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Cascade testing for familial hypercholesterolaemia

Our work to help diagnose, treat and track familial hypercholesterolaemia (FH) through families saves the lives of people who don’t know they need saving.

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Familial hypercholesterolaemia (FH) is caused by an inherited genetic defect, resulting in abnormally high total and LDL cholesterol levels in the blood. Early detection and treatment with lipid-lowering drugs can increase life expectancy to near normal.

FH affects 264,000 people in the UK, approximately 1 in 250 of the population.1 High cholesterol levels develop from childhood and result in a higher risk of early heart disease.

Left untreated, FH leads to a greater than 50% risk of coronary heart disease in men by the age of 50 years, and at least 30% in women by the age of 60 years.

However, early detection and treatment with lipid-lowering drugs can increase life expectancy to near normal.

Cascade testing of first-degree relatives of those with suspected FH is highly cost effective. High levels of undetected FH in the UK and associated morbidity and mortality mean that adopting cascade testing should yield substantial quality-of-life and survival gains in addition to reducing costs from avoidable CHD treatment.

The BHF commissioned a paper published in the European Heart Journal that concluded that testing is highly cost effective and would prevent thousands of premature heart attacks.

Nationwide system

This approach provides the evidence to develop a FH cascade testing service across regional healthcare systems, bringing together primary and specialist secondary care services to more effectively and efficiently identify and treat undiagnosed FH and reduce premature heart attacks and deaths.

NICE has emphasised the need for “a nationwide, family-based, follow-up system” to enable comprehensive identification of people affected by FH.

Supporting the implementation of FH cascade services across the UK has brought to light a variety of local and system level barriers and enablers that are contributing to the current variation in access to services across the country.

50% – the risk of siblings and children of a person with FH sharing the genetic defect

Cascade testing services

FH cascade services test, diagnose and manage patients and relatives with inherited high cholesterol.

In the 1990s, Professor Steve Humphries made many important discoveries about the faulty genes that cause FH. His BHF-funded research led to the development of a blood test that shows whether someone has a fault in one of three key genes.

Over the past decade, the BHF has pioneered a cascade testing service to identify and treat first-degree relatives of people with FH in England and Scotland, following a successful scheme in Wales.

When cascade testing began in 2010, Wales had just 97 known FH patients. Since then, at least 2,616 previously undiagnosed case of FH have been identified across the UK as of June 2018.

Watch: How the BHF is identifying and treating FH

We fund research into heart and circulatory disease and ensure discoveries from the lab bench make a difference at the patient’s bedside. FH is just one example of that work in action.

How does FH cascade testing work?

Step 1
GP refers patient with suspected FH to one of the lipid clinics, where family history is discussed.

Step 2
An assessment is made using the Simon Broome criteria [PDF] and initial treatment begins to reduce cholesterol.

Step 3
The patient is referred to the clinic’s FH specialist nurse, who arranges a genetic test alongside blood cholesterol (LDL-C) concentration measurement.

If the patient tests gene-positive for FH, they are referred for family cascade testing, where immediate relatives are invited for testing and treatment. If any of them test positive, then their immediate family are also invited for testing.

Suzanne's story

Suzanne Sheppard is painfully aware of the devastation heart disease can cause.

Her father suffered a fatal heart attack in 1988 when he was 41 and she was just 15. His father had also died unusually young, due to a heart attack. This was the first clue that something wasn’t right. Suzanne’s cholesterol was twice normal levels. But no one could tell her why.

Thanks to the BHF’s part-funded pilot cascade testing programme in Wales, Suzanne finally found a reason for her high cholesterol: FH. With a single DNA test, one of the FH nurses identified that Suzanne had inherited a faulty gene which had caused her to have raised LDL cholesterol levels from birth. Her son, Cameron, has a 50/50 chance of inheriting the condition.

He will be tested when he is ten.

Our innovation programme

Cascade testing reduces the average age at which FH patients are diagnosed and treated. So we aren’t just waiting around for a heart attack to happen.

In 2008, the NICE clinical guideline 71 reported that diagnosing and treating people with FH and contacting their families through a systematic process of cascade testing provides one of the best opportunities for keeping patients healthy and out of hospital. The updated 2018 guideline has since called on GPs to search primary care records to find patients with signs of the condition. It also reiterated the importance of genetic testing to confirm a diagnosis – and for their family members to receive cascade testing.

