Cardiovascular-Kidney-Metabolic Syndrome: Why Doctors Now Link the Heart, Kidneys and Metabolism

Why medicine started treating these conditions together

For most of the last century, heart disease, kidney disease and diabetes were handled by different specialists using different guidelines. Practice has been catching up with a pattern that clinicians see every day: a person with type 2 diabetes is also much more likely to have high blood pressure, kidney damage and cardiovascular disease, and each of those conditions makes the others worse. Weight and the way the body handles energy sit underneath all of them.

In 2023, the American Heart Association published a Presidential Advisory in the journal Circulation that gave this overlap a name, cardiovascular-kidney-metabolic health, and defined a syndrome that results from the interplay of metabolic risk factors, chronic kidney disease and the cardiovascular system. A guideline from the AHA, the American College of Cardiology, the American Diabetes Association and the American Society of Nephrology followed in 2026, and it is the first US guideline to treat weight, blood pressure, lipids, glucose and kidney function as one syndrome.

The significance is partly practical. Someone who has a high blood pressure reading is more likely to be asked about glucose and kidney function, and someone who learns that their kidney function is reduced is more likely to have their cardiovascular risk looked at, because the framework treats the number in front of them as one of several linked ones.

The five stages in the 2023 advisory

The advisory describes CKM syndrome as a progression, from the absence of risk factors to established cardiovascular disease. The stages are meant to help clinicians match the intensity of prevention to where a person sits, and they emphasize that the earlier stages are the best opportunity to change the course.

Two features of the staging are worth noticing. First, the early stages are defined by risk and by body composition rather than by established disease, which reflects the view that the condition begins long before a heart attack or kidney failure. Second, stage 4 is not the end of the framework: the advisory also distinguishes whether kidney failure is present, because it changes how the cardiovascular disease is managed.

How the three systems feed each other

The reasoning behind a combined syndrome is that each system affects the others in both directions, so that treating one in isolation misses part of the picture.

• Excess body fat and insulin resistance raise blood pressure, worsen lipids and push glucose upward, which injures blood vessels and the delicate filters in the kidneys.
• High blood pressure damages the kidneys over time, and reduced kidney function in turn raises blood pressure, because the kidneys help regulate fluid and salt.
• Diabetes is the leading cause of kidney failure and also accelerates atherosclerosis, the build-up of plaque in the arteries.
• Reduced kidney function increases cardiovascular risk independently of other factors, which is one reason kidney function is built into modern risk equations.
• Heart failure reduces blood flow to the kidneys, which can reduce their function, and this in turn makes fluid management harder.

That last point about kidney function appearing in risk calculation is concrete. The PREVENT equations from the American Heart Association, which replaced the older Pooled Cohort Equations in US guidelines, take eGFR as an input, which is why a kidney number now appears in a cardiovascular risk estimate.