A 71-year-old woman with recurrent falls and confusion
Identifieur interne : 002962 ( Pmc/Corpus ); précédent : 002961; suivant : 002963A 71-year-old woman with recurrent falls and confusion
Auteurs : Mansoor Mehmood ; Omar N. Nadhem ; Faisal A. KhasawnehSource :
- The Canadian Journal of Infectious Diseases & Medical Microbiology [ 1712-9532 ] ; 2014.
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PubMed: 25587294
PubMed Central: 4277160
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">A 71-year-old woman with recurrent falls and confusion</title><author><name sortKey="Mehmood, Mansoor" sort="Mehmood, Mansoor" uniqKey="Mehmood M" first="Mansoor" last="Mehmood">Mansoor Mehmood</name><affiliation><nlm:aff id="af1-idmm-25-321">Department of Internal Medicine;</nlm:aff></affiliation></author><author><name sortKey="Nadhem, Omar N" sort="Nadhem, Omar N" uniqKey="Nadhem O" first="Omar N" last="Nadhem">Omar N. Nadhem</name><affiliation><nlm:aff id="af1-idmm-25-321">Department of Internal Medicine;</nlm:aff></affiliation></author><author><name sortKey="Khasawneh, Faisal A" sort="Khasawneh, Faisal A" uniqKey="Khasawneh F" first="Faisal A" last="Khasawneh">Faisal A. Khasawneh</name><affiliation><nlm:aff id="af2-idmm-25-321">Section of Infectious Diseases, Department of Internal Medicine, Texas Tech University Health Sciences Center, Amarillo, Texas, USA</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">25587294</idno><idno type="pmc">4277160</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4277160</idno><idno type="RBID">PMC:4277160</idno><date when="2014">2014</date><idno type="wicri:Area/Pmc/Corpus">002962</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">002962</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">A 71-year-old woman with recurrent falls and confusion</title><author><name sortKey="Mehmood, Mansoor" sort="Mehmood, Mansoor" uniqKey="Mehmood M" first="Mansoor" last="Mehmood">Mansoor Mehmood</name><affiliation><nlm:aff id="af1-idmm-25-321">Department of Internal Medicine;</nlm:aff></affiliation></author><author><name sortKey="Nadhem, Omar N" sort="Nadhem, Omar N" uniqKey="Nadhem O" first="Omar N" last="Nadhem">Omar N. Nadhem</name><affiliation><nlm:aff id="af1-idmm-25-321">Department of Internal Medicine;</nlm:aff></affiliation></author><author><name sortKey="Khasawneh, Faisal A" sort="Khasawneh, Faisal A" uniqKey="Khasawneh F" first="Faisal A" last="Khasawneh">Faisal A. Khasawneh</name><affiliation><nlm:aff id="af2-idmm-25-321">Section of Infectious Diseases, Department of Internal Medicine, Texas Tech University Health Sciences Center, Amarillo, Texas, USA</nlm:aff></affiliation></author></analytic><series><title level="j">The Canadian Journal of Infectious Diseases & Medical Microbiology</title><idno type="ISSN">1712-9532</idno><idno type="eISSN">1918-1493</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Ngo, Jt" uniqKey="Ngo J">JT Ngo</name></author><author><name sortKey="Parkins, Md" uniqKey="Parkins M">MD Parkins</name></author><author><name sortKey="Gregson, Db" uniqKey="Gregson D">DB Gregson</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Heikinheimo, A" uniqKey="Heikinheimo A">A 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article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Can J Infect Dis Med Microbiol</journal-id><journal-id journal-id-type="iso-abbrev">Can J Infect Dis Med Microbiol</journal-id><journal-id journal-id-type="publisher-id">PGI</journal-id><journal-title-group><journal-title>The Canadian Journal of Infectious Diseases & Medical Microbiology</journal-title></journal-title-group><issn pub-type="ppub">1712-9532</issn><issn pub-type="epub">1918-1493</issn><publisher><publisher-name>Pulsus Group Inc</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">25587294</article-id><article-id pub-id-type="pmc">4277160</article-id><article-id pub-id-type="publisher-id">idmm-25-321</article-id><article-categories><subj-group subj-group-type="heading"><subject>Clinical Vignette</subject></subj-group></article-categories><title-group><article-title>A 71-year-old woman with recurrent falls and