Design and evaluation of a digital health intervention with proactive follow-up by nurses to improve healthcare and outcomes for patients with breast cancer in Mexico: protocol for a randomised clinical trial

Introduction
Nearly 30 000 Mexican women develop breast cancer annually, frequently presenting unmet supportive care needs. In high-income countries, incorporating electronic patient-reported outcomes (ePROs) into cancer care has demonstrated potential for increasing patient-centred care and reducing unmet needs. No such ePRO interventions have been implemented in Mexico. This paper presents the study protocol for designing and evaluating an ePRO digital health application combined with proactive follow-up by nurses.

Methods and analysis
We designed a two-component intervention for women receiving breast cancer treatment: a responsive web application for monitoring ePROs and clinical algorithms guiding proactive follow-up by nurses. We will conduct a pilot test of the intervention with 50 patients with breast cancer for 6 weeks to assess feasibility and adjust the application. We will conduct a parallel arm randomised controlled trial assigning 205 patients each to intervention and control in one of Mexico’s largest public oncology hospitals. The intervention will be provided for 6 months, with additional 3 months of post-intervention observation. The control group will receive usual healthcare and a list of breast cancer information sources. Women diagnosed with stages I, II or III breast cancer who initiate chemotherapy and/or radiotherapy will be invited to participate. The primary study outcome will be supportive care needs; secondary outcomes include global quality of life and breast symptoms. Information on the outcomes will be obtained through web-based self-administered questionnaires collected at baseline, 1, 3, 6 and 9 months.

Ethics and dissemination
The National Research and Ethics Committees of the Mexican Institute of Social Security approved the study (R-2021-785-059). Participants will sign an informed consent form prior to their inclusion. Findings will be disseminated through a policy brief to the local authorities, a webinar for patients, publications in peer-reviewed journals and presentations at national and international conferences.

Trial registration number
NCT05925257.

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Novembre 2023

Abstract 17627: The Relationship Between Physical Activity, Extracellular Vesicles, and Diabetes Risk in African American Women at Risk for Cardiovascular Disease: Data From a Pilot Study of the Step It Up Physical Activity Intervention

Circulation, Volume 148, Issue Suppl_1, Page A17627-A17627, November 6, 2023. Background:Diabetes and cardiovascular disease (CVD) disproportionally affect African American (AA) women. Prior studies suggest extracellular vesicles (EV) are involved in atherogenesis, but little is known about relationships between PA and EVs in AA women. Thus, we examined associations between diabetes risk markers, EV, and PA in a community-based cohort of AA women at risk for CVD from resource-limited Washington, D.C. neighborhoods.Methods:Participants were enrolled in pilot testing of Step It Up, a place-tailored mobile app designed to increase PA. Baseline daily step counts for PA were measured by Fitbit® (Charge 2) and fasting baseline blood samples were cryopreserved. NMR (Nuclear magnetic resonance) spectroscopy was used to measure Lipoprotein Insulin Resistance Index (LP-IR), a diabetes risk marker. EV were isolated from heparinized plasma using size exclusion chromatography with size and numbers determined by nanoparticle tracking analysis. Associations between LP-IR, EVs, and daily step count were analyzed using multivariable regressions adjusted for BMI and ASCVD 10-year risk score.Results:The study cohort was a convenience sample of AA women with overweight/obesity (N=24, Age: 57±12, BMI: 35±6, ASCVD: 9±5). Smaller EV size associated with higher LP-IR (β=-0.45, p=0.04) with EV concentration trending to a positive association with LP-IR (β=0.38, p=0.08). Higher daily step count associated with larger EV particle size (β=0.48, p=0.02) but not with EV concentration. Additionally, higher daily step count associated with lower LP-IR (β=-0.42, p=0.04).Conclusions:Our data show that reduced EV size and increased EV concentration associate with higher LP-IR, a diabetes index among a community-based cohort of AA women. Additionally, our findings suggest that PA might help mitigate these associations. More research is needed to understand the potential impact of PA on EV, diabetes risk and subsequent CVD. Future PA interventions in at-risk patients may reduce existing diabetes and CVD-related health disparities and EVs may emerge as a mechanistic link.

