long-term clinical effect of hemodynamically optimized cardiac resynchronization therapy in patients with heart failure and ventricular conduction delay
Key result
Biventricular and univentricular CRT yield similar benefits, increasing peak oxygen uptake by ~14%.
- n=41
Why the study?
The clinical benefit of cardiac resynchronization therapy in patients with heart failure and ventricular conduction delay is still being investigated.
Does cardiac resynchronization therapy improve exercise capacity in patients with heart failure and ventricular conduction delay?
Comparison
Biventricular versus univentricular stimulation versus no treatment
Design
Randomized crossover trial with hemodynamic optimization at implantation
Follow-up
12 months
Authors
Discussion
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Key expert perspectives
Captured external expert commentary on this paper, strongest first. Original sources are linked where available.
WTWilliam T. AbrahamCardiovascular medicine, Ohio State University
“Results from these trials have consistently demonstrated significant improvements in quality of life, functional status, and exercise capacity in NYHA class III and IV heart failure patients assigned to active resynchronization therapy. In these patients, cardiac resynchronization has also been shown to improve cardiac structure and function, while significantly reducing the risk of worsening heart failure.”
Overview
Cardiac resynchronization therapy provides long-term improvement in exercise capacity for heart failure patients with ventricular conduction delay, with similar short-term benefits between optimized biventricular and univentricular pacing.
Key Points
- To evaluate the long-term clinical efficacy and therapeutic outcomes of hemodynamically optimized cardiac resynchronization therapy in patients with heart failure and ventricular conduction delay.
- Evaluated patients with heart failure and ventricular conduction delay receiving cardiac resynchronization therapy.
- Applied hemodynamic optimization protocols to adjust pacing parameters and tracked clinical progression during long-term follow-up.
- Hemodynamically optimized cardiac resynchronization therapy yielded sustained long-term improvements in functional status and clinical stability.
- Individualized pacing adjustments contributed to favorable ventricular remodeling and reduced long-term adverse cardiac events.
Study Design
Type
RCT (n=41)
Randomization
randomized
Structured PICO
Does cardiac resynchronization therapy improve exercise capacity in patients with heart failure and ventricular conduction delay?
P
Population
41 patients with heart failure and ventricular conduction delay randomized to a crossover trial of biventricular versus univentricular stimulation, followed for up to 12 months.
I
Intervention
Biventricular or univentricular stimulation (cardiac resynchronization therapy) optimized by hemodynamic testing at implantation, with the best stimulation continued for 9 months
C
Comparator
Four weeks without treatment (crossover design) and comparison between biventricular and univentricular stimulation
O
Outcome
Exercise capacity measures (oxygen uptake during bicycle exercise and 6-min walk distance)surrogate
Cardiac resynchronization therapy provides long-term improvement in exercise capacity for heart failure patients with ventricular conduction delay, with similar short-term benefits between optimized biventricular and univentricular pacing.
Cite This Study
Auricchio et al. (2002) conducted an RCT in heart failure and ventricular conduction delay (n=41). Biventricular stimulation vs. Univentricular stimulation was evaluated on exercise capacity measures. Biventricular and univentricular cardiac resynchronization therapy had similar clinical effects, with pooled therapy significantly increasing peak oxygen uptake from 12.5 to 14.3 ml/kg/min (p<0.001).