Nitrogen mineralization from organic amendments is variable but predictable.

To manage nitrogen (N) efficiently, organic growers must be able to predict the amount and timing of plant-available N from organic amendments. In this study, we measured N mineralization from a variety of organic amendments, including composted animal manures and plant material, pelleted and granular organic fertilizer formulations, slaughter waste products, and hydrolyzed liquid fertilizers. In a laboratory incubation, we measured net N mineralization from materials mixed with either organically or conventionally managed soil at 23°C and 60% water holding capacity after 0, 7, 21, 42, and 84 d. We found that net mineral N change in the amended soils after 84 d of incubation fell into four categories: immobilization to 5% of applied N for yard trimmings composts, 15-30% for poultry manure composts, 35-55% for granular fertilizers, and 60-90% for quick release products. However, across all amendments the amount of plant-available N after 84 d of incubation was well correlated with the carbon (C)/N ratio (R2  = 0.92). Within amendment types, the C/N ratio predicted N mineralization for yard trimmings composts (R2  = 0.91), manure composts (R2  = 0.81), and specialty fertilizer and slaughter products (R2  = 0.88) but not liquid products (R2  = 0.11). Soil management history did not consistently affect net N mineralization but may have influenced timing.

Exploring Patients' Values and Preferences for Initial Atrial Fibrillation Education.

BACKGROUND: People with a new diagnosis of atrial fibrillation (AF) require knowledge to build skills and confidence to engage in decision making for AF treatment and prevention of AF-related complications. Data to guide development of content and approaches that enable acquisition of knowledge to support effective self-management are lacking. OBJECTIVE: The aim of this study was to explore patients' values concerning the content of initial AF education, describe how providers delivered education, and identify patients' preferences for approaches to education. METHODS: We used a qualitative inductive approach. Twenty-five participants given a diagnosis of AF within 18 months of enrollment were recruited from midwest US healthcare system clinics. Data were collected using a semistructured interview guide and were analyzed using qualitative content analysis. RESULTS: Themes emerging were as follows: (1) important to know, (2) recollections of the how and what of education, and (3) preferences for educational resources. Participants highly valued providers' explanations that AF was not immediately life-threatening and did not require limitations to usual activities. This reassurance from providers decreased fear and then enabled participants to learn about AF management. Verbal explanations were the primary approach to delivering education, but participants consistently expressed preferences for receiving written information and videos to supplement verbal explanations. CONCLUSIONS: Addressing emotional and quality of life concerns at the time of AF diagnosis reduced fear and was critical for enabling participants to attend to discussions about treatment and self-management. The value participants placed on written and video resources as an adjunct to verbal explanation suggests that providers should consider educational approaches beyond verbal explanations.

Atrial Fibrillation: Community Screening Events Improve Awareness in Older Adults.

Educating older adults during atrial fibrillation (AF) screening events to recognize signs and symptoms and seek evaluation may promote detection of AF that occurs between screenings. The authors evaluated learning outcomes of AF awareness education provided during AF screening using a single-arm, pre/posttest design. Participants completed the Knowledge, Attitudes, Beliefs about Atrial Fibrillation Self-Monitoring and Treatment-Seeking (KABAF-SMTS) survey, participated in AF awareness education, and completed a KABAF-SMTS survey 2 weeks after education. Paired t tests revealed that knowledge of AF symptoms increased (p = 0.007). Scores for recognizing the seriousness of AF (p = 0.003), benefits of self-monitoring (p < 0.001), perception of barriers to self-monitoring (p = 0.002), and confidence (p < 0.001) to recognize AF and seek treatment improved. AF awareness education strengthened knowledge, beliefs, and attitudes that may be conducive to recognition and treatment-seeking for AF. [Journal of Gerontological Nursing, 45(9), 31-38.].

Unpacking the parallel effects of parental alcohol misuse and low income on risk of supervisory neglect.

