Electric storm triggered by short-coupled premature ventricular complexes in a young patient with non-obstructive hypertrophic cardiomyopathy.

Ventricular arrhythmias are commonly associated with hypertrophic cardiomyopathy with and without midventricular obstruction. Although the overall prognosis is relatively good with an annual mortality rate <1%, the propensity to potentially fatal ventricular arrhythmias (ventricular tachycardia) is the most feared complication. Electrical storms are a severe manifestation of ventricular arrhythmias, with poor outcomes. In this report, we present a case of a young patient with non-obstructive hypertrophic cardiomyopathy who presents after a syncopal episode and is found to have an electric storm that is refractory to medical therapy.

Nonoperative Management of Iatrogenic Right Atrial Appendage Pseudoaneurysm During Catheter Ablation.

Atrial pseudoaneurysms are exceedingly rare. Cardiac pseudoaneurysms are at risk for rupture, which may be catastrophic and require emergent thoracotomy for definitive treatment. We report a case of right atrial appendage perforation during catheter ablation leading to tamponade and right atrium pseudoaneurysm.

Acute Formation of Thrombus on a Left Atrial Appendage Occlusion Device Immediately After Detachment.

Clots can form on the left atrial surface of left atrial appendage closure devices, with subsequent thromboembolization. However, we are unaware of any reports of clots forming on the devices immediately after deployment. We report a case where an acute thrombus strand formed at the tip of an occlusion device immediately after deployment. (Level of Difficulty: Intermediate.).

Epicardial Ablation as a Treatment of Recurrent Ventricular Tachycardia Originating From a Left Ventricular Aneurysm: A Case Report and Review of the Literature.

Catheter ablation (CA) is an important therapeutic modality for the management of ventricular tachycardia (VT). In some patients, CA may be ineffective because of the inability to reach the effective target site from the endocardial surface. Partly, this is due to the effect of the transmural extent of the myocardial scars. The operator's ability to map and ablate the epicardial surface has enhanced our understanding of scar-related VT in various substrate states. A left ventricular aneurysm (LVA) that develops after myocardial infarction may increase the risk of VT. Endocardial ablation alone of LVA may be insufficient in preventing recurrent VT. Numerous studies have demonstrated greater freedom from recurrence with adjunctive epicardial mapping and ablation via a percutaneous subxiphoid technique. Currently, epicardial ablation is performed predominantly at high-volume tertiary referral centers via the percutaneous subxiphoid approach. In this review, we first report a case of a man in his 70s with ischemic cardiomyopathy, a large apical aneurysm, and recurrent VT status post-endocardial ablation who presented with incessant VT. The patient underwent successful epicardial ablation over the apical aneurysm. Second, our case showcases the percutaneous approach and underscores its clinical indications and potential complications.

Suitability of the left internal jugular vein for CRT-D placement in the setting of extensive venous occlusion: Case report and review of the literature.

Placement of coronary sinus (CS) leads is predominantly accomplished via the left cephalic-axillary-subclavian venous system. However, vein stenosis or occlusion from long-term chronic hemodialysis (HD) in patients with end-stage renal failure can pose a challenge. Cannulation of the CS via the left internal jugular vein (IJV) is technically difficult but often feasible. We report a case in which a patient with end-stage renal disease (ESRD) had extensive left venous system occlusion from prior in dwelling HD catheters, and an AV fistula contralaterally, who underwent biventricular implantable cardioverter defibrillator placement with lead insertion through the left IJV.

Left atrial appendage occlusion with Watchman device after incomplete surgical ligation.

Non-valvular atrial fibrillation (NVAF) is the most common cause of cardioembolic stroke. The left atrial appendage (LAA) is the major source of cardiac emboli in patients with NVAF. Anticoagulation (AC) is the standard of care for stroke prevention in atrial fibrillation (AF), but many patients are intolerant of AC. Surgical exclusion of the LAA may result in incomplete closure and is associated with an increased risk of embolism. We report a case of a woman in her 50s with a history of persistent AF, mitral valve prolapse s/p repair with surgical LAA exclusion, and multifocal haemorrhagic stroke presented for elective LAA closure who underwent a Watchman placement successfully. This case demonstrates that a percutaneous approach for occlusion of the LAA when surgical exclusion was incomplete may be feasible with appropriate planning. Clinical outcome data for this patient group are needed.

Worldwide Survey of COVID-19-Associated Arrhythmias.

[Figure: see text].

Restructuring Electrophysiology During the COVID-19 Pandemic: A Practical Guide From a New York City Hospital Network.

