Role of T-type calcium channel subunits in post-myocardial infarction remodelling probed with genetically engineered mice
Khaï Le QuangPatrice NaudXiaoyan QiFrancine DuvalYanfen ShiMarc‐Antoine GillisPhilippe ComtoisJean‐Claude TardifDanshi LiPaul LévesqueDobromir DobrevFlavien CharpentierStanley Nattel
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AimsPrevious studies suggested that T-type Ca2+-current (ICaT)-blockers improve cardiac remodelling, but all available ICaT-blockers have non-specific actions on other currents and/or functions. To clarify the role of ICaT in cardiac remodelling, we studied mice with either of the principal cardiac ICaT-subunits (Cav3.1 or Cav3.2) knocked out.Heart failure is a clinical syndrome associated with poor quality of life, substantial healthcare resource utilization, and premature mortality, in large part related to high rates of hospitalizations. The clinical manifestations of heart failure are similar regardless of the ejection fraction. Unlike heart failure with reduced ejection fraction, there are few therapeutic options for treating heart failure with preserved ejection fraction. Molecular therapies that have shown reduced mortality and morbidity in heart failure with reduced ejection have not been proven to be effective for patients with heart failure and preserved ejection fraction. The study of pathophysiological processes involved in the production of heart failure with preserved ejection fraction is the basis for identifying new therapeutic means. In this narrative review, we intend to synthesize the existing therapeutic means, but also those under research (metabolic and microRNA therapy) for the treatment of heart failure with preserved ejection fraction.
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Cardiac Rupture
Heart Rupture
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To study the characteristics and prognostic implications of type 2 diabetes in different heart failure entities from a nationwide perspective.This observational study comprised 30,696 heart failure patients prospectively included in the Swedish Heart Failure Registry (SwedeHF) 2003-2011 from specialist care, with mortality information available until December 2014. Patients were categorized into three heart failure entities by their left ventricular ejection fraction (heart failure with preserved ejection fraction: ⩾50%, heart failure with mid-range ejection fraction: 40%-49% and heart failure with reduced ejection fraction: <40%). All-cause mortality stratified by type 2 diabetes and heart failure entity was studied by Cox regression.Among the patients, 22% had heart failure with preserved ejection fraction, 21% had heart failure with mid-range ejection fraction and 57% had heart failure with reduced ejection fraction. The proportion of type 2 diabetes was similar, ≈25% in each heart failure entity. Patients with type 2 diabetes and heart failure with preserved ejection fraction were older, more often female and burdened with hypertension and renal impairment compared with heart failure with mid-range ejection fraction and heart failure with reduced ejection fraction patients among whom ischaemic heart disease was more common. Type 2 diabetes remained an independent mortality predictor across all heart failure entities after multivariable adjustment, somewhat stronger in heart failure with left ventricular ejection fraction below 50% (hazard ratio, 95% confidence interval; heart failure with preserved ejection fraction: 1.32 [1.22-1.43], heart failure with mid-range ejection fraction: 1.51 [1.39-1.65], heart failure with reduced ejection fraction: 1.46 [1.39-1.54]; p-value for interaction, p = 0.0049).Type 2 diabetes is an independent mortality predictor across all heart failure entities increasing mortality risk by 30%-50%. In type 2 diabetes, the heart failure with mid-range ejection fraction entity resembles heart failure with reduced ejection fraction in clinical characteristics, risk factor pattern and prognosis.
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Diastolic heart failure
Concomitant
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ABSTRACT: Left ventricular ejection fraction was measured by gated wall motion in 62 patients, 75 years old or older, admitted to a Geriatric Acute Assessment Ward. From this group, 42 patients not taking digitalis or other cardioactive medication were selected for analysis. Thirty of them had clinically identifiable heart disease, whereas 12 did not. Resting left ventricular ejection fractions in the 12 patients without clinically identifiable heart disease averaged 0.60 ± 0.09. None had an ejection fraction below 0.50. In the 30 patients with clinically identifiable heart disease, mean ejection fraction was 0.49 ± 0.15 (range 0.17‐0.84), P < 0.01. In the patients with heart disease, reduction of ejection fraction was correlated with either cardiac enlargement or congestive heart failure. Neither age nor electrocardiographic abnormalities added to the strength of this correlation. Fifty‐eight per cent of patients with congestive heart failure had ejection fractions 3=0.40, suggesting that congestive heart failure in this age group is frequently related to diastolic left ventricular dysfunction unaccompanied by major systolic dysfunction. The prognosis of patients with congestive heart failure and ejection fractions above 0.35 was significantly better than of patients with congestive heart failure and ejection fractions below 0.35. From these data and other data available in the literature, it is proposed that the lower limit for ejection fraction be 0.50 for patients 75 years old or older. Congestive heart failure in patients 75 years old or older appears to be associated with relatively higher ejection fractions or even with ejection fractions within the normal range. In these patients, digitalis may not be indicated, and short term‐prognosis is relatively favorable.
