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相关概念视频

Pulse amplitude and quality01:17

Pulse amplitude and quality

Pulse amplitude is a crucial indicator of cardiac health because it provides valuable insights into the strength of left ventricular contractions and the overall uniformity of blood circulation within the vasculature. The strength of the pulse is directly related to the force with which the heart contracts and the volume of blood being pumped.
A weak or absent pulse may indicate reduced cardiac output or poor left ventricular contraction, which can be signs of cardiovascular dysfunction or...
Assessment of apical pulse01:17

Assessment of apical pulse

Assessing the Apical Pulse
Assessing the apical pulse is a critical nursing procedure, particularly indicated for:
Assessment of the Cardiovascular System III: Palpation01:27

Assessment of the Cardiovascular System III: Palpation

Palpation involves feeling the body to evaluate texture, size, consistency, and tenderness for assessing cardiovascular health. The following steps are organized in a head-to-toe order:
Jugular Venous Pressure (JVP) Measurement
Position the patient at a thirty- to forty-five-degree angle or in a semi-fowler's position. Look for the highest point of pulsation in the internal jugular vein and measure the vertical distance to the angle of Loius or sternal angle. A normal JVP is 3-4 cm above the...
Assessment of the Cardiovascular System IV: Auscultation01:25

Assessment of the Cardiovascular System IV: Auscultation

Cardiac auscultation is a clinical skill used to assess heart function and detect abnormalities. It involves listening to heart sounds at specific anatomical locations through a stethoscope.
Normal Heart Sounds
S1 (First Heart Sound)-
S1 is made by the closure of the mitral and tricuspid valves (atrioventricular valves), marking the beginning of systole.
S2 (Second Heart Sound)-
S2 is made by the closure of the aortic and pulmonic valves (semilunar valves), marking the end of the systole.
Cardiovascular System Abnormal Findings II: Auscultation01:25

Cardiovascular System Abnormal Findings II: Auscultation

Auscultation, an essential part of a heart examination, is done using a stethoscope. It provides crucial information about heart function and possible heart problems. Due to heart problems, abnormal sounds can be heard during systole or diastole. These sounds include S3 and S4 gallops, opening snaps, systolic clicks, and murmurs.
Abnormal Heart Sounds
Gallops:
Aortic Regurgitation II: Clinical Features and Diagnostic Tests01:22

Aortic Regurgitation II: Clinical Features and Diagnostic Tests

Aortic valve regurgitation (AR) occurs when the aortic valve fails to close properly, allowing blood to flow backward from the aorta into the left ventricle. This backflow can result in two distinct clinical presentations: acute and chronic AR, each characterized by its own set of symptoms and physical findings.Acute Aortic RegurgitationAcute AR presents with a sudden onset of severe symptoms. Patients typically experience profound dyspnea (shortness of breath), chest pain, and signs of left...

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相关实验视频

Updated: Jul 9, 2026

Noninvasive Determination of Vortex Formation Time Using Transesophageal Echocardiography During Cardiac Surgery
04:48

Noninvasive Determination of Vortex Formation Time Using Transesophageal Echocardiography During Cardiac Surgery

Published on: November 28, 2018

在评估主动脉狭窄的严重程度时,顶端A波与第四心脏声音相比.

M A Kavalier, J Stewart, M E Tavel

    Circulation
    |February 1, 1975
    PubMed
    概括

    顶心电图的"a"波高度可以表明40岁以上的成年人患有临界大动脉狭窄. 超过16%的"a"波表明严重的狭窄,在其他迹象不清楚时有助于诊断.

    科学领域:

    • 心脏病学 心脏病学
    • 诊断医学 诊断医学
    • 生物医学工程 生物医学工程

    背景情况:

    • 大动脉狭窄是一种显著的膜心脏病.
    • 精确诊断关键大动脉狭窄症对于及时干预至关重要.
    • 评估狭窄症严重程度的非侵入性标记是有价值的.

    研究的目的:

    • 为了评估顶心电图的"a"波高度作为临界大动脉狭窄的诊断标记.
    • 为了将"a"波高度与大动脉狭窄的导管检测严重程度相关联.
    • 在这种情况下,评估第四心声马 (S4G) 的实用性.

    主要方法:

    • 在72名患有大动脉狭窄的患者和14名对照患者 (所有年龄>40岁) 上进行了顶心图和心声图.
    • 关键性大动脉狭窄被定义为大动脉面积小于0.75厘米-2.
    • "a"波的高度被测量为e到o外行的百分比 (a/e-o).

    主要成果:

    • 超过16%的a/e-o在45%的临界大动脉狭窄患者中被观察到.
    • 所有正常对照组和不那么严重的狭窄症患者的A/E-O <16%.
    • S4G的可听性与"a"波高度或狭窄症严重程度没有一致的关系.

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    09:32

    Continuous Venous-Arterial Doppler Ultrasound During a Preload Challenge

    Published on: January 20, 2023

    结论:

    • 一个可触摸的顶端"a"波或一个心脏图顶 a/e-o>16% 是严重的大动脉狭窄的显著指标.
    • 没有升高的"a"波并不排除严重的大动脉狭窄.
    • 在这项研究中,S4G的可听性不是可靠的指标,尽管它可能需要进一步调查.