Differential changes in sympathetic activity in left and right ventricles in congestive heart failure after myocardial infarction

1997 ◽  
Vol 133 (3) ◽  
pp. 340-345 ◽  
Author(s):  
Pallab K. Ganguly ◽  
Ken S. Dhalla ◽  
Qiming Shao ◽  
Robert E. Beamish ◽  
Naranjan S. Dhalla
1998 ◽  
Vol 30 (11) ◽  
pp. 2153-2163 ◽  
Author(s):  
Rajat Sethi ◽  
Vijayan Elimban ◽  
Donald Chapman ◽  
Ian M.C. Dixon ◽  
Naranjan S. Dhalla

1997 ◽  
Vol 272 (2) ◽  
pp. H884-H893 ◽  
Author(s):  
R. Sethi ◽  
K. S. Dhalla ◽  
R. E. Beamish ◽  
N. S. Dhalla

The status of beta-adrenergic receptors and adenylyl cyclase in crude membranes from both left and right ventricles was examined when the left coronary artery in rats was occluded for 4, 8, and 16 wk. The adenylyl cyclase activity in the presence of isoproterenol was decreased in the uninfarcted (viable) left ventricle and increased in the right ventricle subsequent to myocardial infarction. The density of beta1-adrenergic receptors, unlike beta2-receptors, was reduced in the left ventricle, whereas no change in the characteristics of beta1- and beta2-adrenergic receptors was seen in the right ventricle. The catalytic activity of adenylyl cyclase was depressed in the viable left ventricle but was unchanged in the right ventricle. In comparison to sham controls, the basal, as well as NaF-, forskolin-, and 5'-guanylyl imidodiphosphate [Gpp(NH)p]-stimulated adenylyl cyclase activities were decreased in the left ventricle and increased in the right ventricle of the experimental animals. Opposite alterations in the adenylyl cyclase activities in left and right ventricles from infarcted animals were also seen when two types of purified sarcolemmal preparations were employed. These changes in adenylyl cyclase activities in the left and right ventricles were dependent on the degree of heart failure. Furthermore, adenosine 3',5'-cyclic monophosphate contents were higher in the right ventricle and lower in the left ventricle from infarcted animals injected with saline, isoproterenol, or forskolin in comparison to the controls. The results suggest differential changes in the viable left and right ventricles with respect to adenylyl cyclase activities during the development of congestive heart failure due to myocardial infarction.


1992 ◽  
Vol 262 (3) ◽  
pp. H868-H874 ◽  
Author(s):  
N. Afzal ◽  
N. S. Dhalla

To examine the status of sarcoplasmic reticulum (SR) with respect to Ca2+ transport in congestive heart failure due to myocardial infarction, the left coronary artery in rats was ligated for 4, 8, and 16 wk. The left heart function was assessed with an intraventricular pressure transducer, and SR membrane fractions from the right ventricle and the viable left ventricle were isolated for measuring the ATP-dependent Ca2+ uptake activities. In comparison to sham-operated controls, SR Ca2+ uptake activity was decreased in viable left ventricle of the experimental animals at 4, 8, and 16 wk. On the other hand, SR Ca2+ uptake activity in the right ventricle was increased at 4 and 8 wk, but no change was apparent at 16 wk of coronary occlusion. The decrease in SR Ca2+ uptake in left ventricle and increase in right ventricle were associated with corresponding changes in maximal velocity values without any alterations in the affinity for Ca2+. These opposite changes in the right and left ventricles were dependent on the scar size as well as time after inducing the myocardial infarction. The SR Ca(2+)-stimulated adenosinetriphosphatase activity was decreased in left ventricle and increased in the right ventricle from 4 wk experimental animals. The results suggest differential remodeling of the SR membranes with respect to Ca(2+)-pump mechanisms in left and right ventricles during the development of congestive heart failure.


