Prevention of Mother-to-Child Transmission of HIV (PMTCT) is a key strategy in the global AIDS response towards elimination of HIV and AIDS by 2030 [1] . Since the launch of the elimination of mother-to-child transmission of HIV initiative (eMTCT) countries such as Cuba, Armenia, Belarus and Thailand have eliminated mother-to-child transmission of HIV (MTCT) [2] [3] . To achieve elimination breastfeeding, countries need to have MTCT rates 5% or below; non-breastfeeding populations need to sustain MTCT rates of 2% or below [4] . Africa, where the majority of countries are breastfeeding countries, has so far been unable to achieve and maintain an MTCT rate of 5% and below. Zimbabwe has managed to reduce MTCT rate to 6.7%, due to effective PMTCT program. However, the program is impeded by poor retention rates. A 2012 survey in Zimbabwe found an attrition rate of 43%, along the PMTCT cascade [5] . Attrition in PMTCT is usually due to loss to follow up and death. Both of the two are associated with missed PMTCT appointments.

Countries are aiming to achieve the 90-90-90 targets by 2020. According to the targets, by the year 2020, 90% of people with HIV should know their status and 90% of people diagnosed with HIV infection should be on lifelong antiretroviral therapy. The last 90 in the 90-90-90 strategy aims to have 90% on ART having viral suppression [6] . Missed PMTCT and HIV care visits may stall progress towards elimination of HIV by increasing resistance to antiretroviral medicine and worsening clinical, virologic and immunonologic outcomes. It also increases treatment costs as individuals get managed on relatively expensive second line or third line ARV medicine [7] [8] . About 35% of adults with HIV in Zimbabwe are reported to be on second line ARV drugs.

Many innovative strategies have been used to improve retention in PMTCT, hence reduce the frequency of missed visits. The retention interventions can be health centre based or community-based. In a 2016 systematic review of interventions to improve retention, identified strategies to improve retention in PMTCT included task-shifting to enable nurses to prescribe antiretroviral drugs, integrating PMTCT services in antenatal clinics (ANC), quality improvement at health centres, CD4 testing at health centres, facility-based peer support, encouraging male partner support and using cell phone reminders [9] . Incentives, reinforcement, mobile phone education, laboratory courier for CD4 samples and education of midwives were also proved to improve retention in PMTCT [10] .

Despite all these interventions being implemented in most settings, retention remains poor [11] . There is also little documented evidence of missed visits and their correlates in public PMTCT programs, including predictors of missed visits in such settings. More so, the evidence is lacking since the world Health Organization recommended the PMTCT Option B plus and, recently, the test and treat strategy. The purpose of this study was to determine the prevalence of missed PMTCT visits and determine programmatic PMTCT predictors of missed visits.

The pilot study was conducted through a descriptive survey method in October 2016. Two questionnaires were administered. Both questionnaires had closed-ended items. They were administered to randomly selected women enrolled in PMTCT at Makumbe District Hospital, Zimbabwe. The study site was purposively selected for having a diverse catchment area, which included rural and urban population. Randomization was achieved through coin flipping. Only women enrolled in PMTCT Option B plus at the site and could understand either English or the vernacular Shona language were approached. Women who were enrolled in the Option B program or who visited the PMTCT centre for emergency supply of antiretroviral drugs [ARVs] were excluded from the study. A total of 53 women were selected to participate in the study. The sample size was based on the central limit theorem [12] . The study was then explained, including the concept of voluntary consent. Participants proceeded to complete the questionnaire after giving voluntary documented consent. Participant visit information was obtained from respective OI/ART (Opportunistic Infections antiretroviral therapy) registers. The main outcome measures were missed PMTCT visits and number of days by which scheduled visits were missed.

The study observed ethical principles according to the Nuremberg code. The investigator had a valid competence in ICH-GCP (International Conference on Harmonization―Good Clinical Practice). Approval to conduct the study was granted by both the J REC (Joint Research Ethics Committee for University of Zimbabwe College of Health Sciences and Parirenyatwa Group Hospitals) and The Medical research Council of Zimbabwe (MRCZ). Data were analyzed for descriptive statistics and both multiple linear and multiple logistic regression using STATA software.

