Issue III registry defines best syncope candidates for cardiac pacing

PREFER AF shows European clinicians adhere well to AF guidelines

2013-06-26

(Press-News.org) Athens, Greece 26 June 2013. Two important studies were released at the Late Breaking Clinical Trials session II at EHRA EUROPACE 2013. The PREFER AF study2 found that Oral anticoagulation is now used in over 85% of patients with atrial fibrillation (AF) eligible for therapy. And ISSUE (the International Study on Syncope of Uncertain Aetiology) determined that cardiac pacing is more effective in patients with presumed neurally mediated syncope (NMS) and asystolic episodes in which tilt table testing proves negative (TT-), than in patients in which the tilt table testing proves positive (TT+).

PREFER AF The PREFER AF registry study, which provides a 'snapshot' of clinical practice across five European countries taken in 2012, revealed that novel oral anticoagulants are now used by 6.1% of AF patients, and that use of rhythm control mediations and catheter ablations have also increased.

"PREFER AF illustrates changes in management of patients with AF since the last ESC guidelines. The registry shows that oral anticoagulant therapy is now much more widely used than in the German Competence Network on Atrial Fibrillation (AFNET) and the Euro Heart Survey registries on AF and suggests that European clinicians are using guidelines well. The rapid uptake of new oral anticoagulants suggests that these drugs are filling a therapeutic gap," said Professor Paulus Kirchhof, presenter of the study from the University of Birmingham, UK. The investigators believe the study represents the largest European registry on AF to date.

The ESC Guidelines for the Management of atrial fibrillation3, published in 2010, incorporated several 'evolutionary' changes in the management of AF including the concept of active AF screening to initiate therapy before complications had occurred and furthermore emphasized that continuous oral anticoagulation was indicated for the majority of AF patients since almost all are at increased risk of stroke.

Between January 2012 and January 2013 the PREvention oF thromboembolic events –European Registry in Atrial Fibrillation (PREFER) registry enrolled consecutive patients with AF from 461 centres in France, Germany, Italy, Spain and UK. Altogether 42% of patients were office based, 53% hospital based and 89% were treated by cardiologists. "Since practice patterns can be influenced by the type of physicians, we felt it was important to recruit patients from a number of different settings," explained Prof. Kirchhof.

Results showed that of the 7,243 evaluable patients enrolled, 30% had paroxysmal AF, 24% persistent AF, 7.2% long standing persistent, and 38.8% had permanent AF.

When medications were examined it was found that 66.3% of patients (4799) received a vitamin K antagonist (VKA) as monotherapy; 9.9% of patients (720) received VKA and an antiplatelet agents in combination; and 6.1% received novel oral anticoagulants (dabigatran, rivaroxaban or apixaban). Furthermore, antiplatelet agents alone were given to 11.2% of patients (808) and 6.5% of patients (474) received no antithrombotic therapy at all.

Altogether 78.6% of patients were adequately rate controlled, using a mean heart rate of 60 to 100 bpm as the definition.

Rhythm control therapy was given to 66.7 % of patients, with rhythm control consisting of electrical cardioversion in 18.1 % of patients; pharmacological conversion in 19.5%; amiodarone in 24.1%; flecainide in 10.5%; sotalol in 5.5%; dronedarone in 4% and other antiarrhythmic drugs in 3.1% and catheter ablation in 5%. However, over 80% of patients still suffered from AF symptoms despite good rate control.

"We were surprised and puzzled by the high number of patients who suffer from AF despite good rate control," said Prof. Kirchhof. "This indicates that we have more work to do to develop tools to better prevent AF and possibly to better maintain sinus rhythm in the future."

The ongoing EAST (Early treatment of atrial fibrillation for stroke prevention trial) study 4 is currently testing whether early use of rhythm control therapy can prevent adverse cardiovascular outcomes in patients with AF compared to usual care.

ISSUE (international study on syncope of uncertain aetiology) The second important study at the session, the ISSUE 3 registry, showed that diagnosis of NMS, using ESC guidelines on Diagnosis and Management of Syncope,5 could be confirmed with an implantable loop recorders (ILR) in 87% of patients.

"By showing that NMS tilt-negative asystolic patients benefit most from cardiac pacing, the study inverts previous knowledge on indications for pacing. Prior to this registry, cardiac pacing for NMS had only been evaluated in patients with positive tilt test responses and no indications had existed for patients with negative tilt test results," said Professor Michele Brignole, presenter of the study.

ISSUE was a prospective registry set up to analyse the diagnostic yield of ILRs in specific subgroups of patients with syncope of uncertain aetiology. The registry took place in Italy, Spain, Germany, France, Canada, The Netherlands and UK. For the ISSUE 3 registry, between July 2006 and November 2010, 504 patients with suspected NMS, according to criteria laid down in guidelines, had an implantable loop recorder (IRL) fitted. Entry criteria included being older than 40 years and having experienced more than three episodes of syncope in the previous two years thought to be neurally mediated. Guidelines6 state that a likely diagnosis of NMS can be made when patients have a consistent history and competing diagnoses have been excluded.