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Novembre 2023

Abstract 13999: The Relationship Between Neighborhood Deprivation, Diabetes, and Extracellular Vesicles in African American Women at Risk for CVD: Data From a Pilot Study of the Step It Up Physical Activity Intervention

Circulation, Volume 148, Issue Suppl_1, Page A13999-A13999, November 6, 2023. Background:African American women (AA) are at disproportionally high risk for diabetes and cardiovascular disease (CVD) which is accelerated when residing in resource-limited neighborhoods. Extracellular vesicles (EV) are emerging to be of importance in CVD development and progression, but little is known about a potential impact of neighborhood socioeconomic deprivation (NSD). In this study we examined associations between NSD, plasma EV, and markers of diabetes risk in a community-based cohort of AA women at risk for CVD from resource-limited neighborhoods in Washington, DC.Methods:Participants were enrolled in pilot testing of Step It Up, a community engaged physical activity intervention. Blood samples were drawn to measure clinical labs during participants’ baseline visit to the NIH Clinical Center. EV were isolated from heparinized plasma using size exclusion chromatography with size and numbers determined by nanoparticle tracking analysis. NSD was calculated using 2018 US Census tract data as a measure of neighborhood deprivation. Associations between NSD, EV, and diabetes-related clinical measures were analyzed using multivariable regressions adjusted for BMI and ASCVD 10-year risk score.Results:The study cohort was a convenience sample of AA women at risk for CVD (N=24, Age: 57±12, BMI: 35±6, ASCVD: 9±5). NSD associated with fasting glucose (β=0.54, p=0.007) and Hemoglobin A1c (HA1c) (β=0.51, p=0.007). Additionally, NSD associated with lower EV size (β=-0.42, p=0.03), with no association with EV concentration. Fasting glucose and HA1c associated negatively with EV size (β=-0.48, p=0.03 and β=-0.50, p=0.02, respectively) but no association was found with EV concentration.Conclusions:Thus, our data show that higher neighborhood deprivation is associated with lower EV size which, in turn, is associated with higher diabetes risk markers. More research is needed to understand the role of EV in diabetes and CVD development and progression. While larger studies further evaluating these observations are needed, our data highlight the importance of increased diabetes screening and multi-level interventions in patients residing in under-resourced communities to reduce existing health disparities.

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Novembre 2023

Abstract 18106: Keeping up With the Newest Guideline Directed Medical Therapy for Heart Failure With Reduced Ejection Fraction, Resident-Driven Quality Improvement Project

Circulation, Volume 148, Issue Suppl_1, Page A18106-A18106, November 6, 2023. Introduction:Chronic Heart Failure (CHF) is an epidemic associated with high morbidity and mortality. As per 2022 AHA/ACC/HFSA guidelines, the management of Heart Failure with reduced Ejection Fraction (HFrEF) includes Angiotensin Receptor-Neprilysin Inhibitors (ARNIs), Angiotensin-Converting Enzyme Inhibitors (ACEIs)/Angiotensin Receptor Blockers (ARBs), Beta-Blockers (BB), Mineralocorticoid Receptor Antagonists (MRA) and Sodium-Glucose co-transporter 2 Inhibitors (SGLT2I) as class 1 recommendations. Considering the new guidelines for HFrEF we decided to perform a quality improvement project to improve the GDMT prescription rate in patients with HFrEF.Methods:Our project included: dot phrase creation for all physicians through electronic medical records (EMR) system, educational sessions, monthly emails and weekly EMR chat messages regarding GDMT and CHF order set to physicians, A4 sized posters distributed on all hospital floors. We then performed retrospective review and analysis of patient charts who were admitted to three UPMC Central PA hospitals with diagnosis of HFrEF exacerbation during December 2019 to January 2021 (pre-intervention) and March 2022 to September 2022 (post-intervention).Results:Total 615 patients were included. There were no significant differences in demographics between pre intervention (357) and post intervention (258) groups including age, sex, race. There were no differences in prescription rate and target dose at discharge between BB groups (92.72% vs 91.86%%, p=0.693 and 7.25% vs 7.17%, p=0.978). The intervention helped in increasing prescription of ARNIs from 6.2% to 30.62%, p< 0.0001 and 13.92% were discharged on target dosages. The prescription of MRA was increased (47.62%vs 51.55%). Furthermore, initiation of SGLT2I was achieved in 41.47% in post-intervention from 0% in the pre-intervention group.Conclusions:Despite higher awareness of GDMT and the trend towards having more patients discharged on therapeutic dosages of GDMT, it is evident that GDMT is still underused among patients with HFrEF. Our results indicate that more emphasis should be placed on rapid up-titration of GDMT.

