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Related Concept Videos

Disorders of the Autonomic Nervous System01:18

Disorders of the Autonomic Nervous System

The autonomic nervous system (ANS) is an intricate network of nerves that controls functions such as the regulation of heart rate, digestion, and blood pressure regulation. When this system malfunctions, it can lead to various disorders that affect multiple bodily functions. One common feature of many autonomic disorders is the involvement of smooth blood vessels, which play a crucial role in regulating blood flow throughout the body.
Raynaud's disease, also known as Raynaud's phenomenon, is a...
Pathophysiology of Heart Failure01:17

Pathophysiology of Heart Failure

Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
Acute Respiratory Failure-III01:30

Acute Respiratory Failure-III

Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without causing...
Acute Respiratory Failure-I01:21

Acute Respiratory Failure-I

Acute respiratory failure is a condition characterized by the inability of the lungs to perform their primary function: gas exchange. This failure leads to insufficient oxygen levels (hypoxemia) in the blood, elevated carbon dioxide levels (hypercapnia), or both, causing critical impairment in organ function.
Definition: It is defined by specific criteria based on blood gas measurements. Hypoxemia happens when the partial pressure of oxygen (PaO2) falls below 60 mmHg. At the same time,...
Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...

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Related Experiment Video

Updated: May 7, 2026

Quantitative Autonomic Testing
11:40

Quantitative Autonomic Testing

Published on: July 19, 2011

Pure autonomic failure.

Emily M Garland1, William B Hooper, David Robertson

  • 1Autonomic Dysfunction Center, Vanderbilt University, Nashville, TN, USA.

Handbook of Clinical Neurology
|October 8, 2013
PubMed
Summary
This summary is machine-generated.

Pure autonomic failure (PAF), multiple system atrophy (MSA), and Parkinson's disease (PD) are α-synucleinopathies causing orthostatic hypotension. Differentiating these conditions aids treatment and understanding neurodegeneration progression.

Keywords:
Parkinson’s diseasePure autonomic failureautonomiccardiac sympathetic innervationmultiple system atrophynorepinephrineorthostatic hypotensionreceptor hypersensitivitysupine hypertension

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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

Related Experiment Videos

Last Updated: May 7, 2026

Quantitative Autonomic Testing
11:40

Quantitative Autonomic Testing

Published on: July 19, 2011

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:

  • Neuroscience
  • Autonomic Neurology
  • Pathology

Background:

  • Orthostatic hypotension with a low, steady heart rate was first described in 1925.
  • Pure autonomic failure (PAF), multiple system atrophy (MSA), and Parkinson's disease (PD) are distinct α-synucleinopathies.
  • These conditions present with autonomic dysfunction, differing in central vs. peripheral nervous system involvement and α-synuclein deposit locations.

Purpose of the Study:

  • To review the clinical features and diagnostic approaches for differentiating PAF, MSA, and PD with autonomic failure.
  • To highlight the role of α-synuclein in the pathogenesis of these disorders.
  • To discuss current treatment strategies and future research directions.

Main Methods:

  • Review of existing literature on orthostatic hypotension and α-synucleinopathies.
  • Comparison of clinical, biochemical, functional, and imaging characteristics of PAF, MSA, and PD.
  • Analysis of α-synuclein deposition patterns in different disorders.

Main Results:

  • PAF involves peripheral autonomic dysfunction, MSA has central Parkinsonian features, and PD affects postganglionic neurons.
  • α-synuclein deposits differ: glial in MSA, Lewy bodies in PAF and PD.
  • Cardiac sympathetic innervation is typically preserved in MSA but reduced in PAF and PD with autonomic failure.

Conclusions:

  • Differentiating between PAF, MSA, and PD with autonomic failure is crucial for appropriate management.
  • Understanding the progression from peripheral to central neurodegeneration in PAF is a key area for future research.
  • Further investigation into the factors driving neurodegeneration is needed.