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Adaptive Viral Load Monitoring Frequency to Facilitate Differentiated Care: A Modeling Study From Rakai, Uganda.
Victor Ssempijja1, Martha Nason2, Gertrude Nakigozi3
1Clinical Monitoring Research Program Directorate, Clinical Research Directorate, Frederick National Laboratory for Cancer Research sponsored by the National Cancer Institute, Frederick, Maryland, USA.
Summary
Reducing viral load monitoring frequency using adaptive strategies can significantly cut costs in resource-limited settings. This approach maintains patient care by minimizing increases in undetected treatment failure during antiretroviral therapy (ART).
Area of Science:
- Public Health
- Infectious Diseases
- Health Economics
Background:
- Antiretroviral therapy (ART) scale-up necessitates efficient monitoring strategies.
- Routine viral load monitoring is standard, but cost-saving opportunities exist in resource-limited settings.
- Investigating reduced monitoring frequency is crucial for sustainability.
Purpose of the Study:
- To evaluate if viral load monitoring frequency can be reduced without compromising the detection of treatment failure.
- To compare the cost-effectiveness of different viral load monitoring schemes.
Main Methods:
- A simulation model was developed using data from 2489 individuals on ART.
- Weibull regression models were used to predict time to treatment failure (viral load >1000 copies/mL).
- Five adaptive monitoring schemes were compared against biannual and annual monitoring over 5 years for 10,000 simulated individuals.
Main Results:
- Adaptive monitoring schemes significantly reduced viral load tests compared to routine biannual or annual testing.
- The best adaptive scheme decreased viral load measurements by 67% with less than a 20% increase in undetected failure.
- While 6-monthly monitoring detected failure fastest, it required the most tests.
Conclusions:
- Adaptive viral load monitoring, informed by previous results, offers an optimal balance between cost reduction and patient care.
- This approach can enable wider access to treatment and monitoring.
- Further empirical studies are recommended to validate differentiated monitoring strategies.