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Novembre 2023

Abstract 15982: Management and Follow-Up of Inpatients With Cardiac Implantable Electronic Devices and Bacteremia With and Without Electrophysiology Consultation

Circulation, Volume 148, Issue Suppl_1, Page A15982-A15982, November 6, 2023. Introduction:Transvenous cardiac implantable electronic device (CIED) infection is a significant cause of morbidity and mortality. Expert consensus recommends a multidisciplinary approach to bacteremia in the context of CIED incorporating both infectious disease (ID) and electrophysiology (EP) consultation to balance the risks of infection with those of CIED removal.Hypothesis:Not all patients with CIEDs and bacteremia are evaluated with EP consultation, and this difference is associated with variability in management.Methods:Using the EMR, we retrospectively identified inpatients with a CIED and a positive blood culture across three hospitals: one academic, one specialty and one community. True infection versus contaminant was determined by an EP or ID attending at the time of presentation or adjudicated retrospectively by an EP who performs extractions. We examined the rates of EP consultation based on hospital site, CIED removal and appropriate follow-up in those without CIED removal. Fisher’s exact test was used to compare the rates of follow up.Results:We identified 88 inpatients with a CIED and positive blood culture between January 2020 – February 2023. True bacteremia was adjudicated in 48 patients (55%). Of these patients, 24 were seen by EP (50%), 22 were seen by EP and ID (46%), and 14 were seen by neither (29%). Patients admitted to an academic hospital were more likely to be seen by EP (22/38, 57%) than those admitted to a specialty or community hospital (2/10, 20%). CIED removal was performed in 15 of 24 patients seen by EP (63%). Patients seen by EP were significantly more likely to have documented plans, repeat blood cultures after antibiotic completion, and appropriate follow up than those not seen by EP (24/24 100% vs. 3/24, 8%, p

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Novembre 2023

Abstract 13992: A Dacron Limited Transannular Patch Prevents Progressive Pulmonary Valve Annulus Dilation: Results of Serial Early, Intermediate, and Long-Term Follow-Up

Circulation, Volume 148, Issue Suppl_1, Page A13992-A13992, November 6, 2023. Objective:The repair of tetralogy of Fallot (ToF) using a transannular patch can result in progressive pulmonary valve annulus (PVA) dilation, preventing the option of a future catheter-based pulmonary valve replacement and requiring early reoperation. A rigid Dacron limited transannular patch (LTAP) that nominally expands the PVA may prevent long-term annular dilation and reoperation.Hypothesis:Infants following a LTAP would have similar rates of PVA growth compared to infants requiring only a subvalvar (SV) repair.Methods:Infants < 1 year between 1998-2018 requiring a SV or LTAP ToF repair were divided into two groups based on the surgical approach. Pre-operative and serial follow-up echocardiograms quantified the PVA diameter and corresponding Z-Score at 5, 10, and 15 years. Multivariate analysis examined the risk factors for reoperation.Results:From 232 ToF repairs (LTAP-94; SV-138), the LTAP group was significantly younger (103±53 vs. 138±67 days; p

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Novembre 2023

Abstract 15170: Prognostic Implication of Left Atrial Reservoir Strain in Severe Mitral Stenosis With Low Transmitral Diastolic Pressure Gradient: Result From Long-Term Follow-Up Registry