The coronavirus disease 2019 crisis is a global pandemic of a novel infectious disease with far-ranging public health implications. With regard to cardiac electrophysiology (EP) services, we discuss the "real-world" challenges and solutions that have been essential for efficient and successful (1) ramping down of standard clinical practice patterns and (2) pivoting of workflow processes to meet the demands of this pandemic. The aims of these recommendations are to outline: (1) essential practical steps to approaching procedures, as well as outpatient and inpatient care of EP patients, with relevant examples, (2) successful strategies to minimize exposure risk to patients and clinical staff while also balancing resource utilization, (3) challenges related to redeployment and restructuring of clinical and support staff, and (4) considerations regarding continued collaboration with clinical and administrative colleagues to implement these changes. While process changes will vary across practices and hospital systems, we believe that these experiences from 4 different EP sections in a large New York City hospital network currently based in the global epicenter of the coronavirus disease 2019 pandemic will prove useful for other EP practices adapting their own practices in preparation for local surges.

Techniques for successful early retrieval of the Micra transcatheter pacing system: A worldwide experience.

BACKGROUND: Experience with retrieval of the Micra transcatheter pacing system (TPS) is limited because of its relatively newer technology. Although abandonment of the TPS at end of life is recommended, certain situations such as endovascular infection or device embolization warrant retrieval. OBJECTIVE: The purpose of this study was to report the worldwide experience with successful retrieval of the Micra TPS. METHODS: A list of all successful retrievals of the currently available leadless pacemakers (LPs) was obtained from the manufacturer of Micra TPS. Pertinent details of retrieval, such as indication, days postimplantation, equipment used, complications, and postretrieval management, were obtained from the database collected by the manufacturer. Other procedural details were obtained directly from the operators at each participating site. RESULTS: Data from the manufacturer consisted of 40 successful retrievals of the Micra TPS. Operators for 29 retrievals (73%) provided the consent and procedural details. Of the 29 retrievals, 11 patients underwent retrieval during the initial procedure (immediate retrieval); the other 18 patients underwent retrieval during a separate procedure (delayed retrieval). Median duration before delayed retrieval was 46 days (range 1-95 days). The most common reason for immediate retrieval was elevated pacing threshold after tether removal. The most common reasons for delayed retrieval included elevated pacing threshold at follow-up, endovascular infection, and need for transvenous device. Mean procedure duration was 63.11 ± 56 minutes. All retrievals involved snaring via a Micra TPS delivery catheter or steerable sheath. No serious complications occurred during the reported retrievals. CONCLUSION: Early retrieval of the Micra TPS is feasible and safe.

Impact of transesophageal echocardiography on clinical management of patients over age 50 with cryptogenic stroke and normal transthoracic echocardiogram.

BACKGROUND: The utility of transesophageal echocardiography (TEE) subsequent to a normal transthoracic echocardiogram (TTE) in older patients with an unexplained stroke is uncertain. METHODS: Two hundred sixty-three consecutive patients over the age of 50 years hospitalized with a clinical stroke confirmed with brain magnetic resonance imaging and a normal TTE were retrospectively analyzed. Patients with atrial fibrillation, atrial flutter, or any other causative reason for stroke were excluded. TEE was analyzed for findings that could explain the etiology of stroke as well as findings that would change therapy based on current guidelines. RESULTS: Baseline characteristics included a mean age of 66.7 years (range, 50-91 years); 42.5% of patients were female. A possible etiology of stroke was discovered by TEE in 111 (42.2%) patients and included 1 or more of the following: complex plaque of the ascending aorta or arch, patent foramen ovale, atrial septal aneurysm, both atrial septal aneurysm and patent foramen ovale, or spontaneous contrast. Only 1 patient (0.4%) had a finding that changed immediate management, which was a thrombus in the left atrial appendage for which anticoagulation was prescribed. Follow-up was available at 6 months on 85 patients, of whom 13 (15%) had been discovered to have developed atrial fibrillation. CONCLUSION: In our study population, when performed subsequent to a normal TTE in patients aged >50 years with cryptogenic stroke, TEE demonstrated a high diagnostic value, but had minimal incremental effect on patient management.

PERSISTENT ELEVATION OF NEUTROPHIL/LYMPHOCYTE RATIO ASSOCIATED WITH NEW ONSET ATRIAL FIBRILLATION FOLLOWING PERCUTANEOUS CORONARY INTERVENTION FOR ACUTE ST SEGMENT ELEVATION MYOCARDIAL INFARCTION.