confusion</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Mehmood</surname><given-names>Mansoor</given-names></name><degrees>MD</degrees><xref ref-type="aff" rid="af1-idmm-25-321"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Nadhem</surname><given-names>Omar N</given-names></name><degrees>MD</degrees><xref ref-type="aff" rid="af1-idmm-25-321"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Khasawneh</surname><given-names>Faisal A</given-names></name><degrees>MD</degrees><xref ref-type="corresp" rid="c1-idmm-25-321"></xref><xref ref-type="aff" rid="af2-idmm-25-321"><sup>2</sup></xref></contrib></contrib-group><aff id="af1-idmm-25-321"><label>1</label>Department of Internal Medicine;</aff><aff id="af2-idmm-25-321"><label>2</label>Section of Infectious Diseases, Department of Internal Medicine, Texas Tech University Health Sciences Center, Amarillo, Texas, USA</aff><author-notes><corresp id="c1-idmm-25-321">Correspondence: Dr Faisal A Khasawneh, Section of Infectious Diseases, Department of Internal of Medicine, Texas Tech University Health Sciences Center, 1400 South Coulter Street, Amarillo, Texas 79106, USA. Telephone 806-354-5480, fax 806-354-5765, e-mail <email>faisal.khasawneh@ttuhsc.edu</email></corresp></author-notes><pub-date pub-type="ppub"><season>Nov-Dec</season><year>2014</year></pub-date><volume>25</volume><issue>6</issue><fpage>321</fpage><lpage>322</lpage><permissions><copyright-statement>Copyright© 2014 Pulsus Group Inc. All rights reserved</copyright-statement><copyright-year>2014</copyright-year><license><license-p>This open-access article is distributed under the terms of the Creative Commons Attribution Non-Commercial License (CC BY-NC) (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by-nc/4.0/">http://creativecommons.org/licenses/by-nc/4.0/</ext-link>), which permits reuse, distribution and reproduction of the article, provided that the original work is properly cited and the reuse is restricted to noncommercial purposes. For commercial reuse, contact <email>support@pulsus.com</email></license-p></license></permissions></article-meta></front><body><sec><title>CASE PRESENTATION</title><p>A 71-year-old African-American woman presented to the authors’ hospital with recurrent falls and confusion. She reported fatigue, loss of appetite and weight loss that had been progressing over several months. In the two days before her presentation, she felt dizzy and the family noticed intermittent confusion. She denied fever, respiratory or urinary symptoms. She reported chronic constipation but no abdominal pain or vomiting. Her medical history was significant for rheumatoid arthritis (RA) and hypertension. The patient’s RA had never been treated, despite disease progression over the years; meanwhile, her hypertension was well controlled on hydrochlorothiazide and amlodipine. The patient denied smoking, alcohol abuse or illicit drug use. She also denied any recent medical procedures or dental work.</p><p>On examination, she was afebrile, with a temperature of 37.4°C and a blood pressure of 96/58 mmHg. Her heart rate was 92 beats/min and her oxygen saturation was 94% on room air. She was cachectic with no lymphadenopathy. She was edentulous with no gum line swelling or tenderness. Her skin was intact, with no bruising or rashes. She had clear lung fields, regular heart sounds without murmurs and soft abdomen with no organomegaly. She had obvious chronic joint deformities related to her RA. Her neurological examination was nonfocal.</p><p>Laboratory test results revealed a hemoglobin level of 98 g/L and white blood cell count of 10.6×10<sup>9</sup> cells/L. Chemistry tests showed a creatinine level of 106.1 μmol/L and albumin level of 19.0 g/L; alkaline phosphatase, total bilirubin and liver transaminase levels were normal. Computed tomography scans of the brain were negative. Urinalysis and chest x-ray were negative. The anaerobic bottles of the blood culture sets obtained on admission were observed to be positive after 24 h. The Gram stain of the positive bottles is shown in <xref ref-type="fig" rid="f1-idmm-25-321">Figure 1</xref>.</p><p>What is your diagnosis?