For generations, high blood pressure was considered an adult disease. Routine blood pressure checks in children were exceptional, and pediatricians tended to interpret high readings as temporary anomalies, the result of nervousness or growth. Today, that vision has radically changed.

The scientific evidence accumulated in the last twenty years points in an unequivocal direction: children who have high blood pressure have a significantly higher risk of dying from cardiovascular causes before reaching the age of 60.

A study published in 2023 in the Journal of the American College of Cardiology, which followed more than 68,000 participants from childhood for more than three decades, concluded that those who registered high blood pressure between the ages of 7 and 17 multiplied by 2.4 their probability of suffering a fatal cardiovascular event in young adulthood, compared to their peers with normal blood pressure. The results were maintained even after adjusting variables such as adult weight, smoking or socioeconomic level.

Damage that begins before symptoms

The biology behind this relationship is clearer than it seems. High blood pressure subjects the arterial walls to constant mechanical stress. In adults, this process takes decades to produce visible consequences. In children, whose vascular system is in full development, the damage is structural from the beginning: the vessels become less elastic, the left ventricle of the heart begins to hypertrophy and the intimate layer of the arteries accumulates subclinical lesions that, over the years, evolve into arteriosclerosis.

Researchers from the Bogalusa Heart Study, one of the world's longest-running epidemiological studies of childhood cardiovascular health, documented revealing findings in autopsies of young people who died from accidents: those who had hypertension in childhood showed fatty streaks and fibrous plaques in the coronary arteries much more frequently than those who had normal blood pressure. "Atherosclerotic disease begins in childhood. Not in middle age," the researchers concluded.

Recent meta-analyses estimate that approximately 40% of hypertensive children will remain hypertensive as adults. But even those who “normalize” their blood pressure in adulthood continue to show a less favorable cardiovascular profile than those who always had normal blood pressure, suggesting that the damage accumulated during childhood is not completely erased.

The phenomenon of tensional tracking

One of the concepts that best explains the behavior of childhood hypertension is blood pressure tracking. This principle states that children who are in the highest blood pressure percentiles for their age tend to remain in those percentiles throughout adolescence and adulthood. This is not a statistical coincidence: it reflects the persistence of biological, genetic and environmental factors that consolidate a high blood pressure trajectory.

Recent meta-analyses estimate that approximately 40% of hypertensive children will remain hypertensive as adults. But even those who “normalize” their blood pressure in adulthood continue to show a less favorable cardiovascular profile than those who always had normal blood pressure, suggesting that the damage accumulated during childhood is not completely erased.

An invisible problem, a complex diagnosis

If science is clear about the problem, clinical practice has not yet provided a sufficient answer. Pediatric hypertension is defined in a more complex way than in adults: there is no single threshold, but rather normal values ​​depend on the age, sex and height of the child. This requires the use of percentile tables and careful measurement, under standardized conditions, which many primary care practices cannot always guarantee.

Studies in Europe and Latin America indicate that up to 70% of pediatric hypertension cases are not detected during routine check-ups. “White coat hypertension”—a temporary increase in tension due to anxiety before the appointment—further complicates the diagnosis and can lead both to overdiagnosis and, paradoxically, to real hypertension being misinterpreted. Ambulatory blood pressure monitoring for 24 hours is established as the reference method to overcome these limitations.

Intervene in childhood

The other side of this panorama is encouraging. Unlike adults, whose vascular lesions are frequently irreversible, the hypertensive child diagnosed in time has a window of high-impact intervention before them. Lifestyle modifications—reducing sodium intake, regular physical activity, weight control, and eliminating ultra-processed foods from the diet—manage to normalize blood pressure in most cases of childhood primary hypertension without the need for drugs.

Specialists emphasize that each year of untreated hypertension in childhood is equivalent to accelerating vascular aging. On the contrary, each year of adequate blood pressure control at an early age translates into healthier arteries, a lower risk of heart attack and stroke, and, ultimately, years of life gained.

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