Why Memory Matters After Heart Surgery
Imagine waking up from heart surgery and noticing you’re more forgetful. You might misplace your keys more often or struggle to find the right word. This is a real concern for many older adults who have coronary artery bypass graft (CABG) surgery.
CABG is a common procedure to improve blood flow to the heart. But what if it also affects the brain?
A new study looked at whether this surgery is linked to memory problems, like mild cognitive impairment or dementia. The researchers also explored how a gene called APOE might play a role.
The Overlap of Heart and Brain Health
Coronary artery disease (CAD) is very common in people over 60. It happens when the arteries that supply blood to the heart become narrow or blocked. CABG surgery is often used to fix this.
But CAD and memory problems share many risk factors. These include high blood pressure, diabetes, and even genetics. This makes it hard to know if surgery itself is a risk.
Right now, we don’t fully understand the link between CABG and memory issues. This study aimed to find out more.
A New Look at Old Data
In the past, studies on this topic had mixed results. Some found a link between CABG and memory problems, while others did not. This new study is different because it looked at a large group of people and adjusted for many factors.
The researchers used data from the All of Us Research Program. This is a huge database with health information from people across the United States.
They focused on adults aged 60 and older with CAD. They compared those who had CABG surgery to those who did not. They also looked at the APOE gene, which is linked to dementia.
Think of the APOE gene like a key that helps clear waste from the brain. There are different types of this key. One type, APOE4, is well-known for raising dementia risk. But this study focused on another type, APOE2.
APOE2 is often thought to be protective. But in this study, it seemed to change how the brain handles stress from surgery.
The researchers used statistical models to adjust for things like age, sex, and other health conditions. This helped them isolate the effect of CABG.
Who Was Studied?
The study included 22,349 adults with CAD. About 40% were women, 70% were White, 12% were Black, and 9% were Hispanic.
Among them, 8,135 had CABG surgery, and 14,214 did not. The researchers tracked who developed memory problems until 2023.
The results were clear. People who had CABG surgery were more likely to have memory problems than those who did not.
About 5.1% of CABG patients had memory issues, compared to 3.5% of non-CABG patients. This difference was statistically significant.
After adjusting for other factors, CABG was still linked to a 23% higher risk of memory problems.
But here’s the twist: the link was strongest in people with the APOE2/3 gene type. In this group, the risk was nearly doubled.
This is where things get interesting.
The APOE2/3 group had a 91% higher risk of memory problems after CABG. This suggests that genetics may play a bigger role than we thought.
This study adds to a growing body of evidence linking heart surgery to brain health. It highlights the importance of considering genetics when assessing risk.
However, it’s important to note that this study does not prove that CABG causes memory problems. It only shows an association.
If you or a loved one is considering CABG surgery, talk to your doctor about the risks and benefits. Ask about your genetic risk factors, especially if you have a family history of dementia.
This doesn’t mean this treatment is available yet.
The study is based on observational data, which can’t prove cause and effect. More research is needed to confirm these findings.
Next, researchers will need to conduct clinical trials to see if changing surgical techniques or adding brain-protective strategies can reduce the risk. For now, this study is a reminder that heart and brain health are closely connected.