Circulation, Volume 148, Issue Suppl_1, Page A15170-A15170, November 6, 2023. Background:Prognosis of severe mitral stenosis (MS) with low transmitral mean diastolic pressure gradient (MDPG) has not been fully understood with lack of long-term follow-up study.Aims:We investigated the prognostic implication in severe MS with low MDPG.Methods:We included patients with severe rheumatic MS (mitral valve area [MVA] < 1.5 cm2) from the Multicenter mitrAl STEnosis with Rheumatic etiology (MASTER) registry. Patients with severe MS were categorized into high (≥ 5 mmHg) or low (< 5 mmHg) MDPG groups. The primary outcome was a composite of all-cause mortality and stroke. Among 1,248 patients with severe MS, 322 (25.8%) had low and 926 (74.2%) had high MDPG.Results:Their mean age was 59±13 years, 25% were men, and 74% had atrial fibrillation. Patients with low MDPG were older and had a higher prevalence of atrial fibrillation. During a mean follow-up of 6.8±5.9 years, 194 patients (15.5%) experienced composite events. Patients with severe MS and low MDPG had a higher risk of experiencing composite events compared to those with high MDPG (hazard ratio [HR]: 1.56, 95% CI: 1.15-2.12; p=0.004). Subgroup analysis with low MDPG revealed that decreased left atrial reservoir strain (LARs) was independently associated with poorer outcome (HR, 2.58, 95% CI: 1.08-6.20; p=0.034).Conclusion:Severe MS patients with low MDPG are at higher risk of adverse events compared to those with high MDPG. The assessment of LARs can be useful in identifying subgroups of low MDPG severe MS patients with poor prognosis.

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Novembre 2023

Abstract 18248: Physical Activity and Nutrition Self-Efficacy Associates With Perceived Everyday Discrimination in African American Women: The Step It Up Physical Activity Intervention

Circulation, Volume 148, Issue Suppl_1, Page A18248-A18248, November 6, 2023. Background:Increased self-efficacy facilitates health promoting behaviors such as physical activity (PA). Perceived discrimination may limit PA among minoritized populations, but little is known about the relationship between PA and nutrition self-efficacy (PANSE) and perceived discrimination (PD) among African American (AA) women with overweight/obesity.Methods:We examined the associations between PANSE and PD in 106 AA women in the Step It Up, a community-engaged, digital health intervention. All completed the PANSE (higher scores = higher self-efficacy), the everyday discrimination scale (higher scores = higher frequency of everyday discrimination), and a sociodemographic survey. We used linear regression to assess the associations between PANSE and PD adjusting for covariates and the interaction effects of discrimination and income.Results:The participants had a mean age of 55.9 (SD±12.7) years with mean BMI 36.3 (SD±6.9) kg/m2. PD was negative and significantly associated with PANSE in both our unadjusted model and after adjusting for age and educational level (Table 1). The association trended marginally significant in the third model when we adjusted for income. We found no interaction effect between PD and income.Conclusion:PD is associated with PANSE among this AA women cohort. This suggests an urgent need for future research to better extricate the relationship between PD and PANSE to inform interventions that addresses everyday discrimination among diverse population groups; particularly in AA women with overweight/obesity.

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Novembre 2023

Abstract 15640: Long Term Event-Free Survival in Patients With Ischemic and Non-Ischemic Cardiomyopathy up to Thirteen Years Following Cell-Based Therapy: Results From the Hyperion Observational Cohort

