Avoidable Complication of Defibrillator Implantation: Retained Operative Sponge

This PA and Lateral CXR was taken the day after an uneventful defibrillator implantation. I have saved these images for close to a decade as I never wanted to forget this is always a possibility. In full disclosure, this was not a procedure I performed.

This was an eye opening case of an operative sponge left in the pocket. As I recall, the patient was very gracious and sponge was extracted uneventfully the following day. Years later a practice partner of mine called me about an interesting case he was doing on a generator change in a can that went ERI at 8 years. He found an oddly healing pocket and ultimately dissected this sponge (see following picture) out from the pocket. Amazing that the pocket healed at all though clearly the pocket was very abnormal.

New Book Available for Patients Needing a Defibrillator

What is a Defibrillator? Cover

A defibrillator implant is a small device surgically implanted in the chest to maintain the heart’s electric rhythm. The surgery is very common: over 130,000 Americans receive a defibrillator implant every year.

If you or a loved one requires a defibrillator implant, you’ll undoubtedly have many questions—questions that can’t always be adequately explained in a forty-five minute doctor’s appointment. I recently published a complete, easy-to-understand guide to defibrillator implantation.

What Is a Defibrillator? begins with an explanation of how defibrillators work and the conditions they treat. I then discuss how doctors determine whether patients are good candidates for defibrillators and provides an overview of the implantation process. Potential complications both before and after defibrillator implantation are discussed, as is surgical recovery and follow-up treatment. For readers having difficulty with medical terminology, there is a helpful glossary at the back of the book.

Patients, caregivers, and family members alike will benefit from these straightforward explanations. If you’re a candidate for defibrillator implantation, this book can help you approach surgery with a full understanding of the procedure and what it means to your quality of life.

What is a Defibrillator? is available in print and electronic versions at Amazon.com (http://www.amazon.com/What-Defibrillator-Cardiologists-Patients-Providers-ebook/dp/B011EXAQL4/ref=sr_1_4?s=digital-text&ie=UTF8&qid=1438283493&sr=1-4).

Are specialty hospitals more or less relevant as we move towards value-based care?

A recent article from The Advisory Board Company found a group of hospitals that had an advantage when it came to providing an excellent patient experience: specialty hospitals. An Advisory Board analysis of recent Hospital Compare data suggests that specialty hospitals dominate the rankings when it comes to patient satisfaction.

Patient satisfaction may not be the only benefit of a specialty hospital or “center of excellence.”  We examined the demographics, complications, re-admissions, and accessibility of care in a community electrophysiology (EP) program to add to the body of knowledge of ‘real-world’ EP device implant complications. Two hundred and fifty consecutive patients who underwent device implantation by a single electrophysiologist in a new non-academic community hospital EP program starting from its inception in July 2008 were included for analysis. Standard procedures for implantation were used. Pacemakers, defibrillators, and generator changes were included; temporary pacemakers were excluded. Major complications were defined as in-hospital death, cardiac arrest, cardiac perforation, cardiac valve injury, coronary venous dissection, hemothorax, pneumothorax, transient ischemic attack, stroke, myocardial infarction, pericardial tamponade, and arteriovenous fistula. Minor complications were defined as drug reaction, conduction block, hematoma or lead dislodgement requiring re-operation, peripheral embolus, phlebitis, peripheral nerve injury, and device-related infection. This community cohort had similar ejection fractions but was older with worse kidney function than those studied in prior reports. There was one major early complication (0.4%) and seven minor early complications (2.8%). Left ventricular lead placement was successful in 64 of 66 patients (97%). This was the first community-hospital based EP program to examine device implant demographics and outcomes, and revealed an elderly, ill population with lower overall rates of complications than seen in national trials and available reports from single non-community centers. Contrary to current perceptions, these data suggest that community centers may subselect an elderly, ill patient population and can provide high-quality, cost-effective, and more accessible care.

 

“Specialty hospitals are under increasing scrutiny, but there may be a role for ‘niche’ hospitals that, while offering the full spectrum of general hospital care, can provide certain procedures at an exceptional level of quality and cost-effectiveness. Recent literature continues to document the paucity of data available on rates and predictors of ICD implantation in routine clinical practice.(24,25) The Ontario ICD Database (24) revealed major complications related to de novo defibrillator implantations in 4.1% of procedures. Adjusting our data to match their definition of major complications, our center had major complications in 1.0% of de novo defibrillator implantations (a 76% relative reduction in major complications). The cost of major complications among Medicare beneficiaries receiving implantable defibrillators was examined in 30,984 patients.(25) They found that 10.8% of patients experienced one or more complications resulting in an increase in length of stay by 3.4 days and costs by $7,251. Superiorly performing ‘niche’ hospitals that reduce major complication rates from defibrillator implants by 76% in the uS (conservative estimate of 100,000 yearly implants) could realize an estimated $60 million in cost savings while improving patient safety.” (Williams et al, 2010, full link to reference below)

Demographics and complication rates seen in this report versus those reported from non-community centers and national trials.
Demographics and complication rates seen in this report versus those reported from non-community centers and national trials.

