Pulmonary hypertension in individuals with HIV infection.
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Biomedical subjects
Publications and source records attributed to Stefania Cicalini.
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OBJECTIVES: To describe changes in demographic, clinical and micro-biological characteristics of infective endocarditis (IE), and to assess factors associated with an increased risk of death. METHODS: Episodes fulfilling the Duke criteria for definite IE were included. Data collected in 1980-1991, and 1992-2003 from IVDU and non-IVDU patients' records were collected, and changes within each group and between the groups analysed. RESULTS: There were 169 episodes of IE in IVDUs, and 114 in non-IVDUs. HIV-infected patients were 86 (82 IVDUs). Site of involvement, need for surgery, and case fatality rate (15.6% among IVDUs and 11.3% non-IVDUs) did not change in both groups over time. Staphylococci and streptococci were the most commonly isolated organisms among IVDUs and non-IVDU, respectively; independent predictors of mortality among IVDUs were negative blood cultures [adjusted OR (AOR) 7.85], and fungal etiology (AOR 21.33). Among non-IVDUs prosthetic heart valves had an AOR of 2.22 (95% CI 0.48-10.21); the proportion of negative blood cultures significantly increased. An higher case-fatality rate was observed among HIV-positive patients (AOR 2.64 95% CI 0.85-8.20). CONCLUSIONS: Late diagnosis and lack of etiological definition continue to represent the most important obstacles to an effective management of IE, suggesting the need for a wider use of molecular techniques in patients with suspected IE.
Human herpesvirus 8 (HHV-8) antibodies were detected in 1 of 33 patients with pulmonary hypertension (including in 1 of 16 with idiopathic pulmonary arterial hypertension), 5 of 29 with cystic fibrosis, and 3 of 13 with interstitial lung disease. No relationship between HHV-8 infection and pulmonary hypertension was found.
In the era of new, potent antiretroviral therapy, much more attention is being given to non-infectious complications of HIV diseases, such as cardiomyopathy, pericardial effusion and pulmonary hypertension (PH). PH diagnosis is based on a mean pulmonary artery pressure of more than 25 mmHg at rest, or more than 30 mmHg with exercise. The incidence of PH is about 0.1% per year among HIV-positive patients, while in the general population it is 1 to 2 cases per million people. The histopathology of HIV-associated PH (HAPH) is similar to that of idiopathic PH, although its pathogenesis is still unclear. In patients with HAPH secondary causes of PH must be ruled out, such as intravenous drug abuse, valvulopathy, congenital heart disease and previous tricuspid endocarditis. The treatment of HAPH is not substantially different from that of idiopathic PH and is essentially based on the use of vasodilators. The Regional Authority of Lazio (Italy) has instituted a Registry for PH in HIV-positive patients; its aims are to evaluate the real incidence and prevalence of primitive and secondary PH among patients with HIV infection, and optimise the management of patients with suspected PH through the definition of a diagnostic algorithm.
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The European Commission funded a project for the standardisation of the management of occupational exposures to HIV/blood-borne infections and antiretroviral post-exposure prophylaxis (PEP) in Europe. Within this project, the following recommendations and rationale were formulated by experts representative of participating countries. Based on assessment of the exposure, material, and source characteristics, PEP should be started as soon as possible with any triple combination of antiretrovirals approved for the treatment of HIV-infected patients; initiation is discouraged after 72 hours Rapid HIV testing of the source could reduce inappropriate PEP. HIV testing should be performed at baseline, 4, 12, and 24 weeks, with additional clinical and laboratory monitoring of adverse reactions and potential toxicity at week 1 and 2. HIV resistance tests in the source and direct virus assays in the exposed HCW are not recommended routinely. These easy-to-use recommendations seek to maximise PEP effect while minimising its toxicity and inappropriate use.
After careful review of evidence-based literature, clinical and laboratory criteria for diagnosis of bacterial and fungal endocarditis are examined. The choice criteria for therapy of bacterial endocarditis, both empiric and directed against a specific pathogen, are reviewed, on the basis of the clinical and epidemiological context (prosthetic or native valve, left or right heart, drug addiction). Different treatment options are proposed, based on results of antibiotic resistance testing. Indications and contraindications for a parenteral home treatment and those for surgical treatment are examined, also according to the results of ultrasonography.
Intravascular catheters have become essential devices for the management of critically and chronically ill patients. However, their use is often associated with serious infectious complications, mostly catheter-related bloodstream infection (CRBSI), resulting in significant morbidity, increased duration of hospitalization, and additional medical costs. The majority of CRBSIs are associated with central venous catheters (CVCs), and the relative risk for CRBSI is significantly greater with CVCs than with peripheral venous catheters. However, most CVC-related infections are preventable, and different measures have been implemented to reduce the risk for CRBSI, including maximal barrier precautions during catheter insertion, catheter site maintenance, and hub handling. The focus of the present review is on new technologies for preventing infections that are directed at CVCs. New preventive strategies that have been shown to be effective in reducing risk for CRBSI, including the use of catheters and dressings impregnated with antiseptics or antibiotics, the use of new hub models, and the use of antibiotic lock solutions, are briefly described.
In this paper we communicate our experience with 60 patients who suffered two or more episodes of infectious endocarditis (IE), selected from 1053 cases of IE defined in accordance with Duke's Hospital criteria. Relapsing IE was diagnosed when episodes occurred with at least a 6 month interval between them or when, even if the time distance was shorter, they were caused by different microorganisms. Sixty-four cases of relapsing IE were observed. In each patient we considered age, sex, presence of risk-factors for IE, time laps from the onset of symptomatic disease to diagnosis, time interval between the two or more IE episodes, aetiology, endocarditic location, echocardiographic elements, therapy, complications and final outcome were considered. We conclude, agreeing with other authors, that infectious endocarditis may rightfully be considered a risk factor for further IE episodes and that, for this reason, an adequate prophylactic therapy must be given.
The authors demonstrate that time necessary for diagnosis in 902 patients with validated infectious endocarditis was significantly shorter in 249 drug addicts confronted with 653 non-addicted patients. With regard to the latter category we noticed a significant tendency in diagnostic time reduction in the last five years of observation and this is probably due to the improved knowledge on infectivologists regarding the clinical presentation of infectious endocarditis rather than the application of validating protocols
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In our series, including 1053 cases of infective endocarditis (IE) collected from 86 Infectious Diseases Centres in Italy between 1984 and 1999, we identified 34 cases (3.2%) with a polymicrobial etiology. Intravenous drug abuse was the most important risk factor for the development of polymicrobial IE. Twenty three patients had a left sided-IE and 6 patients had a right-sided IE. The most commonly encountered microorganisms were Staphylococci and Streptococci and the most frequently observed associations of microorganisms were those between Staphylococci and Gram-negative bacteria and between Staphylococci and fungi. Twelve patients (35.3%) underwent surgery, and 5 patients (16.7%) died. Polymicrobial endocarditis did not differ clinically from IE caused by a single microorganism, and the prognosis seems to be related to the site of infection and to some specific pathogens.
We studied clinical presentations on admission in Infectious Disease Wards of 1053 patients (308 i.v. drug abusers and 745 non drug abusers) with IE validated according to the Duke Hospitals' criteria, from a total of 1164 patients observed from 1984 to 1999. We divided the patients in three five-year span groups (1984-89, 1990-94 and 1995-99) and we examined signs and symptoms on presentation that led us to suspect I.E. (sepsis, valvulopathy, peripheric vascular damage and predisposing conditions including i.v. drug abuse). Our study confirms that clinical diagnosis of I-E. nowadays is reliable if history and physical examination are carried out correctly.