Blood pressure profile of primary school children in Eastern Cape province, South Africa: prevalence and risk factors

Blood Pressure Pattern and Prevalence of Hypertension amongst Apparently Healthy Primary School Pupils in Abuja, Nigeria

OBJECTIVES

The objective of this study was to determine the blood pressure (BP) pattern and prevalence of hypertension amongst apparently healthy primary school pupils in Abuja.

METHODOLOGY

This was a descriptive, cross-sectional study carried out on apparently healthy primary school children aged 6-12 years. BP was measured using a standard mercury sphygmomanometer according to standard guidelines. Data were analysed using SPSS version 17.0. Pearson's correlation coefficient (r) and analysis of variance were used to determine the relationship between BP and various variables where applicable. P = 0.05 was considered statistically significant.

RESULTS

Out of 1011 pupils recruited for the study, 457 (42.2%) were male. The mean systolic and diastolic BP (SBP and DBP) increased significantly with age from 94.5 mmHg to 101.0 mmHg and from 61.5 mmHg to 65.3 mmHg from 6 to 12 years for SBP and DBP, respectively (P < 0.05). The prevalence of high BP was 9.1%. Age was the only predictor of SBP (β = -0.629, 95% confidence interval [CI] -1.115, -0.142), while age, height and body mass index (BMI) were the predictors of DBP (β = -0.686, 95% CI of -1.152, -0.221; β = 0.490, 95% CI of 0.172, 0.809; β = 1.753, 95% CI of 0.374, 3.160) for age, height and BMI, respectively, at P < 0.05.

CONCLUSION

The predictors of SBP and DBP as shown in this study support the recommendations by various reports for taking body size into consideration in developing reference values for various populations. Age and body size are important determinants of BP in children. Its measurement should be encouraged in schools.

Prevalence of modifiable risk factors for cardiovascular disease among school-going children and adolescents in Eldoret, Kenya

Introduction

Cardiovascular disease (CVD) prevalence in Kenya is rising. Overweight, pre-hypertension and physical inactivity at younger ages is contributory. These risk factors are inadequately documented among Kenyan children and adolescents, hampering CVD prevention.

Methods

this cross-sectional study randomly sampled 384 participants from Eldoret, Kenya. After ethical considerations, physical activity was assessed. Body mass index (BMI), Waist-Hip-Ratio (WHR) and Waist-Height-Ratio (WHtR) were determined, and blood pressure (BP) was measured.

Results

participants were 14.6±2.7 years, and 62.6% were female. Eight percent had BMI ≥25.0 kg/m2. Of these, 87% were in secondary schools. Using SBP, 27.9% had CVD risk (42.5% and 20% for males and females ≥13 years and 26.5% and 27% for those <13 years, respectively). For DBP, 12.8% had elevated-to-hypertensive BP (13.2% and 8.3% for males and females ≥13 years and 11.8% and 25.4% for those <13 years, respectively). Combining SBP and DBP, 8.1%, mostly males, had elevated-to-hypertensive BP. Using respective WHR cutoffs of 0.90 and 0.85, 31% (boys) and 15.6% (girls) were at CVD risk. For WHtR, 39.6% of boys were >0.463 cut-off (0.493±0.02) against 32.4% for girls >0.469 cut-off (0.517±0.05). Of these, 52.6% (boys) and 69.7% (girls) were in secondary schools. Overall, 45% of participants were sports-inactive and 77.2% did minimal physical activities.

Conclusion

among school-going children and adolescents in Eldoret, Kenya, the prevalence of CVD risk factors was high, especially among boys and in high schools. Large proportions had elevated BP, BMI, WHR and WHtR, and, further, were sedentary, posing a high CVD risk. Lifestyle interventions to mitigate this are urgently needed.

Elevated blood pressure among children born to women with obstructed labour in Eastern Uganda: a cohort study

BACKGROUND

Globally, high systolic blood pressure accounts for 10.8 million deaths annually. The deaths are disproportionately higher among black people. The reasons for this disparity are poorly understood, but could include a high burden of perinatal insults such as birth asphyxia. Therefore, we aimed to assess the incidence of elevated blood pressure and to explore associated factors among children born to women with obstructed labour.

METHODS

We followed up children born to women with obstructed labour aged 25 to 44 months at Mbale regional referral hospital that had participated in the sodium bicarbonate trial ( Trial registration number PACTR201805003364421) between October 2021 and April 2022. Our primary outcome was elevated blood pressure defined as blood pressure (either systolic or diastolic or both) ≥ the 90th percentile for age, height, and sex in the reference population based on the clinical practice guideline for screening and management of high blood pressure in children and adolescents. We used logistic regression to estimate odds ratios between selected exposures and elevated blood pressure.

RESULTS

The incidence of elevated blood pressure was (39/140, 27.9%: 95% (CI: 20.6-36.1)). Participants aged three years and above had twice the odds of elevated blood pressure as those aged less than three years (Adjusted odds ratio (AOR) 2.46: 95% CI (1.01-5.97). Female participants had 2.81 times the odds of elevated blood pressure as their male counterparts (AOR 2.81 95% CI (1.16-6.82). Participants with reduced estimated glomerular filtration rate had 2.85 times the odds of having elevated blood pressure as those with normal estimated glomerular filtration rate (AOR 2.85 95% CI (1.00-8.13). We found no association between arterial cord lactate, stunting, wealth index, exclusive breastfeeding, food diversity and elevated blood pressure.

