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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...
Mitral Valve Prolapse II: Assessment and Management01:22

Mitral Valve Prolapse II: Assessment and Management

IntroductionA range of clinical features characterizes Mitral Valve Prolapse (MVP), but it is important to note that many individuals with MVP are asymptomatic and may remain so throughout their lives. For those who do exhibit symptoms, the following are the key clinical features:Palpitations: This is a common symptom where individuals feel an irregular or rapid heartbeat. Palpitations in MVP are often due to arrhythmias such as premature ventricular contractions or supraventricular tachycardia.
Dysrhythmias VII: Nursing Management of Dysrhythmias01:25

Dysrhythmias VII: Nursing Management of Dysrhythmias

Nursing management of dysrhythmias involves the following:AssessmentSubjective Assessment:The initial step involves gathering patient-reported symptoms such as dizziness, palpitations, and chest discomfort. It is crucial to collect a detailed history, including previous heart conditions, current medication use, and lifestyle factors like caffeine and alcohol consumption.Objective Assessment:This involves observing clinical signs such as jugular venous distention, cool and pale skin, and...

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Related Experiment Video

Updated: Jun 25, 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

Postural tachycardia syndrome (POTS).

Phillip A Low1, Paola Sandroni, Michael Joyner

  • 1Department of Neurology, Mayo Clinic, Rochester, Minnesota 55905, USA.

Journal of Cardiovascular Electrophysiology
|February 12, 2009
PubMed
Summary
This summary is machine-generated.

Postural Orthostatic Tachycardia Syndrome (POTS) involves symptoms of orthostatic intolerance due to increased heart rate without hypotension. Management includes lifestyle changes and medication for most patients.

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Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine
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Last Updated: Jun 25, 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

Area of Science:

  • Cardiology
  • Neurology
  • Autonomic Dysfunction

Background:

  • Postural Orthostatic Tachycardia Syndrome (POTS) is characterized by orthostatic symptoms and a significant heart rate increase without hypotension.
  • Symptoms stem from reduced brain blood flow and excessive sympathetic nervous system activity.

Purpose of the Study:

  • To review the diagnosis, pathophysiology, and management of POTS.
  • To provide insights based on Mayo Clinic research.

Main Methods:

  • Review of existing literature and clinical work from the Mayo Clinic.
  • Focused history and physical examination.
  • Diagnostic tests including tilt table testing (HUT), volume status assessment, and evaluation for denervation and hyperadrenergic states.

Main Results:

  • POTS predominantly affects females (5:1 ratio), with onset typically in adulthood (mean age ~30 years).
  • Key mechanisms include peripheral denervation, hypovolemia, venous pooling, beta-receptor supersensitivity, and impaired brain stem regulation.
  • Deconditioning, somatic hypervigilance, and psychologic factors can exacerbate symptoms.

Conclusions:

  • POTS is a heterogeneous condition with varied presentations and underlying mechanisms.
  • Major contributing factors include denervation, hypovolemia, deconditioning, and hyperadrenergic states.
  • A pathophysiology-based management approach, including diet, fluids, training, and medication, benefits most patients.