Infected endocardial pacemaker electrodes: successful open intracardiac removal

Coverage Strategies in Exposed Implants

Implants are widely used and are not without complications. The most serious complication is infection with consequent exposure of the implant and is characterized by increased morbidity and mortality. Until recently, infected implants were removed and replaced with another one. These operations are accompanied by increased morbidity and might result in permanent disability. Coverage of the implant with a flap is an alternative solution. The objective of this article is to study the effectiveness of muscle or myocutaneous flaps in covering infected and exposed implants. A series of 17 patients with infected implants, which were treated with coverage of the implant with muscle or myocutaneous flap, is presented. Eight patients had an orthopedic implant, seven a vascular implant, and two had a pacemaker. The flaps ensured immediate coverage of the implant and the biologic ability of eliminating the infectious process with the increased concentration of antibiotics resulting from increased blood flow of the muscle. In all the patients, the implants were preserved and the infectious process was eliminated. The use of muscle and myocutaneous flaps in the treatment of infected implants is therefore effective and in some cases it is superior to other methods because of lower morbidity and cost.

[ICD lead defects: diagnosis and therapeutical options]

The number of cardioverter/defibrillator (ICD) implantations has been steadily increasing; thus, ICD lead-associated complications are an important issue. No clear recommendations for the diagnosis and management are available. This article gives an overview of how to diagnose and manage an ICD lead defect. Possible therapeutic options are discussed by reviewing the literature.

Surgical extraction of infected pacemaker leads after cardiac surgery

Surgical extraction of permanent pacemaker leads is performed when noninvasive extraction is felt to be unsafe or has been unsuccessfully attempted. Surgical extraction in patients with previous cardiac surgery presents a particular challenge as re-sternotomy is hazardous and the presence of surgical adhesions makes video-assisted approaches difficult. We report 2 cases of successful deployment of a surgical technique using femorofemoral cardiopulmonary bypass and right anterior thoracotomy for removal of pacemaker leads.

[Secondary infections after pacemaker implantation]

INTRODUCTION

Infectious complications following pacemaker implantation are not common but may be particularly severe. Localized wound infections at the site of implantation have been reported in 0.5% of the cases in the most recent series, with an average of about 2%. The incidence of septicemia and infectious endocarditis is lower, about 0.5% of the cases. The operator's experience, the duration of the procedure and repeat procedures are considered to be predisposing factors.

CURRENT KNOWLEDGE AND KEY POINTS

The main cause of these infections has been recently demonstrated to be local contamination during implantation. The commonest causal organism is Staphylococcus (75 to 92% of the cases), Staphylococcus aureus being the cause of acute infections (less than 6 weeks), whereas Staphylococcus epidermidis is associated with cases of secondary infection (more than 2 months). The usual clinical presentation is infection at the site of the pacemaker but other forms such as abscess, endocarditis, rejection of the implanted material, septic emboli or phlebitis have been described. The diagnosis is confirmed by local and systemic biological investigations and by echocardiography (especially transesophageal echocardiography) in cases of right heart endocarditis. There are two axes of treatment: bactericidal double antibiotherapy and surgical ablation of the infected material either percutaneously or by cardiotomy.

FUTURE PROSPECTS AND PROJECTS

A recent meta-analysis supported the role of systematic, preoperative, prophylactic antibiotic therapy in the prevention of these complications. These data should be confirmed by suitably powered clinical trials.

[Treatment of an infection from an intravenous cardiac stimulation lead with extracorporeal circulation]

The infection of a transvenous lead implanted for cardiac stimulation is a rare but serious complication, because it can lead to the development of septicemia, tricuspid endocarditis, recurrent pulmonary emboli or thrombus formation in right cardiac chambers. The most efficient treatment is the removal of the entire pacing system (generator and lead). We describe our experience with the removal of infected leads with the aid of cardiopulmonary bypass. Indications of this technique and its advantages and disadvantages over the percutaneous extraction methods are discussed. A review of the literature is also presented.

Cardiac pacemaker infection: surgical management with and without extracorporeal circulation

BACKGROUND

Pacemaker infections are rare, but serious complications of pacemaker therapy. The generator pocket, the pacing leads, or both may be involved.

METHODS

We report on 12 patients with infected pacemaker systems. Four patients suffered from localized generator pocket infections, 6 had infected leads, and 2 patients had both. Pacemaker systems were completely removed in all patients. When the infection was limited to the generator pocket, the pacemaker system was removed at the original implantation site. Extracorporeal circulation was employed for the explantation of infected pacing leads.

RESULTS

No complications occurred in patients with localized generator pocket infections. One patient with infected leads who was preoperatively already in a serious clinical condition died of septic shock in the early postoperative period; another patient died of pulmonary complications after tricuspid valve replacement 14 months after pacemaker explantation. No recurrent infections were observed.

CONCLUSIONS

Explantation of the complete pacemaker system has proved a reliable method to eradicate infection. Complications have been rare, except in patients in a critically ill state who undergo cardiopulmonary bypass.

The effect of nonisodiametric design on the ease of extracting chronically implanted pacemaker leads

Extracting permanently implanted transvenous pacemaker leads is often difficult because a fibrous sheath tends to trap the lead at various points along its course. Because many leads have bulbous or nonisodiametric portions, extraction may be rendered even more troublesome, because it is difficult to pull the larger portion through the narrow areas of the sheath. Furthermore, forceful extraction may have dire consequences, such as cardiac laceration. A study was undertaken in animals to evaluate the effect of lead isodiametricity on lead extraction. The results show that any increase in the diameter of the lead tip greatly reduces the ease of its removal. Consequently, leads designed to be isodiametric throughout their entire lengths will greatly enhance their removability.

Three-year experience with a stylet for lead extraction: a multicenter study

INTRODUCTION

The extraction of chronically implanted and infected pacemaker and defibrillator leads is an important issue. This article describes the experience gathered between 1990 and 1994 by seven European centers regarding a locking stylet that is uniformly applicable for a wide variety of internal pacing coil diameters. This interventional locking stylet for lead extraction has an outer diameter of 0.4 mm (0.016 inches). The stylet consists of a hollow shaft in which an inner traction wire is embedded. At the tip of the inner traction wire an anchoring mechanism, which can be opened by retraction, is applied. Removal attempts were made for 150 leads, 110 in ventricular and 40 in atrial positions.

RESULTS

Complete removal was possible in 122 cases (81%). Partial removal was possible in 18 cases (12%). Failure to remove the lead with the extraction stylet was experienced in 10 cases (7%). In seven patients, the leads were removed by cardiothoracic surgery; 3 defective leads were left in place. There were no serious complications associated with the procedure. None of the patients died.

CONCLUSION

The experience with this extraction stylet for lead removal has shown good results. Despite a low complication rate thus far, each case for lead removal should be judged on the individual basis of benefit-to-risk ratio.