Although low income status and parent alcohol misuse are considered critical risk factors for child neglect, little is known about the mechanisms of this association. No known research has assessed the parallel effect of each on occurrence of child neglect. This study aimed to explore the direct and indirect effects of parent alcohol misuse and low family income on risk of supervisory neglect through mediating factors such as parent depressive symptoms and low social support. The study used a sample of 2990 parents of children under 13 years old who completed a listed telephone survey conducted in 50 mid-sized cities within California during 2009. We used a structural equation model to estimate the direct and indirect effects of parent alcohol misuse (defined as heavy drinking frequency) and low family income on supervisory neglect toward a focal child, as well as the indirect effect via parental depressive symptoms and low social support. Mediation analysis to capture direct, indirect, and total effects of these two independent variables was also conducted. Results revealed a significant direct effect of low family income on likelihood of supervisory neglect. Low income also exhibited an indirect effect via increased depressive symptoms and low social support. Annual frequency of heavy drinking showed no direct effect on supervisory neglect likelihood, but an indirect effect was observed via increased depressive symptoms and decreased social support. Parent low income and high frequency heavy drinking likely increase risks for supervisory neglect through distinct pathways. Longitudinal research is needed to confirm the pathways identified within this study.

Effect of a Parenting Intervention on Foster Care Reentry After Reunification Among Substance-Affected Families: A Quasi-Experimental Study.

Although parental substance abuse has been identified as a risk factor for poor foster care outcomes, current research on effective interventions is limited. A few studies have shown that parenting interventions improved parenting skills and family functioning and decreased time to reunification among children in foster care due to parental substance abuse. However, more research is needed to evaluate whether these interventions positively impact reentry rates. Using propensity score analyses to establish a matched comparison group, survival analyses evaluated the relationship between participation in a parenting intervention, the Strengthening Families Program (SFP), and reentry among a sample of 493 children previously reunified with their parents. The overall reentry rate was 20.9%. Analyses indicated that there was no difference in reentry rates between the SFP (23.7%) and comparison groups (18.6%). Significant predictors of reentry were child behavior problems, family poverty, and reunification between 15 and 18 months from removal.

A study in contrasts: Supports and barriers to successful implementation of two evidence-based parenting interventions in child welfare.

Although evidence-based interventions (EBIs) are spreading to child welfare, research on real-world dynamics of implementation within this setting is scarce. Using a six-factor implementation framework to examine implementation of two evidence-based parenting interventions, we sought to build greater understanding of key facilitators and barriers by comparing successful versus failed EBI implementation in a child welfare setting. Semi-structured interviews were conducted with a purposive sample of 15 frontline practitioners and state-level managers. Interviews were transcribed verbatim and data analysis used a modified analytic approach. Our results showed the successful EBI was viewed more positively on all six factors; however, implementation was multidimensional, multilevel, and mixed with accomplishments and challenges. An accumulation of strengths across implementation factors proved beneficial. Implementation frameworks may be advantageous in organizing and explaining the numerous factors that may influence successful versus failed implementation. While encountering obstacles is largely inevitable, understanding which factors have shaped the success or failure of EBI implementations in child welfare settings may optimize future implementations in this context.

Examining the role of methamphetamine in permanency: A competing risks analysis of reunification, guardianship, and adoption.

Parental methamphetamine use has drawn significant attention in recent years. Despite prior research that shows that parental substance abuse is a risk factor for lengthy foster care stay, little is known about the effect of specific types of substance use on permanency. This study sought to compare the impact of parental methamphetamine use to alcohol use, other drug use, and polysubstance use on the timing of 3 types of permanency: reunification, guardianship, and adoption. Using an entry cohort of 16,620 children who had entered foster care during a 5-year period, competing risks event history models were conducted for each permanency type. Findings showed that, after controlling for several case characteristics, parent illicit drug use significantly impacted the timing of the 3 types of permanency, but alcohol use did not. Methamphetamine, other drug, and polysubstance with methamphetamine use were associated with lower rates of reunification and higher rates of adoption. Guardianship was also predicted by other drug and polysubstance use without methamphetamine; however, methamphetamine use was not associated with guardianship. Notably, the methamphetamine groups comprised the youngest children and had the shortest median time to adoption. Results suggest that type of parental substance use is predictive of permanency exits and that parental illicit drug use may require tailored strategies for improving permanency outcomes. Further implications of the findings are discussed.

Co-Occurrence of Parental Substance Abuse and Child Serious Emotional Disturbance: Understanding Multiple Pathways to Improve Child and Family Outcomes.

