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Leadless left ventricular endocardial pacing: A real alternative or a luxury for a few?
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Cardiac Resynchronization Therapy: An Overview on Guidelines
No full textCardiac resynchronization therapy (CRT) is included in international consensus guidelines as a treatment with proven efficacy in well-selected patients on top of optimal medical therapy. Although all the guidelines strongly recommend CRT for LBBB with QRS duration greater than 150 milliseconds, lower strength of recommendation is reported for QRS duration of 120 to 150 milliseconds, especially if not associated with LBBB. CRT is not recommended for a QRS of less than 120 milliseconds. No indication emerges for guiding the implant based on echocardiographic evaluation of dyssynchrony. Many data indicate that CRT is underused and there is heterogeneity in its implementation
Cardiac Resynchronization Therapy: An Overview on Guidelines
No full textCardiac resynchronization therapy (CRT) is included in international consensus guidelines as a treatment with proven efficacy in well-selected patients on top of optimal medical therapy. Although all the guidelines strongly recommend CRT for LBBB with QRS duration greater than 150 milliseconds, lower strength of recommendation is reported for QRS duration of 120 to 150 milliseconds, especially if not associated with LBBB. CRT is not recommended for a QRS of less than 120 milliseconds. No indication emerges for guiding the implant based on echocardiographic evaluation of dyssynchrony. Many data indicate that CRT is underused and there is heterogeneity in its implementation
Against all odds: Targeted pacing site for resynchronization therapy by venoplasty and active fixation lead
Full text linkAbstractIn cardiac resynchronization therapy, reaching the target pacing site is essential to achieve optimal therapy. Coronary vein stenosis in the target vein might be an obstacle for lead placement, which can be overcome by venoplasty and stenting of the narrowed segment. Additional active fixation of the left ventricular lead ensures precise location in the target site with minimal risk of lead dislodgment
Left ventricular lead stabilization to retain cardiac resynchronization therapy at long term: When is it advisable?
No full textAimsLeft ventricular (LV) lead dislodgement occurs in about 10.6% of patients in the first 12 months after cardiac resynchronization therapy defibrillator implantation, and causes lack of clinical improvement, repeated surgery, and predisposes to infective complications and death. To understand the factors predictive of lead dislodgement, and to investigate whether bipolar LV lead stabilization can reduce the dislodgement rate and improve the clinical outcome.Methods and resultsPredisposing coronary vein anatomy was identified on a retrospective series of 218 patients implanted before August 2009. Lead stabilization guided by vein anatomy was prospectively tested on consecutive patients from October 2009 to December 2010. Among 84 patients, lead stabilization based on vein anatomy was recommended in 19 patients, of which 16 agreed and 3 refused. Two of these latter had lead dislodgement within 1 month, whereas none of the former had adverse events during 23.8 ± 3.1 months follow-up. Only 1 of 58 patients deemed at low risk had lead dislodgement. Seven patients required lead stabilization for severe phrenic stimulation issues that dictated lead placement at specific sites. Patients with stabilized LV leads were more likely to be cardiac resynchronization therapy (CRT) responders than the others: 19 of 26 (73%) vs. 34 of 58 (59%, P= NS), and had a significantly higher proportion of super-responders: 12 of 26 (46%) vs. 12 of 58 (21%, P< 0.005).ConclusionCoronary vein anatomy may assist decision making about the need for LV lead stabilization, and the choice of tools during the implanting procedure to ensure effective CRT delivery at long term. © The Author 2013
New left ventricular active fixation lead: The experience of lead extraction
Full text linkAbstractLeft ventricular active fixation lead is fundamental for targeted pacing site. The challenge is the extraction but in our experience Attain® Stability™ was removed without any problem. As usual the lead can cause a thrombosis of the coronary vein but we performed a venoplasty in order to place again a lead in the target site and maintain the CRT response
BLOCK HF: How far does it extend indications for cardiac resynchronization therapy?
No full textThe Biventricular versus Right Ventricular Pacing in Heart Failure Patients with Atrioventricular Block (BLOCK HF) trial, published in April 2013 [Curtis AB, Worley SJ, Adamson PB, et al; Biventricular versus Right Ventricular Pacing in Heart Failure Patients with Atrioventricular Block (BLOCK HF) Trial Investigators. Biventricular pacing for atrioventricular block and systolic dysfunction. N Engl J Med 2013; 368:1585-1593], explored whether cardiac resynchronization therapy (CRT) was superior to conventional pacing in patients with conventional indications for pacing, left ventricular dysfunction and NYHA (New York Heart Association) class I-III. The trial took 8 years and a source of concern is selection bias, because participating centers had an average of two patients enrolled per center, per year. Both the internal and external validity of the trial merit some comments. BLOCK HF showed a relatively low treatment effect of CRT as compared with other CRT trials. As a matter of fact, the absolute risk reduction for death or hospitalization because of heart failure was 4.8%, in a relatively long follow-up, with a number needed to treat (NNT) of 21, much higher than the NNT of other CRT trials. We estimate that at least one third of patients in BLOCK HF could meet current indications for CRT. Moreover, the study did not consider the additional risks and costs of CRT versus conventional pacing, both having important implications for cost-effectiveness estimates. For these and other reasons, uncertainties arise as to how far BLOCK HF extends current recommendations for CRT and how much it should be implemented in daily clinical practice
Atrial Fibrillation in Patients with Cardiac Resynchronization Therapy: Clinical Management and Outcome
No full textAtrial fibrillation (AF) and heart failure (HF) are two emerging epidemics in the cardiovascular field and are strictly inter-related since may directly predispose to each other. Cardiac resynchronization therapy (CRT) has emerged as an important therapeutic option for selected HF patients with LV dysfunction and ventricular dyssynchrony. However almost all RCTs demonstrated the CRT effectiveness in patients in sinus rhythm (SR), including permanent AF among the exclusion criteria. In patients with paroxysmal or persistent AF strategies for rhythm control can be applied, but usually with limited efficacy. Furthermore, rhythm control strategy did not result superior to rate-control in patients with heart failure. AF ablation in HF patients is usually performed only in selected centres. In patients with permanent or long-standing AF and a CRT device the option of AVN ablation offers the advantage of allowing >95% biventricular pacing. AF implies a harmful increase in thromboembolic risk. Detection of AF in patients treated with a CRT device is enhanced by device diagnostic capabilities, that allow detection of episodes of atrial tachyarrythmias, including silent AF. In these cases decision making on appropriate antithrombotic prophy/laxis has to consider clinical risk stratification, usually applying CHADS2 and CHA2DS2VASc scores. In summary, in order to maximise outcome, AF in patients with CRT prompts the need to appropriately decide on antithromboembolic prophylaxis (according to risk stratifications), as well as on rate and/or rhythm control strategies, with the aim to allow constant biventricular pacing. In this perspective, AVN ablation has an important role since by inducing pace-maker dependency guarantees continuous biventricular pacing
Cardiac resynchronization therapy: The conundrum of predicting response in the individual patient
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