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Related Concept Videos

Exercise Stress Test01:26

Exercise Stress Test

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Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
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Reflex Activity01:08

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A reflex activity is an automatic, involuntary response to specific stimuli. It is a part of our survival mechanism, designed to protect us from potential harm. For example, when a bright light suddenly shines into our eyes, we instinctively close them or look away. This is a simple reflex activity orchestrated by the nervous system without conscious thought or effort.
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Dysrhythmias V: Evaluating Dysrhythmias01:30

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Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
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Autonomic Nervous System01:22

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The autonomic nervous system (ANS) is a critical component of the peripheral nervous system, primarily responsible for regulating involuntary bodily functions and maintaining homeostasis. It functions in tandem with the central nervous system (CNS) to seamlessly coordinate various physiological processes without the need for conscious control.
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Pulse rhythm01:30

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Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
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Updated: Apr 8, 2026

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
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Autonomic function testing: an important diagnostic test for patients with syncope.

Pearl K Jones1, Christopher H Gibbons2

  • 1Department of Neurology, UT Health Science Center San Antonio, San Antonio, Texas, USA.

Practical Neurology
|June 26, 2015
PubMed
Summary
This summary is machine-generated.

Syncope evaluation can be challenging. Autonomic function testing safely assesses the nervous system to diagnose conditions like orthostatic hypotension and guide treatment.

Keywords:
AUTONOMIC

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Quantitative Autonomic Testing
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Area of Science:

  • Cardiology
  • Neurology
  • Autonomic Medicine

Background:

  • Syncope is a frequent clinical issue with a broad differential diagnosis.
  • Initial patient history and physical exams offer diagnostic clues but may necessitate further investigation.
  • Identifying the precise cause of syncope is crucial for effective management.

Purpose of the Study:

  • To evaluate the utility of autonomic function testing in diagnosing the cause of syncope.
  • To assess the role of autonomic testing in evaluating parasympathetic and sympathetic nervous system function in patients with syncope.
  • To determine if autonomic testing aids in risk stratification and treatment decisions for recurrent syncope.

Main Methods:

  • Autonomic function testing was employed as a diagnostic tool.
  • The testing assessed the integrity of the parasympathetic and sympathetic nervous systems.
  • Evaluation included patients with unexplained syncope.

Main Results:

  • Autonomic function testing is a safe method for further syncope evaluation.
  • The testing can help diagnose conditions such as orthostatic hypotension, delayed orthostatic hypotension, postural tachycardia syndrome, and neurally mediated syncope.
  • Results aid in understanding autonomic nervous system function in affected individuals.

Conclusions:

  • Autonomic function testing is valuable when the cause of syncope remains unclear after initial assessment.
  • This testing aids in diagnosing specific autonomic disorders contributing to syncope.
  • Autonomic testing assists in risk stratification and informs treatment strategies for syncope management.