CARDIOLOGY DOCTOR NEAR TO ME Why is heart failure affecting my mood........ We know that heart failure can reduce the rate at which oxygen-rich blood is pumped around the body.2 This, in turn, can reduce the supply of oxygen and nutrients to vital organs, which can impact their ability to function normally – including the brain. This means that people with heart failure may experience a range of symptoms related to decreased blood flow to the brain, including dizziness, low mood, and reduction in short-term memory.1