This study is a mixed-methods examination of the prevalence and impact of parental substance abuse among families involved in foster care who have a child with a serious emotional disturbance. Data utilized for this study were both administrative and assessment data collected by case managers and parents as part of a federally funded demonstration project in a Midwestern state. At baseline, parent self-report and case manager ratings of family functioning found that parents affected by substance abuse fared worse in domains related to socioeconomics, parental trauma, parental mental health, and social supports when compared to families without parental substance abuse. Case managers and independent raters scored parents affected by substance abuse higher on effective parenting than parents not affected by substance abuse. While all children in the sample have a serious emotional disturbance, parents and case managers rated children's functioning higher among children whose families were characterized by parental substance abuse. These results suggest that, among families who have children with a serious emotional disturbance and are in foster care, those with and without substance abuse may represent two distinct service groups, each with a unique set of needs and contextual factors. For families with parental substance abuse, findings suggest that an appropriate child welfare response should attend to both children's and parent's behavioral health needs and include strategies that are well matched to the families' socioeconomic and social support needs.

Population-based incidence of diabetes in Australian youth aged 10-18 yr: increase in type 1 diabetes but not type 2 diabetes.

BACKGROUND: Global incidence of childhood type 2 diabetes has increased, with a greater rise amongst certain ethnic groups. OBJECTIVES: To examine the change in the incidence of type 1 and type 2 diabetes in Australian youth, aged 10-18 yr, in New South Wales, Australia. METHODS: Prospective population-based incidence study (2001-2008). Primary case ascertainment was from the Australasian Paediatric Endocrine Group Diabetes Register, secondary independent ascertainment from the National Diabetes Register. RESULTS: There were 202 incident cases of type 2 diabetes (96 boys, 48%). The mean age at diagnosis (±SD) was 14.6 ± 2.5 yr; 93% were overweight (International Obesity Taskforce Grade ≥1). Mean HbA1c was 8.8 ± 2.8%. Ethnicity was Caucasian 31%, Indigenous Australian 20%, Southeast Asian 11%, North African/Middle Eastern 9%, and NewZealander/Melanesian/Polynesian 8%. The mean annual incidence of type 2 diabetes was 3.0 per 100 000 per year (95% confidence interval (CI): 2.6-3.4) and did not change over time. The mean annual incidence of type 1 diabetes was 22.0 per 100 000 per year (95% CI: 20.8-23.1), and increased by 3.8% per year [incidence rate ratio IRR: 1.04, 95% CI: 1.02-1.06, p = 0.001]. Incidence was higher in Indigenous vs. non-Indigenous youth, IRR: 6.9 (95% CI: 4.7-10.2, p < 0.001). CONCLUSION: In 10-18 yr old youth, in Australia, the incidence of type 2 diabetes has remained steady during the last decade; however, the incidence of type 1 diabetes continues to rise. Most common diabetes in Australian youth is type 1 diabetes.

Tuning smart microgel swelling and responsive behavior through strong and weak polyelectrolyte pair assembly.

The layer-by-layer (LbL) assembly of polyelectrolyte pairs on temperature and pH-sensitive cross-linked poly(N-isopropylacrylamide)-co-(methacrylic acid), poly(NIPAAm-co-MAA), microgels enabled a fine-tuning of the gel swelling and responsive behavior according to the mobility of the assembled polyelectrolyte (PE) pair and the composition of the outermost layer. Microbeads with well-defined morphology were initially prepared by synthesis in supercritical carbon dioxide. Upon LbL assembly of polyelectrolytes, interactions between the multilayers and the soft porous microgel led to differences in swelling and thermoresponsive behavior. For the weak PE pairs, namely poly(L-lysine)/poly(L-glutamic acid) and poly(allylamine hydrochloride)/poly(acrylic acid), polycation-terminated microgels were less swollen and more thermoresponsive than native microgel, whereas polyanion-terminated microgels were more swollen and not significantly responsive to temperature, in a quasi-reversible process with consecutive PE assembly. For the strong PE pair, poly(diallyldimethylammonium chloride)/poly(sodium styrene sulfonate), the differences among polycation and polyanion-terminated microgels are not sustained after the first PE bilayer due to extensive ionic cross-linking between the polyelectrolytes. The tendencies across the explored systems became less noteworthy in solutions with larger ionic strength due to overall charge shielding of the polyelectrolytes and microgel. ATR FT-IR studies correlated the swelling and responsive behavior after LbL assembly on the microgels with the extent of H-bonding and alternating charge distribution within the gel. Thus, the proposed LbL strategy may be a simple and flexible way to engineer smart microgels in terms of size, surface chemistry, overall charge and permeability.

