RESUMO
Involvement of male partners has been shown to be key for the prevention of mother-to-child HIV transmission (PMTCT). Despite the recorded success, uptake and implementation of strategies to involve men in PMTCT continues to be low in Malawi. In this study, we used the Reach Effectiveness Adoption Implementation and Maintenance (RE-AIM) implementation science framework to explore the implementation of male involvement (MI) strategies in Lilongwe, Malawi. We used a cross-sectional mixed-methods complementary-concurrent design from September to October 2020 in two health facilities. Qualitatively, we used a phenomenological approach and conducted seven focus group discussions (FGDs), three with women and four with men. We further conducted four key informant interviews (KIIs) among health care workers. Quantitatively, we conducted a cross-sectional study comprising 138 men presenting at an antenatal clinic (ANC). We used univariate analysis in Stata for the quantitative data, whereas a manual thematic analysis was applied to the qualitative data. Implementation and adoption of the strategies was high among health providers and there were indications of maintenance of the strategies. Provider's attitude, coordinated service provision, integrated training and service provision, information provision, and baby's HIV outcomes were driving factors in implementing the MI strategies. These factors have contributed to the sustained implementation of the strategies over time. In contrast, financial and time constraints, inadequate human resources, and male-friendly spaces impede the implementation of MI strategies. Improving MI will require a systems approach considering health system and individual-level factors for both providers and consumers.