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Related Concept Videos

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.
Narcolepsy01:07

Narcolepsy

Narcolepsy is a chronic sleep disorder characterized by pervasive, uncontrolled sleepiness and other sleep disturbances. One of its hallmark symptoms is an abrupt transition to REM sleep upon falling asleep, which causes symptoms typically associated with this phase to occur unexpectedly during wakefulness. These include the following symptoms, which typically last from a minute or two to half an hour.
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...
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)...
Transient Ischemic Attack l: Introduction01:26

Transient Ischemic Attack l: Introduction

A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...
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...

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Related Experiment Video

Updated: May 20, 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

Syncope.

Ángel Moya-I-Mitjans1, Nuria Rivas-Gándara, Axel Sarrias-Mercè

  • 1Unidad de Arritmias, Servicio de Cardiología, Hospital Universitario Vall d'Hebron, Universidad Autónoma de Barcelona, Barcelona, Spain. amoya@vhebron.net

Revista Espanola De Cardiologia (English Ed.)
|July 6, 2012
PubMed
Summary
This summary is machine-generated.

Syncope, a common condition of temporary consciousness loss, is often caused by reflex mechanisms. Cardiac syncope, though less common, poses a greater risk, especially in older adults.

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Area of Science:

  • Cardiology
  • Neurology

Background:

  • Syncope is a transient loss of consciousness due to global cerebral hypoperfusion.
  • Accurate definition differentiates syncope from conditions like epilepsy or falls.

Purpose of the Study:

  • To review the etiological classification of syncope.
  • To evaluate diagnostic tests and therapeutic options for syncope.
  • To emphasize the importance of specialized syncope units.

Main Methods:

  • Review of etiological classification of syncope.
  • Assessment of diagnostic tests including carotid sinus massage, tilt-table testing, and prolonged ECG monitoring.
  • Review of therapeutic strategies and the role of syncope units.

Main Results:

  • Reflex syncope is the most common cause with a good prognosis.
  • Cardiac syncope prevalence and risk increase with age.
  • Specific diagnostic strategies for bundle branch block and adenosine testing were reviewed.

Conclusions:

  • Reflex syncope is common and generally benign.
  • Cardiac syncope requires careful management due to poorer prognosis.
  • Specialized syncope units can improve diagnosis and resource allocation.