2020 ◽  
Vol 9 (8) ◽  
pp. 931-938 ◽  
Author(s):  
Mattias Skielta ◽  
Lars Söderström ◽  
Solbritt Rantapää-Dahlqvist ◽  
Solveig W Jonsson ◽  
Thomas Mooe

Aims: Rheumatoid arthritis may influence the outcome after an acute myocardial infarction. We aimed to compare trends in one-year mortality, co-morbidities and treatments after a first acute myocardial infarction in patients with rheumatoid arthritis versus non-rheumatoid arthritis patients during 1998–2013. Furthermore, we wanted to identify characteristics associated with mortality. Methods and results: Data for 245,377 patients with a first acute myocardial infarction were drawn from the Swedish Register of Information and Knowledge about Swedish Heart Intensive Care Admissions for 1998–2013. In total, 4268 patients were diagnosed with rheumatoid arthritis. Kaplan-Meier analysis was used to study mortality trends over time and multivariable Cox regression analysis was used to identify variables associated with mortality. The one-year mortality in rheumatoid arthritis patients was initially lower compared to non-rheumatoid arthritis patients (14.7% versus 19.7%) but thereafter increased above that in non-rheumatoid arthritis patients (17.1% versus 13.5%). In rheumatoid arthritis patients the mean age at admission and the prevalence of atrial fibrillation increased over time. Congestive heart failure decreased more in non-rheumatoid arthritis than in rheumatoid arthritis patients. Congestive heart failure, atrial fibrillation, kidney failure, rheumatoid arthritis, prior diabetes mellitus and hypertension were associated with significantly higher one-year mortality during the study period 1998–2013. Conclusions: The decrease in one-year mortality after acute myocardial infarction in non-rheumatoid arthritis patients was not applicable to rheumatoid arthritis patients. This could partly be explained by an increased age at acute myocardial infarction onset and unfavourable trends with increased atrial fibrillation and congestive heart failure in rheumatoid arthritis. Rheumatoid arthritis per se was associated with a significantly worse prognosis.


Circulation ◽  
2021 ◽  
Vol 143 (Suppl_1) ◽  
Author(s):  
Scott Mu ◽  
Caitlin W Hicks ◽  
Natalie R Daya ◽  
Randi E Foraker ◽  
Anna Kucharska-newton ◽  
...  

Introduction: Hospitalization is a complex health exposure and the period immediately following acute-care hospitalization is a high-risk state. Self-rated health is a subjective indicator of health and the long-term trends in self-rated health after hospitalization are not well characterized. Hypotheses: 1. Self-rated health decreases after hospitalization, with only partial recovery in the following years. 2. Poor self-rated health after hospitalization is associated with increased mortality. Methods: We analyzed 13,758 participants in the Atherosclerosis Risk in Communities (ARIC) Study with at least 1 hospitalization. Self-rated health was assessed annually and rated on a 4-point scale as follows: “Over the past year, compared to other people your age, would you say that your health has been excellent(=4), good(=3), fair(=2) or poor(=1)?" Using Cox regression and Kaplan-Meier methods, we evaluated mortality after hospitalization for myocardial infarction, congestive heart failure, cerebrovascular disease, pneumonia or diabetes mellitus with complications. Results: The mean self-rated health the year prior to hospitalization was 2.82 and the nadir of self-rated health was 2.62, occurring 1 year after hospitalization (Fig 1a). As compared to “excellent” self-rated health, “poor” self-rated health after any hospitalization was strongly associated with mortality (HR 4.65, 95% CI 4.27-5.07). Corresponding HRs (95% CI) for mortality post-hospitalization were 3.12 (2.30-4.22) for acute myocardial infarction, 3.08 (2.39-3.96) for congestive heart failure, 2.15 (1.43-3.23) for acute cerebrovascular disease, 4.54 (3.39-6.09) for pneumonia, and 3.32 (2.35-4.69) for diabetes mellitus with complications (Fig 1b). Conclusion: Mean self-rated health decreases significantly after hospitalization and worse self-rated health is associated with higher mortality. Self-rated health is an easily obtained patient centered outcome with valuable prognostic information.


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