在高血压心脏中,早期卵巢切除诱导的适应的综合性心血管研究
Bruno Augusto Aguilar1, Lucas Ferreira Dalvit1, Joao Vitor Martins Bernal1
1Department of Health Sciences, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
American journal of physiology. Heart and circulatory physiology
|August 18, 2025
概括
卵巢激素缺乏会使高血压大鼠的心脏功能恶化,损害收缩能力并增加纤维化. 这突显了荷尔蒙状况对心脏健康的影响,特别是高血压.
科学领域:
- 心血管生理学心血管生理学
- 内分泌学 在内分泌学.
- 高血压研究 高血压研究
背景情况:
- 卵巢激素缺乏可能会使高血压引起的心脏功能障碍恶化.
- 对左心室收缩能力的具体影响尚不清楚.
研究的目的:
- 研究卵巢切除术对高血压大鼠 (SHR) 的血液动力学,心脏形态和功能的影响,与正常血压对照 (WKY) 相比.
- 用隔离心脏来评估对左心室收缩性的影响.
主要方法:
- 在SHR和WKY大鼠身上进行了卵巢切除或SHAM手术.
- 血液动力学,心脏形态学和功能通过尾部整体图,心声图,兰根多夫技术和组织学进行评估.
- 手术后16周进行了评估.
主要成果:
- 卵巢切除增加了身体和心脏质量;SHR显示身体质量减少和血压升高.
- 活体分析显示,SHR中隔膜厚度增加和射出/缩短分数减少;卵巢切除影响了心率和中风体积.
- 活体研究显示,SHR和卵巢切除的老鼠的收缩能力受损 (dP/dTmax/min降低),两组老鼠的纤维化增加.
结论:
- 早期的卵巢激素缺乏在正常血压和高血压的老鼠中显著损害了心脏形态和功能.
- 在隔离心脏中观察到最明显的功能缺陷,强调了荷尔蒙状况在心脏健康中的关键作用,特别是在高血压条件下.
相关概念视频
Hormonal Regulation of Blood Pressure
3.1K
Endocrinal or hormonal intervention in the cardiovascular system is predominantly exerted by the catecholamines - epinephrine and norepinephrine, as well as a slew of hormones that interact with renal function to modulate blood volume.
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction...
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction...
3.1K
Hypertension II: Pathophysiology
77
Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
77
Blood Studies for Cardiovascular System I: Cardiac Biomarkers
334
Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
334
Regulation of the Cardiovascular System
1.8K
The regulation of the cardiovascular system allows the body to adapt to various demands and maintain homeostasis.
The regulation of the cardiovascular system involves the autonomic nervous system (ANS), baroreceptors, and chemoreceptors, ensuring that heart rate and blood pressure are appropriately modulated in response to varying physiological demands.
The ANS comprises two main divisions: the sympathetic and parasympathetic nervous systems. The sympathetic nervous system enhances...
The regulation of the cardiovascular system involves the autonomic nervous system (ANS), baroreceptors, and chemoreceptors, ensuring that heart rate and blood pressure are appropriately modulated in response to varying physiological demands.
The ANS comprises two main divisions: the sympathetic and parasympathetic nervous systems. The sympathetic nervous system enhances...
1.8K
Hypertension and Regulation of Blood Pressure
3.1K
Hypertension, the most common cardiovascular disease, is diagnosed through repeated measurements of elevated blood pressure. Its risks, including damage to the kidney, heart, and brain, are directly proportional to blood pressure levels. Starting from 115/75 mm Hg, the risk of cardiovascular disease doubles with each increment of 20/10 mm Hg. The diagnosis relies on blood pressure measurements, not on patient symptoms, as hypertension is often asymptomatic until end-organ damage is imminent or...
3.1K
Hypertension III: Clinical Manifestations and Diagnostic Studies
48
Hypertension is asymptomatic and also referred to as the "silent killer" until it progresses to a severe stage or causes target organ disease. Patients may experience symptoms stemming from the strain on blood vessels and tissues in various organs or the heart's increased workload.Physical exams might show no abnormalities other than high blood pressure. Signs of vascular damage, when present, correspond to the organs supplied by the affected vessels, leading to target organ damage. For...
48


