The influenza injection is safe for most people, and it is much safer for the heart patient to receive a flu shot than to risk getting the flu. This is a vaccine, which some are given with a nasal spray and others are injected into the arm, they both provide protection from certain strains of influenza that can be more dangerous than the vaccine.

The nasal spray is not always recommended for the person with heart disease, and this is because it can trigger a response in the body causing the flu. It is also recommended if the type of heart disease is not stable at the time the shot is being given the heart patient should not have one at that time, as it can cause and unwanted reaction involving the heart condition.