一名41岁女性,她主诉双下肢突发疼痛并伴有麻木和刺痛感。既往病史显示其曾患霉菌性瓣膜瘤,并因血培养阴性的心内膜炎接受了瓣膜置换术。肢体出现危及生命的缺血迹象,遂进行了双侧血栓切除术。在血栓切除术中发现了白色碎屑,后来鉴定为白色念珠菌。经食管超声心动图显示有一个带蒂肿块,确定为感染源。该患者接受了米卡芬净和伏立康唑治疗,出院诊断为白色念珠菌真菌感染伴降主动脉真菌肿块。本病例研究阐述了念珠菌性心内膜炎的一种不寻常表现,并对该疾病的流行病学、发病机制、诊断和治疗进行了讨论。