May Measurement Month 2019: an analysis of blood pressure screening results from Zambia

In Zambia, hypertension accounts for the highest proportion of deaths due to cardiovascular diseases causing 3.3% of all deaths, killing an average of 670 people per year. May Measurement Month (MMM) is an annual global screening campaign aiming to improve awareness of blood pressure (BP) at the individual and population level. Adults (≥18 years) recruited through opportunistic sampling were screened at multiple sites within Lusaka during May and June 2019. Ideally, three BP readings were measured for each participant, and data on lifestyle factors and comorbidities were collected. Data were analysed centrally by the MMM project team and multiple imputations were performed where necessary. Of the total of 9232 enrolled, 8.7% of them had never had their BP measured, 2.5% had diabetes mellitus, 1.9% had had a myocardial infarction, 1.5% had had a stroke, 10.6% were current smokers, and 10.0% consumed alcohol once or more per week. Blood pressure fell from a mean of 128.6/82.9 mmHg for the 1st reading to a mean of 123.2/80.0 mmHg for the 3rd reading. The lowest proportion of participants with hypertension was identified by the 3rd reading alone (30.0%). Of all the participants, 30.7% had hypertension, though only 42.6% of them were aware of their diagnosis. Seven hundred and eighty-three (27.6%) were on antihypertensive medication though only 35.0% of them had controlled BP (systolic BP <140 mmHg and diastolic BP <90 mmHg). Compared with MMM17 data, there is deterioration of the monitored parameters calling for urgent and accelerated public health policy and clinical practice interventions. We think that the MMM campaign should continue annually to raise awareness of this treatable condition.