In 2010, the BHF launched a pilot scheme, with an initial investment of £450,000, to provide a proactive interface between primary, secondary and tertiary care in Wales. Our funding paid for specialist clinical nurses for the first three years of the service.

The pilot was a partnership with NHS Walesthe Welsh Assembly Government, with support from HEART UK and the Genetic Alliance.

After the initial success of the Wales scheme, we extended the programme. In 2014, a further £1.5m was invested to continue identifying FH in England and Scotland. Across the 12 sites, FH nurses coordinated new service models, including primary or secondary care-led models and more nuanced dual-care models.

The benefits

  • 3,522 previously undiagnosed FH cases identified since the FH nurses came into post, as of August 2019
  • Improved quality of outcomes for people with FH through optimal therapy to reduce risk of coronary heart disease
  • Significant improvement in patient and carer quality of care reported
  • Psychological benefits from confirmation of absence of disease for patients who may have lost multiple family members to undiagnosed FH
  • Improved awareness so healthcare professionals are better equipped to recognise potential cases and refer in a timely manner for further assessment and, if appropriate, genetic testing.

Saving lives, reducing costs

NICE estimates that if 50% of the predicted relatives of people with FH were diagnosed and treated, the NHS could save £1.7m per year on healthcare for heart disease by preventing cardiovascular events.3

In our FH programme, the estimated incremental cost effectiveness ratio (ICER) per relative tested was £5,806, far below the NICE threshold of £20,000–£30,000.3

£380 million – amount the UK could save from avoided CHD events by diagnosing and treating all relatives of FH
Source: Heart UK (2012) Saving lives, saving families. The health, social and economic advantages of detecting and treating familial hypercholesterolaemia (FH) [3]

Identifying enablers and barriers

To highlight the emerging issues in delivering FH services and inform senior decision makers in healthcare, we commissioned an independent report that gathers evidence from key stakeholders involved in delivering, planning and commissioning FH services.

Download now

Watch: How patients experience optimal and non-optimal FH pathways

FH services differ across the UK, leading to unwarranted variation in patient care. The videos below showcase patient experiences of FH services in their area, ranging from a missed diagnosis (non-optimal pathway) to the best possible care (optimal pathway).

Information and resources

Free DNA testing for registered FH patients

The FH Paediatric Register aims to allow monitoring of the safety and efficacy of current and new treatments and to provide anonymised data for valid research in the field.

The register is hosted by the Royal College of Physicians in collaboration with the Royal College of Paediatrics and Child Health, HEARTUK, the BHF and the British Inherited Metabolic Disease Group.

Planning and delivering FH services

The following resources have been developed to:

  • help diagnose and manage FH patients effectively
  • set up, plan and deliver FH services effectively and efficiently.

Planning

NHS RightCare offers best practice guidance and case studies for a range of CVD conditions, including FH:

FH services map

Our map can help you locate a familial hypercholesterolaemia (FH) service near you. The map below provides details of 24 FH services across the UK, including name and address, location, area covered and contact details, where available.

Source: Out-of-area cascade testing letter, developed by BHF

This map has been developed to support implementation of the NICE Familial Hypercholesterolaemia: identification and management (CG71) guidance. If you want to be represented or need to amend your details contact the Editor, Healthcare Professionals.

Lipid Clinics Map (Heart UK)

Heart UK publishes a map of lipid clinics across the UK.

FH register and audit

The Royal College of Physicians (RCP) hosts a FH register and audit to establish effectiveness of current therapies for children with FH. This includes a map of participating hospitals. The BHF has a representative on the UK FH Paediatric Register Steering Committee.

The RCP newsletter keeps clinicians who work with children with FH up to date with how many children are on the paediatric FH register, resources and analyses of the data collected. You can read the latest newsletter via the Paediatric Register website. The newsletter is accessible via the left-hand menu.

Poster resources

BHF-funded FH nurses have produced a series of conference posters [ZIP download], describing different aspects of FH services in their area.

References

1  Versmissen J ,Oosterveer DM et al. Efficacy of statins in familial hypercholesterolaemia: a long term cohort study. BMJ 2008:337
2  BHF (2015) Innovation in Practice
3  Heart UK. Saving lives, saving families. The health, social and economic advantages of detecting and treating familial hypercholesterolaemia (FH). 2012

 
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