シュプロヴェントリキュラ・タヒカルディアに関連した. 低心率または血管運動応答の表現ですか?

J W Leitch¹, G J Klein, R Yee

¹Department of Medicine, University of Western Ontario, London, Canada.

Circulation

|March 1, 1992

まとめ

超心室性短心症 (SVT) 中のは,血圧の変化と関連しており,より速い心拍数とは関係ありません. この発見は,高心率ではなく,血管運動要因が,SVT患者の昏睡の主な原因であることを示唆しています.

科学分野:

心臓病学心臓病学
電気生理学電気生理学
クリニカル・メディシン臨床医学

背景:

超静脈性短心症 (SVT) 中のは,急速短心率のマーカーと考えられています.
SVTにおける昏睡のメカニズムを理解することは,患者の管理に極めて重要です.

研究の目的:

SVTの患者におけるシンコープと低心拍の特徴の関係を調べる.
SVT中のシンコペがより速い心拍を予測するか,または血液動力学的変化に関連しているかどうかを判断するために.

主な方法:

様々なSVT型を患っている患者で,仰向けと直立 (60度頭上傾き) の姿勢で低心拍を誘導する.
イソプロテレノールとなしのシヌスリズムにおけるチルトテストの実施.
誘発性短動脈と傾きテストの際の短動脈サイクル長さと血圧変化の測定.

主要な成果:

タキカルディアのサイクル長さは短く,血圧はSVT中に直立状態でより顕著に低下しました.
垂直性低心拍中のは,平均血圧のより大きな低下と関連しており,低心拍のサイクル長さの短縮ではありませんでした.
SVT中にシンコープを経験した患者は,シヌスリズムにおける傾きテスト中にシンコープを患う可能性が高くなりました.

結論:

SVTにおける失眠は,主に血管運動の不安定性とそれに関連する血圧低下に関連しています.
SVT中のシンコープは,より速い心拍のペースを予測しません.
これらの発見は,SVTと血管回路反応の両方において,シンコペのための自律的調節を含む共通のメカニズムを示唆しています.

さらに関連する動画

05:48

Autonomic Function Following Concussion in Youth Athletes: An Exploration of Heart Rate Variability Using 24-hour Recording Methodology

Published on: September 21, 2018

08:12

Calculating Heart Rate Variability from ECG Data from Youth with Cerebral Palsy During Active Video Game Sessions

Published on: June 5, 2019

関連する概念動画

01:14

Decreased pulse rate

Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
There are specific risk factors that can elevate the likelihood of developing bradycardia. Advanced age is a significant factor, with bradycardia...

01:18

Disorders of the Autonomic Nervous System

The autonomic nervous system (ANS) is an intricate network of nerves that controls functions such as the regulation of heart rate, digestion, and blood pressure regulation. When this system malfunctions, it can lead to various disorders that affect multiple bodily functions. One common feature of many autonomic disorders is the involvement of smooth blood vessels, which play a crucial role in regulating blood flow throughout the body.
Raynaud's disease, also known as Raynaud's phenomenon, is a...

01:29

Disturbances in Heart Rhythm

Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...

01:31

Regulation of Heart Rates

The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
The SNS increases heart rate through the release of norepinephrine and epinephrine, which act on beta-1 adrenergic receptors in the heart. This action increases the rate of depolarization in the sinoatrial (SA) node, the heart's...

01:28

Dysrhythmias II: Classification of Tachyarrhythmias

Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...

01:29

Dysrhythmias III: Characteristics of Dysrhythmias

Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per minute.

関連する実験動画