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Tunneled Left Ventricular Lead During Upgrade to a Biventricular Defibrillator

A very active octogenarian with history of ischemic cardiomyopathy, CAD status post bypass surgery and congestive heart failure (CHF) presented for evaluation. He had a dual chamber defibrillator (ICD) implanted in 2006 because of sustained ventricular tachycardia (VT).  His ejection fraction was 10-15% with extensive infarct and no evidence of ischemia on stress test.  He was having shortness of breath with mild exertion (and resting at times) giving him Class 3/4 CHF.  His electrocardiogram showed left bundle branch block and QRS duration of 160msec.

He was scheduled for upgrade of his defibrillator to a biventricular defibrillator with the addition of a left ventricular (LV) lead placed percutaneously in his coronary sinus.  Of note, his initial right ventricular ICD lead (Medtronic Sprint Fidelis) had to be replaced several years ago.  His in-situ ICD still had battery life and the decision was made to assess coronary sinus and left subclavian patiency prior to opening the ICD incision and risking device infection.  Peripheral venogram of his left upper extremity revealed an occluded left subclavian vein in the midline (see Figure).

L Subclav Veno

Right femoral venous access was obtained and a 5French deflectable octapolar EP catheter was used to document coronary sinus patency.  At this point, access to the left subclavian vein was attempted with the EP catheter without success.  A local venogram was then performed using a 5French multipurpose catheter and once again demonstrated an occluded left subclavian vein from the contralateral approach. See Figure below.

Local Venogram

Given the patient’s extreme age, the decision was made not to attempt opening his chronic left subclavian venous occlusion or attempt laser lead extraction of the abandoned RV lead.  We opted to place a coronary sinus LV lead via a patent right subclavian vein and percutaneously tunnel the lead to his existing left sided device.  A 2cm incision was made in the right infraclavicular region and LV lead was placed without difficulty in a posterolateral branch of the coronary sinus.  This lead was anchored to the right prepectoral fascia then tunneled subcutaneously to the exisiting left infraclavicular lead system.  Tunneling was performed without incident and the patient underwent a successful upgrade to a biventricular defibrillator.  The figure below depicts the chest xray and course of the tunneled LV lead. There was minimal postoperative discomfort along the course of the tunneled lead.

PA CXR of Tunneled LV Lead

Ventricular Fibrillation after Elective Percutaneous Coronary Intervention

Case Description:

A 60 year old with past medical history of tobacco abuse was admitted for evaluation of chest pain without significant electrocardiogram (ECG) changes, electrolyte abnormalities or troponin elevation. Stress test revealed fixed inferolateral defects with EF44% and associated hypokinesis. Interestingly, an echocardiogram revealed an EF 55-60% with no regional wall motion abnormalities. Catheterization revealed an obstructive lesion in the PDA that had drug eluting stent successfully placed. Approximately one hour after stent placement routine ECG did not reveal any significant acute changes and patient was asymptomatic (see Figure 1). Approximately 150min after stent placement, the patient had an episode of ventricular fibrillation (VF) that required an external DC cardioversion (see Figure 2). Repeat cardiac catheterization did not reveal stent thrombosis or spasm. The patient underwent an uncomplicated single chamber defibrillator placement the following day.

Figure 1.  EKG Prior to VF Arrest

 

Figure 2.  Telemetry Strip Showing the VF Arrest

 

Discussion:

