First ESC Focused Update on dual antiplatelet therapy in CHD

My Post (8)The European Society of Cardiology (ESC) has published its first Focused Update on the use of dual antiplatelet therapy (DAPT) in coronary heart disease (CHD) (Valgimigli et al, 2017). Produced in collaboration with the European Society for Cardio-Thoracic Surgery (EACTS), the document addresses recommendations on a medical treatment that has seen conflicting advice over the years.

Conflicting evidence
According to Dr Marco Valgimigli, Chairperson of the ESC/EACTS Task Force, the conflicting evidence surrounding DAPT has resulted in many people calling it a controversial topic:

‘This has led to a great deal of uncertainty in the medical community, particularly regarding the optimal duration of DAPT after coronary stenting,’ he said.

A survey initiated by the European Association of Percutaneous Cardiovascular Interventions sought opinions from the medical community on the evidence relating to DAPT duration after coronary stenting (Valgimigli et al, 2015). It revealed considerable uncertainty over optimal duration of DAPT after stenting and therefore called for updated recommendations for practising physicians to guide treatment decisions.

Neglected populations
Alongside conflicting results in the published literature on DAPT, there is also limited evidence on various patient subsets—such as elderly patients—who may have a greater bleeding risk. Here, the benefits and risks of DAPT may be different to those seen in more selected patient cohorts included in randomised controlled trials. The aim of this Focused Update therefore is to address the current recommendations on DAPT in patients with CHD.

Dual antiplatelet therapy
Being one of the most intensively investigated treatments in cardiovascular medicine, there have been 35 randomised clinical trials of DAPT, including more than 225 000 patients. The first randomised clinical trial to establish the superiority of DAPT over anticoagulant therapy among patients undergoing percutaneous coronary intervention was published in 1996.

Platelets are small particles in the blood that can clump together to form clots; these can go on to cause myocardial infarction or the occlusion of a coronary stent. Antiplatelet agents are a class of drugs that are used to stop platelets from forming these clots. The use of two types of antiplatelet agents to prevent blood clotting is known as DAPT (American Heart Association, 2017).

The number of patients requiring dual antiplatelet therapy consisting of the combination of aspirin and an oral inhibitor of the platelet P2Y12 receptor for adenosine 5’-diphosphate has increased over time. In Europe, it is believed that around 1 400 000 patients per year may have an indication for DAPT after coronary intervention, and 2 200 000 after myocardial infarction.

P2Y12 inhibitors range from safer drugs, such as ticlopidine or clopidogrel, to the more potent and predictable, such as ticagrelor or prasugrel. The decision on when to initiate a P2Y12 inhibitor depends on both the specific drug and the disease.

DAPT reduces the risk of stent thrombosis from occurrences ranging from acute to late events. It also reduces the rate of spontaneous myocardial infarction after percutaneous coronary intervention and myocardial infarction.

For patients with stable CHD treated with percutaneous coronary intervention, the default P2Y12 inhibitor is considered to be clopidogrel. It is also commonly the default drug for patients with indication to concomitant oral anticoagulation, and in patients with acute coronary syndromes in whom ticagrelor or prasugrel are contraindicated. Ticagrelor or prasugrel is recommended in people with acute coronary syndromes unless drug-specific contraindications exist.

Recommendations for DAPT
A Task Force made up of selected medical experts carried out a comprehensive review of the published evidence for management of CHD according to ESC Committee for Practice Guidelines policy, and approved by the EACTS. A critical evaluation of diagnostic and therapeutic procedures took place, including assessment of the risk–benefit ratio. The level of evidence and the strength of the recommendation of particular management options were then weighed and graded according to predefined scales.

The Focused Update recommends a default DAPT duration of 12 months for patients with acute coronary syndrome. This is irrespective of revascularisation therapy, whether through medical therapy, percutaneous coronary intervention or coronary artery bypass surgery. In patients with high bleeding risk, 6 months of DAPT should be considered. Therapy over 12 months may be considered in patients with acute coronary syndrome who have tolerated DAPT without a bleeding complication.

The Task Force felt that the need for a short DAPT regimen should no longer justify the use of bare metal stents instead of newer generation drug-eluting stents. An assessment of the individual patient’s ischaemic risks versus bleeding risks should be used to establish duration of DAPT rather than the type of stent used.

For patients with CHD being treated with percutaneous coronary intervention who are believed to be stable, the duration of DAPT should be 1–6 months, depending on the bleeding risk. This is irrespective of the type of metallic stent implanted. For patients whose ischaemic risk is thought to be greater than the risk of bleeding, the Focused Update recommends a longer DAPT duration. The Task Force felt that there were insufficient data to recommend DAPT in patients with stable CHD treated with coronary artery bypass graft surgery.

