Zipursky Jonathan Samuel, Alhashemi Ahmad, Juurlink David
Department of Internal Medicine, University of Toronto, Toronto, Canada.
General Internal Medicine and Clinical Pharmacology, University of Toronto, Toronto, Canada.
BMJ Case Rep. 2014 May 23;2014:bcr2013201982. doi: 10.1136/bcr-2013-201982.
A 49-year-old man presented to hospital with severe orthostatic hypotension, gingival dysplasia and a purpuric rash involving his extremities. The orthostatic hypotension failed to respond to fluids and, on the basis of physical examination and dietary history, the patient was given a preliminary diagnosis of scurvy (ascorbic acid deficiency). Serum ascorbic acid levels were undetectable and the orthostasis was resolved within 24 h of ascorbic acid replacement. The pathogenesis of orthostatic hypotension in the setting of scurvy appears to involve impaired catecholamine synthesis and attenuated vasomotor response to α-adrenergic stimulation. We believe that this case describes a rare presentation of scurvy and highlights a previously under-reported connection between scurvy and vasomotor instability.
一名49岁男性因严重直立性低血压、牙龈发育异常和累及四肢的紫癜性皮疹入院。补液治疗对直立性低血压无效,根据体格检查和饮食史,患者被初步诊断为坏血病(抗坏血酸缺乏症)。血清抗坏血酸水平检测不到,补充抗坏血酸后24小时内直立性低血压症状得到缓解。坏血病患者直立性低血压的发病机制似乎涉及儿茶酚胺合成受损以及对α-肾上腺素能刺激的血管运动反应减弱。我们认为该病例描述了坏血病的一种罕见表现,并突出了坏血病与血管运动不稳定之间此前报道不足的联系。