VF arrest during PCI has been reported to have an incidence of 2.1% with higher incidence of VF during right coronary artery PCI. (HUA02) VF arrest during PCI is most commonly precipitated by contrast, ischemia from coronary dissection, embolism, spasm, or catheter manipulation and occurs during the cardiac catheterization. (NIS84) VF arrest after elective percutaneous coronary intervention (PCI) is uncommon. Indeed, an examination of 19,497 patients undergoing PCI revealed a 0.84% incidence of VF and no episodes of VF arrest temporally unrelated to vessel injection were reported. (ADD05) Survivors of VF arrest in the setting of myocardial infarction (MI) have similar mortality to those not experiencing VF arrest during acute MI. (DEJ09) In contrast, mortality in survivors of in-hospital cardiac arrest has been reported as high as 47% during a median followup of 1.3 years. (HEL11) It is unclear if the mechanism of VF arrest in our patient is secondary to PCI or rather a primary VF arrest. There is a prior report of delayed three vessel coronary spasm in a patient receiving paclitaxel drug-eluting stents however, coronary spasm was demonstrated on repeat catheterization in that report. (KIM05) Our patient did not report any ischemic symptoms preceding his VF arrest (though his EKG had subtle ST changes suggesting possible ischemia) nor did his repeat catheterization reveal vessel thrombosis, spasm, or dissection. Additionally, peri- and post-procedural myocardial injury from slow coronary flow, microvascular embolization, and elevated levels of troponin causing reperfusion tissue damage and cardiac dysfunction leads to worse long-term prognosis than those without myocardial injury (ISH08); our patient did not have significantly elevated pre- or post-procedure troponin levels. The time course of ischemia-induced reperfusion changes is likely less than 30minutes based upon prior experimental models of ischemia. (WIL08) Five minutes of coronary artery occlusion avoids increased risk of ventricular arrhythmias in animals and 30 minutes is appropriate for adequate reperfusion. (DAV81,DAV82,RUF79,WIL08) When the left anterior descending artery is transiently occluded in dogs, there is an initial (t=0-2minutes) small decrease in peak R wave amplitude and conduction velocity followed by a large increase in these indices over the ensuing 1-2minutes. (HOL76) There is a rapid return to baseline when occlusion is released and reperfusion occurs. This biphasic response has also been documented in dogs undergoing circumflex artery occlusions lasting 5minutes. (DAV81,DAV82) However, Ruffy et al (RUF79) found that LAD occlusions for 5 minutes in the dog resulted in a decrease in electrogram R wave amplitudes with no biphasic response. The progressive decrease in R wave amplitude (with the subsequent increase in amplitude) has been demonstrated in isolated rabbits hearts during global ischemia over 10 minutes (KAB89), isolated pig hearts during LAD occlusions for 5 minutesJAN86, and humans subject to 60minutes of unresolved ischemia. (VAI94) Of note, these electrical alterations were rapidly reversible upon reperfusion. (HOL76,RUF79,KAB89,JAN86) In summary then, our patient experienced a VF arrest 150min after elective PCI without conclusive evidence of procedural-related ischemia and well outside the conventional 30min window of reperfusion electrical alterations seen in experimental models. The role of defibrillator implantation as secondary prevention in patients like this is unclear.

References:

HUA02 Huang JL, Ting C-T, Chen Y-T, Chen S-A, “Mechanisms of ventricular fibrillation during coronary angioplasty: increased incidence for the small orifice caliber of the right coronary artery,” International Journal of Cardiology, Volume 82, Issue 3 (March 2002), pp. 221-228.

NIS84 Nishimura RA, Holmes DR Jr, McFarland TM, Smith HC, Bove AA, “Ventricular arrhythmias during coronary angiography in patients with angina pectoris or chest pain syndromes,” Am J Cardiol. V. 53, No. 11 (June 1984), pp. 1496-9.

ADD05 Addala S. Kahn JK, Moccia TF, Harjai K, Pellizon G, Ochoa A, O’Neill WW, “Outcome of Ventricular Fibrillation Developing During Percutaneous Coronary Interventions in 19,497 Patients Without Cardiogenic Shock,” Am J Card, V. 96 (2005), pp. 764-765.

HEL11 Helton TJ, Nadig V, Subramanya SD, Menon V, Ellis SG, Shishehbor MH, “Outcomes of cardiac catheterization and percutaneous coronary intervention for in-hospital VT/VF cardiac arrest, Catheter Cardiovasc Interv, [Epub ahead of print], (July 6, 2011).

DEJ09 DeJong JSSG, Marsman RFHenriques JPS, Koch KT, de Winter RJ, Tanck MWT, Wilde AAM, Dekker LRC, “Prognosis among survivors of primary ventricular fibrillation in the percutaneous coronary intervention era,” Am Heart J, V. 158, No. 3 (September 2009), pp. 467-472.

KIM05 Kim JW, Park CG, Seo HS, Oh DJ, “Delayed severe multivessel spasm and aborted sudden death after Taxus stent implantation,” Heart, V. 91, No. 2 (Feb 2005 Feb), e15.

ISH08 Ishiia H, Amanoa T, Matsubarabv T, Murohara T, “Pharmacological Prevention of Peri-, and Post-Procedural Myocardial Injury in Percutaneous Coronary Intervention,” Current Cardiology Reviews, V. 4. No. 3 (August 2008), pp. 223-230.

WIL08 Williams JL, Mendenhall GS, Saba S, “Effect of Ischemia on Implantable Defibrillator Intracardiac Shock Electrograms,” J Cardiovasc Electrophysiology, Vol. 19, No. 3 (March 2008), pp. 275-281.

