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Circadian rhythm of hypertensives in a Cameroon population: a pilot study
Insights
This study on hypertensive Cameroonians found a significant nocturnal decline in blood pressure (BP). No significant sex differences in BP were observed, but 31.7% were non-dippers.
Area of Science:
- Cardiology
- Hypertension Research
- African Health Studies
Background:
- Hypertension is a significant health concern globally, particularly in African populations.
- Understanding diurnal blood pressure (BP) variations is crucial for effective hypertension management.
- Limited data exists on ambulatory BP monitoring and diurnal patterns in black hypertensive individuals in Sub-Saharan Africa.
Purpose of the Study:
- To investigate diurnal BP variations in black hypertensive Africans in Cameroon.
- To assess sex differences in ambulatory BP measurements within this population.
- To identify the prevalence of 'non-dipping' patterns in Cameroonian hypertensives.
Main Methods:
- Ambulatory BP monitoring was conducted using Spacelabs ICR Model 5300 systems.
- Systolic BP (SBP), diastolic BP (DBP), and heart rate were recorded every 30 minutes over 24 hours.
- A cohort of 69 adult hypertensive Cameroonians (aged 25-55) from a Yaounde clinic participated.
Main Results:
- No significant mean differences in 24-hour, daytime, or night-time BP were found between males and females.
- 31.7% of the study population were identified as 'non-dippers', with no observed sex difference in this subgroup.
- Significant nocturnal declines in SBP, DBP, heart rate, and mean arterial pressure were observed.
Conclusions:
- A nocturnal decline in blood pressure is present in this select Cameroonian hypertensive population.
- Ambulatory BP monitoring reveals specific diurnal patterns relevant to hypertension care in this demographic.
- Further research is warranted to explore the clinical implications of non-dipping patterns in African hypertensive patients.
Abstract:
The present study was designed to determine diurnal blood pressure (BP) variations in black hypertensive Africans in Cameroon. Also the study assessed sex differences associated with ambulatory BP measurements in this black population. A total of 69 adult Cameroonians aged 25-55 years, who attended a hypertensive clinic in Yaounde, Cameroon, were recruited on a voluntary basis. The mean ages of the males and females were 48.9 and 45.8 years, respectively. Ambulatory BP monitoring was recorded with Spacelabs ICR Model 5300 ambulatory BP monitoring systems. SBP, DBP and heart rate were measured every 30 min over a 24 h period. There were no significant mean differences observed between males and females on 24 h, daytime or night-time BPs. Among the Cameroonians, 31.7% (20 of 63) of the study population were 'non-dippers'. There were no sex difference for dippers compared with non-dippers. Significant nocturnal declines were noted for SBP, DBP, heart rate and mean arterial pressure. The results of the present study reveal that in this select Cameroonian population, there exists a nocturnal decline in BP.