Emergency care units (ECUs) in Senegal are critical for managing acute health conditions promptly. However, their effectiveness and efficiency have not been systematically evaluated. A mixed-methods approach was employed including quantitative data analysis from patient records and qualitative interviews with healthcare providers. The study utilised a matched-pair comparison design to ensure comparability between ECU sites. Among the evaluated ECUs, Unit A in Dakar demonstrated significantly better clinical outcomes compared to Units B and C in other regions (p < 0.05). The study underscores the need for standardised training programmes and resource allocation strategies across all ECU sites. Immediate implementation of evidence-based guidelines is recommended to enhance patient care and reduce disparities between ECUs. Emergency Care Units, Senegal, Quasi-Experimental Design, Clinical Outcomes Treatment effect was estimated with $\text{logit}(p_i)=\beta_0+\beta^\top X_i$, and uncertainty reported using confidence-interval based inference.