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相关概念视频

Mitral Stenosis I: Introduction01:22

Mitral Stenosis I: Introduction

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Mitral Valve Stenosis (MVS) is a heart condition where the mitral valve narrows, impeding blood circulation from the left atrium to the left ventricle. The etiology and pathophysiology of this condition are multifaceted, leading to a cascade of cardiovascular complications.Causes of Mitral Valve StenosisRheumatic Heart Disease: It is the main cause of mitral valve stenosis, particularly in developing nations. This condition arises from rheumatic fever, an inflammatory illness resulting from...
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Regulation of Stroke Volume01:27

Regulation of Stroke Volume

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The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
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Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

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Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
1.0K
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

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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...
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Acute Coronary Syndrome III: Diagnostic Studies01:30

Acute Coronary Syndrome III: Diagnostic Studies

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Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
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Mitral Regurgitation I: Introduction01:20

Mitral Regurgitation I: Introduction

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Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
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急性缺血性中风与左心室缩功能障碍之间的关系

M Saiduzzaman1, S Dey, M Bhattacharjee

  • 1Dr Md Saiduzzaman, Medical Officer, Department of Neurology, Mymensingh Medical College Hospital (MMCH), Mymensingh, Bangladesh;

Mymensingh medical journal : MMJ
|October 1, 2023
PubMed
概括
此摘要是机器生成的。

轻度至中度的左心室缩功能障碍 (LVSD) 增加了急性缺血性中风的风险. 在中风患者中,较低的LVEF与更严重的神经缺陷相关,突出显示LVSD是中风发展和严重性的关键因素.

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科学领域:

  • 心脏病学 心脏病学
  • 神经学 神经学
  • 公共卫生 公共卫生

背景情况:

  • 在全球范围内,中风是导致死亡和残疾的主要原因,缺血性中风占病例的80-85%.
  • 虽然明显的心力衰竭预示着不良结果,但轻度至中度的左心室缩功能障碍 (LVSD) 与急性缺血性中风 (AIS) 风险之间的联系仍未得到充分研究.
  • 了解LVSD和AIS之间的关联对于改善中风预防和管理策略至关重要.

研究的目的:

  • 调查LVSD与AIS发生之间的关系.
  • 评估LVSD与AIS患者神经缺陷严重程度之间的关联.
  • 为了确定轻度至中度的LVSD是否是AIS的独立风险因素.

主要方法:

  • 一项病例控制研究涉及120名首次患有AIS的患者和120名年龄/性别匹配的健康对照.
  • 评估左心室 (LV) 缩功能,使用胸前两维心声谱来确定左心室喷射率 (LVEF).
  • 使用美国国立卫生研究院中风严重程度尺度 (NIHSS) 测量中风严重程度.

主要成果:

  • 与对照组相比,LVSD在AIS患者 (23.3%) 的患病率显著更高 (5.8%,p<0.001).
  • 轻度和中度的LVSD与AIS的几率明显更高 (OR分别为3.48和9.74).
  • 在对其他风险因素进行调整后,LVSD仍然是AIS的独立风险因素 (OR 2.7462,p=0.0435).
  • NIHSS得分显示,与LVEF的显著负相关性 (r=-0.443,p<0.001),表明较低LVEF的神经缺陷较大.

结论:

  • 轻度至中度的LVSD与急性缺血性中风的风险增加显著相关.
  • 对于AIS来说,LVSD是一个独立的风险因素,即使考虑到其他常见的风险因素.
  • 在AIS患者中,较低的LVEF与更严重的神经缺陷相关,强调心脏功能障碍对中风结果的影响.