The most controversial issue cited was the need for a prolonged DAPT regimen (anything over 12 months) in patients with acute coronary syndrome treated with percutaneous coronary intervention. This is owing to concern over ensuring benefits while diminishing risks.

‘This is a setting in which one needs to think twice about how to maximise the benefits over the risks,’ said Dr Valgimigli. ‘The most novel and important message here is that DAPT is a regimen to treat a patient, not the previously implanted stent. This is crucial and the community needs to adapt to this new treatment paradigm.’

Differing types and durations of DAPT therapy have not been seen as necessary for male and female patients, instead calling for a similar approach to care. Additionally, no difference in therapy is required for patients with diabetes.

Dr Valgimigli said:

‘The Task Force advocates a personalised medicine approach where each treatment and its duration is individualised as much as possible. The document highlights who should, and should not, receive long-term treatment, while at the same time outlining how to maximise the expected benefits over the risks.’

Conclusion
This year marks the 21st anniversary of the first randomised clinical trial that established the superiority of DAPT over anticoagulant therapy among patients undergoing percutaneous coronary intervention. However, differing advice on optimal duration of DAPT after coronary stenting makes this Focused Update long overdue—though it should go some way to guiding treatment decisions. BJCN

References

American Heart Association. 2017. What is Dual Antiplatelet Therapy (DAPT) [Internet]? Available from http://tinyurl.com/yajb9wmx

Valgimigli M, Costa F, Byrne R, Haude M, Baumbach A, Windecker S. Dual antiplatelet therapy duration after coronary stenting in clinical practice: results of an EAPCI survey. EuroIntervention. 2015;11(1):68-74. https://doi.org/10.4244/EIJV11I1A11

Valgimigli M, Bueno H, Byrne RA et al. 2017 ESC focused update on dual antiplatelet therapy in coronary artery disease developed in collaboration with EACTS: The Task Force for dual antiplatelet therapy in coronary artery disease of the European Society of Cardiology (ESC) and of the European Association for Cardio-Thoracic Surgery (EACTS). Eur Heart J; 2017. https://doi.org/10.1093/eurheartj/ehx419. [Epub ahead of print]

Taken from British Journal of Cardiac Nursing, published December 2017.

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New cross-specialty guidelines on peripheral arterial diseases

My Post (3)New guidelines on peripheral arterial diseases (PADs) have been jointly published by the European Society of Cardiology (ESC) and European Society for Vascular Surgery (ESVS) (Aboyans et al, 2017). These guidelines mark the first time that ESC recommendations on PADs have been developed as a collaborative effort between cardiologists and vascular surgeons. Management of hypertension is achieved through a combination of medication regimen and lifestyle changes. However, the results of the studies examining the level of adherence among hypertensives indicated that the target was not achieved. Saarti et al (2015) found that the level of adherence for medication regimen is 29.1%.

What are PADs?
Over 40 million people in Europe are affected by PADs (Fowkes et al, 2013)—a term used to describe all arterial diseases except those affecting the coronary arteries and aorta. Peripheral arterial diseases include atherosclerotic disease of the extracranial carotid and vertebral, mesenteric, renal, upper and lower extremity arteries.

Multidisciplinary approach
The Task Force was led by ESC Chairperson, Professor Victor Aboyans, and ESVS Co-Chairperson, Professor Jean-Baptiste Ricco. Building on recommendations laid out in the 2011 ESC guidelines (Tendera et al, 2011), it was felt by both societies that a multidisciplinary approach for the management of patients was needed.

Collaboration between specialisms has meant that there is now a single European document on the management of patients with peripheral arterial diseases. Professor Aboyans said:

‘Working together has enabled us to be comprehensive in our recommendations.’

Speaking to theheart.org | Medscape Cardiology, Aboyans stressed the need for multidisciplinary management of patients with PADs. Given the different areas of the body affected by PADs, it is necessary that other specialties beyond cardiovascular medicine and surgery are involved. An example of this would be in the case of carotid disease.

Aboyans said:

‘Talking about the management of carotid disease, we also need the input of a neurologist; the same for nephrologists or gastroenterologists.

‘We cannot think any more about a patient at a consultation and the surgeon says: “Ok, I’ll operate on you, I’ll fix the problem, and then it’s over,” because this is just the beginning of another story, which is the long-term management and reassessment of these patients, as with coronary risk,’ he added.

Complications of PADs
According to Aboyans, patients suffering from PADs often have difficulty walking— particularly those with arterial disease of the extremities. This is owing to insufficient blood flow to the lower limbs brought on by stenoses or occlusions of the peripheral arteries. This can pose a complication, as many patients may be unaware that they have a more serious condition. This is because they do not suffer from common symptoms of circulatory problems, such as shortness of breath, due to being sedentary.

