Medical devices for heart failure

Implantable devices are an important treatment option for certain people with heart failure who may be at risk of irregular heart rhythm, or an abnormal muscle contraction that can’t be controlled with medicines. Some of the people we talked to had procedures to fit pacemakers, Implantable Cardioverter Defibrillators (ICDs) and Cardiac Resynchronisation Therapy (CRT) devices, also known as a biventricular pacemakers.

Implantable cardioverter defibrillators (ICD’s) are used in people with a high risk of serious abnormal rhythm problems in the ventricles or large chambers of the heart. ICDs use a small electrical shock, known as cardioversion to help return the heart rhythm back to normal. If this doesn’t work, or a serious problem is detected, the device will deliver a stronger electrical impulse, known as defibrillation, to return the heart rhythm back to normal.

We asked Helen Jackson, Advanced Nurse Practitioner in heart failure to help explain implantable devices for heart failure.

Helen, specialist nurse, explains Implantable Cardioverter Defibrillator (ICD)

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Further information for people with ICDs is available online at the British Heart Foundation.

A large number of people with heart failure have conduction defects where the two ventricles of the heart do not work together properly – this can be corrected by a cardiac resynchronisation therapy (CRT) pacemaker. This type of pacemaker is known as a CRT-P device and is used to make both the left and right ventricle start beating at the same time again. CRT pacemakers are different from typical pacemakers which only pace the right ventricle and control heart rate.

A CRT device may be just a pacemaker or it may also able to deliver a shock (cardioversion or defibrillation) in a life-threatening situation as well. It is called a CRT-D if defibrillation is part of the function of the device. Further information for people with CRT is available online at Arrhythmia Alliance.

When taking part in a research project Bruce found out that his CRT device is much more expensive than an ordinary pacemaker.

Age at interview 76

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Age at diagnosis 63

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A specialist nurse explains Cardiac Resynchronisation Therapy (CRT) and the differences between CRTd and CRTp devices

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Information about why an implantable device is required and the risks and benefits of such a treatment are usually given to the patient by the cardiologist involved in the implanting or by specialist nurses – called ICD nurses (See ‘Specialist heart failure nurses‘). The Arrhythmia Alliance website also has lots of useful information about implantable devices.

Bruce says the ICD nurse explained medical devices, gave written information and showed him the kind of device he was going to have fitted the next day.

Age at interview 76

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Age at diagnosis 63

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Mahendra was told that the ICD device was going to help with his palpitations and so to improve his quality of life.

Age at interview 59

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Age at diagnosis 40

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People we talked to generally had no concerns about having a medical device fitted but did worry about things such as having the procedure under local anaesthetic or told they should not drive for six weeks after the procedure.

Mahendra knew he was not allowed to drive for 6 weeks after his ICD was fitted and worried about how to get to work and care for himself.

Age at interview 59

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Age at diagnosis 40

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Implantable devices are inserted under local anaesthetic and are positioned under the collarbone with flexible electrode leads coming from it that are positioned in the heart (for more information see the Arrhythmia Alliance website).

Vivienne was scared of having the ICD inserted under local anaesthetic, so the cardiologist agreed for her to have it done under general anaesthetic.

Age at interview 61

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Age at diagnosis 60

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Angela explains what happens during CRT surgery.

Age at interview 55

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Mahendra had a nurse with him throughout the procedure and says that recovery time was one and a half hours.

Age at interview 59

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Age at diagnosis 40

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Usually people stay in hospital overnight but in some cases – for example where people are on anticoagulant medication such as warfarin – they need to be in hospital before and after the medical device is fitted, first to stop the anticoagulant medication and be put on heparin and, afterwards to be monitored when re-starting anticoagulant medication.

Mahendra’s anticoagulant treatment was stopped before surgery and re-started again after his device was fitted. He was in hospital before and after the procedure.

Age at interview 59

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Age at diagnosis 40

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An aftercare instruction leaflet stating what to avoid is given to people before they leave hospital. For instance, people should avoid stretching their arms upwards for six weeks following the procedure; people with medical devices should avoid contact with devices with magnetic force, for example alarm systems in shops and in airports. People are also given instructions about electrical equipment in the home.

Bruce talks about what he was told to avoid, what to do when travelling abroad and what precautions to take when using electrical equipment in the home.

Age at interview 76

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Age at diagnosis 63

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A few weeks after the device is implanted the patient has a follow-up appointment to make sure all is well. The person continues to be monitored over-time. Medical devices sometime need to be regulated and the speed may need to be put up or down depending on the individual. People also talked about feelings of discomfort and the emotional impact of living with an implantable device.

The ICD setting was initially fast and had to be adjusted, but before that Vivienne was experiencing what she describes as a baby kicking’ sensation.

