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Lamichhane B, Lamichhane S, Paudel K, Pokhrel NB, Dhital S, Acharya SK. Culture-negative endocarditis with multifocal spread and flail mitral valve leaflet: a case report. Ann Med Surg (Lond) 2024; 86:1161-1165. [PMID: 38333264 PMCID: PMC10849347 DOI: 10.1097/ms9.0000000000001638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Accepted: 12/11/2023] [Indexed: 02/10/2024] Open
Abstract
Introduction Blood culture-negative infective endocarditis is the condition in which a causative organism cannot be identified after inoculation of at least three samples using standard blood-culture systems for 7 days. It has a low reported incidence of about 2.5-31%. Causes may be infectious or non-infectious; use of prior antibiotic therapy is usually the leading factor. Case presentation The authors present a case of true culture-negative endocarditis involving the mitral valve, with multiple foci of spread including brain, spleen, liver, and Intervertebral disc, which remained persistent despite treatment with intravenous broad-spectrum antibiotics on an inpatient and outpatient basis but eventually improved after upgrading alternative broad-spectrum antibiotic for an extended duration. The patient had complications in the form of a flail mitral valve with persistent mitral regurgitation, requiring mitra-clip placement. Discussion Positive blood culture is one of the major diagnostic criteria to establish infective endocarditis. Patients may have persistent negative cultures due to previous antibiotic use, the presence of fastidious organisms, or the use of inappropriate techniques or media. Involvement of a multidisciplinary team, use of multimodal investigations, and appropriate antibiotic stewardship are crucial. Extended duration of treatment and upgrading antibiotics can be helpful next steps in highly suspicious cases. With multifocal spread as in our case, it further becomes challenging to control and treat the infection as it is frequently connected with higher morbidity and mortality. Conclusion Blood culture-negative endocarditis is an entity that can present with early complications. It is diagnostically and therapeutically challenging to treat such patients. Multimodal approaches for early diagnosis and appropriate treatment are crucial owing to its high morbidity and mortality.
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Affiliation(s)
| | | | | | - Nishan B. Pokhrel
- Internal Medicine, Tribhuvan University, Institute of Medicine, Maharajgunj Medical Campus, Kathmandu, Nepal
| | - Sandhya Dhital
- Internal Medicine, Kern Medical Center/Ross University School of Medicine, Castro Valley, FL
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Lin KP, Yeh TK, Chuang YC, Wang LA, Fu YC, Liu PY. Blood Culture Negative Endocarditis: A Review of Laboratory Diagnostic Approaches. Int J Gen Med 2023; 16:317-327. [PMID: 36718144 PMCID: PMC9884005 DOI: 10.2147/ijgm.s393329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Accepted: 01/12/2023] [Indexed: 01/25/2023] Open
Abstract
Infective endocarditis is a potentially fatal condition, and identifying the pathogen is crucial to optimizing antibiotic treatment. While a blood culture takes time and may yield negative results, it remains the gold standard for diagnosis, blood culture-negative endocarditis, which accounts for up to 20% of infective endocarditis cases, poses a clinical challenge with increasing mortality. To better understand the etiology of blood culture-negative infective endocarditis, we reviewed non-culture-based strategies and compared the results. Serology tests work best in limited pathogens, such as Coxiella burnetii and Bartonella infections. Most of the pathogens identified by broad-range PCR tests are Streptococcus spp, Staphylococcus spp and Propionibacterium spp. adding specific real-time PCR assays to the systematic PCR testing of patients with blood culture-negative endocarditis will increase the efficiency of diagnosis. Recently, metagenomic next-generation sequencing has also shown promising results.