Does the inclusion of 'professional development' teaching improve medical students' communication skills?

BACKGROUND: This study investigated whether the introduction of professional development teaching in the first two years of a medical course improved students' observed communication skills with simulated patients. Students' observed communication skills were related to patient-centred attitudes, confidence in communicating with patients and performance in later clinical examinations. METHODS: Eighty-two medical students from two consecutive cohorts at a UK medical school completed two videoed consultations with a simulated patient: one at the beginning of year 1 and one at the end of year 2. Group 1 (n = 35) received a traditional pre-clinical curriculum. Group 2 (n = 47) received a curriculum that included communication skills training integrated into a 'professional development' vertical module. Videoed consultations were rated using the Evans Interview Rating Scale by communication skills tutors. A subset of 27% were double-coded. Inter-rater reliability is reported. RESULTS: Students who had received the professional development teaching achieved higher ratings for use of silence, not interrupting the patient, and keeping the discussion relevant compared to students receiving the traditional curriculum. Patient-centred attitudes were not related to observed communication. Students who were less nervous and felt they knew how to listen were rated as better communicators. Students receiving the traditional curriculum and who had been rated as better communicators when they entered medical school performed less well in the final year clinical examination. CONCLUSIONS: Students receiving the professional development training showed significant improvements in certain communication skills, but students in both cohorts improved over time. The lack of a relationship between observed communication skills and patient-centred attitudes may be a reflection of students' inexperience in working with patients, resulting in 'patient-centredness' being an abstract concept. Students in the early years of their medical course may benefit from further opportunities to practise basic communication skills on a one-to-one basis with patients.

Vitamin D deficiency is associated with retinopathy in children and adolescents with type 1 diabetes.

OBJECTIVE: To examine the hypothesis that vitamin D deficiency (VDD) is associated with an increased prevalence of microvascular complications in young people with type 1 diabetes. RESEARCH DESIGN AND METHODS: In a cross-sectional study of 517 patients, 25-hydroxyvitamin D was measured. Retinopathy was assessed by 7-field stereoscopic retinal photography, peripheral neuropathy by thermal and vibration threshold testing, and microalbuminuria by albumin excretion rate or albumin-to-creatinine ratio. RESULTS: Retinopathy prevalence was higher in cases with VDD versus sufficiency (18 vs. 9%, P = 0.02); deficiency was not associated with microalbuminuria or neuropathy. In logistic regression, retinopathy was associated with VDD (odds ratio 2.12 [95% CI 1.03-4.33]), diabetes duration (1.13, 1.05-1.23), and HbA(1c) (1.24, 1.02-1.50). CONCLUSIONS: VDD is associated with an increased prevalence of retinopathy in young people with type 1 diabetes. The inflammatory and angiogenic effects of VDD may contribute to early retinal vascular damage; however, further investigations are warranted.

Medical therapy for rheumatic heart disease: is it time to be proactive rather than reactive?

Rheumatic Heart Disease (RHD) is well known to be an active inflammatory process which develops progressive calcification and leaflet thickening over time. The potential for statin therapy in slowing the progression of valvular heart disease is still controversial. Retrospective studies have shown that medical therapy is beneficial for patients with calcific aortic stenosis and recently for rheumatic valve disease. However, the prospective randomized clinical trials have been negative to date. This article discusses the epidemiologic risk factors, basic science, retrospective and prospective studies in valvular heart disease and a future clinical trial to target RHD with statin therapy to slow the progression of this disease. Recent epidemiological studies have revealed the risk factors associated with valvular disease include male gender, smoking, hypertension and elevated serum cholesterol and are similar to the risk factors for vascular atherosclerosis. An increasing number of models of experimental hypercholesterolemia demonstrate features of atherosclerosis in the aortic valve (AV), which are similar to the early stages of vascular atherosclerotic lesions. Calcification, the end stage process of the disease, must be understood as a prognostic indicator in the modification of this cellular process before it is too late. This is important in calcific aortic stenosis as well as in rheumatic valve disease. There are a growing number of studies that describe similar pathophysiologic molecular markers in the development of rheumatic valve disease as in calcific aortic stenosis. In summary, these findings suggest that medical therapies may have a potential role in patients in the early stages of this disease process to slow the progression of RHD affecting the valves. This review will summarize the potential for statin therapy for this patient population.

