Atrial fibrillation and atrial flutter share a common reentrant mechanism. However, the relationship between these arrhythmias has not been systemically studied to date. To evaluate the degree to which these arrhythmias may alternate, consecutive Holter monitor recordings which showed fibrillation or flutter in 96 patients were reviewed. One half of the patients were studied after open-heart su...

Abstract We use three quasi-natural experiments in Mexico and one Panama to estimate the effects of having option pay with cash on Uber rides. The ability affects demand for rides, which is reflected large changes total number trips, fares, miles, users after introduced payments, particularly lower-income city blocks. On other hand, prices, estimated times arrival, competitor pricing are neglig...

The Symbol Digit Modalities Test (SDMT) is a widely used instrument to assess information processing speed, attention, visual scanning, and tracking. Considering that repeated evaluations are a common need in neuropsychological assessment routines, we explored test-retest reliability and practice effects of two alternate SDMT forms with a short inter-assessment interval. A total of 123 universi...