関連する実験動画
Updated: May 12, 2026
11:40
Quantitative Autonomic Testing
Published on: July 19, 2011
傾きテスト中に誘発される昏睡の調節剤としての内生アデノシンの役割
Alain Y Saadjian1, Samuel Lévy, Fréderic Franceschi
1Division of Cardiology, Centre Hospitalo-Universitaire Nord, Marseille, France.
Circulation
|July 31, 2002
まとめ
ヘッド・アップ・ティルト・テストで陽性だった患者は,プラズマのアデノシン濃度 (APL) が高くなります. APLは昏睡中に増加し,アデノシンが示唆される.
科学分野:
- 心臓病学 心臓病学
- 神経科学は神経科学である.
- 薬理学 薬理学とは
背景:
- 以前の研究によると,アデノシンは,感受性の高い個体において血管系反応を誘発する可能性があります.
- 傾きテストによって誘発された静脈筋 (vasovagal syncope) 時の内生性アデノシンプラズマレベル (APLs) についてはほとんど知られていない.
研究 の 目的:
- ヘッド・アップ・ティルト・テストの陽性と陰性を持つ患者の間でAPLが異なるかどうかを判断する.
- 傾斜誘発性静脈筋梗塞の際にAPLが変化するかどうかを調査する.
主な方法:
- アデノシンプラズマ濃度 (APL) は,説明不可能なシンコペの26人の患者で,ヘッドアップ・ティルト・テストで測定されました.
- 患者は,陽性 (n=11) と陰性 (n=15) の傾斜テストグループに分けられた.
主要な成果:
- 陽性なチルトテストを受けた患者は,陰性テストを受けた患者 (0.39ミクロモール/L) と比べて,ベースラインAPL (2.66ミクロモール/L) が著しく高かった.
- 傾き誘発性シンコープの間,APLはベースライン (4.03マイクロモール/L) から52%増加しました.
- 昏睡時の高いAPLは,症状の発症までの短い時間と相関していました.
結論:
- 上昇したAPLは,陽性な傾きテストを受けた患者で観察されます.
- APLは,傾斜テストによって誘発された昏睡の間に増加します.
- アデノシン放出は,傾きテストの際に失眠を誘発することに関与しているようです.
関連する概念動画
01:25Adrenergic Agonists: Indirect-Acting Agents
Indirect-acting adrenergic agonists potentiate the effects of endogenous catecholamines through different mechanisms without directly binding to adrenoceptors.
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral bioavailability, and...
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral bioavailability, and...
01:24Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers
Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which indirectly block calcium...
01:26Heart Failure Drugs: Inotropic Agents
Positive inotropic agents are commonly used as the first line of treatment for heart failure. One such agent is digoxin, derived from the genus Digitalis, which has been known for centuries but effectively utilized since 1785. However, these cardiac glycosides can have potentially toxic effects due to their mechanism of action, which involves inhibiting Na+/K+-ATPase and increasing contractility. Digoxin is absorbed orally and distributed in various tissues, including the CNS. It has a long...
01:17Sedatives and Hypnotics Drugs: Miscellaneous Agents
Sedatives and hypnotics encompass a wide range of substances, each with its unique mechanism of action, uses, and potential adverse effects.
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...