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Localizing chronic Q fever: a challenging query.

Abstract：

BACKGROUND:Chronic Q fever usually presents as endocarditis or endovascular infection. We investigated whether 18F-FDG PET/CT and echocardiography were able to detect the localization of infection. Also, the utility of the modified Duke criteria was assessed. METHODS:Fifty-two patients, who had an IgG titre of  ≥ 1024 against C. burnetii phase I ≥ 3 months after primary infection or a positive PCR ≥ 1 month after primary infection, were retrospectively included. Data on serology, the results of all imaging studies, possible risk factors for developing proven chronic Q fever and clinical outcome were recorded. RESULTS:According to the Dutch consensus on Q fever diagnostics, 18 patients had proven chronic Q fever, 14 probable chronic Q fever, and 20 possible chronic Q fever. Of the patients with proven chronic Q fever, 22% were diagnosed with endocarditis, 17% with an infected vascular prosthesis, and 39% with a mycotic aneurysm. 56% of patients with proven chronic Q fever did not recall an episode of acute Q fever. Ten out of 13 18F-FDG PET/CT-scans in patients with proven chronic Q fever localized the infection. TTE and TEE were helpful in only 6% and 50% of patients, respectively. CONCLUSIONS:If chronic Q fever is diagnosed, 18F-FDG PET/CT is a helpful imaging technique for localization of vascular infections due to chronic Q fever. Patients with proven chronic Q fever were diagnosed significantly more often with mycotic aneurysms than in previous case series. Definite endocarditis due to chronic Q fever was less frequently diagnosed in the current study. Chronic Q fever often occurs in patients without a known episode of acute Q fever, so clinical suspicion should remain high, especially in endemic regions.

journal_name

BMC Infect Dis

journal_title

BMC infectious diseases

authors

Barten DG,Delsing CE,Keijmel SP,Sprong T,Timmermans J,Oyen WJ,Nabuurs-Franssen MH,Bleeker-Rovers CP

doi

10.1186/1471-2334-13-413

subject

Has Abstract

pub_date

2013-09-03 00:00:00

pages

413

issn

1471-2334

pii

1471-2334-13-413

journal_volume

13

pub_type

杂志文章

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