CONCLUSION

Our findings show a high incidence of elevated blood pressure among children. We encourage routine checking for elevated blood pressure in the pediatric population particularly those with known risk factors.

Prevalence and factors associated with hypertension among adolescents in Sudan: a cross-sectional school-based study

OBJECTIVES

There is an increasing rate of elevated blood pressure, or hypertension, in children and adolescents worldwide, including Sub-Saharan Africa (SSA). Only a few data on adolescent hypertension in SSA, including Sudan, have been published. The aim of the present study was to investigate the prevalence and associated factors of hypertension among adolescent schoolchildren (within the ages of 10 to 19 years) in Sudan.

DESIGN

A cross-sectional school-based study was conducted from June to September 2022.

SETTINGS

Six randomly selected schools in Almatamah, River Nile State, Sudan.

PARTICIPANTS

Adolescent schoolchildren (within the ages of 10 to 19 years).

MAIN OUTCOME MEASURES

Sociodemographic information. Anthropometric and blood pressure measurements were performed in accordance with the standard procedures. An adjusted logistic regression analysis was performed.

RESULTS

Of the 384 enrolled adolescents, 166 (43.2%) and 218 (56.8%) were boys and girls, respectively. The median (IQR) age and body mass index (BMI) were 15.2 years (14.0‒16.4 years) and 18.5 kg/m2 (16.4‒21.5 kg/m2), respectively. Of the 384 adolescents, 240 (62.5%) and 255 (66.4%) had educated mothers and fathers (≥secondary), respectively. 38 adolescents (9.9%) had hypertension (≥95th percentile). The multivariable logistic regression analysis revealed that age, sex and maternal educational level were not associated with hypertension. Paternal educational level according to secondary education attainment (adjusted OR (AOR), 2.72; 95% CI 1.36‒5.46) and increasing BMI (AOR, 1.12; 95% CI 1.02‒1.20) were associated with hypertension.

CONCLUSION

1 in 10 adolescents in northern Sudan was hypertensive. Low paternal educational level and increasing BMI were significantly associated with hypertension. The introduction of interventional nutritional programmes at early ages is needed to ensure that adolescents are healthy in their present and later lives. To sustain such programmes, involving all educational parties at early stage is essential.

Detecting and Managing Childhood Onset Hypertension in Africa: A Call to Action

PURPOSE OF REVIEW

To review recent evidence on childhood hypertension across Africa, identifying knowledge gaps, challenges and priorities, and highlight clinical perspectives in managing primary hypertension.

RECENT FINDINGS

Only 15 of the 54 African countries reported on absolute blood pressure (BP) measures, elevated BP, pre- and/or hypertension. The reported hypertension prevalence ranged between 0.0 and 38.9%, while elevated BP and/or pre-hypertnesion ranged from 2.7 to 50.5%. Childhood BP nomograms are lacking across Africa and the rates of hypertension were based on guidelines developed in countries with the lowest to no number of children from African ancestry. The recent studies across Africa also showed little to no detail when reporting BP specific methodology. No recent data informing the use or effectiveness of antihypertensive agents in children and adolesents are available. Childhood hypertension is on the rise, while data from Africa remains vastly under-represented. Collaborative research, resources, and policies need to be strengthened in addressing the growing public health concern of childhood onset hypertension on this continent.

Influence of puberty on relationships between body composition and blood pressure: a cross-sectional study

BACKGROUND

Fat mass (FM) and fat-free mass (FFM) are positively associated with blood pressure (BP) in youth. Yet, how puberty, independent of age, affects these relationships remains unclear. Given puberty may be a crucial period for cardiometabolic health, we examined how pubertal development moderates the associations of FM/FFM with BP.

METHODS

Pubertal development, resting BP, and body composition were assessed in a convenience sample of youth (5.5-17 years). General linear models were conducted to assess if pubertal development moderated the relationships between FM/FFM and systolic/diastolic BP standardized for age, sex, and height (SBPz/DBPz).

RESULTS

Among participants (N = 1405; age: M = 13.3 ± 2.9 years; 65.4% female; 53.2% racial/ethnic minority), FM/FFM were positively associated with SBPz and DBPz (ps ≤ 0.02). Pubertal development moderated the associations between FFM and BPz (ps ≤ 0.01), but not FM (ps > 0.43). For early/mid and late pubertal participants, there were positive associations between FFM and BP (DBPz: βs = 0.10-0.18, ps ≤ 0.01; SBPz: βs = 0.33-0.43, ps < 0.001); however, these relationships were attenuated, especially for prepubertal DBPz (DBPz: β = 0.01, p = 0.91; SBPz: β = 0.24, p = 0.001).

CONCLUSIONS

Puberty moderated the relationships between FFM and SBPz/DBPz in analyses that separately modeled the contributions of age and sex. These data suggest that the FFM-DBPz association may potentially be impacted by increasing sex hormone concentrations during puberty.

IMPACT

Fat mass (FM) and blood pressure (BP) were positively associated throughout puberty. Fat-free mass (FFM) and BP were positively associated throughout puberty; however, puberty moderated the FFM-BP relationship, such that there was a positive relationship in early/mid and late puberty, but the relationship was attenuated for prepubertal children. These findings contribute further insight into physiological and cardiometabolic changes occurring during puberty. Changes in hormone concentrations may explain the impact puberty has on the FFM-BP relationship. Understanding predictors of BP are important as childhood BP is associated with future cardiometabolic outcomes.