</p></sec><sec><title>DIAGNOSIS</title><p>The Gram stain showed Gram-positive bacilli that were identified to be <italic>Clostridium perfringens</italic>. The bacterium grew in the automatic blood culture system VersaTrek (TREK Diagnostic Systems, USA) and was identified using the Microscan WalkAway Plus system (Siemens, Germany). Antibiotic susceptibility testing was not performed on the isolated bacteria because the authors’ clinical laboratory did not have the capability to perform such testing on anaerobic bacteria. The patient was started on benzathine penicillin G and clindamycin. The patient’s history and physical examination was not suspicious for soft tissue, odontogenic or procedural sources of this infection. Based on the above, an underlying abdominal or pelvic pathology, especially a malignancy, was suspected. She underwent computed tomography scan of the abdomen and pelvis with contrast as well as colonoscopy that were negative. She completed a 14-day course of the above-mentioned antibiotics with no side effects. The patient’s cachexia and chronic constitutional complaints were attributed to undiagnosed depression and she continues to be followed in the outpatient clinic.</p></sec><sec sec-type="discussion"><title>DISCUSSION</title><p>Bacteremia due to obligate anaerobes is uncommon. <italic>Clostridium</italic> species account for <1% of positive blood cultures and are second to <italic>Bacteroides</italic> among isolated anaerobes (<xref rid="b1-idmm-25-321" ref-type="bibr">1</xref>–<xref rid="b3-idmm-25-321" ref-type="bibr">3</xref>). <italic>C perfringens</italic> is the most commonly isolated <italic>Clostridium</italic> species in blood cultures. A retrospective population-based surveillance in Calgary, Alberta, identified 904 cases of anaerobic bacteremia between 2000 and 2008, with an overall population incidence of 8.7 per 100,000 per year (<xref rid="b1-idmm-25-321" ref-type="bibr">1</xref>). The most commonly identified bacteria were <italic>Bacteroides fragilis</italic>, <italic>Clostridium</italic> non-<italic>perfringens</italic> species, <italic>Peptostreptococcus</italic> species and <italic>C perfringens</italic>, respectively.</p><p><italic>Clostridium</italic> species are nonmotile, obligate anaerobic Gram-positive bacteria that are capable of forming endospores and are ubiquitous in nitrate-rich environments, such as sewage and soil, as well as in the intestinal tract of humans and animals (<xref rid="b2-idmm-25-321" ref-type="bibr">2</xref>).</p><p><italic>C perfringens</italic> has been implicated in causing a wide variety of clinical syndromes ranging from skin and soft tissue infections and gas gangrene, to gastroenteritis and enteritis necroticans (<xref rid="b3-idmm-25-321" ref-type="bibr">3</xref>–<xref rid="b6-idmm-25-321" ref-type="bibr">6</xref>).</p><p>After acquiring the bacteria, or its spores, from exogenous or endogenous sources, and in the presence of suitable anaerobic conditions, <italic>C perfringens</italic> vegetates and multiplies rapidly, producing a wide variety of toxins that mediate its pathogenicity. Those toxins include cytolytic enzymes, enterotoxins, collagenases, proteases and other necrotoxins (<xref rid="b7-idmm-25-321" ref-type="bibr">7</xref>–<xref rid="b9-idmm-25-321" ref-type="bibr">9</xref>).</p><p>Clinical correlates determine the exact significance of clostridial bacteremia. It may be a transient bacteremia or, potentially, a pseudo-bactermia (a contaminant), if the patient had no risk factors or symptoms and signs consistent with an infection (<xref rid="b10-idmm-25-321" ref-type="bibr">10</xref>). More commonly, however, it is a life-threatening event, and the patient is profoundly septic and at high risk for death (<xref rid="b10-idmm-25-321" ref-type="bibr">10</xref>,<xref rid="b11-idmm-25-321" ref-type="bibr">11</xref>). Furthermore, it can be a surrogate of underlying malignancy necessitating further investigation (<xref rid="b4-idmm-25-321" ref-type="bibr">4</xref>).