ハイパーカレミア,低体温,心臓麻痺の溶液と血液再注入による輸液後の微循環機能障害. アデノシンによる効果
M W Keller1, L Geddes, W Spotnitz
1Department of Medicine, University of Virginia Health Sciences Center, University of Virginia, Charlottesville 22908.
Circulation
|December 1, 1991
まとめ
低熱性,高カリミ性心臓麻痺治療法は,心臓外科手術の再注射中にマイクロ血管に損傷を与える可能性があります. アデノシンは,血管を広げ,中性粒子の蓄積を減らすことで,この損傷を部分的に軽減することができます.
科学分野:
- 心血管外科手術についてです.
- 血管生物学 血管生物学
- マイクロ循環研究 マイクロ循環研究
背景:
- 心臓外科手術中の心筋縮治療は,心筋縮の保存に不可欠です.
- しかし,リパーフュージョン損傷と心症に起因する内皮機能不全は,手術後の心臓機能を損なう可能性があります.
- 冠動脈と静脈移植に対する心臓麻痺溶液の影響は知られていますが,マイクロ血管系への影響はあまり理解されていません.
研究 の 目的:
- ハイパーカレミック・クリスタロイド・カルディオペレジック溶液による輸液およびその後の血液再輸液によるマイクロ血管損傷を調査する.
- アデノシンとアルバミンの潜在的な保護効果を評価し,この損傷を軽減する.
主な方法:
- ハムスターのクレマスター筋肉モデルを用いて,心筋麻痺溶液注射と血液再注射中のマイクロ血管の変化を観察した.
- 腸内顕微鏡では,動脈管の直径,毛細血管の perfusion 密度,および中性粒子の蓄積を評価しました.
- ミエロペロキシダースレベルは,血管外中性粒子の浸透を定量化するために測定されました.
主要な成果:
- クリスタロイド心筋梗塞溶液の perfusion は,動脈血管収縮と毛細血管 perfusion の減少につながった.
- 中性粒子の蓄積の有意な増加は,静脈内皮および血管外で観察されました.
- アデノシンとアルバミンを心臓麻痺剤溶液に添加し,再注射中にアデノシンを投与すると,動脈血管拡張と中性粒子の蓄積が減少したが,毛細血管 perfusion が減少したままである.
結論:
- 低熱性,高カリミ性,結晶性心臓損傷溶液は,血流の減少と中性粒子の蓄積の増加によって特徴づけられるマイクロ血管損傷を誘発します.
- アデノシンは,血管拡張を促進し,中性粒子の浸透を減少させることで,この損傷を部分的に緩和する可能性を示しています.
関連する概念動画
Blood Flow
Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
Muscle Recovery and Fatigue
Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective response...
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...
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...
Liver Physiology
The liver, an essential organ in the human body, performs over 200 vital functions that can be broadly categorized into metabolic, hematological, endocrine regulation, and bile production.
Metabolic Regulation:
The liver is the central organ involved in regulating blood composition. It stabilizes blood glucose levels, maintaining them within the range of 70–110 mg/dL. When these levels drop, the liver breaks down glycogen reserves and releases glucose into the bloodstream. It can also...
Metabolic Regulation:
The liver is the central organ involved in regulating blood composition. It stabilizes blood glucose levels, maintaining them within the range of 70–110 mg/dL. When these levels drop, the liver breaks down glycogen reserves and releases glucose into the bloodstream. It can also...
Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers
Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
Myocarditis I: Introduction
Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...


