Related Experiment Video
Updated: Feb 16, 2026

Measuring Cardiac Autonomic Nervous System ANS Activity in Toddlers - Resting and Developmental Challenges
Published on: February 25, 2016
Paroxysmal sympathetic hyperactivity: An entity to keep in mind
D A Godoy1, P Panhke2, P D Guerrero Suarez3
1Unidad de Cuidados Neurointensivos, Sanatorio Pasteur, Catamarca, Argentina; Unidad de Terapia Intensiva, Hospital San Juan Bautista, Catamarca, Argentina.
Paroxysmal sympathetic hyperactivity (PSH) is a serious neurological condition after brain injury. Early recognition and treatment are crucial for better patient outcomes in managing this sympathetic nervous system disorder.
Area of Science:
- Neurology
- Neurocritical Care
Background:
- Paroxysmal sympathetic hyperactivity (PSH) is a critical neurological condition.
- It arises secondary to acute acquired brain injuries.
- PSH presents with cyclic exacerbations of sympathetic discharge.
Purpose of the Study:
- To elucidate the characteristics of PSH.
- To discuss diagnostic challenges and current understanding of PSH.
- To highlight the importance of timely management.
Main Methods:
- Clinical observation and case reviews.
- Analysis of diagnostic criteria and physiopathological models.
- Review of therapeutic strategies for PSH.
Main Results:
- PSH diagnosis relies on clinical findings; validated criteria are lacking.
- The excitation-inhibition model best explains PSH.
- Early recognition and intervention are vital.
Conclusions:
- PSH is a life-threatening neurological emergency requiring prompt management.
- Effective treatment involves preventing and aborting sympathetic crises.
- Delayed diagnosis correlates with poorer patient outcomes.
Related Concept Videos
Sympathetic Activation
Disorders of the Autonomic Nervous System
Raynaud's disease, also known as Raynaud's...
Adrenal Gland Disorders
Adrenal insufficiency, characterized by insufficient cortisol and aldosterone production, leads to conditions like Addison's disease. This disorder, affecting the adrenal cortex, exhibits symptoms such as skin bronzing, dehydration, low blood pressure, fatigue, and weight loss. Congenital adrenal hyperplasia, a genetic ailment causing...
The Sympathetic Nervous System
Sympathetic Pathways: Collateral Ganglia and Adrenal Medulla
Collateral Ganglia
Sympathetic preganglionic axons reach the collateral ganglia along the route of splanchnic nerves. These nerves bypass the sympathetic trunk and communicate with sympathetic postganglionic neurons housed in the prevertebral ganglia. These ganglia supply the organs of the abdominopelvic cavity.
The greater splanchnic nerve, formed by the...
Toxidromes: Clinical Features

