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Related Concept Videos

Disorders of the Autonomic Nervous System01:18

Disorders of the Autonomic Nervous System

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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.
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The human nervous system is divided into two main parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS is composed of the brain and spinal cord, while the PNS contains nerve cells, clusters of nerve cells, and the sensory receptors that are outside the CNS. The PNS has two types of nerve cells: sensory (afferent) and motor (efferent). Sensory cells send signals to the CNS from receptors, and motor cells carry signals from the CNS to organs, muscles, and...
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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...
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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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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.
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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...
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Quantitative Autonomic Testing
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An overview on pure autonomic failure.

A Pavy-Le Traon1, A Foubert-Samier2, M Fabbri3

  • 1Neurology department, French reference center for Multiple System Atrophy, CHU de Toulouse, Toulouse, France; I2MC Institute-Inserm U1297, Toulouse, France.

Revue Neurologique
|December 21, 2023
PubMed
Summary

Pure autonomic failure (PAF) is a neurodegenerative disease causing orthostatic hypotension and other autonomic dysfunctions. PAF can progress to Parkinson's disease, MSA, or dementia with Lewy bodies.

Keywords:
ConversionOrthostatic hypotensionPure autonomic failureSympatheticSynucleinopathy

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Area of Science:

  • Neuroscience
  • Neurology
  • Autonomic Nervous System Disorders

Background:

  • Pure autonomic failure (PAF) is a rare neurodegenerative disease impacting the sympathetic nervous system.
  • It primarily manifests as orthostatic hypotension (OH) but can involve generalized autonomic dysfunction.
  • PAF is classified as an alpha-synucleinopathy, characterized by alpha-synuclein deposition in autonomic ganglia.

Purpose of the Study:

  • To discuss the clinical features of Pure Autonomic Failure.
  • To outline differential diagnoses for autonomic neuropathies.
  • To explore risk factors for phenoconversion to other synucleinopathies and treatment overview.

Main Methods:

  • Literature review and synthesis of existing research on Pure Autonomic Failure.
  • Analysis of clinical presentations and diagnostic criteria.
  • Review of progression pathways and treatment strategies for alpha-synucleinopathies.

Main Results:

  • Orthostatic hypotension is a primary symptom, but genitourinary, intestinal, and sweating dysfunctions are also common.
  • Differential diagnosis is crucial as symptoms overlap with other autonomic neuropathies.
  • A significant proportion of PAF cases can evolve into central nervous system synucleinopathies like Parkinson's disease, MSA, or DLB.

Conclusions:

  • Pure Autonomic Failure is a distinct alpha-synucleinopathy with potential for progression to more severe neurological disorders.
  • Understanding clinical features and risk factors is key for early diagnosis and management.
  • Further research into phenoconversion and treatment is warranted.