</p><p>Reported <italic>C perfringens</italic> bacteremia risk factors include neutropenia and other immunocompromising disorders, advanced age, hemodialysis and inflammatory bowel diseases (<xref rid="b12-idmm-25-321" ref-type="bibr">12</xref>–<xref rid="b16-idmm-25-321" ref-type="bibr">16</xref>). Poorly attended traumatic wounds and suboptimal surgical techniques can also put the patient at risk for this infection (<xref rid="b5-idmm-25-321" ref-type="bibr">5</xref>,<xref rid="b7-idmm-25-321" ref-type="bibr">7</xref>,<xref rid="b8-idmm-25-321" ref-type="bibr">8</xref>). This bacteremia has rarely complicated routine colonoscopy, evacuating molar pregnancy, choledocholithiasis and strongyloidiasis (<xref rid="b9-idmm-25-321" ref-type="bibr">9</xref>,<xref rid="b12-idmm-25-321" ref-type="bibr">12</xref>–<xref rid="b14-idmm-25-321" ref-type="bibr">14</xref>). It is noteworthy that a substantial number of patients with <italic>C perfringens</italic> bacteremia do not have an obvious source (<xref rid="b15-idmm-25-321" ref-type="bibr">15</xref>).</p><p>The presentation of <italic>C perfringens</italic> bacteremia is nonspecific and depends on disease severity, concomitant infection and organ systems involvement. Nausea, vomiting, abdominal pain, jaundice, loss of appetite and melena are common complaints (<xref rid="b5-idmm-25-321" ref-type="bibr">5</xref>). Other common findings include fever, hypotension and elevated white blood cell counts. A classical picture of <italic>C perfringens</italic> septicemia has been described in elderly patients with underlying malignancy, and encompasses abdominal pain and septic shock complicated by severe anemia due to massive intravascular hemolysis caused by a specific clostridial toxin (alpha toxin). Reported mortality rates for the latter condition range from 70% to 100% (<xref rid="b16-idmm-25-321" ref-type="bibr">16</xref>).</p><p>Successful management of this infection requires prompt recognition and initiation of appropriate antimicrobial therapy, among other support measures, in addition to surgical intervention and debridement when necessary. For isolated <italic>C perfringens</italic> bacteremia, penicillin is considered to be the drug of choice, either alone or in combination with clindamycin, although emergence of resistance against the latter has been reported (<xref rid="b3-idmm-25-321" ref-type="bibr">3</xref>). Ngo et al (<xref rid="b1-idmm-25-321" ref-type="bibr">1</xref>) reported the susceptibility of 71 <italic>C perfringens</italic> blood isolates to penicillin, metronidazole and clindamycin (<xref rid="b1-idmm-25-321" ref-type="bibr">1</xref>). None of the above isolates were resistant to penicillin or metronidazole, although 11 (15.5%) were resistant to clindamycin. Other commonly used effective antibiotics include ampicillin/sulbactam and piperacillin/tazobactam (<xref rid="b4-idmm-25-321" ref-type="bibr">4</xref>). Exchange transfusion and hyperbaric oxygen therapy may be of help in bacteremia cases complicating skin or soft tissue infections, especially if shock and hemolysis are evident (<xref rid="b17-idmm-25-321" ref-type="bibr">17</xref>). The latter intervention disrupts the bacterial anaerobic environment and, hence, facilitates eradication of the microbe in small abscesses and ischemic infected tissues.</p><p>Poor prognostic factors include old age, elevated serum fibrinogen levels, septic shock, nosocomial acquisition of infection, hemolysis, polymicrobial bacteremia and insufficient antimicrobial coverage (<xref rid="b11-idmm-25-321" ref-type="bibr">11</xref>). Despite appropriate therapy, the overall mortality of this rare bacteremia continues to be high (<xref rid="b3-idmm-25-321" ref-type="bibr">3</xref>,<xref rid="b4-idmm-25-321" ref-type="bibr">4</xref>,<xref rid="b10-idmm-25-321" ref-type="bibr">10</xref>,<xref rid="b11-idmm-25-321" ref-type="bibr">11</xref>). In the abovementioned retrospective surveillance, the overall case fatality rate of anaerobic bacteremia was 20% (<xref rid="b1-idmm-25-321" ref-type="bibr">1</xref>). The case fatality rate was higher in <italic>C perfringens</italic> bacteremia (29.7%) than in <italic>B fragilis</italic> cases (16.6%). 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