Lytic granule loading of CD8+ T cells is required for HIV-infected cell elimination associated with immune control.

Virus-specific CD8+ T cells probably mediate control over HIV replication in rare individuals, termed long-term nonprogressors (LTNPs) or elite controllers. Despite extensive investigation, the mechanisms responsible for this control remain incompletely understood. We observed that HIV-specific CD8+ T cells of LTNPs persisted at higher frequencies than those of treated progressors with equally low amounts of HIV. Measured on a per-cell basis, HIV-specific CD8+ T cells of LTNPs efficiently eliminated primary autologous HIV-infected CD4+ T cells. This function required lytic granule loading of effectors and delivery of granzyme B to target cells. Defective cytotoxicity of progressor effectors could be restored after treatment with phorbol ester and calcium ionophore. These results establish an effector function and mechanism that clearly segregate with immunologic control of HIV. They also demonstrate that lytic granule contents of memory cells are a critical determinant of cytotoxicity that must be induced for maximal per-cell killing capacity.

Innate immunity in HIV infection: enhanced susceptibility to CD95-mediated natural killer cell death and turnover induced by HIV viremia.

In the present study, we performed DNA microarray analyses and phenotypic and functional analyses in an effort to elucidate the mechanisms by which ongoing HIV replication affects the physiologic function of natural killer (NK) cells. Functional assays confirmed an increased propensity of NK cells from HIV-infected viremic individuals to undergo Fas-mediated apoptosis but not CD16- or NKG2D-mediated apoptosis. Serum levels of sFasL and expression of Ki67 on NK cells were markedly elevated in HIV-infected viremic individuals when compared with those of HIV-infected aviremic and HIV-seronegative individuals. Our data demonstrate that ongoing HIV replication results in profound NK-cell abnormalities that are likely to be attributable to the effects of virus-induced immune activation. Of note is an increased susceptibility to cell death mediated by CD95-sFasL interactions. In addition, these NK cells, particularly the CD56(dim) CD16(bright) subset, undergo enhanced cell turnover in vivo, as demonstrated by intracellular Ki67 expression.

Type 2 diabetes in Indigenous and non-Indigenous children and adolescents in New South Wales.

OBJECTIVE: To determine the incidence of type 2 diabetes mellitus (T2DM) in 2001-2006 in young people < 19 years and the characteristics of T2DM in the Indigenous group. DESIGN AND SETTING: Prospective population-based incidence study, New South Wales. PARTICIPANTS: Primary ascertainment was from the Australasian Paediatric Endocrine Group NSW Diabetes Register, with secondary ascertainment from the National Diabetes Register (Australian Institute of Health and Welfare). MAIN OUTCOME MEASURES: Incidence of T2DM in young people in NSW; incidence of T1DM and T2DM in Indigenous young people; characteristics at diagnosis. RESULTS: There were 128 incident cases of T2DM (62 boys, 66 girls) in the study period. The median age at diagnosis was 14.5 years (interquartile range, 13.0-16.4), and 90% were overweight or obese (body mass index > 85th percentile for age). Mean annual incidence was 2.5/100,000 person-years (95% CI, 2.1-3.0) in 10-18-year-olds. Of the ethnic groups represented, white Australian comprised 29%, Indigenous 22%, Asian 22%, North African/Middle Eastern 12% and Maori/Polynesian/Melanesian 10%. The incidence of T2DM was significantly higher in the Indigenous than the non-Indigenous group (incidence rate ratio, 6.1; 95% CI, 3.9-9.7; P<0.001), but incidence rates of T1DM were similar (15.5 v 21.4/100,000, respectively). CONCLUSIONS: T2DM accounts for 11% of incident cases of diabetes in 10-18-year-olds, and the majority are overweight or obese. The high rate among Indigenous Australian children supports screening for T2DM in this population.

The effect of professional skills training on patient-centredness and confidence in communicating with patients.