Hypertensive heart disease
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Background Although the predictive value of galectin-3 for heart failure with preserved ejection fraction has been demonstrated, the diagnostic value remains unclear. The present study was performed to address this issue. Hypothesis Galectin-3 has diagnostic value for heart failure with preserved ejection fraction. Methods This is a diagnostic experiment. We conducted an observational study of 223 patients with combined symptoms of heart failure and diseases that can lead to heart failure with preserved ejection fraction. Patients were grouped into the heart failure group and control group in accordance with the 2016 European Society of Cardiology heart failure guidelines for heart failure with preserved ejection fraction. Baseline information and serum galectin-3 concentration were assessed within 24 h after admission. Results Serum galectin-3 concentration was significantly higher in the heart failure group compared with the control group. Binary logistic regression analysis showed that higher galectin-3 concentration was associated with the occurrence of heart failure with preserved ejection fraction. The area under the curve of galectin-3 was 0.763, indicating that galectin-3 has moderate diagnostic value for heart failure with preserved ejection fraction. Galectin-3 >15.974 ng/mL identified heart failure with preserved ejection fraction with 76.0% sensitivity and 71.9% specificity. Conclusions There was a correlation between galectin-3 and heart failure with preserved ejection fraction, and galectin-3 was an independent predictor of heart failure with preserved ejection fraction. The diagnostic value of galectin-3 for heart failure with preserved ejection fraction was moderate (AUC: 0.763, 95% CI: 0.696–0.821, P < 0.01, and the sensitivity is 76.0% while the specificity is 71.9% at the threshold 15.974 ng/mL) and was higher than that of interventricular septal thickness or E/A ratio.
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AIM To observe the effect of qidantongmai Tablet (QDTMT) on the changes of cardiac troponin I in rabbits following their death caused by ligation-induced acute myocardial infarction (AMI) and its mechanism. METHODS We observed the preventive effects of QDTMT on AMI after a 14-day intrgastric QDTMT administration in the model of coronary artery left circumflex ligation-induced acute myocardial infarction. RESULTS ①Obvious myocardial infarction was found in the model group but myocardial infarction in QDTMT groups alleviated significantly (P0.01) and the infarction area shrunk (P0.01). ②Light microscope and electron microscope showed that QDTMT significantly reduced pathological injury in myocardium and improved the ultramicrostructure of cells. ③The content of cTnI significantly decreased in QDTMT groups, significantly different from that in the model group (P0.05 or P0.01). CONCLUSION QDTMT has obvious protective effect on myocardium in rabbits with ligation-induced acute myocardial infarction.
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Last two decade, heart failure with preserved ejection fraction was deprived from being considered as a part of spectrum of heart failure. May be heart failure with preserved ejection fraction was common but not recognized by cardiology fraternity. Heart failure with reduced ejection fraction and heart failure with preserved ejection fraction each make up about half of the overall heart failure burden. But the paradox is: morbidity and mortality in heart failure with preserved ejection fraction despite being similar to patients with heart failure with reduced ejection fraction, today’s cardiology community has not much to offer in terms of mortality reducing treatment. The term diastolic heart failure has been well replaced by heart failure with preserved ejection fraction because multiple non-diastolic abnormalities in cardiovascular function also contribute to heart failure with preserved ejection fraction and diastolic dysfunction always accompanied heart failure with reduced ejection fraction. Diagnosis of heart failure with preserved ejection fraction is an uphill task since it relies upon careful clinical evaluation, doppler (pulse wave and tissue) echocardiography, and invasive hemodynamic assessment after exclusion of potential noncardiac causes of symptoms suggestive of heart failure. Patients with heart failure with preserved ejection fraction are usually older women with a history of hypertension. Obesity, coronary artery disease, diabetes mellitus, and atrial fibrillation are also highly prevalent in heart failure with preserved ejection fraction. Cornerstone of treatment of this entity revolves around treatment of underlying cause and symptom guided therapy. Nepalese Heart Journal | Volume 10 | No.1 | November 2013| Pages 46-56 DOI: http://dx.doi.org/10.3126/njh.v10i1.9747
Diastolic heart failure
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• Chronic heart failure with preserved ejection fraction is as common as chronic heart failure with reduced ejection fraction.• After hospitalization for heart failure with preserved ejection fraction, prognosis and rehospitalization rates are comparable to heart failure with reduced ejection fraction.• Systolic function of the cardiac muscle is impaired in heart failure with preserved ejection fraction.• According to a recent consensus statement of the Heart Failure Association of the European Society of Cardiology, the diagnosis of heart failure with preserved ejection fraction remains challenging, but the use of serum brain natriuretic peptide (BNP) and tissue Doppler imaging (TDI) has increased accuracy.• Treatment of heart failure with preserved ejection fraction should be empiric, and phenotype-oriented as well as symptom-oriented.
Brain natriuretic peptide
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