Impact of high-grade atrioventricular block and cumulative frequent pacing on atrial arrhythmias.

BACKGROUND: The relationship between high-grade atrioventricular block (HGAVB) with cumulative frequent pacing and risk of atrial arrhythmias (AAs) has not been well characterized. We hypothesized HGAVB and pacing may have significant impact on incidence and prevalence of AAs by modulating atrial substrate. OBJECTIVE: To determine impact of HGAVB and pacing on AAs including atrial fibrillation (AF), atrial flutter (AFL), and atrial tachycardia (AT). METHODS: All consecutive patients who underwent dual-chamber pacemaker implantation for HGAVB from 2005 to 2011 at the University of Chicago were included. AAs and percent of pacing were detected through device interrogation. Patients' data were collected from electronic medical records and clinic visits. RESULTS: A total of 166 patients (mean age 71 ± 15 years; 54% female, 56% African American) were studied. AF was documented in 27% of patients before pacemaker implantation. During a mean 5.8 ± 2.2 years of follow-up, 47% had device-detected AF, 10% AFL, and 26% AT. New-onset AF was documented in 40 of the 122 patients without prior AF (33%). Continuous (≥ 99%) right ventricular pacing was associated with significantly decreased AF prevalence (34% vs 59%, P = 0.005), and correlated with lower incidence (26% vs 41%, P = 0.22). Pacing suppressed AF in 14% of patients with baseline AF; those patients had lower atrial pacing (3.2% vs 45%, P < 0.0001). Left atrial dilation was the only independent predictor of AF with frequent pacing (P = 0.009). CONCLUSIONS: HGAVB is associated with high incidence and prevalence of AAs with and without pacing. Cumulative frequent (≥99%) ventricular pacing reduces risk of AF in patients with HGAVB.

What Is the Clinical Utility of Intravascular Ultrasound?

PURPOSE OF REVIEW: This article reviews the contemporary evidence base for use of coronary intravascular ultrasound (IVUS). RECENT FINDINGS: Recent studies have strongly associated IVUS guidance during percutaneous coronary angioplasty (PCI) with lower major adverse cardiac events (MACE), stent thrombosis, and in selected groups, mortality. The PROSPECT study found in acute coronary syndromes patients, IVUS-determined minimal luminal area ≤ 4.0 mm2 and the presence of thin-cap fibroatheromas were independent predictors of future MACE in non-culprit lesions. A sub-analysis of the ADAPT-DES trial demonstrated significant reductions in stent thrombosis, myocardial infarction, and composite MACE in patients with IVUS-guided PCI versus angiography alone. In patients with cardiac allograft vasculopathy, IVUS measurements of intimal thickening and attenuated-signal plaque are associated with increased mortality. IVUS has become a ubiquitous and versatile adjunct to conventional angiography. It is a powerful tool for identification and assessment of atherosclerotic disease, guidance of percutaneous coronary intervention, and detection of cardiac allograft vasculopathy.

How Often Does Apical Sparing of Longitudinal Strain Indicate the Presence of Cardiac Amyloidosis?

Echocardiographic diagnosis of cardiac amyloidosis (CA) is frequently suggested by the presence of a left ventricular (LV) apical sparing pattern (ASP) on longitudinal strain (LS) assessment, the so-called "cherry on top" pattern, defined by strain magnitude preserved exclusively at the apex. However, it is unclear how frequently this strain pattern truly represents CA. This study aimed to evaluate the predictive value of ASP in the diagnosis of CA. We retrospectively identified consecutive adult patients who had the following studies performed within an 18-month period: (1) transthoracic echocardiogram and (2) either (a) cardiac magnetic resonance imaging, (b) Technetium-Pyrophosphate (PYP) imaging, or (c) endomyocardial biopsy. LS was retrospectively measured in the apical 4-, 3-, and 2-chamber views in patients who had adequate noncontrast images (n = 466). An apical sparing ratio (ASR) was calculated as (average apical strain)/[(average basal strain) + (average midventricular strain)]. Patients with ASR ≥1 were evaluated for the presence/absence of CA, using established criteria. Basic LV parameters were also measured. A total of 33 patients (7.1%) had ASP. Nine of these patients (27%) had "confirmed" CA, 2 (6.1%) "highly probable" CA, 1 (3.0%) "possible" CA, and 21 (64%) no evidence of CA. When comparing patients with and without confirmed CA, there were no significant differences in ASR, average global LS, ejection fraction, or LV mass. Patients with confirmed CA were older (76 ± 9 vs 59 ± 18 years, p = 0.01) and had thicker posterior wall (15 ± 3 vs 11 ± 3 mm, p = 0.004) with a trend toward thicker septal wall (15 ± 2 vs 12 ± 4 mm, p = 0.05). In conclusion, the presence of ASP on LS represents confirmed or highly probable CA in only 1/3 of patients and is more likely to indicate true CA in older patients with increased LV wall thickness. Although a larger, prospective study is needed to confirm these findings, 1/3 should be considered as a large diagnostic yield that justifies further testing, given the poor outcomes associated with CA diagnosis.

