在严重不补偿的肺高血压中,肺毛细血管中的血小板积聚
Camille Miard1, Vincent Thomas de Montpreville2, Jean-François Bernaudin2,3,4
1Cardiothoracic Intensive Care Unit, Hospital Marie Lannelongue, Le Plessis-Robinson, France.
Thorax
|October 7, 2024
概括
肺部的血小板聚合可能会在急性肺高血压 (PH) 失补偿期间导致血小板减少 (血小板数量低). 这项研究发现,低血小板的PH患者肺部血小板总量显著增加.
科学领域:
- 心血管医学 心血管医学
- 肺部医学 肺部医学
- 血液学 血液学 血液学
背景情况:
- 血小板数量较低的状况 - - 血小板缺血 - - 在肺高血压 (PH) 的急性失补偿期间观察到.
- 在这种情况下,导致血小板缺血的潜在机制尚未完全理解.
- 肺血管中的血小板聚合是潜在的促成因素.
研究的目的:
- 为了调查肺组织中血小板聚合物的存在和程度,从经历急性肺高血压脱补偿的患者.
- 确定血小板聚合是否与这些患者血小板缺血的严重程度相关.
主要方法:
- 分析了16名肺移植患者的肺部组织,这些患者患有急性PH脱补偿,根据血小板缩的存在或不存在来分类.
- 免疫组织化学被用来识别和量化血小板聚合物.
- 使用扫描电子显微镜 (SEM) 可视化血小板聚合物形态和肺毛细血管内的分布.
- 与来自没有PH或血小板狭窄症的个体的7个对照肺部样本进行比较.
主要成果:
- 与对照组相比,患有急性PH失补偿和血小板缺血的患者的血小板总数中位数显著增加 (147.5与19.4).
- 扫描电子显微镜显示,受影响患者的毛细血管大量充满了血小板聚合物.
- 血小板总量的显著增加观察到与PH脱补偿但血小板数量正常的患者相比,患有血小板缩的患者.
结论:
- 肺血管中的血小板聚合是急性肺高血压脱补偿和并发性血小板狭窄症患者的重要发现.
- 这些发现表明,肺部的血管内血小板聚合可能是促进PH脱补偿期间血小板缺血发展的关键机制.
相关概念视频
Formation of the Platelet Plug
5.1K
The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
5.1K
Pulmonary Embolism II: Diagnostic Studies and Interprofessional Care
3
Diagnosing Pulmonary EmbolismDiagnosing pulmonary embolism (PE) involves clinical assessment and advanced imaging tests. The preferred diagnostic tool is the spiral (helical) CT scan or CT angiography (CTA), which uses intravenous contrast media to visualize the pulmonary vasculature and identify emboli.A ventilation-perfusion (V/Q) scan is an alternative for patients unable to receive contrast media. This scan includes both perfusion and ventilation scanning. Perfusion scanning involves...
3
Pulmonary Embolism I: Introduction
2
Pulmonary embolism (PE) occurs when a thrombus, fat or air embolus, amniotic fluid, or tumor tissue blocks one or more pulmonary arteries. These blockages originate in the venous system or the right side of the heart.EtiologyPE primarily arises from deep vein thrombosis (DVT) and other hypercoagulable states, such as inherited thrombophilias. Additional etiological factors include venous stasis, commonly seen in obesity, and endothelial injury from surgery and trauma. Less common causes include...
2
Pulmonary Hypertension: Classification and Pathogenesis
152
Pulmonary hypertension (PH) is a severe health condition in which the mean pulmonary arterial pressure increases to 25 mmHg or more, even when the body is at rest. This high pressure in the blood vessels that transport blood from the heart to the lungs can cause various symptoms, including shortness of breath, can lead to right heart failure, and significantly affect the overall quality of life.
There are various classifications for PH, each relating to different underlying causes and also...
There are various classifications for PH, each relating to different underlying causes and also...
152
Treatment for Pulmonary Arterial Hypertension: Prostacyclin Receptor Agonists
155
Prostacyclin receptor agonists are a class of therapeutic agents integral to managing pulmonary arterial hypertension (PAH). These drugs operate by mimicking the action of prostaglandin I2, or PGI2, a naturally occurring compound in the body.
These agonists bind to the IPR receptor situated on the plasma membrane of the pulmonary artery smooth muscle cells. This binding triggers a cascade of reactions known as the GS-AC-cAMP-PKA pathway. This pathway results in the relaxation of smooth muscle...
These agonists bind to the IPR receptor situated on the plasma membrane of the pulmonary artery smooth muscle cells. This binding triggers a cascade of reactions known as the GS-AC-cAMP-PKA pathway. This pathway results in the relaxation of smooth muscle...
155
Structure and Function of Platelets
1.0K
The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000...
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000...
1.0K


