関連する実験動画
Updated: Jun 18, 2026

09:12
A Pre-Clinical Porcine Model of Orthotopic Heart Transplantation
Published on: April 27, 2019
心臓移植を受けた患者の運動中に異常な神経内分泌反応
R W Braith1, C E Wood, M C Limacher
1Center for Exercise Science, College of Medicine, University of Florida, Gainesville 32610.
Circulation
|November 1, 1992
まとめ
心臓移植を受けた患者は,心臓のメカニカル受容体信号が失われることにより,激しい運動中に過剰な神経内分泌反応を示します. この慢性的な神経内分泌の過剰活動は,これらの患者の高血圧に寄与する可能性があります.
科学分野:
- 心血管生理学 心血管の生理学
- 神経内分泌学の神経内分泌学
- 移植医学 移植医学について
背景:
- 運動は通常,神経内分泌の活動を刺激し,心臓のメカニカル受容体アファレントによって緩衝されます.
- オーソトープ心臓移植は,これらのアファレント経路を断ち切って,身体活動中に過剰な反応につながる可能性があります.
研究 の 目的:
- 心臓移植を受けた患者の運動に対する神経内分泌反応を,対照群と比較して調査する.
- 心臓のメカニカル受容体アファレントの喪失が,運動中に神経内分泌の調節に影響するかどうかを判断する.
主な方法:
- 心臓移植を受けた11人の被験者と,グレード別およびサブマキシマム運動 (40%と70%のピークパワー) 中の11人の対照群を比較した.
- ノルエピネフリン,バソプレシン,レニン活性,心房ナトリウレチンペプチド,アンジオテンシンII,アルドステロンの血濃度が,休息状態および運動中に測定された.
- 評価された心拍数,知覚された運動量,およびプラズマ容量の変化.
主要な成果:
- 心臓移植を受けた患者には,静止プラズマレニン活性と心房内ナトリウレチンペプチドが上昇した.
- 神経内分泌ホルモンの相対的な変化は,ピークパワーの40%で似ているが,ピークパワーの70%で受給者および段階的な運動中により大きい.
- グループ間では,心拍数,運動感,または血量減少の有意な違いは観察されなかった.
結論:
- 心臓のメカニカル受容体アファレントの切除は,心臓移植受容体において,抵抗のない神経内分泌刺激を引き起こす可能性が高い.
- 慢性神経内分泌の過剰活性症は,心臓移植を受けた ambulatory 患者の場合も存在することがあります.
- 腎臓の体積調節を変化させるこの過活性は,サイクロスポリン腎臓毒性とともに高血圧に寄与する可能性があります.
関連する概念動画
Heart 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...
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...
Exercise and Cardiovascular Response
Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Cardiac Catheterization IV: Nursing Management
Nursing responsibilities before cardiac catheterization include:Assess for allergies and establish baseline health status.Before cardiac catheterization, assess the patient for allergies to contrast dye. Perform a comprehensive baseline assessment, including vital signs, heart and breath sounds, and a neurovascular assessment of the extremities, noting distal pulses, skin color, and temperature. Instruct the patient to fast for 8-12 hours before the procedure. Evaluate baseline laboratory...
Cardiomyopathy V: Interprofessional Care
Managing cardiomyopathy involves addressing underlying or precipitating causes, treating heart failure with medications, and implementing dietary changes and a balanced exercise and rest regimen.Lifestyle ModificationsCardiomyopathy patients should adopt a low-sodium diet to reduce fluid retention and manage heart failure. A personalized exercise and rest plan helps maintain physical fitness without overstraining the heart. Avoiding alcohol and tobacco is essential to prevent further damage to...
Cardiomyopathy VII: Pre and Post Operative Nursing Management
Patients with hypertrophic cardiomyopathy (HCM) and left ventricular outflow tract (LVOT) obstruction who remain symptomatic despite optimal medical therapy may undergo a septal myectomy (Morrow procedure). This procedure involves excising a portion of the hypertrophied septum below the aortic valve using a heart-lung machine to improve blood flow through the LVOT. Effective preoperative and postoperative nursing management ensures successful patient outcomes, minimizes complications, and...