Network modulation during complex syntactic processing.

Complex sentence processing is supported by a left-lateralized neural network including inferior frontal cortex and posterior superior temporal cortex. This study investigates the pattern of connectivity and information flow within this network. We used fMRI BOLD data derived from 12 healthy participants reported in an earlier study (Thompson, C. K., Den Ouden, D. B., Bonakdarpour, B., Garibaldi, K., & Parrish, T. B. (2010b). Neural plasticity and treatment-induced recovery of sentence processing in agrammatism. Neuropsychologia, 48(11), 3211-3227) to identify activation peaks associated with object-cleft over syntactically less complex subject-cleft processing. Directed Partial Correlation Analysis was conducted on time series extracted from participant-specific activation peaks and showed evidence of functional connectivity between four regions, linearly between premotor cortex, inferior frontal gyrus, posterior superior temporal sulcus and anterior middle temporal gyrus. This pattern served as the basis for Dynamic Causal Modeling of networks with a driving input to posterior superior temporal cortex, which likely supports thematic role assignment, and networks with a driving input to inferior frontal cortex, a core region associated with syntactic computation. The optimal model was determined through both frequentist and Bayesian Model Selection and turned out to reflect a network with a primary drive from inferior frontal cortex and modulation of the connection between inferior frontal cortex and posterior superior temporal cortex by complex sentence processing. The winning model also showed a substantive role for a feedback mechanism from posterior superior temporal cortex back to inferior frontal cortex. We suggest that complex syntactic processing is driven by word-order analysis, supported by inferior frontal cortex, in an interactive relation with posterior superior temporal cortex, which supports verb argument structure processing.

Prevalence and predictors of atrial arrhythmias in patients with sinus node dysfunction and atrial pacing.

PURPOSE: This study aimed to determine the incidence, prevalence, and predictors of atrial arrhythmias (AAs) in patients with symptomatic sinus node dysfunction (SND) who required permanent pacemaker implantation. Also, we evaluated the impact of atrial pacing (AP) on AAs. METHODS: All consecutive patients who underwent pacemaker implantation from 2005 to 2011 were included. Atrial fibrillation (AF), atrial flutter (AFL), atrial tachycardia (AT), and AV nodal reentrant tachycardia (AVNRT) were detected via pacemaker interrogation and clinical documentation. RESULTS: The study group included 322 patients (44% male) with mean age 68.8 ± 15 years and followed for an average of 5.6 ± 2.2 years (median 5.7 years). Overall, 61.8% were found to have any AA at follow-up. Individual prevalence of AAs was high as follows: AF 43.5%, AFL 6.5%, AT 25%, and AVNRT 6.8%. AF was documented in 23% of patients (n = 74) prior to pacemaker; among those, 15% (n = 11) had no recurrence of AF with average AP of 74%. The incidence of new-onset AF after pacemaker was 15.8%. In subgroup analysis, prevalence of AF was increased by 16% with high rate of AP (81-100%) and 17% with lower rate of AP (0-20%). Incidence of new-onset AF was not affected by AP. Diabetes, hypertension, and left atrial enlargement were predictors of AAs. White men and women had higher prevalence of AF. CONCLUSIONS: AAs are highly prevalent in SND, particularly in white patients. Paroxysmal AF is suppressed with AP in minority, but there is no impact of AP on new-onset AF. Patients with diabetes, hypertension, and dilated atria must be monitored closely for early detection of AAs.

Considerations in the management of giant frontal mucoceles with significant intracranial extension: A systematic review.