Circulation, Volume 148, Issue Suppl_1, Page A15640-A15640, November 6, 2023. Introduction:The long-term clinical outcomes of cell-based therapies to treat ischemic (ICM) and non-ischemic dilated cardiomyopathy (NIDCM) are unknown. We therefore prospectively followed patients (pts) with ICM/NICDM treated by targeted transcatheter endocardial mesenchymal stromal cell (MSC) injections (TESI).Methods:Of the 155 pts enrolled in prior MSC TESI studies, 111 were eligible to be contacted. Of these, 47 (42%) agreed to participate and have periodic follow-up assessments (Cardiac MRI/CT, 6MWT, labs, PE, EKG, and MLHFq) for up to 13 years following their index procedure. Time-to-event information was captured from all 155 former participants. Endpoints included event-free survival, changes in left ventricular ejection fraction (EF), and ventricular remodeling. Clinical endpoint events were defined as the composite of: Death (all-cause mortality), Left Ventricular Assist Device (LVAD) placement, or Heart Transplant. Descriptive statistics were used to classify the sample, and Kaplan-Meier survival analysis was generated to examine time-to-event trends.Results:There were 134 men and 21 women, mean age 60.0±11.0 years, including 121 (78%) with ICM, and 34 (22%) with NIDCM. In pts with ICM, mean EF at baseline was 31 %±10.8% and after 1 year was 32.6%±11.8% (P=0.08). In pts with NIDCM baseline EF was 27%±10% and increased to 34%±13% after 1 year (P=0.002). Overall, 40% of pts had a decrease in LVEF, 26% had

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Novembre 2023

Abstract 13086: National Trends in Timely Ambulatory Follow-Up After Acute Myocardial Infarction and Congestive Heart Failure Cospitalizations Among Medicare Beneficiaries

Circulation, Volume 148, Issue Suppl_1, Page A13086-A13086, November 6, 2023. Introduction:Following hospitalization for acute myocardial infarction (AMI) or congestive heart failure (CHF), close outpatient follow-up is warranted for symptom monitoring and initiation or titration of evidence-based therapies.Objective:To describe temporal trends in ambulatory care following CHF and AMI hospitalizations, between 2010 and 2019.Methods:We examined a 100% sample of Medicare fee-for-service beneficiaries discharged to the community after an AMI or CHF hospitalization. We assessed quarterly rates of timely post-discharge cardiology and primary care follow-up, defined as receipt of an ambulatory visit within 14 days of discharge. We assessed trends for five subgroups based upon known disparities in cardiovascular outcomes: sex, race/ethnicity, Medicaid dual-eligibility, county-level social deprivation index, and rurality.Results:The AMI cohort included 1,680,916 hospitalizations (54.9% male, 9.4% Black, 81.7% White) and the CHF cohort included 4,256,405 hospitalizations (47.7% male, 16.2% Black, 75.0% White). Timely cardiology follow-up after AMI increased from 26.8% in 2010 to 39.4% in 2019 (absolute change 12.6%) while follow-up after CHF increased from 22.0% to 33.4% (absolute change 11.5%). The proportion of patients without cardiology or primary care follow-up after AMI decreased to 36.1% in 2019 and to 41.6% for CHF. Though rates of timely follow-up increased for all demographic groups, female, Black, Hispanic, Medicaid dual-eligible patients, patients residing in rural areas, and patients residing in counties with high social deprivation were less likely to receive follow-up throughout the study.Conclusions:Rates of timely ambulatory care after AMI and CHF hospitalization have improved, but the majority of patients do not receive follow-up within 14 days of discharge. Efforts to improve post-hospital cardiology and primary care follow-up have the potential to improve clinical outcomes and reduce disparities.

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Novembre 2023

Abstract 16260: Children With Increased Native T1, Extracellular Volume and T2 Values on Initial Cardiac Magnetic Resonance Imaging for Acute Myocarditis Have Less Improvement in Late Gadolinium Enhancement on Follow Up Imaging: Risk Factor for Adverse Events?

Circulation, Volume 148, Issue Suppl_1, Page A16260-A16260, November 6, 2023. Introduction:Late gadolinium enhancement (LGE) in pediatric patients with acute myocarditis has been shown to be a risk factor for adverse events. On follow up cardiac magnetic resonance imaging (CMR), some patients show improvement and/or resolution of LGE but others do not. Factors associated with residual LGE have not been described.Hypothesis:Measurements on initial CMR would be associated with degree of improvement of LGE on follow up CMR.Methods:We conducted a retrospective cohort study of patients