Age at interview 61

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Age at diagnosis 60

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Angela expected that the CRT setting would be adjusted at her six weeks check-up because she continued feeling breathless.

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Helen Jackson, specialist nurse, talks about patient care following the fitting of an implantable device

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Helen talks about the benefits of having an implantable device as well as the type of problems reported by patients attending ICD clinics

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Sometimes it took people time to get used to having an implantable device or notice an improvement in their condition. Bruce indicated that he was pleasantly surprised to be discomfort-free shortly after his treatment.

Vivienne talks about how she feels since having the ICD procedure but says it took time for her to notice any benefits.

Age at interview 61

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Age at diagnosis 60

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Bruce talks about his leisure and exercise activities after the fitting of his ICD device.

Age at interview 76

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Age at diagnosis 63

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Mahendra explains it takes time to notice the benefits of an implanted medical device but that it has definitely helped to control his palpitations.

Age at interview 59

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Age at diagnosis 40

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People with ICD/CRTs need to attend regular hospital appointments to make sure that all is well. The device is checked using a short-range radio signal to communicate with it through the skin. This procedure is painless and discomfort free and visits are usually needed between one and four times a year. People we talked with found it reassuring to be so well monitored.

Mahendra’s implantable device is usually checked every three months and he sees the cardiologist once a year.

Age at interview 59

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Age at diagnosis 40

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Bruce talks about his check-up consultations since having the ICD fitted and says that he occasionally notices the ICD is at work.

Age at interview 76

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Age at diagnosis 63

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Generally people with CRT-D, CRT-P, ICD and permanent pacemakers are not able to safely have an MRI scan.

Medical devices may need to be disabled during surgical procedures which use diathermy equipment – for sealing blood vessels. The diathermy generates electrical interference that the medical device might interpret as a life threatening arrhythmia and therfore deliver a shock. The device is disabled by a technician with a programmer or it could be disabled by placing a magnet over the device. The pacemaker function continues but the defibrillator is disabled. After the procedure the device needs to be checked to ensure that all the settings are back to normal.

When Bruce had surgery for colon cancer his ICD was switched off and a device specialist was present during the operation. He had CT but not MRI scans.

Age at interview 76

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Age at diagnosis 63

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Mahendra is due to have the ICD battery changed under general anaesthetic.

Age at interview 59

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Age at diagnosis 40

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Implantable devices can also be checked remotely using telemonitoring via a telephone line or a wireless connection. In this way, many implantable devices are able to send clinical data to health professionals without the need for a visit to the hospital. (See ‘Heart failure monitoring at home‘)

Vivienne explains how her Medtronic machine is monitored from the hospital via a telephone connection 24/7.

Age at interview 61

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Age at diagnosis 60

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Bruce explains how remote monitoring and hospital monitoring is done. Bruces wife found the monitor device too upsetting to have it by the bedside but he was fine with it.

Age at interview 76

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Age at diagnosis 63

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People living with heart failure might have access to Helplines and email run by heart failure nurses for support and advice but such services vary across the UK (also see our section on ‘Specialist heart failure nurses’).

Specialist nurse Helen talks about the support available to people with ICD’s which varies across the country. She thinks it is important for patients to discuss with their families the prospect of ICD treatment

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ICDs are designed to deliver an electric shock if the heart rate becomes very fast and the pacing function of the device is unable to correct the rhythm. People said that these shocks from an ICD feel like being suddenly kicked or punched in the chest. People might have warning signs before an ICD shock like palpitations, light-headedness or feeling dizzy. People are given specific advice of what to do in the event of an ICD shock, for example to sit or lie down on the ground, to tell someone they are feeling unwell and not to drive. For more information on ICD shocks see CRT/ICD Patient Information leaflet from the Arrhythmia Alliance website.

Vivienne often had shocks or palpitations before from her ICD until she had the setting adjusted. Each time she felt unwell but didn’t need to call emergency services.

Age at interview 61

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Age at diagnosis 60

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Mike’s ICD shocked him 4 times, resulting in a 9 year driving ban; after having a new ICD and remote monitoring device he is thrilled to be driving again

Age at interview 69

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Specialist nurse Helen gives advice on what to do in the event of an ICD shock

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See also our ‘Living with heart failure‘ section.

Left ventricular assist devices (LVADs)

LVADs are most commonly used to support a failing heart until a donor heart becomes available for transplantation. This is known as a ‘bridge to transplantation’, where the device is only used for a short time and is removed when a donor heart is transplanted. It is a mechanical pump designed to help the left ventricle do its job. It is inserted surgically – either into the left ventricle itself, or into the aorta to help boost the pumping action of the heart (for more information see the British Heart Foundation’s website). We have been unable to interview anyone who has had a LVAD. If you have had a LVAD and would like to be interviewed please contact us.

Surgery for heart failure

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