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Biomedical subjects

E Bouvet

Publications and source records attributed to E Bouvet.

At least 55 records · Page 3Linked to original sources
PubMed1998

Pulmonary tuberculosis: computed tomography and high-resolution computed tomography patterns in patients who are either HIV-negative or HIV-seropositive.

To compare findings of active pulmonary tuberculosis on computed tomography (CT) and high-resolution computed tomography (HRCT) scans in patients without the human immunodeficiency virus (HIV) and patients with HIV, and to define the spectrum of pulmonary tuberculosis in patients with HIV according to the CD4 T cell status, 76 patients (47 patients without HIV and 29 patients with HIV) with newly diagnosed pulmonary tuberculosis were studied retrospectively. The diagnosis of active pulmonary tuberculosis was based on acid-fast bacilli (AFB) in sputum culture. All patients underwent CT within 1 month of diagnosis. Patients with HIV demonstrated significantly less cavitation and bronchial wall thickening (24% vs. 49% [p < 0.05]; and 14% vs. 45% [p < 0.01], respectively) than the combined group of patients with HIV. Centrilobular nodules were significantly less common in patients without HIV (14% vs. 45%, p < 0.05). Lymphadenopathy with low attenuation centers was significantly less frequent in the patients with HIV (3% vs. 15%, p < 0.05). In patients with HIV, cavitation, lymphadenopathy, as well as the the number of nodules and the number of lobes involved correlated well with the CD4 levels. Two patients with less than 50 CD4 T cells/mm3 had normal chest CT results. Atypical chest CT patterns are frequently encountered in patients with HIV. Knowledge of these CT patterns may assist in the diagnosis and follow-up of patients with HIV with known or suspected pulmonary tuberculosis.

Adult↗
PubMed1998

[Invasive pulmonary aspergillosis in AIDS].

Risk factor for invasive pulmonary aspergillosis in HIV-negative patients include neutropenia, corticosteroid therapy, and chemotherapy. Corresponding risk factors in HIV-positive patients have not yet been reported. A case-control study was conducted at the Bichat-Claude Bernard Teaching Hospital, Paris, France, between 1991 and 1996. Eight cases were identified. In three cases, the diagnosis was documented histologically. Of the remaining five patients, four had a de novo lung cavity with a positive bronchoscopy sample, and one had a pulmonary infiltrate with a positive bronchoscopy sample in the absence of any other potential pathogen. Each case was matched with three controls who were admitted during the same period and had CD4 counts lower than 50/mm3. Median age was 38.1 years in the cases and 38.4 years in the controls. Median CD4 counts were 12.5 +/- 19.2 in the cases versus 19.3 +/- 16.3 in the controls (P = 0.14). No case-control differences were found for AIDS duration, neutrophil counts at diagnosis or during the previous six months, history of corticosteroid therapy or chemotherapy, or number of previous opportunistic infections. Cases were more likely than controls to have a preexisting lung cavity (3/8 versus 0/24; P = 0.01) and had spent more time in the hospital during the previous year (7 +/- 4.5 versus 2.8 +/- 3.2 weeks; P = 0.02). These data do not support a role for neutropenia or immunosuppressive treatments as risk factors for invasive aspergillosis in AIDS. They suggest that AIDS patients with a lung cavity or frequent hospital stays are at increased risk for invasive aspergillosis.

AIDS-Related Opportunistic Infections↗
PubMed1996

[Tuberculosis. Current therapeutics].

Due to the constant decline in incidence up to the mid eighties, eradication of tuberculosis appeared to be an attainable objective in developed countries. Since then multiple factors (HIV epidemic, poor social conditions in certain unfavored areas, population migrations, urbanization) have led to an increased frequency, making an excellent knowledge of tuberculosis a priority for all physicians. Multi-resistant mycobacteria have also made their appearance leading to numerous clinical and experimental studies which provide new insights into the correct management of patients with tuberculosis. Despite these recent changes, the classical treatment for tuberculosis remains the same in most cases, allowing nearly-certain cure when applied correctly in patients infected with a susceptible bacteria, including those with HIV infection or extrapulmonary localizations. On the contrary, the spontaneous aggravation of multi-resistant tuberculosis, even in some cases being treated, emphasizes the need to test the strain's susceptibility to the antituberculous agents used. Certain new antibiotics, including fluoroquinolones, may play an important role in some cases. The contribution of surgery, isolation and strict compliance must also be emphasized. Resistant strains may also led to renewed indications for the Calmette-Guérin vaccine.

AIDS-Related Opportunistic Infections↗
PubMed1996

Assessment of right ventricle function and pulmonary artery circulation by cine-MRI in patients with AIDS.