DAV81 David D, Naito M, Chen CC, Michelson EL, Morganroth J, Schaffenburg M, “R-wave Amplitude Variations During Acute Experimental Myocardial Ischemia: An Inadequate Index for Changes in Intracardiac Volume,” Circulation, V. 63, No. 6 (June 1981), pp. 1364-1370.

DAV82 David D, Naito M, Michelson EL, Watanabe Y, Chen CC, Morganroth J, Schaffenburg M, Blenko T, “Intramyocardial Conduction: A Major Determinant of R-wave Amplitude During Acute Myocardial Ischemia,” Circulation, V. 65, No. 1 (January 1982), pp. 161-167.

RUF79 Ruffy R, Lovelace DE, Mueller TM, Knoebel SB, Zipes DP, “Relationship between Changes in Left Ventricular Bipolar Electrograms and Regional Myocardial Blood Flow during Acute Coronary Artery Occlusion in the Dog,” Circulation Research, V. 45, No. 6 (December 1979), pp. 764-770.

HOL76 Holland RP, Brooks H, “The QRS Complex during Myocardial Ischemia,” Journal Clinical Investigation, V. 57 (March 1976), pp. 541-550.

KAB89 Kabell G, “Ischemia-Induced Conduction Delay and Ventricular Arrhythmias: Comparative Electropharmacology of Bethanidine Sulfate and Bretylium Tosylate,” Journal Cardiovascular Pharmacology, V. 13, No. 3 (1989), pp. 471-482.

VAI94 Vaitkus PT, Miller JM, Buxton AE, Josephson ME, Laskey WK, “Ischemia-induced changes in human endocardial electrograms during percutaneous transluminal coronary angioplasty,” American Heart Journal, V. 127, No. 6 (June 1994), pp. 1481-1490.

JAN86 Janse MJ, “Electrophysiology and electrocardiology of acute myocardial ischemia,” Can J Cardiology, Supp. A (July 1986), pp. 46A-52A.

Can Wireless Charging be a Disruptive Force in the Medical Device Industry?

Nokia has introduced a smart phone that can charge itself wirelessly. (http://www.nokia.com/global/products/lumia/)  It is safe to assume that Nokia uses induction based technology to charge the phone. The phone (equipped with a special receiver) is placed on a mat that generates an electromagnetic field. The phone’s special receiver uses this electromagnetic field to charge the phone’s battery. This technology can only power one device at a time and may generate heat during the charging process.

Recently, IDT and Intel partnered to announce the development of an integrated transmitter and receiver chipset for Intel’s wireless charging technology based on resonance technology. (IDT and Intel Partnership)  Magnetic resonance uses electrical components (a coil and a capacitor) to create magnetic resonance. This resonance can then transmit electricity to the receiver (device to be charged) from the transmitter (charging base). Magnetic resonance can power multiple devices at a time and may not generate excessive heat. A nice summary of this technology is available at Fujitsu Summary of Wireless Charging.

These technologies can be disruptive forces in the medical device industry that rely on battery depletion and replacement for subsequent sales (e.g., pacemakers, defibrillator, and noncardiac pulse generators). The device company that incorporates wireless charging into their devices may minimize replacement procedures for patients (and limiting procedural risk) while at the same time stabilizing their market position. Future device upgrades may be software upgrades and licensing that can be performed wirelessly without need for invasive procedure.

Complications of Pacemaker Implantation

Approximately 180000 patients undergo pacemaker implantation in the U.S each year [1]. In addition, the extreme elderly are the most rapidly growing segment of the U.S. [2,3] and pacemakers are commonly implanted in this population. There are reports of pacemaker implant complications (generally clinical trials reporting outcomes and incident complication rates) and fewer reports of complication rates in the extreme elderly (with a persistent exclusion of elderly patients from ongoing clinical trials [4]). A comprehensive review of pacemaker implant complications can help improve informed consent in preoperative patients. Major and minor complications are defined based upon prior reports of device-related complications. [5,6,7,8] Major complications have been defined as death, cardiac arrest, cardiac perforation, cardiac valve injury, coronary venous dissection, hemothorax, pneumothorax, transient ischemic attack, stroke, myocardial infarction, pericardial tamponade, and arterial-venous fistula. Minor complications have been defined as drug reaction, conduction block, hematoma or lead dislodgement requiring reoperation, peripheral embolus, phlebitis, peripheral nerve injury, and device-related infection. This chapter will include discussion of common and uncommon complications of pacemaker implantation including associated incidence as well as the associated radiographs and common clinical signs of these complications.
Complications of Pacemaker Implantation