Findings from this study showed that 24.5% of the women missed a scheduled visit. Satisfaction with the PMTCT programme at the health centre and family support were associated with not missing a PMTCT visit. Not surprisingly, participants who had just been commenced on PMTCT, that is, with few PMTCT visits were more likely to miss a scheduled visit by more days.

In this study 24.5% participants missed the scheduled PMTCT visit. This was a lower figure than in a national survey whereby 43% were lost to follow up by the time of the third drug pick up [5] . However, missing a single PMTCT visit can neither be directly inferred to retention in PMTCT nor to attrition. In this study, peer support and community health worker support were not statistically significant predictors of missed visits. This is not surprising since most community interventions have not been proven to improve retention in PMTCT [13] . For instance, use of community health workers, counselling in the community and HIV disclosure [14] [15] . This may be possible because the interventions tended to give women in PMTCT a passive role in the programme. In this study, participants had not received support: 66% were not members of a PMTCT support group, 73.6% had received no peer support, 90.6% had received no cash

motivation, and 71.7% had no cell phone reminders. This may imply that coming for scheduled PMTCT visits is much of individual effort. Surprisingly, a study in South Africa found that by six weeks after delivery, 24% women had missed a PMTCT visit [16] .

In this study, 35.8% participants had complete satisfaction with PMTCT services. This was a low figure compared to a study in Dar es Salaam where 61% had very good satisfaction. In the Dar es Salaam study, predictors of dissatisfaction included long waiting times, poor comprehension of patient needs and poor interpersonal skills of health workers [17] . In the current study, consultation rooms were quite small and did not offer privacy as other women could overhear conversations between clinicians and patients. Moreover, the consultation began in an open tent, which, however, provided a conducive opportunity for peer interaction. This may imply that women in PMTCT prefer privacy and are somewhat selective on whom to interact with. This may also be supported by the fact that peer support was not a statistically significant predictor of missed visits.

Statistically significant predictors for not missing visits were participants’ satisfaction with family support and satisfaction with PMTCT services at the hospital. In this study, 90.6% were satisfied with family support and 69.8% were satisfied with community support. The findings contrast with a Haitian study whereby socio-demographics were not predictors of retention in care [18] . A Zimbabwean study also did not find a statistically significant improvement in retention of women after engaging facility-based peer support groups [19] . In the current study, participants may have wanted family acceptance to come for scheduled visits. PMTCT benefits the family, in part, by reducing vertical transmission of HIV to the child. Elsewhere, satisfaction with facility PMTCT services has been shown to improve retention. The coefficient of determination of 11% in the current study implies that there are other predictors responsible for 89% of variance in missed visits.

However, the statistical power in the current study may have been compromised by the small sample size. The study was also done in a single month, which might have produced a selection bias.

Family support and satisfaction with the handling of the PMTCT program may reduce the likelihood of missed PMTCT visits. Women tend to have more missed days in the later days of the PMTCT cascade. A more comprehensive PMTCT site assessment is required. The site assessment may include site retention strategies and the presence of a sustainable PMTCT model capable of retaining women in PMTCT. Hence, reducing the frequency of missed visits may facilitate understanding of health care and community predictors of missed visits. Lastly, a qualitative study to explore the reasons why women miss scheduled PMTCT later after enrollment into the PMTCT programme, may be done to explain patient fatigue along the PMTCT cascade.

The authors would like to acknowledge the Provincial Medical Director, Mashonaland East Province and the District Medical Officer, Goromonzi for their support in data collection. This work is supported by the Norwegian Agency for Capacity Development (NORHED).

Ndaimani, A., Chitsike, I., Haruzivishe, C. and Stray-Pedersen, B. (2017) Missed Prevention of Mother-to-Child Transmission of HIV (PMTCT) Visits and Associated Programmatic Predictors: A Pilot Study. Advances in Infectious Diseases, 7, 107-117. https://doi.org/10.4236/aid.2017.74011