BACKGROUND: Giant frontal mucoceles, characterized by significant intracranial and/or intraorbital extension, can present with significant neurologic symptoms. Although typical mucoceles are managed endoscopically, giant mucoceles are often treated with an open or combined approach due to various concerns, including frontal lobe displacement, size, and rapid decompression of the intracranial component. The impact of significant intracranial extension on outcomes is not well described. OBJECTIVE: This review studied key neurologic considerations in the management of giant frontal sinus mucoceles and analyzed outcomes of different management strategies. METHODS: Systematic literature review by following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement. RESULTS: Thirty-two articles, which represented 85 cases, met inclusion criteria. Neurologic symptoms on presentation ranged from headache (24.7%) and vision loss (12.9%) to extremity weakness (1.2%), frontal lobe syndrome (2.4%), and seizures (4.7%). Twenty-eight patients were treated endoscopically (34.1%), and 54 (65.9%) were treated with an external approach. Twenty-five of the open procedures included a craniotomy. Indications for the open approach included subdural empyema, enucleation, or large anterior table defects. Perioperative antibiotics were not consistently used. No perioperative seizures were reported with any approach. There were six cerebrospinal fluid leaks, all in the patients who underwent open procedures. The overall recurrence rate was 3.5%, with no recurrences reported in patients treated with an open approach. Follow-up ranged from 1 week to 8 years. CONCLUSIONS: Giant frontal mucoceles often present with various neurologic symptoms. Both open and endoscopic techniques offer excellent results. Endoscopic management is effective and preferred, except in special circumstances. An interdisciplinary team approach should be used to optimize surgical planning.

Teaching professionalism in graduate medical education: What is the role of simulation?

BACKGROUND: We systematically reviewed the literature concerning simulation-based teaching and assessment of the Accreditation Council for Graduate Medical Education professionalism competencies to elucidate best practices and facilitate further research. METHODS: A systematic review of English literature for "professionalism" and "simulation(s)" yielded 697 abstracts. Two independent raters chose abstracts that (1) focused on graduate medical education, (2) described the simulation method, and (3) used simulation to train or assess professionalism. Fifty abstracts met the criteria, and seven were excluded for lack of relevant information. The raters, 6 professionals with medical education, simulation, and clinical experience, discussed 5 of these articles as a group; they calibrated coding and applied further refinements, resulting in a final, iteratively developed evaluation form. The raters then divided into 2 teams to read and assess the remaining articles. Overall, 15 articles were eliminated, and 28 articles underwent final analysis. RESULTS: Papers addressed a heterogeneous range of professionalism content via multiple methods. Common specialties represented were surgery (46.4%), pediatrics (17.9%), and emergency medicine (14.3%). Sixteen articles (57%) referenced a professionalism framework; 14 (50%) incorporated an assessment tool; and 17 (60.7%) reported debriefing participants, though in limited detail. Twenty-three (82.1%) articles evaluated programs, mostly using subjective trainee reports. CONCLUSION: Despite early innovation, reporting of simulation-based professionalism training and assessment is nonstandardized in methods and terminology and lacks the details required for replication. We offer minimum standards for reporting of future professionalism-focused simulation training and assessment as well as a basic framework for better mapping proper simulation methods to the targeted domain of professionalism.

Acute obstructive suppurative pancreatic ductitis in an asymptomatic patient.

Acute obstructive suppurative pancreatic ductitis (AOSPD), defined as suppuration from the pancreatic duct without associated pseudocyst, abscess, or necrosis, is a rare complication of chronic pancreatitis. We present the first case of AOSPD in an asymptomatic patient with a polymicrobial infection and review the literature on this rare clinical entity.

Multidisciplinary approach to converting power chair into motorized prone cart.

Pressure ulcers remain a major source of morbidity and mortality in veterans with neurologic impairment. Management of pressure ulcers typically involves pressure relief over skin regions containing wounds, but this can lead to loss of mobility and independence when the wounds are located in regions that receive pressure from sitting. An innovative, low-cost, multidisciplinary effort was undertaken to maximize quality of life in a veteran with a thoracic-4 level complete spinal cord injury and a stage 4 ischial wound. The person's power wheelchair was converted into a motorized prone cart, allowing navigation of the Department of Veterans Affairs spinal cord injury hospital ward and improved socialization while relieving pressure on the wound. Physical and occupational therapy assisted with the reconfiguration of the power chair and verified safe transfers into the chair and driving of the device. Psychology verified positive psychosocial benefit, while nursing and physician services verified an absence of unwanted pain or skin injury resulting from use of the device. Further investigation of ways to apply this technique is warranted to improve the quality of life of persons with pressure ulcers.