Cardiovascular Risk Burden Assessed by China-PAR Score and Its Link to Cognitive Performance in Older Adults: A Cross-Sectional Study

The human brain and the heart are often discussed as separate organs, one governing thought and the other pumping lifeblood. Yet, in the quiet machinery of the body, they are deeply intertwined. For decades, doctors have known that conditions like high blood pressure, diabetes, and high cholesterol damage the heart, but a growing body of evidence suggests these same factors also wear down the brain. When the vessels that feed the brain become stiff or blocked, the organ may not receive the steady flow of oxygen and nutrients it needs to maintain sharp memory and quick thinking. This connection is particularly urgent as the global population ages; finding ways to spot those at risk for cognitive decline before symptoms appear could help preserve independence and quality of life for millions.

Researchers in Tianjin, China, recently set out to test this link using a tool designed specifically for their population. They focused on a group of 733 older adults living in their own homes, none of whom were older than 85. The team wanted to see if a person's overall "cardiovascular risk burden"—a score that combines factors like age, blood pressure, smoking history, and cholesterol levels—could predict how well their brain was working at that moment. Instead of looking at just one risk factor, such as high blood pressure alone, they used a comprehensive model called the China-PAR score. This model calculates a person's ten-year risk of developing atherosclerotic cardiovascular disease, a condition where arteries harden and narrow. By treating this risk score as a single number representing the total strain on the body's vascular system, the researchers could ask a simple but profound question: do people with higher cardiovascular risk scores show lower scores on tests of intelligence and memory?

To answer this, the team invited participants to a series of assessments that measured both their physical health and their mental sharpness. The physical exams included measuring blood pressure, waist size, and blood samples to check cholesterol and sugar levels. These data points were fed into the China-PAR model to generate a risk percentage for each person. Simultaneously, trained neurologists administered a detailed cognitive test known as the Wechsler Adult Intelligence Scale–Revised in China. This test is like a comprehensive audit of the mind, broken down into eleven different tasks. Some tasks asked participants to define words, solve arithmetic problems, or explain proverbs, tapping into their verbal knowledge and reasoning. Others required them to arrange pictures in a logical story, copy complex geometric patterns, or match symbols to numbers, which tested their ability to process visual information and move their hands quickly.

The results revealed a clear and consistent pattern. The researchers found that as the cardiovascular risk score went up, the scores on the cognitive tests went down. This relationship held true even after the team carefully adjusted for other factors that are known to influence intelligence, such as how many years of education a person had received, their body mass index, and their genetic makeup regarding a specific protein called APOE. In other words, the link between a heavy cardiovascular burden and a struggling brain was not simply because the participants had less schooling or different body types; the risk itself appeared to be the driving force.

When the researchers looked closer at the specific parts of the cognitive test, the picture became even more detailed. The negative association was strongest in areas that rely on speed and visual-spatial skills. Tasks that required participants to quickly match symbols, arrange pictures in a sequence, or build patterns with blocks showed the most significant decline in people with higher risk scores. These are the kinds of mental activities that depend on the brain's ability to process information rapidly and organize visual details. Interestingly, the connection was weaker or non-existent for tasks that relied heavily on long-term memory or abstract verbal reasoning, such as recalling similarities between two objects or holding a string of numbers in short-term memory. This suggests that the early signs of vascular strain might first show up in how fast the brain can work and how well it can navigate visual space, rather than in the deep reservoirs of knowledge a person has accumulated over a lifetime.

The study, which was conducted across several neighborhoods in Tianjin, included a large number of women, reflecting the demographics of the community they recruited from. While the findings are compelling, the researchers are careful to note that because this was a snapshot in time—a cross-sectional study—they cannot prove that the heart risk caused the cognitive changes. It is possible that early brain changes could influence lifestyle choices that then affect heart health, or that an unmeasured factor is influencing both. However, the strength of the association, which remained significant even after rigorous statistical adjustments, provides strong evidence that the health of the blood vessels and the health of the mind are moving in tandem.

Ultimately, this work suggests that a single number, representing a person's total risk for heart disease, might serve as a useful warning sign for their brain health. If a community-dwelling older adult has a high China-PAR score, they may also be showing signs of lower performance in processing speed and visual reasoning. This does not mean that a high score guarantees cognitive decline, but it does highlight a group of people who might benefit from closer monitoring. The researchers conclude that while their findings offer a valuable clue, future studies that follow people over many years are needed to confirm the cause-and-effect relationship and to understand exactly how the damage travels from the heart to the mind. Until then, the message remains clear: protecting the heart may be one of the most effective ways to protect the mind.