‘They may have heart failure, but they don’t really complain about shortness of breath, just because they don’t walk any more,’ he said.

The benefit of cross-specialty assessment is therefore apparent. This ensures that all possible areas for concern are taken into consideration.

‘It is really mandatory that, if a patient comes to one specialty, to also have the call with other specialties, and this complementary approach is of benefit to the patients,’ he said.

‘It is one thing to fix the local-territory issue, the other is the cardiovascular health of these patients and, in the end, the prognosis.’

Changes to the guidelines
In putting together these guidelines, a comprehensive review of the published evidence was carried out. The Task Force was made up of experts in the field selected by the ESC. It included representation from the ESVS and European Stroke Organisation (ESO). This ensured all professionals responsible for the medical care of patients with this pathology were involved. The Task Force considered published articles on management of a given condition according to the ESC Committee for Practice Guidelines policy. These were then approved by the ESVS and ESO. A critical evaluation of diagnostic and therapeutic procedures for PADs was carried out, including an assessment of the risk– benefit ratio.

A number of changes have been made since the 2011 guidelines were published and new recommendations set out for the management of PADs. A chapter devoted to the use of antithrombotic drugs has been introduced for the first time. There is also a new chapter on the management of other cardiac conditions frequently encountered in patients with PADs. These include heart failure, atrial fibrillation and valvular heart disease. The chapter on mesenteric artery disease has been entirely revisited. Ricco said:

‘We have updated this chapter with new data showing the interest of endovascular surgery in these often frail patients.’

The Task Force has recommended revascularisation of asymptomatic carotid stenosis only in patients at high risk of stroke. This is despite no new major trials on the management of asymptomatic carotid artery disease since the last guidelines were published. However, there are new data on the long-term risk of stroke in patients with asymptomatic carotid stenosis.

‘The previous guidelines recommended revascularisation for all patients with asymptomatic carotid stenosis, so this is an important change,’ said Aboyans.

‘Trials showing the benefits of revascularisation compared to best medical therapy alone were performed in the 1990s but stroke rates in all patients with asymptomatic carotid stenosis have decreased since then— regardless of the type of treatment— so the applicability of those trial results in the current management of these patients is more questionable.’

There is now a strong recommendation against systematic revascularisation of renal stenosis in patients with renal artery disease. This is following the publication of several trials.

WIfI classification
A new classification system (WIfI) has been proposed as the initial assessment of all patients with ischaemic rest pain or wounds. The system takes into account the three main factors that contribute to the risk of limb amputation, which are:

  • Wound
  • Ischaemia
  • foot Infection.

Professor Ricco emphasised the impor¬tance of the new WIfI classification in lower extremity artery disease.

Guidelines into practice
The new guidelines encourage health professionals to consider its recommendations when exercising their clinical judgment, as well as in the determination and the implementation of preventive, diagnostic or therapeutic medical strategies. However, they make clear that they do not override the individual responsibility of health professionals to make appropriate and accurate decisions in consideration of each patient’s health condition. This should be done in consultation with that patient or the patient’s caregiver where appropriate and/or necessary.

References

Aboyans V, Ricco JB, Bartelink MEL et al. 2017 ESC Guidelines on the Diagnosis and Treatment of Peripheral Arterial Diseases, in collaboration with the European Society for Vascular Surgery (ESVS): Document covering atherosclerotic disease of extracranial carotid and vertebral, mesenteric, renal, upper and lower extrem¬ity arteriesEndorsed by: the European Stroke Organization (ESO)The Task Force for the Diagnosis and Treatment of Peripheral Arterial Diseases of the European Society of Cardiology (ESC) and of the European Society for Vascular Surgery (ESVS). Eur Heart J. 2017; [Epub ahead of print]. https://doi.org/10.1093/eurheartj/ehx095

Fowkes FG, Rudan D, Rudan I et al. Comparison of global estimates of prevalence and risk fac¬tors for peripheral artery disease in 2000 and 2010: a systematic review and analysis. Lancet. 2013;382(9901):1329–1340. https://doi.org/10.1016/S0140-6736(13)61249-0

Tendera M, Aboyans V, Bartelink ML et al. ESC Guidelines on the diagnosis and treatment of peripheral artery diseases: Document covering atherosclerotic disease of extracranial carotid and vertebral, mesenteric, renal, upper and lower extremity arteries: the Task Force on the Diagnosis and Treatment of Peripheral Artery Diseases of the European Society of Cardiology (ESC). Eur Heart J. 2011;32(22):2851–2906. https://doi.org/10.1093/eurheartj/ehr211

Taken from British Journal of Cardiac Nursing, published November 2017.