OBJECTIVES: The effect of introducing professional skills training on students' patient-centred attitudes and perceptions of ability to communicate was examined. The professional skills training included weekly training in communication skills, ethics and law, and clinical skills. METHODS: Consecutive cohorts of medical students receiving a traditional pre-clinical curriculum (n = 199) and a new curriculum including professional skills training (n = 255) were compared. Students completed the Doctor-Patient Scale to assess patient-centred attitudes and an 11-item scale to assess confidence in their ability to communicate with patients. Students completed the measures at the start of Year 1 and the end of Year 2. RESULTS: Students receiving the professional skills training showed increased confidence in communicating with patients and increases in 2 dimensions of patient-centredness ('holistic care' and 'patient decision making'). Students receiving the traditional curriculum showed increased nervousness in talking to patients. Gender and ethnic differences were found in patient-centredness and confidence in communicating, which were maintained over time. CONCLUSIONS: The introduction of professional skills training was successful in improving students' confidence in their ability to perform specific communicative behaviours and increasing patient-centredness relative to a traditional curriculum.

The rising incidence of childhood type 1 diabetes in New South Wales, 1990-2002.

OBJECTIVES: To determine the incidence of childhood type 1 diabetes mellitus (T1DM) in New South Wales from 1997 to 2002; to compare with previously published rates (1990-1996); and to analyse trends in incidence from 1990 to 2002. DESIGN, SETTING AND PARTICIPANTS: Prospective population-based incidence study. Primary ascertainment of incident cases aged < 15 years was from the Australasian Paediatric Endocrine Group NSW children's diabetes register. Secondary ascertainment was from the National Diabetes Supply Scheme until 1999 and from the Australian Institute of Health and Welfare thereafter. Childhood population data were obtained from the Australian Bureau of Statistics. MAIN OUTCOME MEASURES: Age-standardised incidence; trends in incidence by calendar year, and sex and age at diagnosis. RESULTS: There were 3260 incident cases (1629 boys, 1631 girls) in the 13 years. Case ascertainment was 99.7% complete using the capture-recapture method. Mean age-standardised incidence per 100 000 person-years was 20.9 (95% CI, 19.9 to 21.9) from 1997 to 2002 compared with 17.8 (95% CI, 17.0 to 18.7) from 1990 to 1996; there was a plateau in incidence between 1997 and 2002. Overall, the incidence increased on average by 2.8% per year (95% CI, 1.9% to 3.8%, P < 0.001) and increased with age, being 12.2 (95% CI, 11.3 to 13.1) in 0-4 year olds; 18.9 (95% CI, 17.8 to 20.0) in 5-9 year olds and 26.7 (95% CI, 25.4 to 28.1) in 10-14 year olds. The increase per year in 0-4 year olds (3.9%) was not significantly higher than in older children. The mean incidence of T1DM was 19.8 (95% CI, 18.8 to 20.7) in girls and 18.8 (95% CI, 17.9 to 19.7) in boys (P = 0.02). CONCLUSIONS: The incidence of childhood-onset T1DM has increased significantly in all age groups in NSW since 1990. Resource planning in the management of childhood diabetes in NSW should take these findings into account.

Sudden death after radiofrequency ablation of the atrioventricular node in patients with atrial fibrillation.

OBJECTIVES: We evaluated the incidence and predictors of sudden death after atrioventricular (AV) node ablation and pacemaker implantation. BACKGROUND: Sudden death may occur after radiofrequency catheter ablation of the AV node and pacemaker implantation in patients with atrial fibrillation (AF). Whether it is related to the procedure or to pre-existing heart disease remains unclear. METHODS: All patients who had radiofrequency catheter ablation of the AV node and pacemaker implantation for rate control of medically refractory AF were identified retrospectively and observed prospectively. All patients with sudden death after ablation were identified. The relationship between the procedure and sudden death was defined on the basis of the time between the two as "likely," "possibly" or "unlikely." RESULTS: Of 334 consecutive patients with AF who underwent AV node ablation, nine had sudden death after the ablation. Four patients (1.2%) had sudden death likely related to the procedure: in 3 patients, arrest occurred within 48 h after the procedure; in one patient, arrest occurred four days after the procedure. In three other patients (0.9%), sudden death was possibly related to the procedure because the event occurred within three months afterward. The remaining two deaths were unrelated to the procedure. Diabetes, New York Heart Association functional class (>or=II), preprocedure ventricular arrhythmia, mitral or aortic stenosis, aortic regurgitation and chronic obstructive pulmonary disease were independent predictors for sudden death. CONCLUSIONS: Sudden death likely or possibly related to catheter ablation occurred in 7 of 334 patients (2.1%). Risk of sudden death is highest within two days after the procedure.