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Related Concept Videos

Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

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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...
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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...
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

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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...
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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...
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Decreased pulse rate01:14

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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.
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Alterations in Blood Pressure01:30

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Alterations in blood pressure, such as hypertension (high blood pressure) and hypotension (low blood pressure), significantly affect human health. Understanding these conditions' classifications, causes, and symptoms is essential for effective management and treatment.
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Updated: Apr 21, 2026

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
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[Postural orthostatic tachycardia syndrome].

Louise Brinth1, Kirsten Pors, Jesper Mehlsen

  • 1Koordinerende Forskningsenhed, Frederiksberg Hospital, Nordre Fasanvej 57, 2000 Frederiksberg. louisebrinth@live.dk.

Ugeskrift for Laeger
|October 29, 2014
PubMed
Summary

Postural Orthostatic Tachycardia Syndrome (POTS) is a complex condition causing rapid heart rate increases when standing. Diagnosis involves specific heart rate changes during a tilt test, with management focusing on lifestyle and medication.

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Area of Science:

  • Neurology
  • Cardiology
  • Immunology

Background:

  • Postural Orthostatic Tachycardia Syndrome (POTS) is a heterogeneous condition affecting the autonomic nervous system.
  • It is often associated with suspected autoimmune processes.
  • POTS is characterized by abnormal heart rate increases upon standing, leading to symptoms of reduced brain blood flow and sympathetic nervous system overactivity.

Purpose of the Study:

  • To summarize the key diagnostic criteria for POTS.
  • To outline the primary management strategies for POTS patients.

Main Methods:

  • Diagnostic criteria involve assessing heart rate response during a head-up tilt test.
  • Key metrics include an increase of ≥30 bpm or reaching >120 bpm.

Main Results:

  • The primary diagnostic marker for POTS is a significant heart rate increase upon assuming an upright posture.
  • This elevation is quantified during a standardized head-up tilt test.

Conclusions:

  • POTS diagnosis relies on specific heart rate criteria during tilt table testing.
  • Effective management combines non-pharmacological approaches like stress reduction and hydration with pharmacological interventions for heart rate control.