心不全患者における夜間閉塞性アプネアから中央アプネアへの転移:PCO2と循環器の遅延の役割
R Tkacova1, M Niroumand, G Lorenzi-Filho
1Sleep Research Laboratory of the Toronto Rehabilitation Institute and the Department of Medicine of the Toronto General Hospital/University Health Network, University of Toronto, Toronto, Ontario, Canada.
Circulation
|February 24, 2001
まとめ
閉塞性心不全 (CHF) の患者では,二酸化炭素 (PCO2) 濃度の低下は,阻害性睡眠呼吸不全 (OSA) から中央睡眠呼吸不全 (CSA) へのシフトと関連しています. この変化は,夜間の心臓機能の悪化を示す可能性があります.
科学分野:
- 心臓病学 心臓病学
- 肺内科 肺内科 肺内科
- スリープ・メディシン (睡眠医学)
背景:
- 閉塞性心不全 (CHF) の患者は,しばしば阻害性睡眠時無呼吸症 (OSA) と中央睡眠時無呼吸症 (CSA) の両方を経験する.
- これらの患者におけるOSAとCSAの変動的発生の根本的な理由は不明である.
- 一つの仮説は,二酸化炭素 (PCO2) の部分圧力の変化が観察された無呼吸のタイプに影響を与え,PCO2の減少が潜在的にCSAを誘発することを示唆しています.
研究 の 目的:
- CHF患者のPCO2レベルの変化と睡眠時無呼吸のタイプ (OSA vs. CSA) の関係を調べる.
- PCO2の変化が睡眠中のOSAとCSAのシフトと関連しているかどうかを判断する.
- 心筋梗塞の患者における心臓機能とアプレアタイプとの潜在的な関連性を調査する.
主な方法:
- 夜間ポリソムノグラフィーは,CHFとOSAとCSAの共存の12人の患者に実施されました.
- 測定対象は,毎分換気量 (VI),皮膚経由のPCO2 (PtcCO2),循環時間,および周期的な呼吸サイクル長さでした.
- アプネアイベントは,阻害性 (OSA) または中枢性 (CSA) と分類され,夜を通して分析されました.
主要な成果:
- CSAのエピソードは,OSAのエピソードと比較して,分間の換気量がかなり高く,PtcCO2が低いことが特徴でした.
- CSAエピソードでは,循環時間と周期的な呼吸サイクル長さの有意な延長が観察されました.
- 一晩で顕著な変化が起こり,OSAイベントの割合が低下し,CSAイベントが増加し,PtcCO2.2の有意な減少と相関していました.
結論:
- CHFの患者では,睡眠中のOSAからCSAへの移行は,PCO2の減少と関連しています.
- このPCO2の減少と,その後の無呼吸タイプのシフトは,循環時間の延長によって示唆されるように,夜間の心臓機能の悪化を示唆する可能性があります.
- 心臓機能の変化は,CHF患者さんが経験する睡眠時無呼吸の種類を決定する上で重要な役割を果たしているようです.
関連する概念動画
Chemical Factors Affecting Respiration Centers
3.0K
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....
3.0K
Hyperpnea and Hyperventilation
4.3K
Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
4.3K
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
830
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...
830
Sleep Apnea
921
Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
The condition is more prevalent among...
The condition is more prevalent among...
921
Cardiopulmonary Resuscitation II: ACLS Airway Management
1.2K
Airway management is a key skill in emergency and critical care settings, as maintaining a clear airway is essential for adequate oxygenation and ventilation.Head Tilt-Chin Lift TechniqueThe head tilt-chin lift maneuver is an essential technique primarily used in patients without suspected cervical spine injuries. To perform this maneuver, one hand is placed on the patient’s forehead, and gentle pressure is applied backward to tilt the head. The fingertips of the other hand are positioned...
1.2K


