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Heart Failure I: Introduction

Heart Failure I: Introduction

Heart failure refers to a clinical syndrome caused by structural or functional cardiac disorders that prevent the heart from pumping an adequate amount of blood to meet the body's metabolic needs. This condition often arises from myocardial infarction or ischemia, leading to decreased cardiac output, reduced tissue perfusion, impaired gas exchange, fluid volume imbalance, and decreased functional ability.Heart failure can result from disruptions in the mechanisms that regulate cardiac output...

Heart Failure IV: Classification and Diagnostic Evaluation

Heart Failure IV: Classification and Diagnostic Evaluation

Heart failure can be classified in various ways, with the most common classifications based on physical activity limitations, disease progression, severity, and treatment strategies.The Functional Classification of Heart Failure divides patients into four categories based on physical activity limitation due to symptom burden.Class I: Patients in this class have cardiac disease but no physical activity limitations. Ordinary activities like walking, climbing stairs, or routine tasks do not cause...

Pathophysiology of Heart Failure

Pathophysiology of Heart Failure

Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...

Heart Failure II: Pathophysiology

Heart Failure II: Pathophysiology

Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...

Heart Failure VII: Nursing Interventions

Heart Failure VII: Nursing Interventions

The first step in nursing management of a patient with heart failure involves thoroughly assessing the patient's medical history.Subjective Data: Obtain the patient's medical history of coronary artery disease, hypertension, myocardial infarction, and symptoms like dyspnea, orthopnea, and paroxysmal nocturnal dyspnea.Objective Data: Conduct a physical examination to identify findings such as jugular vein distention, pulmonary crackles, tachycardia, murmurs, peripheral edema, and vital signs,...

Imbalances in Cardiac Output

Imbalances in Cardiac Output

The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...

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Updated: Jun 19, 2026

Cutoff Value of Phase Angle by Bioelectrical Impedance Analysis at Admission as a Prognostic Factor in Patients with Acute Heart Failure

Cutoff Value of Phase Angle by Bioelectrical Impedance Analysis at Admission as a Prognostic Factor in Patients with Acute Heart Failure

Published on: June 10, 2025

Risk factors for heart failure: a population-based case-control study.

Shannon M Dunlay¹, Susan A Weston, Steven J Jacobsen

¹Division of Cardiovascular Diseases, Mayo Clinic, Rochester, MN, USA.

The American Journal of Medicine

|October 27, 2009

Summary

This summary is machine-generated.

Preventing coronary disease and hypertension is key to reducing heart failure. These risk factors, along with diabetes and smoking, have a significant population attributable risk (PAR) for heart failure.

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Last Updated: Jun 19, 2026

Cutoff Value of Phase Angle by Bioelectrical Impedance Analysis at Admission as a Prognostic Factor in Patients with Acute Heart Failure

Cutoff Value of Phase Angle by Bioelectrical Impedance Analysis at Admission as a Prognostic Factor in Patients with Acute Heart Failure

Published on: June 10, 2025

Area of Science:

Cardiovascular epidemiology
Public health research
Risk factor analysis

Background:

The relative contribution of various risk factors to heart failure development is not well-established.
Changes in risk factor contributions over time and differences by sex remain unclear.
Limited population-based studies exist on heart failure risk factors.

Purpose of the Study:

To estimate the population attributable risk (PAR) of key risk factors for heart failure in a community setting.
To analyze trends in risk factor prevalence and their impact on heart failure incidence.
To investigate potential sex-specific differences in risk factor contributions to heart failure.

Main Methods:

Utilized the Rochester Epidemiology Project to identify 962 incident heart failure cases (1979-2002).
Age and sex-matched cases with population-based controls.
Determined the frequency of risk factors (coronary heart disease, hypertension, diabetes, obesity, smoking), odds ratios, and PAR.

Main Results:

The average number of risk factors per heart failure case was 1.9 and increased over time.
Hypertension (66%) and smoking (51%) were the most prevalent risk factors.
Coronary heart disease and hypertension each accounted for 20% of heart failure cases (PAR), with coronary disease highest in men (23%) and hypertension in women (28%).

Conclusions:

Preventing coronary heart disease and hypertension offers the greatest potential for reducing heart failure incidence.
Sex-targeted prevention strategies may provide additional benefits.
Continued surveillance of heart failure risk factors is crucial due to potential changes in their relationships over time.