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Affiliation(s)
- Kuan-Pei Lin
- Division of Infectious Diseases, Department of Internal Medicine, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Ting-Kuang Yeh
- Division of Infectious Diseases, Department of Internal Medicine, Taichung Veterans General Hospital, Taichung, Taiwan,Genomic Center for Infectious Diseases, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Yu-Chuan Chuang
- Division of Infectious Diseases, Department of Internal Medicine, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Li-An Wang
- Division of Infectious Diseases, Department of Internal Medicine, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Yun-Ching Fu
- Children’s Medical Center, Taichung Veterans General Hospital, Taichung, Taiwan,Department of Post-Baccalaureate Medicine, College of Medicine, National Chung Hsing University, Taichung, Taiwan,Correspondence: Yun-Ching Fu; Po-Yu Liu, Taichung Veterans General Hospital, No. 1650, Section 4, Taiwan Blvd, Xitun District, Taichung City, 40705, Taiwan, Tel +886-4-2359-2525 ext.3110, Fax +886-4-2359-5046, Email ;
| | - Po-Yu Liu
- Division of Infectious Diseases, Department of Internal Medicine, Taichung Veterans General Hospital, Taichung, Taiwan,Department of Post-Baccalaureate Medicine, College of Medicine, National Chung Hsing University, Taichung, Taiwan,Ph.D. Program in Translational Medicine, National Chung Hsing University, Taichung, Taiwan,Rong Hsing Research Center for Translational Medicine, National Chung Hsing University, Taichung, Taiwan
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Liu Y, Wang F, Ge S, Zhang L, Zhang Z, Liu Y, Zhang Y, Ge S, Yu J. Programmable T-Junction Structure-Assisted CRISPR/Cas12a Electrochemiluminescence Biosensor for Detection of Sa-16S rDNA. ACS APPLIED MATERIALS & INTERFACES 2023; 15:617-625. [PMID: 36537539 DOI: 10.1021/acsami.2c18930] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Herein, a strand displacement amplification (SDA)-assisted CRISPR/Cas12a (LbCpf1) electrochemiluminescence (ECL) biosensor was fabricated for ultrasensitive identification of Staphylococcus aureus (Sa)-16S rDNA. A porphyrinic Zr metal-organic framework (MOF) (PCN-224) nanomaterial was prepared as the coreactant accelerator, which promoted the conversion of S2O82- and SO4*-, thus enhancing the reaction with CdS quantum dots (QDs) and amplifying the ECL emission signal. Meanwhile, with the presence of Sa-16S rDNA, the auxiliary probes and primers stimulated the SDA reaction under the action of Klenow fragment (3'-5' exo-) and Nt. BbvCI specifically recognized Sa-16S rDNA to form a defective T-junction structure and generated second primers to initiate the cycles. Such a structure transformed the input signal (Sa-16S rDNA) into substantial single-stranded DNA products (SP) through SDA. SP acted as activators and activated arbitrary side chain cleavage of CRISPR/Cas12a (trans-cleavage) and further realized effective annihilation of ECL signals. This ECL platform demonstrated desirable assay performance for Sa-16S rDNA with a wide response range of 1 fM to 10 nM, and the limit of detection was 0.437 fM (S/N = 3), showing good sensitivity and specificity. Therefore, the method not only expanded the applications of CRISPR/Cas12a but also opened up a novel strategy for clinical diagnosis.
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Affiliation(s)
- Yaqi Liu
- Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan250022, P. R. China
| | - Fengyi Wang
- Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan250022, P. R. China
| | - Shuo Ge
- Department of Medical Laboratory, Shandong Medical College, Jinan250002, P. R. China
| | - Lu Zhang
- Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan250022, P. R. China
| | - Zuhao Zhang
- Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan250022, P. R. China
| | - Yunqing Liu
- Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan250022, P. R. China
| | - Yan Zhang
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan250022, P. R. China
| | - Shenguang Ge
- Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan250022, P. R. China
| | - Jinghua Yu
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan250022, P. R. China
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Kim MGJ, Payne S, Post J. A subacute presentation of Mycoplasma hominis prosthetic valve endocarditis. BMJ Case Rep 2022; 15:e252972. [PMID: 36319037 PMCID: PMC9628652 DOI: 10.1136/bcr-2022-252972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Mycoplasma hominis is a rare but important cause of prosthetic valve endocarditis. It is usually associated with acute progression of symptoms and can be difficult to diagnose as it does not grow in standard culture media. We report a case of an immunocompetent man in his 70s who presented with 14-month subacute decline with shortness of breath and evidence of a splenic infarct. Following a redo aortic valve replacement and diagnosis of M. hominis through 16S ribosomal ribonucleic acid PCR, he improved clinically with oral doxycycline therapy. He remained well at follow-up 2 years post-cessation of antibiotics. We present a literature review highlighting the role of PCR testing in the microbiological identification of M. hominis.
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Affiliation(s)
- Myong Gyu Joshua Kim
- Faculty of Medicine, Prince of Wales Clinical School, University of New South Wales, Randwick, New South Wales, Australia
- Infectious Diseases, Prince of Wales Hospital and Community Health Services, Randwick, New South Wales, Australia
| | - Susannah Payne
- Infectious Diseases, Prince of Wales Hospital and Community Health Services, Randwick, New South Wales, Australia
| | - Jeffrey Post
- Faculty of Medicine, Prince of Wales Clinical School, University of New South Wales, Randwick, New South Wales, Australia
- Infectious Diseases, Prince of Wales Hospital and Community Health Services, Randwick, New South Wales, Australia
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