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関連する概念動画

Bode Plots Construction01:24

Bode Plots Construction

The Bode plot is an essential tool in control system analysis, mapping the frequency response of a system through a magnitude plot and a phase plot, both against a logarithmic frequency axis. To construct a Bode plot, consider the transfer function H(ω):
Electrocardiogram01:29

Electrocardiogram

An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
Heart Sounds01:15

Heart Sounds

Heart sounds are generated by the turbulence in blood flow due to the closing of heart valves. These sounds are best perceived slightly away from the valves, where the blood flow disseminates the sound.
Auscultation is the process of listening to these internal body sounds using a stethoscope. The heart produces four types of sounds, but only two—S1 and S2—can usually be heard with a stethoscope.
S1, also known as the "lub" sound, is caused by the closure of atrioventricular (A-V) valves at the...
Gastric Emptying01:16

Gastric Emptying

Gastric emptying occurs when the stomach gradually releases chyme into the duodenum. When the stomach is distended, it triggers the release of gastrin, a hormone that promotes gastric acid secretion to aid in digestion. Additionally, stomach distension contributes to peristaltic waves that propel gastric contents toward the pyloric region. The gastroenteric reflex, on the other hand, primarily stimulates peristalsis in the intestines, facilitating the movement of contents further along the...

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関連する実験動画

Updated: Jul 6, 2026

MRI Mapping of Cerebrovascular Reactivity via Gas Inhalation Challenges
09:33

MRI Mapping of Cerebrovascular Reactivity via Gas Inhalation Challenges

Published on: December 17, 2014

食道エコーカルディオグラフィー

L Frazin, J V Talano, L Stephanides

    Circulation
    |July 1, 1976
    PubMed
    まとめ
    この要約は機械生成です。

    食道エコーカルディオグラフィは,慢性閉塞性肺疾患 (COPD) の患者の心臓イメージングのための安全で高解像度の診断方法を提供します. このテクニックは,従来の心声エコーグラフィーと比較して優れた画像品質を提供し,正確な心臓の評価に役立ちます.

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    Last Updated: Jul 6, 2026

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    09:33

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    Published on: December 17, 2014

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    科学分野:

    • 心臓病学 心臓病学
    • メディカルイマージング (医学イメージング)
    • 肺内科 肺内科 肺内科

    背景:

    • 慢性阻害性肺疾患 (COPD) は,心臓のイメージングに課題を提示しています.
    • 食道エコーカルディオグラフィは,高解像度の心臓視覚化を提供する専門技術です.

    研究 の 目的:

    • COPD患者における食道エコーカルディオグラフィの安全性と診断的有用性を評価する.
    • エソファゲスの画像品質と測定相関を,従来の前頭回声心臓撮影と比較するために.

    主な方法:

    • 消化管と前頭回響図は,COPDの38人の被験者に実施されました.
    • エコーの診断品質と測定値の相関性が評価されました.

    主要な成果:

    • 消化管エコーカルディオグラフィは,38人の被験者全員で診断品質の画像を生成しました.
    • 前回性エコーカルディオグラフィは,わずか18人の被験者に診断品質の画像を提供しました.
    • 測定結果は,大動脈弁の直径,左心房の直径,ミトラ弁のEF傾きに対して良好な相関関係を示し,大動脈根の直径については相関関係が弱かった.

    結論:

    • 消化管エコーカルディオグラフィは,COPD患者における心臓の評価のための安全で効果的な診断手順です.
    • 従来の前頭エコーカルディオグラフィと比較して,優れた画像品質と信頼性の高い測定を提供します.