Abstract
Background
Isolated nocturnal hypertension (INH) is associated with increased prevalence of left ventricular hypertrophy (LVH) and cardiovascular morbidity and mortality in adult patients. Unlike in adults, data illustrating the possible association between INH and cardiac target organ damage is lacking in children. This study aimed to investigate whether INH is associated with increased left ventricular mass index (LVMI) and LVH in children.
Methods
Retrospective data from all untreated children with confirmed ambulatory hypertension (HT) in our center was reviewed. Ambulatory blood pressure monitoring (ABPM) and echocardiography were performed concurrently. Ambulatory normotensive children served as controls. LVH was defined as LVMI ≥ 95th percentile.
Results
There were 102 ABPM studies; of these, 79 children had renal HT, and 23 had primary HT. Median age of children was 13.2 years (3.8–18.9). Nineteen children had INH, 9 children had isolated daytime HT, 54 had daytime and nighttime HT, and 20 were normotensive. The LVMI adjusted for age (patient’s LVMI/95th percentile of the LVMI) was significantly higher in children with INH than in normotensive children (0.83 ± 0.03 vs. 0.74 ± 0.03, p = 0.03). Left ventricular hypertrophy was present in 11% of children with INH; this was not significantly higher than in normotensive children (0%, p = 0.23).
Conclusions
This study investigated the association between INH and cardiac structure in children with primary and renal HT and showed children with INH had higher LVMI adjusted for age than normotensive children and children with INH had similar LVMI adjusted for age to children with isolated daytime HT.
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Acknowledgments
We thank our colleagues for performing some of the ABPM studies and Redina Hasani and Mairead Pfaff for their contribution as the scientific English language editors.
Funding
This work was funded by the project of Ministry of Health, Czech Republic, for conceptual development of research organization 00064203 (University Hospital Motol, Prague, Czech Republic) and by the National Sustainability Program I (NPU I) Nr. LO1503 provided by the Ministry of Education Youth and Sports of the Czech Republic.
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Ethical approval was waived by local Ethics Committee of University Hospital Motol in view of the retrospective nature of the study, and all the procedures being performed were part of the routine care. The prospective blood pressure and echocardiography investigation of healthy children was approved by the local Ethics Committee and the parents signed their informed consent with the study.
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Seeman, T., Hradský, O. & Gilík, J. Isolated nocturnal hypertension is associated with increased left ventricular mass index in children. Pediatr Nephrol 36, 1543–1550 (2021). https://doi.org/10.1007/s00467-020-04861-4
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DOI: https://doi.org/10.1007/s00467-020-04861-4