Results show that a confirmed diagnosis could be achieved in 187 patients, with ILR findings in 162 of these patients (87%) being consistent with a likely diagnosis of NMS, and IRL findings in 25 patients (13%) allowing NMS to be ruled out. Of the 162 patients with IRL findings suggesting NMS 99 were found to be asystolic (where the heart stops beating for a short period of time) and 63 hypotensive (where blood pressure falls).

Altogether 52 patients received a pacemaker, of which 26 had a positive table tilt test result(TT+) and 26 patients a negative table tilt test (TT-)result. After 21 months the syncope recurrence rates were 55% (95% CI 29-85) in TT+ patients fitted with the pacemaker versus 5% ( 95%CI 1-32)in TT- patients fitted with the pace maker (p=0.004). When the recurrence rate of 55% in the TT+ patients was compared to 44 untreated patients (who acted as controls) who had recurrence rates of 64% the difference was not found to be statistically significant (p=0.75).

For patients with negative table tilt tests, the observed 5% recurrence rate was similar to that observed for patients paced for cardiac intrinsic bradycardia. "Thus, pacemaker therapy can be offered to these patients with the same confidence as it can in patients with sick sinus syndrome or AV block," said Prof. Brignole. "Such patients can be reassured that, after pacemaker implantation, they'll likely be free from reoccurrences of syncope."

But before pace maker therapy is offered to patients with TT+ even if they have experienced an asystolic response during the tilt test patience should be cautioned they may have reoccurances. "Although some benefits may still be possible in terms of reduced syncope burden, patients should be informed that they'll likely have some recurrences despite pacing," said Prof. Brignole.

Most of the misdiagnoses in the study were due to intrinsic cardiac arrhythmias which were largely unpredictable from baseline characteristics. "This aspect, which has not yet been clarified in the literature, may be relevant in clinical practice," he said, adding that it further justifies the usage of the ILR diagnostic tool.

### Notes Neurally mediated syncope (NMS) is a disorder of the autonomic regulation of postural tone, which results in hypotension, bradycardia and loss of consciousness. Typically a patient with neurally mediated syncope experiences nausea, light headedness, a feeling of warmth, and pallor before abruptly losing consciousness.

Neurally mediated syncope (reflex syncope) refers to a heterogeneous group of conditions in which cardiovascular reflexes that are normally useful in controlling the circulation become intermittently inappropriate in response to a trigger, resulting in vasodilatation and/or bradycardia and thereby a fall in arterial blood pressure and global cerebral perfusion.

Treatment options include behavioural modifications and several pharmacologic therapies, with pacemakers implanted for severe recurrent syncope unresponsive to conventional treatment.

Tilt table tests are used to evaluate the cause of unexplained syncope. During the tilt table test, the table is moved from a horizontal to vertical position, allowing doctors to evaluate the body's cardiovascular response (ECG and blood pressure) to changes in position. Symptoms, blood pressure, pulse, electrocardiogram and sometimes blood oxygen saturation are recorded. The test is considered positive if the patient experiences symptoms associated with a drop in blood pressure or cardiac arrhythmia. A normal person's blood pressure will not drop dramatically while standing because the body will compensate for this posture with increases in heart rate and constriction of the blood vessels in the legs.

Implantable loop recorders (ILRs) are small devices which are implanted just under the skin of the chest that allow the heart's electrical activity to be recorded for prolonged periods. Results of both late breaking trials presented at EHRA EUROPACE 2013

Wednesday's late breaking trial session included the following abstracts1: CITADEL/ CENTURION STUDY Interim Analysis: Use of an Antibacterial Envelope is Associated with Very Low 90 day CIED Infection Rates. C Henrikson.
Optimal Antitachycardia Therapy in ICD Patients without pacing Indications. C Kolb.
Trends in management of patients with atrial fibrillation in 5 European countries. P Kirchhof.
Validation of the clinical diagnosis of neurally- mediated syncope. M Brignole.
Radio-frequency ablation for sustained monomorphic ventricular tachycardia in patients with structural heart disease without implantation of a defibrillator. P Maury.

ELSE PRESS RELEASES FROM THIS DATE:

Patient suicide and homicide risk often missed say researchers

2013-06-26

The assessment of risk in patients who go on to die by suicide or commit homicide is often poor, a new study has found. A report by The University of Manchester's National Confidential Inquiry (NCI) into Suicide and Homicide by People with Mental Illness out today has raised concerns about the way that risk is assessed and led to criticism of the tick-box approach to clinical practice. Researchers looked at a sample of 81 cases where risk had been judged to be low, but seven days or less after the assessment the patient died by suicide or committed homicide, to retrospectively ...

