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Related Concept Videos

Alterations in Blood Pressure01:30

Alterations in Blood Pressure

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.
Hypertension (High blood pressure)
Hypertension occurs when blood pressure readings consistently exceed the normal range. It is diagnosed when systolic blood pressure (the top number, indicating pressure while the heart beats)...
Blood Pressure Imbalances and Circulatory Shock01:24

Blood Pressure Imbalances and Circulatory Shock

Disorders affecting blood volume, vascular tone, or vascular function can disrupt vascular homeostasis, including conditions like hypertension, hemorrhage, and shock.
Blood Pressure: Hypertension and Hypotension
Normal blood pressure is 120/80 mm Hg. Elevated blood pressure is 120-129/under 80 mm Hg. Hypertension, warranting treatment at 130/80 mm Hg, is often asymptomatic and can lead to severe cardiovascular events, aneurysms, peripheral arterial disease, chronic renal disease, or cardiac...
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...
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...
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...
Measurement of Blood Pressure01:17

Measurement of Blood Pressure

Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a stethoscope.

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Related Experiment Video

Updated: Jun 15, 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

Orthostatic syndromes differ in syncope frequency.

Ajitesh Ojha1, Kevin McNeeley, Elizabeth Heller

  • 1Neurologic Institute, University Hospitals Case Medical Center, Cleveland, Ohio 44106, USA.

The American Journal of Medicine
|March 3, 2010
PubMed
Summary
This summary is machine-generated.

Patients with postural tachycardia syndrome (POTS) experience syncope more frequently than those with orthostatic hypotension. This suggests POTS may increase syncope risk due to baroreceptor system differences.

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Quantitative Autonomic Testing
11:40

Quantitative Autonomic Testing

Published on: July 19, 2011

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Last Updated: Jun 15, 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

Quantitative Autonomic Testing
11:40

Quantitative Autonomic Testing

Published on: July 19, 2011

Area of Science:

  • Autonomic Nervous System Disorders
  • Cardiovascular Physiology
  • Neurology

Background:

  • Conflicting evidence exists regarding the link between postural tachycardia syndrome (POTS) and syncope.
  • This study investigates the comparative frequency of syncope in POTS versus orthostatic hypotension (OH).

Purpose of the Study:

  • To compare the incidence of syncope in patients diagnosed with POTS versus OH.
  • To elucidate the relationship between syncope and POTS, considering potential baroreceptor system involvement.

Main Methods:

  • Database query of 3700 patients from an autonomic laboratory.
  • Standardized definitions for POTS and OH, with POTS requiring orthostatic symptoms and heart rate increase beyond 10 minutes.
  • Syncope defined as abrupt blood pressure/heart rate decrease during tilt study; statistical analysis using Fisher's exact and Student's t tests.

Main Results:

  • Of 810 referred patients, 185 had POTS and 328 had OH.
  • Syncope occurred in 38% of POTS patients versus 22% of OH patients (P<.0001).
  • In POTS, syncope on tilt strongly correlated with clinical syncope history (90%); this correlation was absent in OH (41% vs 36%, P=.49).

Conclusions:

  • Syncope is significantly more common in patients with POTS than OH.
  • Clinical awareness of high syncope risk in POTS is warranted.
  • The low-pressure baroreceptor system in POTS may lead to greater syncope susceptibility compared to OH.