BACKGROUND: Increasing evidence suggests that inflammation plays an important role in initiation and maintaining of atrial fibrillation (AF). The Neutrophil to Lymphocyte (N/L) Ratio is an easily derived and readily available parameter that has emerged as marker of inflammation with predictive and prognostic value. We investigated the association between N/L ratio and incidence of atrial fibrillation in patients undergoing cardiac catheterization for acute ST-segment elevation myocardial infarction (STEMI. METHODS: This cross sectional descriptive study was carried out at New York Hospital Queens. We retrospectively analysed clinical, hematologic and angiographic data of 290 patients who underwent coronary angiography with stent placement for acute ST-segment elevation myocardial infarction between 2008-2011. RESULTS: Study cohort of 290 patients had mean age 63.3 +/- 13.0 years consisting of 81.4% male. The N/L ratio was measured at time points: <6 hours precatheterization, <12, 48 and 96 hours post catheterization. Patients who developed AF (n=40, 13.8%), had higher post catheterization N/L ratios at 48 hours (median 5.23 vs. 3.00, p=0.05) and 96 hours (median 4.67 vs. 3.56, p=0.03), with no differences in the immediate pre and post procedural measurements, <6 hours pre catheterization (median 2.49 vs. 2.82, p=0.467) and <12 hours post catheterization (median 5.93 vs. 5.03, p=0.741) respectively. CONCLUSION: In conclusion, these findings support an inflammatory aetiology contributing to new onset AF following percutaneous coronary intervention for acute STEMI. Further studies are warranted to elucidate these findings.

Inappropriate mode switching clarified by using a chest radiograph.

An 80-year-old woman with a history of paroxysmal atrial fibrillation and atrioventricular node disease status post-dual chamber pacemaker placement was noted to have abnormal pacing episodes during a percutaneous coronary intervention. Pacemaker interrogation revealed a high number of short duration mode switching episodes. Representative electrograms demonstrated high frequency nonphysiologic recordings predominantly in the atrial lead. Intrinsic pacemaker malfunction was excluded. A chest radiograph showed excess atrial and ventricular lead slack in the right ventricular inflow. It was suspected that lead-lead interaction resulted in artifacts and oversensing, causing frequent short episodes of inappropriate mode switching.

Dofetilide induced torsade de pointes: mechanism, risk factors and management strategies.

Dofetilide is an effective antiarrhythmic agent for conversion of atrial fibrillation and atrial flutter as well as maintenance of sinus rhythm in appropriately selected patients. However, as with other antiarrhythmic agents, proarrhythmia is a known adverse effect. The risk of dofetilide induced torsade de pointes (Tdp) is low when used with strict dosing criteria guided by renal function, QT interval and concomitant drug therapy. Benefit from dofetilide use must be individualized and weighed against the side effects and the role of other available treatment options. In this review, we discuss the underlying mechanism, risk factors and precautionary measures to avoid dofetilide induced QT prolongation and ventricular tachycardia/Tdp. We suggest a scheme for the management of QT prolongation, ventricular arrhythmia and Tdp as well.

Coexistent Brugada Syndrome and Wolff-Parkinson-White Syndrome: What is the Optimal Management?

Coexistent Brugada syndrome and Wolff-Parkinson-White (WPW) syndrome is rare, and as such poses management challenges. The overlap of symptoms attributable to each condition, the timing of ventricular stimulation after accessory pathway ablation and the predictive value of programmed stimulation in Brugada syndrome are controversial. We describe a case of coexistent Brugada syndrome and WPW syndrome in a symptomatic young adult. We discuss our treatment approach and the existing literature along with the challenges in management of such cases.

Primary prevention of sudden cardiac death in silent cardiac sarcoidosis: role of programmed ventricular stimulation.

BACKGROUND: Cardiac involvement in sarcoidosis is often silent and may lead to sudden death. This study was designed to assess the value of programmed electric stimulation of the ventricle (PES) for risk stratification in patients with sarcoidosis and evidence of preclinical cardiac involvement on imaging studies. METHODS AND RESULTS: Patients with biopsy-proven systemic sarcoidosis but without cardiac symptoms who had evidence of cardiac sarcoidosis on positron emission tomography (PET) or cardiac MRI (CMR) were included. All patients underwent baseline evaluation, echocardiographic assessment of left ventricular function, and programmed electric stimulation of the ventricle. Patients were followed for survival and arrhythmic events. Seventy-six patients underwent PES of the ventricle. Eight (11%) were inducible for sustained ventricular arrhythmias and received an implantable defibrillator. None of the noninducible patients received a defibrillator. Left ventricular ejection fraction was lower in patients with inducible ventricular arrhythmia (36.4±4.2% versus 55.8±1.5%, P<0.05). Over a median follow-up of 5 years, 6 of 8 patients in the group with inducible ventricular arrhythmias had ventricular arrhythmia or died, compared with 1 death in the negative group (P<0.0001). CONCLUSIONS: In patients with biopsy-proven sarcoidosis and evidence of cardiac involvement on PET or CMR alone, positive PES may help to identify patients at risk for ventricular arrhythmia. More importantly, patients in this cohort with a negative PES appear to have a benign course within the first several years following diagnosis. PES may help to guide the use of implantable cardioverter defibrillators in this population.