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Novembre 2023

Abstract 18219: J-Shaped Association Between LDL-Cholesterol Level and Cardiovascular Events: A Longitudinal Follow-Up Study Over 2.4 Million Nationwide Primary Prevention Cohort

Circulation, Volume 148, Issue Suppl_1, Page A18219-A18219, November 6, 2023. Introduction:Low-density lipoprotein (LDL)-cholesterol lowering treatment showed benefits in patients with high atherosclerotic cardiovascular disease (ASCVD) risk.Hypothesis:Although high LDL-cholesterol level is known to increase ASCVD risks, prognostic implications of low LDL-cholesterol level remain elusive.Methods:Using the data from a Korean Nationwide Cohort, we included 2,432,471 subjects without previous ASCVD. From 2009, subjects were followed for myocardial infarction (MI) and ischemic stroke until 2018. Subjects were stratified according to 10-year ASCVD risks (

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Novembre 2023

Abstract 16455: A Costly Mix-Up: Genotype-Phenotype Mismatch of Hereditary Transthyretin Cardiac Amyloidosis

Circulation, Volume 148, Issue Suppl_1, Page A16455-A16455, November 6, 2023. Introduction:Transthyretin cardiac amyloidosis (ATTR-CM) is an infiltrative process caused by the extracellular deposition of misfolded amyloid fibrils, resulting in a restrictive cardiomyopathy. Over 100 pathogenic genetic variants are associated with hereditary transthyretin cardiac amyloidosis (hATTR-CM); however, genetic penetrance is unknown. Typical echocardiographic findings include unexplained left ventricular (LV) hypertrophy – specifically concentric LV wall thickness greater than 12mm – and relative apical sparing of longitudinal LV strain. Cardiac MRI shows a characteristic diffuse subendocardial or transmural myocardial delayed gadolinium enhancement (DGE) pattern. Lastly, technetium-99m pyrophosphate scintigraphy (PYP) scan, an emerging sensitive and specific imaging modality, reveals grade 2 or greater myocardial uptake.Methods:We present a case series of three young patients, two who presented with new-onset, non-ischemic systolic heart failure, and one who presented with LV hypertrophy – suggestive of cardiac amyloidosis. Genetic testing and cardiac imaging with echocardiography, cardiac MRI and/or PYP scan were performed.Results:Genetic testing for all patients revealed the autosomal dominant and variably penetrant Valine 122 Isoleucine mutation, commonly associated with hATTR-CM. However, imaging for these patients was not suggestive of ATTR-CM. Therefore, they most likely represent silent carriers with alternate etiologies of heart failure.Discussion:This case series exemplifies several instances of genotype-phenotype mismatch in hATTR-CM. With the increasing use of genetic testing and the variable penetrance of this common pathogenic variant, a thorough evaluation must be conducted to ensure true cardiac infiltration in order to avoid inappropriately initiating the costly transthyretin stabilizer, Tafamidis, or disregarding alternative – potentially reversible – etiologies of heart failure.

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Novembre 2023

Abstract 17716: Comprehensive Cardiac Rehabilitation Following Myocardial Infarction Improves Clinical Outcomes Regardless of Exercise Capacity in a Long-Term Follow-Up

Circulation, Volume 148, Issue Suppl_1, Page A17716-A17716, November 6, 2023. Background:Reduced exercise capacity is recognized as a prognostic indicator of adverse outcomes in patients with myocardial infarction (MI). However, there is limited research evaluating the effectiveness of comprehensive cardiac rehabilitation (CR) in this population. Here, we show for the first time that participation in CR can improve the prognosis of MI patients with reduced exercise capacity in a long-term study.Methods:This cohort study included 610 consecutive patients with MI who underwent percutaneous coronary intervention (PCI) between 2008 and 2015. Patients who received supervised CR were divided into two groups according to the duration of CR: the non-CR group (only hospitalization) and the CR group (continued to outpatient-CR). Within the CR group, patients were further divided into a reduced exercise capacity group (% predicted peak VO2

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Novembre 2023

Abstract 11697: Combined-Energy Pulmonary Vein Isolation and Posterior Wall Isolation for Persistent Atrial Fibrillation: Results of a 3-year Follow-Up

