Intention to adhere to HIV treatment: a patient-centred predictor of antiretroviral adherence

OBJECTIVES

Despite the effectiveness of highly active antiretroviral therapy (HAART), HIV remains a major cause of mortality in the USA, largely as a result of poor HIV treatment adherence. In this study we assessed the association between five patient-centred factors and adherence to HIV treatment.

METHODS

We surveyed 244 adults at two HIV clinics in Houston, Texas between October 2009 and April 2010. Participants were given a questionnaire and their charts were reviewed for clinical data. Survey items assessed the following factors: self-assessed HIV knowledge, awareness of disease biomarkers, intention to adhere to HIV treatment, health literacy and decision-making style. The primary outcome measure was HAART adherence during the previous month. Logistic regressions were performed to calculate the effect of each factor on adherence.

RESULTS

All participants had HIV/AIDS and were on HAART at enrolment. Eight per cent of participants were female, 57% were African-American and 16% were Hispanic. Mean age was 58.1 years. Sixty-eight per cent were adherent to HAART during the last month. On univariate analysis, a preference for wanting choices, correct knowledge of recent HIV viral load level, and intention to adhere to HIV treatment were significantly associated with adherence. On multivariate analysis, only intention to adhere to HIV treatment remained statistically significant after adjusting for other factors (odds ratio 2.2; 95% confidence interval 1.1 to 4.3).

CONCLUSIONS

Intention to adhere to HIV treatment was significantly associated with self-reported adherence to HAART. Interventions that bolster patients' intentions to adhere to HIV treatment during clinical encounters may improve adherence to HAART and HIV control.

Bacteriophages are synergistic with bacterial interference for the prevention of Pseudomonas aeruginosa biofilm formation on urinary catheters

AIMS

We hypothesized that pretreating urinary catheters with benign Escherichia coli HU2117 plus an antipseudomonal bacteriophage (ΦE2005-A) would prevent Pseudomonas aeruginosa biofilm formation on catheters--a pivotal event in the pathogenesis of catheter-associated urinary tract infection (CAUTI).

METHODS AND RESULTS

Silicone catheter segments were exposed to one of four pretreatments (sterile media; E. coli alone; phage alone; E. coli plus phage), inoculated with P. aeruginosa and then incubated up to 72 h in human urine before rinsing and sonicating to recover adherent bacteria. Pseudomonas aeruginosa adherence to catheters was almost 4 log(10) units lower when pretreated with E. coli plus phage compared to no pretreatment (P < 0.001) in 24-h experiments and more than 3 log(10) units lower in 72-h experiments (P < 0.05). Neither E. coli nor phage alone generated significant decreases.

CONCLUSIONS

The combination of phages with a pre-established biofilm of E. coli HU2117 was synergistic in preventing catheter colonization by P. aeruginosa.

SIGNIFICANCE AND IMPACT OF THE STUDY

We describe a synergistic protection against colonization of urinary catheters by a common uropathogen. Escherichia coli-coated catheters are in clinical trials; adding phage may offer additional benefit.

A bacterial interference strategy for prevention of UTI in persons practicing intermittent catheterization

Study Design

Non-randomized pilot trial

Objectives

Determine whether Escherichia coli 83972-coated urinary catheters in persons with spinal cord injury (SCI) practicing an intermittent catheterization program (ICP) could (1) achieve bladder colonization with this benign organism, and (2) decrease the rate of symptomatic urinary tract infection (UTI).

Setting

Outpatient SCI clinic in a Veterans Affairs hospital (USA)

Methods

Participants had neurogenic bladders secondary to SCI, were practicing ICP, had experienced at least 1 UTI, and had documented bacteruria within the past year. All subjects received a urinary catheter that had been pre-inoculated with E. coli 83972. The catheter was left in place for 3 days then removed. Subjects were followed with urine cultures and telephone calls weekly for 28 days and then monthly until E. coli 83972 was lost from the urine. Outcome measures were (1) the rate of successful bladder colonization, defined as the detection (≥10² cfu/ml) of E. coli 83972 in urine cultures for > 3 days after catheter removal and (2) the rate of symptomatic UTI while colonized with E. coli 83972.

Results

Thirteen subjects underwent 19 insertions of study catheters. Eight subjects (62%) became successfully colonized for > 3 days after catheter removal. In these 8 subjects, the rate of UTI while colonized was 0.77 per patient-year, in comparison to the rate of 2.27 UTI per patient-year prior to enrollment.

Conclusions

E. coli 83972-coated urinary catheters are a viable means to achieve bladder colonization with this potentially protective strain in persons practicing ICP.

Proteus bacteriuria is associated with significant morbidity in spinal cord injury

STUDY DESIGN

Retrospective chart review.

OBJECTIVES

We investigated the morbidity associated with Proteus bacteriuria in a spinal cord injured (SCI) population.

SETTING

Michael E DeBakey Veterans Affairs Medical Center in Houston, Texas, USA.

METHODS

We reviewed the medical records of all veterans with SCI who received care in our medical center during the past 3 years. Proteus bacteriuria was defined as the growth of Proteus species in any urine culture during the study period. Urinary stones were defined as either renal or bladder calculi.

RESULTS

During the study period, 71 of the 501 subjects (14%) had Proteus and 90 (18%) had urinary stones. Twenty-seven percent of the subjects with Proteus had stones, and the association of Proteus with stones was significant (P<0.05). Proteus bacteriuria was likewise associated with complete injury, hospitalization, decubitus ulcers, and history of stones (P<0.001). Subjects using indwelling catheters, either transurethral or suprapubic, were significantly more likely to have Proteus, whereas subjects practising spontaneous voiding and clean intermittent catheterization were significantly less likely to have Proteus. In the 90 patients with stones, Proteus was associated with requiring treatment for stones and having multiple stones (P<0.01). Twenty-five of the 90 patients with stones (28%) required treatment, most often with lithotripsy, and 6 (7%) developed urosepsis.

CONCLUSIONS

In persons with SCI, Proteus was found in subjects with a greater degree of impairment who were more likely to be hospitalized, to have decubiti, and to use indwelling catheters. Bacteriuria with Proteus predicted urologic complications in persons with SCI. STATEMENT OF ETHICS: All applicable institutional and governmental regulations concerning the ethical use of human volunteers were followed during the course of this research.

Tuberculous pericarditis: optimal diagnosis and management

Pericarditis is a rare manifestation of tuberculous disease. The appropriate diagnostic workup and optimal therapeutic management are not well defined. We present 10 new cases of tuberculous pericarditis and review the relevant literature. The specific topics addressed are (1) the importance of tissue for diagnosis, (2) the optimal surgical management, (3) the role of corticosteroids, and (4) the impact of human immunodeficiency virus (HIV) on the management of this disease. The cases and the literature suggest that the optimal management includes an open pericardial window with biopsy, both for diagnosis and to prevent reaccumulation of fluid. Corticosteroids probably offer some benefit in preventing fluid reaccumulation as well. The data are inconclusive regarding whether open drainage or corticosteroid use prevents progression to constrictive pericarditis. No studies have addressed these issues specifically in HIV-positive patients, but the 3 HIV-positive patients in our series had an excellent response to drainage and antituberculous therapy.