OBJECTIVE: To evaluate right ventricle (RV) anatomy and performance and its relationships with pulmonary circulation in AIDS patients. DESIGN: We conducted a prospective blinded study by using cine-MRI, a well-accepted method to assess RV and pulmonary circulation. SETTING: A university hospital. PARTICIPANTS: Ten healthy volunteers and 13 asymptomatic AIDS patients. MEASUREMENTS: RV end-diastolic and end-systolic volumes, RV ejection fraction (RVEF), pulmonary artery (PA) diameter, main pulmonary artery distensibility (MPAD), RV free wall diastolic thickness (RVWT), and RV mass were measured. The RVWT/left ventricular wall thickness index was calculated. RESULTS: AIDS patients had significantly increased RV end-diastolic and end-systolic volumes and decreased RVEF (50 +/- 10 vs 59 +/- 6; p < 0.03). Four AIDS patients had RV wall motion abnormalities; 5 (38%) had an RVEF under 45%. RVWT, the RVWT/left ventricular wall thickness index, and PA diameter were significantly increased in AIDS patients. RV mass was increased in 54% of AIDS patients. MPAD was significantly lower in AIDS patients (18.8 +/- 15 vs 26 +/- 4; p < 0.01). A significant relationship was found between RV mass and MPAD (r = 0.76; p = 0.02). CONCLUSIONS: RV function is frequently impaired in AIDS patients. Anatomic and functional abnormalities found in RV and PA parameters suggest a systolic overload on RV. Pulmonary circulation abnormalities may influence RV structure and function in AIDS patients.

Acquired Immunodeficiency Syndrome↗
PubMed1995

[Risks of accidental exposure to blood in the operating room. Results of a multicenter prospective study. Groupe d'Etude sur les Risques d'Exposition au Sang].

A multicentric prospective trial was conducted to evaluate the frequency and kind of blood exposure in operating room. From march to june 1992, 3554 procedures were observed in 22 surgical units (visceral, orthopaedic and vascular), with 129 surgeons, 133 residents and 216 nurses. Statistic analysis was done on Epi Info 5 (CDC Atlanta) and EGRET (Statistic and Epidemiology Research Corporation, Seattle). 11.7% of procedures were the case for an incidental blood exposure: 4.2% for percutaneous exposure; 8.4% for cutaneous or mucosal exposure. Rates change with the surgical specialty. Surgeons were involved in 50.7% of percutaneous exposure and 58.7% of the cutaneous or mucosal exposures, especially when they were operators (respectively 2 and 5.6% person-act). A significative rate was founded between incidental blood exposure and the length of procedure, the sepsis character of the procedure, but not with emergency or number of globular units transfused. To diminish the incidental blood exposure and its risks, this data suggests three kinds of practice: a better work for vaccination; in our study 59% of surgeons declare an adequate vaccination against hepatitis B; a best operative hygiene, with knowing of risks factor of blood exposure, depending of the kind of procedure, changing between different units; the use of protections: non coated dressing, double gloving, ocular protection.

Acquired Immunodeficiency Syndrome↗
PubMed1995

[Focus on the role of ventilation and ultraviolet rays in preventing nosocomial transmission of tuberculosis in health care facilities. Groupe de travail sur la prévention de la transmission nosocomiale de la tuberculose (Direction Générale de la Santé)].

Recent episodes of nosocomial tuberculosis, sometimes due to multiresistant strains, in HIV infected patients in the USA has led to the need for new prevention measures against the transmission of Mycobacterium tuberculosis in health care facilities. Tuberculosis is transmitted in Pflügge droplets generated when contagious persons cough. After drying, the droplets become aerosolized solid particles which are rapidly dispersed by air flow within the patient's room. People exposed to the same air are thus at high risk of being contaminated. If the air pressure in the patient's room is higher than the rest of the facility, the air coming form the room may contaminate personnel and other patients elsewhere in the facility. Infecting particles can be eliminated rapidly if the room air is ventilated outdoors. If the ventilation is strong enough so that air constantly circulates from the corridor into the room, infecting particles can no longer diffuse to the rest of the ward. It is also possible to use ultraviolet C light to disinfect the air, either within the room or within the ventilation system. These two basically simple systems are the fundamental environmental and prevention measures needed to limit tuberculosis spread in health care facilities. These methods are however technically complex, costly and require constant evaluation and maintenance by specialized personnel. In addition the potential side effects of ultraviolet waves could considerably reduce their application. These environmental methods, which are complementary methods, only have a meaning if the elementary measures for preventing the transmission of tuberculosis are correctly applied.(ABSTRACT TRUNCATED AT 250 WORDS)

Cross Infection↗
PubMed1994

Pulmonary Kaposi's sarcoma revealed by a solitary nodule in a patient with acquired immunodeficiency syndrome.

Kaposi's sarcoma is very common in patients with AIDS. Usually, skin lesions are associated with various visceral involvements. A homosexual patient with AIDS presented with cough and dyspnea, which were followed months later by hemoptysis. He had no skin lesions or endobronchial Kaposi's sarcoma at any time. His chest radiograph showed only an irregular solitary nodule. It exhibited very slow development over time. Surgery was performed, and this solitary nodule proved to be pulmonary Kaposi's sarcoma. Pulmonary Kaposi was the sole manifestation of this associated AIDS sarcoma. This very unusual case report of pulmonary Kaposi sarcoma indicates that this diagnosis should be considered in patients with AIDS presenting with a solitary pulmonary nodule.

Acquired Immunodeficiency Syndrome↗
PubMed1994

Clinical efficacy and pharmacokinetics of micronized halofantrine for the treatment of acute uncomplicated falciparum malaria in nonimmune patients.