Circulation, Volume 148, Issue Suppl_1, Page A11697-A11697, November 6, 2023. Introduction:Pulmonary vein isolation (PVI) is the cornerstone of catheter ablation for paroxysmal atrial fibrillation (AF), but the optimal ablation strategy for persistent AF (PsAF) remains controversial.Hypothesis:The purpose of this study was to investigate whether combined-energy cryoballoon (CB) PVI and radiofrequency (RF) left atrial posterior wall isolation (LAPWI) at index ablation of PsAF yields higher success than PVI alone.Methods:Patients with persistent AF (n = 186) who underwent catheter ablation between 2016 and 2019 at a single large academic medical center were retrospectively reviewed. Patients with congenital heart disease or prior left atrial ablation or surgery were excluded. Combined-energy ablation (n=92) consisted of CB antral PVI followed by RF roof and floor lines to achieve LAPWI, along with isolation inside the box as needed. The control group had PVI only (n=94) with either CB (n=57) or RF (n=37). The primary endpoint was 12-, 24-, and 36-month freedom from any documented atrial tachyarrhythmia over 30 seconds after a 90-day blanking period following catheter ablation, compared by Kaplan-Meier analysis. Secondary endpoints included AF burden, procedural parameters, and complications.Results:The primary endpoint of 12-month freedom from any atrial tachyarrhythmia was higher for the combined-energy group vs the control group (79.1% vs 58.2%, p = 0.009). This improvement was sustained at 24 months (63.0% vs 45.8%) and at 36 months (60.3% vs 43.1%) and remained significant after adjustment for clinical covariates (adjusted HR 0.45, 95% confidence interval 0.22-0.95; p = 0.03). There was no significant difference in procedure time or complication rates, however fluoroscopy time was shorter with combined-energy ablation (p

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Novembre 2023

Abstract 11627: Association of Cardiac Power Output Index With PET Glucose Metabolism and Prognosis in Pulmonary Arterial Hypertension Patients. Two-year Follow-Up

Circulation, Volume 148, Issue Suppl_1, Page A11627-A11627, November 6, 2023. Introduction:In pulmonary arterial hypertension (PAH) there is still a need for new prognostic markers to precisely identify the patients before clinical deterioration. We investigated cardiac power index (CPi) as a tool to assess right ventricular (RV) function and overall prognosis.Hypothesis:Hemodynamic changes occurring in PAH assessed with CPi are related with cardiac metabolism alterations in PET imaging what affects prognosis.Methods:Twenty-eight stable (WHO class II or III) patients (49.9±15.9 yo) had hybrid PET/MRI scans and heart catheterization performed during baseline and after 24-months. SUV RV/LV ratio was used to estimate cardiac 18-fluorodeoxyglucose uptake. Clinical endpoints (CEP – death or clinical deterioration) were assessed between visits. CPi was defined as the cardiac index х mean pulmonary artery pressure x 2.22 х 10-3.Results:Baseline CPi was 0.28±0.09 W/m2 and it correlated significantly with PET-derived SUV RV/LV ratio (r=0.55, p=0.002), confirming relationship between RV hemodynamics and cardiac metabolism. After 24 months of PAH specific therapy, we observed significant improvement in follow-up CPi – 0.23±0.04 W/m2 (p=0.04). Interestingly, baseline CPi predicted follow-up SUV RV/LV ratio. During 2-year observation, 16 patients (57%) had experienced CEP (including 4 deaths). Patients with CEP had higher baseline CPi than stable patients (0.32±0.09 vs 0.21±0.05, p=0.0006), as well as increased SUV RV/LV. CPi cut-off value to predict worse prognosis was 0.24 W/m2 (log-rank test, p=0.003, Figure) and CPi was also a significant predictor of CEP in multivariate analysis (R2 = 0.69; p=0.001).Conclusions:Indexed cardiac power output parameter is related with RV metabolism alterations in PAH and may help to identify stable patients at higher risk of death or clinical deterioration.

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Novembre 2023