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Related Concept Videos

Dysrhythmias II: Classification of Tachyarrhythmias01:28

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...
Increased pulse rate01:17

Increased pulse rate

Tachycardia is a condition marked by an abnormally fast or irregular heart rate, surpassing the typical resting rate. In adults, tachycardia is characterized by a pulse rate ranging from 100 to 180 beats per minute. The increased heart rate can result in inadequate blood flow to various body parts, ultimately diminishing the oxygen supply to organs and tissues.
Many factors can elevate the risk of developing tachycardia. These include advanced age, a family history of arrhythmias, and an...
Dysrhythmias III: Characteristics of Dysrhythmias01:29

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.
Decreased pulse rate01:14

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...
Disorders of the Autonomic Nervous System01:18

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...
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...

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Can standing replace upright tilt table testing in the diagnosis of postural tachycardia syndrome (POTS) in the young?

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Related Experiment Video

Updated: Jul 16, 2026

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
14:09

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance

Published on: March 21, 2013

The postural tachycardia syndrome.

Marvin S Medow1, Julian M Stewart

  • 1Department of Pediatrics, New York Medical College, Valhalla, New York 10598, USA. Marvin_Medow@nymc.edu

Cardiology in Review
|February 17, 2007
PubMed
Summary

Postural tachycardia syndrome (POTS) causes orthostatic intolerance and rapid heart rate increases. Treatments aim to alleviate hypovolemia and circulatory issues, with varying success rates.

Area of Science:

  • Cardiology
  • Neurology
  • Internal Medicine

Background:

  • Postural tachycardia syndrome (POTS) is characterized by orthostatic intolerance and excessive tachycardia.
  • POTS affects daily activities and is increasingly diagnosed in females aged 15-50.
  • While adults with POTS typically do not experience hypotension, children may.

Purpose of the Study:

  • To explore the etiology and clinical presentation of POTS.
  • To differentiate POTS from other conditions causing similar symptoms.
  • To review current therapeutic strategies for managing POTS.

Main Methods:

  • Review of existing literature on POTS.
  • Analysis of clinical findings and diagnostic criteria for POTS.
  • Examination of treatment approaches for POTS and orthostatic intolerance.

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Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine
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Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine

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Computerized Dynamic Posturography for Postural Control Assessment in Patients with Intermittent Claudication
14:52

Computerized Dynamic Posturography for Postural Control Assessment in Patients with Intermittent Claudication

Published on: December 11, 2013

Related Experiment Videos

Last Updated: Jul 16, 2026

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
14:09

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance

Published on: March 21, 2013

Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine
10:08

Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine

Published on: February 17, 2018

Computerized Dynamic Posturography for Postural Control Assessment in Patients with Intermittent Claudication
14:52

Computerized Dynamic Posturography for Postural Control Assessment in Patients with Intermittent Claudication

Published on: December 11, 2013

Main Results:

  • POTS is defined by a significant heart rate increase within 10 minutes of standing.
  • Central hypovolemia is a potential underlying cause for POTS and other forms of orthostatic intolerance.
  • Idiopathic POTS requires differentiation from conditions like dehydration, anemia, and hyperthyroidism.

Conclusions:

  • Therapies for POTS focus on addressing central hypovolemia and circulatory dysfunction.
  • Current treatments for POTS show variable success and are often combined.
  • Further research is needed to understand the unknown etiology of POTS.