During his journey on the Beagle, Darwin observed the uniformity in the elevation of coastal Eastern Patagonia along more than 2000 km. More than one century later, the sequences of Quaternary shorelines of eastern Patagonia have been described and their deposits dated but not yet interpreted in terms of geodynamics. Consequently, we i) mapped the repartition of the Quaternary coastal sequences in Argentinean Patagonia, ii) secured accurate altitudes of shoreline angles associated with erosional morphologies (i.e. marine terraces and notches), iii) took into account previous chrono-stratigraphical interpretations in order to calculate mean uplift rates since~440 ka (MIS 11) and proposed age ranges for the higher and older features (up to~180 m), and iv) focused on the Last Interglacial Maximum terrace (MIS 5e) as the best constrained marine terrace (in terms of age and altitude) in order to use it as a tectonic benchmark to quantify uplift rates along the entire passive margin of Eastern South America. Our results show that the eastern Patagonia uplift is constant through time and twice the uplift of the rest of the South American margin. We suggest that the enhanced uplift along the eastern Patagonian coast that interested Darwin during his journey around South America on the Beagle could originate from the subduction of the Chile ridge and the associated dynamic uplift.

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Introduction Although atrial fibrillation (AF) ablation has become increasingly safer, rehospitalization and emergency department (ED) evaluations can occur in the postablation period. Better understanding of the frequency, causes, and predictors for hospitalization and ED evaluation after ablation are needed, particularly as same‐day discharge programs expand. Methods The Optum Clinformatics database was used to define rates, causes, and predictors of hospital and ED care after AF ablation performed between January 2016 and May 2019. Primary outcomes were all‐cause hospital and ED care within 30 days of discharge. Independent predictors of all‐cause ED and hospital admissions care were determined via logistic regression. Results Of the 18 848 patients in this study, the mean age was 67.5 ± 10 years, 37.9% were female, and the mean CHA2DS2‐VASc score was 3.27 ± 1.84. Within 30 days of AF ablation, 1440 of 18 848 patients (7.6%) required hospital care of which 15% had >1 admission; 7.9% required ED care of which 28.6% had >1 ED visit. The most common reasons for hospital admission (which occurred on average 12.3 days after discharge) were supraventricular tachycardia (SVT) or AF (33.2%), heart failure (12.7%), and infection (12.2%). The most common reasons for ED care were SVT/AF (15.0%), noncardiac chest pain (13.3%), and noninfectious respiratory illness (12.2%). Age, female sex, ablation in an inpatient setting, and co‐morbidities were associated with increased risk of rehospitalization. Age, female sex, patient comorbidities, and non‐use of direct oral anticoagulation were associated with increased risk of ED visit. Conclusion Approximately 7%–8% of patients require unplanned hospitalization or ED care after AF ablation, most commonly due to SVT/AF. Predictors of unscheduled care include patient age, sex, and several patient comorbidities. This study can inform quality improvement initiatives by identifying common causes for unscheduled care.

En el campo de los estudios migratorios uno de los temas de investigación de larga tradición está constituido por las “segundas generaciones” o “hijos de migrantes”. En este artículo presentamos los problemas metodológicos derivados de la generación de datos primarios sobre el tópico: en primer lugar, la población es de tamaño pequeño y las encuestas tradicionales no capturan adecuadamente la información. En segundo lugar, la falta de un marco muestral adecuado, dado que no contamos con una lista exhaustiva de los miembros. Aquí desarrollamos una posible alternativa para solucionar estos problemas: el muestreo Respondent Driven Sampling (rds) para el estudio de los procesos de incorporación de hijos de migrantes en general e hijos de migrantes sur-sur en particular.