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Known as the His-bundle, this small track of muscle fibres plays a key role in keeping the different parts of the heart beating in sync — but has never been targeted with a pacemaker before.

Around 900,000 people in the UK have heart failure.

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However, these aren’t always effective for people with severe heart failure, partly because they do not improve the pumping function of the heart, but also because they can’t help if the heart is not relaying electrical signals from the right to the left side, or from top to bottom, efficiently.

A relatively new development is cardiac resynchronisation therapy (CRT), a pacemaker with a third lead placed in the left ventricle, helping it to pump more efficiently as signals are sent to both the right and left sides of the heart.

So it is vital to control those pictures and not let them run away with our feelings.• 1. It is not a matter of believing the image is real: just imagine it as vividly as possible.

In heartbreak, there is often a backlog of emotional learning to get through. Your unconscious mind will protect you, and give you a rest so that you can deal with the next bit.

In around a fifth of cases, patients have an abnormally long delay in the time it takes for natural electrical signals that tell the heart to contract to travel from the top to the bottom of the heart. Until now doctors have been unable to correct this problem.