Dried blood spots: a new tool for tuberculosis treatment optimization

Area of Science:

• Pharmacology and Infectious Diseases
• Clinical Chemistry and Diagnostics

Background:

• Tuberculosis (TB) remains a significant global health challenge, exacerbated by multidrug resistance and TB-HIV coinfection.
• Therapeutic drug monitoring (TDM) for anti-TB agents is increasingly recognized but hindered by conventional blood sampling logistics.
• High TB prevalence often overlaps with high HIV prevalence, posing unique challenges for patient management.

Purpose of the Study:

• To evaluate Dried Blood Spot (DBS) sampling as a viable alternative to conventional venous blood sampling for TDM in TB patients.
• To highlight the advantages of DBS in overcoming logistical challenges and facilitating TDM in resource-limited and remote settings.
• To address the specific benefits of DBS for pediatric TB and in co-infected populations.

Main Methods:

• Comparison of DBS sampling with conventional venous blood sampling for pharmacokinetic/pharmacodynamic analysis of anti-TB drugs.
• Assessment of DBS advantages including ease of collection, storage, transportation, and reduced biohazardous risk.
• Consideration of factors influencing DBS analysis method development, validation, and agreement with plasma/serum concentrations.

Main Results:

• DBS sampling offers significant logistical advantages over conventional methods, enabling TDM in remote areas.
• DBS is suitable for high HIV prevalence settings due to lower biohazardous risk and smaller blood volume requirements.
• DBS is particularly beneficial for pediatric TB and requires careful method development for accurate analysis.

Conclusions:

• Dried Blood Spot sampling presents a practical and advantageous approach for therapeutic drug monitoring in tuberculosis management.
• The adoption of DBS can expand TDM accessibility, especially in resource-limited settings and for vulnerable populations like pediatric TB patients.
• Further research is needed to optimize DBS analysis methods and fully understand its correlation with plasma/serum drug concentrations.