周辺の化学受容体の過敏症:慢性心不全の患者の不吉な兆候である
P Ponikowski1, T P Chua, S D Anker
1Clinical Cardiology, NHLI, London, UK. piotrponikowski@hotmail.com
Circulation
|August 2, 2001
まとめ
慢性心不全 (CHF) 患者における過敏な周辺化学受容体は,独立してより悪い予後を予測します. この高反射は,バロリフレクスの感受性の低下とCHFの悪い結果との関連を説明する可能性がある.
科学分野:
- 心臓病学 心臓病学
- 呼吸器生理学 呼吸器生理学とは
- クリニカル・メディシン 臨床医学
背景:
- 周辺化学受容体の過敏は,慢性心不全 (CHF) の異常な心呼吸器反射制御と関連しています.
- この過敏性は,交感性過剰活動,減退したバロレフレクスの感受性 (BRS),およびCHF患者の運動中の過度の呼吸に寄与する可能性があります.
研究 の 目的:
- 増幅された外周化学反応感受性が,心血管不全の患者において,独立した予後的有意性を有するかどうかを調査する.
主な方法:
- 80人のCHF患者で,周辺化学反応 (低酸素に対する呼吸器反応) とBRSを評価した.
- 化学感受性のために純粋な窒素を一時的に吸入し,BRSのためにフェニレフリン/スペクトル法を使用しました.
- 死亡率を記録するために,患者さんを平均41ヶ月間追跡した.
主要な成果:
- CHFの患者は,基準値と比較して,外周化学反応感度が増加し,BRSが低下した.
- 高い外周化学反応感受性は,独立して生存障害を予測した (HR 3.2, P=0.0006).
- 3年生存率は,正常な化学反応感受性 (77%,P=0.0002) と比較して,周辺の化学反応感受性が高い患者 (41%) で有意に低かった.
結論:
- 周回性化学受容体の過敏症は, ambulatory CHF患者における不良予後を予測する独立した予測因子である.
- この過活発な反射は,CHFにおけるバロレフレクスの感受性の低下の予後効果を媒介する可能性があります.
関連する概念動画
Pathophysiology of Heart Failure
4.8K
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...
4.8K
Chemical Factors Affecting Respiration Centers
2.7K
Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
CO2 has a potent influence on respiration and is strictly regulated....
CO2 has a potent influence on respiration and is strictly regulated....
2.7K
Acute Respiratory Failure-III
1.3K
Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without...
1.3K
Acute Respiratory Failure-IV
824
Respiratory failure can manifest suddenly or gradually, characterized by a rapid decline in PaO2 and a rapid rise in PaCO2. This situation indicates a severe respiratory problem that may quickly become a life-threatening emergency. One of the early signs of hypoxemic Acute Respiratory Failure (ARF) is a change in mental status due to the brain's sensitivity to oxygen levels and changes in acid-base balance. Symptoms such as restlessness, confusion, and agitation suggest inadequate oxygen...
824
Heart Failure II: Pathophysiology
1.9K
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...
1.9K
Heart Failure III: Clinical Manifestations
1.2K
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...
1.2K


