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Impact of injecting drug use on mortality in Danish HIV-infected patients: a nation-wide population-based cohort study

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Abstract:

ABSTRACT Objectives 

To estimate the impact of injecting drug use (IDU) on mortality in HIV-infected patients in the highly active antiretroviral therapy (HAART) era. Design 

Population-based, nation-wide prospective cohort study in Denmark (the Danish HIV Cohort Study). Methods 

A total of 4578 HIV-infected patients were followed from 1 January 1997 or date of HIV diagnosis. We calculated mortality rates stratified on IDU. One-, 5- and 10-year survival probabilities were estimated by Kaplan–Meier methods, and Cox regression analyses were used to estimate mortality rate ratios (MRR). Results 

Of the patients, 484 (10.6%) were categorized as IDUs and 4094 (89.4%) as non-IDUs. IDUs were more likely to be women, Caucasian, hepatitis C virus (HCV) co-infected and younger at baseline; 753 patients died during observation (206 IDUs and 547 non-IDUs). The estimated 10-year survival probabilities were 53.2% [95% confidence interval (CI): 48.1–58.3] in the IDU group and 82.1% (95% CI: 80.7–83.6) in the non-IDU group. IDU as route of HIV infection more than tripled the mortality in HIV-infected patients (MRR: 3.2; 95% CI: 2.7–3.8). Adjusting for potential confounders did not change this estimate substantially. The risk of HIV-related death was not increased in IDUs compared to non-IDUs (MRR 1.1; 95% CI 0.7–1.7). Conclusions 

Although Denmark's health care system is tax paid and antiretroviral therapy is provided free of charge, HIV-infected IDUs still suffer from substantially increased mortality in the HAART era. The increased risk of death seems to be non-HIV-related and is due probably to the well-known risk factors associated with intravenous drug abuse.

Keywords: Cohort studies; HIV; HIV infection; injecting drug use; intravenous; mortality; substance abuse; survival; survival rate

Document Type: Research Article

DOI: https://doi.org/10.1111/j.1360-0443.2009.02827.x

Affiliations: 1: Department of Infectious Diseases, Rigshospitalet, Copenhagen, Denmark, 2: Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark and 3: Department of Infectious Diseases, Kolding Hospital, Kolding, Denmark 4: Department of Infectious Diseases, Copenhagen University Hospital, Hvidovre, Denmark,

Publication date: 2010-03-01

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