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Related Concept Videos

Chemical Factors Affecting Respiration Centers01:31

Chemical Factors Affecting Respiration Centers

Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
CO2 has a potent influence on respiration and is strictly regulated. Under...
Acute Respiratory Failure-IV01:23

Acute Respiratory Failure-IV

Respiratory failure can manifest suddenly or gradually, characterized by a rapid decline in PaO2 and a rapid rise in PaCO2. This situation indicates a severe respiratory problem that may quickly become a life-threatening emergency. One of the early signs of hypoxemic Acute Respiratory Failure (ARF) is a change in mental status due to the brain's sensitivity to oxygen levels and changes in acid-base balance. Symptoms such as restlessness, confusion, and agitation suggest inadequate oxygen...
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...
Cardiopulmonary Resuscitation IV: Pharmacological Management01:25

Cardiopulmonary Resuscitation IV: Pharmacological Management

Pharmacologic intervention is crucial in treating cardiac arrest patients during ACLS or Advanced Cardiovascular Life Support. The ACLS algorithms guide the administration of specific drugs based on the patient's cardiac arrest rhythm, which includes pulseless ventricular tachycardia (VT), ventricular fibrillation (VF), asystole, and pulseless electrical activity (PEA).EpinephrineIndication: Epinephrine is the first-line drug for all cardiac arrest rhythms.Mechanism of Action: Epinephrine...
Acute Coronary Syndrome V: Nursing Management01:26

Acute Coronary Syndrome V: Nursing Management

Nursing Assessment:Nursing management of acute coronary syndrome (ACS) involves taking the patient's history, focusing on primary complaints such as chest pain, dyspnea, and excessive sweating (diaphoresis), as well as other symptoms like back or jaw pain, nausea, vomiting, palpitations, dizziness, and fatigue. The nurse also reviews the patient's history of cardiac events, risk factors such as hypertension, diabetes, smoking, family history, and current medications.In the objective assessment,...
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:

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[Autonomic dysfunction in cardiopulmonary diseases].

Der Internist·2002
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[Autonomic dysfunction in heart diseases and diabetes mellitus. Monitoring and diagnosis].

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Successful thrombolysis of st. Jude medical aortic prosthesis with tissue-type plasminogen activator in a pregnant woman: a case report.

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Left ventricular diastolic dysfunction as an early manifestation of diabetic cardiomyopathy.

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Updated: Jun 25, 2026

How to Administer Near-Infrared Spectroscopy in Critically ill Neonates, Infants, and Children
07:27

How to Administer Near-Infrared Spectroscopy in Critically ill Neonates, Infants, and Children

Published on: August 19, 2020

Cardiac chemoreflex sensitivity in critically ill patients.

P O Schueller1, S Steiner, M G Hennersdorf

  • 1Division of Cardiology, Pneumology and Angiology, Department of Medicine, Heinrich Heine University Hospital, Dusseldorf, Germany. schueller@med.uni-duesseldorf.de

Journal of Physiology and Pharmacology : an Official Journal of the Polish Physiological Society
|February 17, 2009
PubMed
Summary

Critical illness, including sepsis and cardiogenic shock, impairs chemoreflex sensitivity (ChRS). Reduced ChRS indicates autonomic dysfunction and correlates with illness severity, impacting patient outcomes.

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07:52

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Published on: January 29, 2011

Area of Science:

  • Cardiovascular Physiology
  • Autonomic Nervous System Function
  • Critical Care Medicine

Background:

  • Chemoreflexes are vital for maintaining ventilatory and cardiovascular homeostasis.
  • Autonomic dysfunction is a significant factor in the pathophysiology and prognosis of critically ill patients.

Purpose of the Study:

  • To investigate the role of autonomic dysfunction, specifically chemoreflex sensitivity (ChRS), in critically ill patients.
  • To assess the relationship between ChRS and the severity of illness in patients with sepsis or cardiogenic shock.

Main Methods:

  • Chemoreflex sensitivity (ChRS) was determined by measuring the RR interval shift in response to oxygen inhalation.
  • Pathological ChRS was defined as a value below 3.0 ms/mmHg.
  • The study included 27 critically ill patients (17 sepsis, 10 cardiogenic shock) and a control group.

Main Results:

  • Critically ill patients exhibited significantly reduced ChRS compared to controls (sepsis: 2.1 ± 1.68 ms/mmHg; cardiogenic shock: 0.4 ± 0.27 ms/mmHg; controls: 5.0 ± 2.8 ms/mmHg).
  • A significant negative correlation (r = -0.6; P < 0.01) was observed between ChRS and the SOFA score, indicating higher illness severity.
  • Reduced ChRS suggests a shift towards increased sympathetic activity in critically ill patients.

Conclusions:

  • Autonomic dysfunction, characterized by reduced chemoreflex sensitivity, is prevalent in critically ill patients.
  • Chemoreflex sensitivity is inversely correlated with illness severity (SOFA score) in sepsis and cardiogenic shock.
  • These findings highlight the importance of assessing autonomic function in critical care settings for predicting patient outcomes.