37 research outputs found
Mortality in patients after acute myocardial infarction managed by cardiologists and primary care physicians : a systematic review
Introduction Mortality following acute myocardial infarction (AMI) remains high despite of progress in invasive and noninvasive treatments. Objectives This study aimed to compare the outcomes of ambulatory treatment provided by cardiologists versus general practitioners (GPs) in postâAMI patients. Patients and methods We conducted a systematic search in 3 electronic databases for interventional and observational studies that reported allâcause mortality, mortality from cardiovascular causes, stroke, and myocardial infarction at longâterm followâup following AMI. We assessed the risk of bias of the included studies using the Risk of Bias in Nonrandomized Studies of Interventions (ROBINSâI) tool. For randomized trials, we used the revised Cochrane risk of bias tool (RoB 2.0). Results Two nonrandomized studies fulfilled the inclusion criteria. We assessed these studies as having a moderate risk of bias. We did not pool the results owing to significant heterogeneity between the studies. Patients consulted by both a cardiologist and a GP were at lower risk of allâcause death as compared with patients consulted by a cardiologist only (risk ratio [RR], 0.92; 95% CI, 0.85â0.99). Patients consulted by a cardiologist with or without GP consultation were at lower risk of allâcause death compared with those consulted by a GP only in both studies (RR, 0.8; 95% CI, 0.75â0.85 and RR, 0.44; 95% CI, 0.41â0.47). Conclusions Patients after AMI consulted by both a cardiologist and a GP may beat lower risk of death compared with patients consulted by a GP or a cardiologist only. However, these findings are based on moderateâquality nonrandomized studies. We found no evidence on the relation between the specialization of the physician and the risk of cardiovascular death, stroke, or myocardial infarction in AMI survivors
Manganites at Quarter Filling: Role of Jahn-Teller Interactions
We have analyzed different correlation functions in a realistic spin-orbital
model for half-doped manganites. Using a finite-temperature diagonalization
technique the CE phase was found in the charge-ordered phase in the case of
small antiferromagnetic interactions between electrons. It is shown
that a key ingredient responsible for stabilization of the CE-type spin and
orbital-ordered state is the cooperative Jahn-Teller (JT) interaction between
next-nearest Mn neighbors mediated by the breathing mode distortion of
Mn octahedra and displacements of Mn ions. The topological phase
factor in the Mn-Mn hopping leading to gap formation in one-dimensional models
for the CE phase as well as the nearest neighbor JT coupling are not able to
produce the zigzag chains typical for the CE phase in our model.Comment: 16 pages with 16 figures, contains a more detailed parameter estimate
based on the structural data by Radaelli et al. (accepted for publication in
Phys. Rev. B