Twenty-eight nonimmune patients with acute uncomplicated falciparum malaria returning from subSaharan Africa were treated with a micronized formulation of halofantrine hydrochloride (three doses of 250 mg at 6-hr intervals) to investigate the drug's efficacy, tolerance, and pharmacokinetics. In vitro drug susceptibility patterns were determined by the isotopic semimicrotest. Twenty-four of 28 patients were cured. Two of the four patients experiencing recrudescence were associated with low absorption of the drug and parasites susceptible in vitro to halofantrine. The other two patients had adequate plasma concentrations of halofantrine and its main human metabolite, N-desbutylhalofantrine, but the isolates were also resistant in vitro to the drugs, suggesting drug resistance as the cause of treatment failure. Only mild, transitory side effects were noted. A wide interindividual variation in plasma concentrations of halofantrine and its metabolite was observed. Pharmacokinetic studies suggested that the micronized formulation of halofantrine hydrochloride may not increase drug absorption considerably. Further studies using higher doses or longer treatment periods are needed to ensure that adequate plasma concentrations of the drug are used.

Acute Disease↗
PubMed1994

Persistent enhancement after treatment for cerebral toxoplasmosis in patients with AIDS: predictive value for subsequent recurrence.

PURPOSE: To determine the predictive imaging (CT and/or MR) features of brain toxoplasmosis recurrences in acquired immunodeficiency syndrome. METHODS: The imaging studies of patients with brain toxoplasmosis were retrospectively reviewed. Forty-three patients with significant decrease or disappearance of brain lesions under specific treatment on follow-up imaging examinations were included. MR examinations were performed using T2- and T1-weighted sequences, before and after intravenous administration of gadolinium-DOTA. RESULTS: A recurrence occurred in 11 (26%) of 43 cases. Ten (91%) of these 11 patients with recurrence showed focal persistent enhancement after the initial treatment of toxoplasmosis abscess. One of the 11 patients with recurrence showed no persistent enhancement; 3 patients showed persistent enhancement but had no recurrence. CONCLUSIONS: Recurrences of brain toxoplasmosis in our series correlated with persistent contrast enhancement. We hypothesize that demonstration of persistent areas of contrast enhancement after treatment for initial toxoplasmosis may be a valuable sign for identifying patients at risk for recurrence.

AIDS-Related Opportunistic Infections↗
PubMed1994

[Epidemiology of tuberculosis].

Despite imperfect surveillance systems, it is clear that the incidence of tuberculosis has increased throughout the world and particularly in third world countries. Associated factors explaining the changes in the epidemiology of tuberculosis are HIV infection and increased resistance to major antituberculosis drugs. Major measures must be taken to fight against this new rise in the incidence of tuberculosis in the world.

AIDS-Related Opportunistic Infections↗
PubMed1993

Dapsone-pyrimethamine compared with aerosolized pentamidine as primary prophylaxis against Pneumocystis carinii pneumonia and toxoplasmosis in HIV infection. The PRIO Study Group.

BACKGROUND: Pneumocystis carinii pneumonia and toxoplasmic encephalitis are frequent life-threatening opportunistic infections in patients with human immunodeficiency virus (HIV) infection. Primary prophylaxis against P. carinii pneumonia is now common, but there are few data on regimens for primary prophylaxis against toxoplasmosis. METHODS: We conducted a randomized trial that compared two prophylactic regimens: dapsone (50 mg per day) plus pyrimethamine (50 mg per week) was compared with aerosolized pentamidine (300 mg per month). The patients had symptomatic HIV infection, no history of P. carinii pneumonia or symptomatic toxoplasmosis, and CD4+ counts below 200 per cubic millimeter (0.2 x 10(9) per liter). RESULTS: In an intention-to-treat analysis, after a median follow-up of 539 days P. carinii pneumonia developed in 10 patients in each group, whereas toxoplasmosis developed in 32 of 176 patients in the pentamidine group and 19 of 173 patients in the dapsone-pyrimethamine group. Those assigned to pentamidine had a risk of P. carinii pneumonia that was similar to the risk in those assigned to dapsone-pyrimethamine (adjusted relative risk, 1.13; 95 percent confidence interval, 0.44 to 2.92; P = 0.79), but a higher risk of toxoplasmosis (adjusted relative risk, 1.81; 95 percent confidence interval, 1.12 to 2.94; P = 0.02). Among the 262 patients with serologic evidence of past exposure to Toxoplasma gondii, the relative risk of symptomatic toxoplasmosis was 2.37 times higher in those assigned to pentamidine (95 percent confidence interval, 1.3 to 4.4; P = 0.006). More patients discontinued dapsone-pyrimethamine than pentamidine because of toxicity (42 vs. 3; P < 0.001). Survival was similar in the two groups. CONCLUSIONS: For primary prevention of P. carinii pneumonia, dapsone-pyrimethamine is as effective, though not as well tolerated, as aerosolized pentamidine. Dapsone-pyrimethamine also prevents first episodes of toxoplasmosis.

AIDS-Related Complex↗