Major rethink needed if chemical industry is to meet greenhouse gas targets

2013-06-26

The UK chemical industry requires 'an urgent and radical rethink' into how it produces chemicals if it is to play its part in meeting Government's stringent greenhouse gas emission reduction targets of 80% plus by 2050. That is one of the conclusions of a major new report issued today by the University of Manchester's Tyndall Centre for Climate Change Research. Entitled 'Can the UK afford (not) to produce chemicals in 2050?' the report was generated in collaboration with the North East Process Industry Cluster (NEPIC) following investigations into chemical sector greenhouse ...

Exaggeration, exaggeration, exaggeration: Parties over-egg claims on education

2013-06-26

Exaggeration, exaggeration, exaggeration: parties over-egg claims on education Both major political parties have overstated their claims and counter-claims on education, according to an independent review of Labour's record in office. The report, led by Professor Anthony Heath from The University of Manchester, says governments mostly fail to introduce policies which can be rigorously evaluated. The report, published this month in the Oxford Review of Economic Policy, praises Labour 's policy on further education and Education Maintenance Allowance. The Blair and ...

Complex genetic architectures: Some common symptoms of trisomy 21

2013-06-26

Down syndrome, more commonly known as "trisomy 21" is very often accompanied by pathologies found in the general population: Alzheimer's disease, leukemia, or cardiac deficiency. In a study conducted by Professor Stylianos Antonarakis' group from the Faculty of Medicine of the University of Geneva (UNIGE), researchers have identified the genomic variations associated with trisomy 21, determining the risk of congenital heart disease in people with Down syndrome. The targeted and specific study of chromosome 21 revealed two genomic variations, which, in combination, are the ...

Bladder function restored in animals with severe spinal cord injury

2013-06-26

For the first time, researchers have restored significant bladder function through nerve regeneration in rats with the most severe spinal cord injuries (SCI). The breakthrough paired a traditional nerve bridge graft with a novel combination of scar degrading and growth factor treatments to grow new nerve cells from the thoracic level to the lower spinal cord region. Details of the discovery appear in the June 26 issue of the Journal of Neuroscience. Neuroscientists from Case Western Reserve University School of Medicine and Cleveland Clinic built a regeneration bridge ...

Virtual skin model reveals secrets of skin aging

2013-06-26

We constantly grow new skin and slough off the old. Until now, scientists have never agreed on exactly how this works, but new research from the University of Sheffield may provide the answer. Engineers and biologists at the University of Sheffield have shown how a recent theory-- that skin has 'sleeping' stem cells which can be woken up when required-- best explains how our skin constantly regrows. The research-- conducted in collaboration with The Procter & Gamble Company (P&G), makers of Olay, and published in Nature Scientific Reports-- has implications for combating ...

Teenage physical fitness reduces the risk of suicidal behavior later in life

2013-06-26

Being in good physical shape at 18 years of age can be linked with a reduced risk of attempted suicide later in life. So says a study of over one million Swedish men conducted by researchers at the Sahlgrenska Academy, University of Gothenburg, Sweden. A new, extensive report from the Swedish National Board of Health and Welfare on child and adolescent health shows that teenagers and young adults in Sweden have worse mental health than their age cohorts in other western countries. Another report that is part of a new social welfare study shows that the number of serious ...

Sailors most often injure their knees -- on land

2013-06-26

The knees are the body part that is injured the most by dinghy sailors. The injuries are primarily due to overstrain and most often occur during physical training. This was shown in a study at Sahlgrenska Academy, University of Gothenburg, Sweden. "Studies have been made on the risk of injury for many sports, but not for dinghy sailing. With more knowledge, we can create recommendations that will prevent sailors from getting injured," says Lena Bøymo-Having, who conducted the study at the Sahlgrenska Academy, University of Gothenburg. During the study, researchers followed ...

Having a job helps women with HIV manage their illness, according to new research

2013-06-26

Having a job helps women with HIV manage their illnesses, according to researchers from Case Western Reserve University and the University of California at San Francisco. The routine of a work schedule, plus the job-related money and benefits, provides extra emotional support for these women, said Allison Webel, assistant professor of nursing at Case Western Reserve University's Frances Payne Bolton School of Nursing and the study's lead author. Findings in the National Institutes of Health-supported study were published this month in Social Science & Medicine. The ...

Songbirds turn on and tune up

2013-06-26

Bullfinches learn from human teachers to sing melodies accurately, according to a new study by the late Nicolai Jürgen and researchers from the University of Kaiserslautern in Germany. Their analysis of human melody singing in bullfinches gives insights into the songbirds' brain processes. The work is published online in Springer's journal Animal Cognition. Music performance is considered to be one of the most complex and demanding cognitive challenges that the human mind can undertake. Melody singing requires precise timing of several organized actions as well as accurate ...

Issue III registry defines best syncope candidates for cardiac pacing

ELSE PRESS RELEASES FROM THIS DATE:

LAST 30 PRESS RELEASES: