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Related Concept Videos

Alterations in Blood Pressure01:30

Alterations in Blood Pressure

Alterations in blood pressure, such as hypertension (high blood pressure) and hypotension (low blood pressure), significantly affect human health. Understanding these conditions' classifications, causes, and symptoms is essential for effective management and treatment.
Hypertension (High blood pressure)
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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.
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Sleep Apnea01:21

Sleep Apnea

Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
The condition is more prevalent among...
Hypertension I: Introduction01:28

Hypertension I: Introduction

Hypertension is a widespread, long-term medical condition where blood pressure in the arteries remains elevated. It is characterized by systolic blood pressure readings of 130 mm Hg or above or diastolic blood pressure (DBP) readings of 80 mm Hg or higher. Unmanaged hypertension poses significant health risks, making the distinction between primary (or essential) hypertension and secondary hypertension crucial, as their management and implications vary.Primary HypertensionPrimary hypertension,...
Hypertension II: Pathophysiology01:29

Hypertension II: Pathophysiology

Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
Hypertension III: Clinical Manifestations and Diagnostic Studies01:30

Hypertension III: Clinical Manifestations and Diagnostic Studies

Hypertension is asymptomatic and also referred to as the "silent killer" until it progresses to a severe stage or causes target organ disease. Patients may experience symptoms stemming from the strain on blood vessels and tissues in various organs or the heart's increased workload.Physical exams might show no abnormalities other than high blood pressure. Signs of vascular damage, when present, correspond to the organs supplied by the affected vessels, leading to target organ damage. For...

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Related Experiment Video

Updated: Jul 12, 2026

Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea
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Obstructive sleep apnoea causes transient and sustained systemic hypertension.

C W Zwillich1

  • 1Department of Medicine, University of Colorado Health Sciences Center, Denver, USA.

International Journal of Clinical Practice
|November 24, 1999
PubMed
Summary

Obstructive sleep apnoea (OSA) increases blood pressure via sympathetic nervous system activity. Effective continuous positive airway pressure (CPAP) therapy significantly reduces this hypertension in OSA patients.

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Area of Science:

  • Cardiovascular Physiology
  • Sleep Medicine
  • Neuroendocrinology

Background:

  • Obstructive sleep apnoea (OSA) is linked to elevated blood pressure and heightened sympathetic nervous system activity.
  • Apnoea episodes cause oxygen desaturation, leading to increased blood pressure and sympathetic surges.
  • This sympathetic overactivity persists during wakefulness in untreated OSA patients.

Purpose of the Study:

  • To investigate the role of sympathetic nervous system activity in hypertension associated with obstructive sleep apnoea.
  • To evaluate the impact of nasal continuous positive airway pressure (CPAP) therapy on sympathetic activity and blood pressure in OSA patients.

Main Methods:

  • Measuring blood pressure, catecholamine levels, and muscle sympathetic nerve activity during apnoea and following its termination.
  • Assessing changes in sympathetic activity and blood pressure in untreated OSA patients before and after effective CPAP therapy.

Main Results:

  • Apnoea episodes trigger a significant increase in blood pressure and sympathetic nerve activity.
  • Following apnoea cessation, sympathetic activity and blood pressure decrease, suggesting sympathetic modulation of vascular resistance.
  • Untreated OSA patients show high sympathetic nervous system activity during wakefulness.
  • Effective CPAP therapy markedly reduces sympathetic hyperexcitation in previously untreated OSA patients.

Conclusions:

  • Systemic hypertension in untreated OSA is primarily mediated by sympathetic nervous system overactivity.
  • Nasal CPAP therapy is an effective treatment for reducing sympathetic-mediated hypertension in OSA patients.