Danish trial demonstrates benefits of dual-chamber pacing in treating sick sinus syndrome

Aug 31, 2010

DANPACE, a Danish multicentre randomised trial comparing single lead atrial and dual chamber pacing in patients with sick sinus syndrome, concludes that dual chamber pacing, which was associated with lower rates of atrial fibrillation and re-operation, "should be the preferred pacing mode".

Behind the conclusion lies a 20-site study of 1415 subjects with sick sinus syndrome (a variety of arrhythmias caused by a malfunction of the sinus node, the heart's principal pacemaker) referred for their first pacemaker implantation. Pacemakers are routinely used to treat patients suffering from sick sinus syndrome.

The patients were randomised equally to single-lead atrial or dual-chamber pacemakers* and their progress followed for a mean of 6.4 years, producing over 7000 operational years of evidence. Results showed that all-cause were similar in both groups, 29.6% in the single-lead atrial pacemaker group and 27.3% in the dual chamber group. However, the prevalence of paroxysmal atrial fibrillation was lower in the dual chamber group than in the single-lead group (HR 0.79, p=0.024), with significantly fewer dual chamber patients requiring pacemaker re-operation during follow-up (HR 0.50, p<0.001).

Summarising the outcome, principal investigator Dr Jens Cosedis Nielsen from the Department of Cardiology, Skejby Hospital in Aarhus, Denmark, said: “The results showed that, when compared with dual-chamber pacing, single-lead atrial pacing was associated with a 27% increase in the risk of developing atrial fibrillation and a doubling of the risk of having to undergo a pacemaker re-operation.

“In prior trials, ventricular stimulation has been found to increase the incidences of atrial fibrillation and heart failure. However, in this patient group we demonstrated for the first time that dual-chamber pacing actually decreases atrial fibrillation and has no influence on the incidence of when compared with single-lead atrial pacing without ventricular stimulation.”

Explore further: Schumacher's doctor sees progress after injury

add to favorites email to friend print save as pdf

Related Stories

Osteoporosis drug may be associated with irregular heartbeat

Apr 28, 2008

Alendronate, a medication used to prevent fractures in women with osteoporosis, may be associated with an increased risk of atrial fibrillation, a type of abnormal heart rhythm, according to a report in the April 28 issue ...

Recommended for you

Schumacher's doctor sees progress after injury

8 hours ago

A French physician who treated Michael Schumacher for nearly six months after the Formula One champion struck his head in a ski accident says he is no longer in a coma and predicted a possible recovery within three years.

New MCAT shifts focus, will include humanities

Oct 20, 2014

(HealthDay)—The Medical College Admission Test (MCAT) has been revised, and the latest changes, including more humanities such as social sciences, are due to be implemented next April, according to a report ...

User comments : 0