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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...

Overview of Systemic and Pulmonary Circulation

Overview of Systemic and Pulmonary Circulation

The systemic and pulmonary circuits are crucial components of the circulatory system, working together to transport blood between the heart, lungs, and the rest of the body. The process begins with pulmonary circulation, where deoxygenated blood is pumped from the right ventricle to the lungs via the pulmonary trunk and arteries. Upon reaching the lungs, the blood becomes oxygenated and returns to the heart, specifically to the left atrium, via the pulmonary veins.
The oxygenated blood is sent...

Overview of Systemic Arteries

Overview of Systemic Arteries

The human body is a complex, well-organized machine, and at the heart of its operations lies the circulatory system. This network of blood vessels, which includes systemic arteries, plays a vital role in maintaining life by transporting nutrients, oxygen, and waste products to and from cells throughout the body.
Systemic circulation is the part of the cardiovascular system that carries oxygenated blood away from the heart to the body's tissues and returns deoxygenated blood back to the heart.

Preparation and Reactions of Sulfides

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.

Heart Failure III: Clinical Manifestations

Heart Failure III: Clinical Manifestations

Heart failure (HF) manifests primarily as dyspnea, fatigue, and fluid retention, resulting in peripheral and pulmonary edema. Symptoms may vary depending on which ventricle is more affected, left or right.Left-Sided Heart FailureAlso known as left ventricular failure, this condition results from the left ventricle's inability to fill or eject sufficient blood into the systemic circulation. It leads to pulmonary congestion, which occurs when the left ventricle fails to eject blood effectively...

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...

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Related Experiment Video

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A Sensitive Visual Method for the Detection of Hydrogen Sulfide Producing Bacteria

A Sensitive Visual Method for the Detection of Hydrogen Sulfide Producing Bacteria

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Hydrogen sulphide in heart and systemic circulation.

Mariarosaria Bucci¹, Giuseppe Cirino

¹Department of Experimental Pharmacology, Faculty of Pharmacy, University of Naples -Federico II- Via Domenico Montesano 49, 80131 Naples, Italy.

Inflammation & Allergy Drug Targets

|February 1, 2011

Summary

Hydrogen sulfide (H(2)S) acts as a third gasotransmitter in the cardiovascular system, regulating vascular homeostasis and blood pressure. Its vasodilatory effects, mediated by K(ATP) channels, are crucial for cardiovascular function.

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Published on: September 22, 2023

Area of Science:

Cardiovascular Physiology
Gasotransmitter Signaling
Vascular Biology

Background:

Hydrogen sulfide (H(2)S) is recognized as the third endogenous gasotransmitter alongside nitric oxide (NO) and carbon monoxide (CO).
The enzyme cystathionine-γ-lyase (CSE) synthesizes H(2)S from L-cysteine in the vasculature.
H(2)S plays a significant role in maintaining vascular homeostasis.

Purpose of the Study:

To explore the physiological roles of H(2)S in the mammalian cardiovascular system.
To investigate the mechanisms underlying H(2)S-induced vasodilation.
To examine the interplay between H(2)S and other signaling pathways in vascular regulation.

Main Methods:

Administration of H(2)S (NaHS) to assess effects on arterial relaxation.
Investigation of K(ATP) channel involvement in H(2)S-mediated vasodilation.
Analysis of the cross-talk between L-cysteine/H(2)S and L-Argine/NO pathways.

Main Results:

H(2)S induces concentration-dependent relaxation in large conduit and peripheral resistance arteries.
Vasodilation by H(2)S is dependent on the activation of K(ATP) channels.
H(2)S acts as a non-selective phosphodiesterase inhibitor and interacts with the NO pathway.

Conclusions:

H(2)S is a critical regulator of vascular tone, resistance, and systemic blood pressure.
The L-cysteine/H(2)S pathway has implications for erectile function, though its role in dysfunction requires further study.
Further research is needed to fully elucidate H(2)S physiology in the cardiovascular system, particularly due to limitations in available tools.