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Related Concept Videos

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 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...
Hypertension and Regulation of Blood Pressure01:18

Hypertension and Regulation of Blood Pressure

Hypertension, the most common cardiovascular disease, is diagnosed through repeated measurements of elevated blood pressure. Its risks, including damage to the kidney, heart, and brain, are directly proportional to blood pressure levels. Starting from 115/75 mm Hg, the risk of cardiovascular disease doubles with each increment of 20/10 mm Hg. The diagnosis relies on blood pressure measurements, not on patient symptoms, as hypertension is often asymptomatic until end-organ damage is imminent or...
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,...
Other Pulmonary Disorders01:17

Other Pulmonary Disorders

Respiratory disorders encompass a range of conditions with varying levels of severity. Asthma, marked by chronic airway inflammation and hypersensitivity, is one such condition. It can lead to airway obstruction due to factors like bronchial spasms, mucosal edema, increased mucus secretion, or epithelial damage. Asthma triggers are diverse, ranging from allergens to emotional upset, and treatment focuses on both immediate relief through bronchodilators and long-term inflammation suppression.

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Related Experiment Video

Updated: Jul 9, 2026

Acupoint Application Combined with Ear Plaster Therapy for Treating Sleep Disorders with Acute Exacerbation of Chronic Obstructive Pulmonary Disease
04:53

Acupoint Application Combined with Ear Plaster Therapy for Treating Sleep Disorders with Acute Exacerbation of Chronic Obstructive Pulmonary Disease

Published on: October 18, 2024

Obstructive sleep apnea and resistant hypertension: a case-control study.

Sandro Cadaval Gonçalves1, Denis Martinez, Miguel Gus

  • 1Division of Cardiology and Postgraduate Program in Cardiology, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil.

Chest
|December 15, 2007
PubMed
Summary

Obstructive sleep apnea syndrome (OSAS) is a significant risk factor for resistant hypertension. Early consideration of OSAS in patients with difficult-to-treat hypertension is crucial for effective management.

Related Experiment Videos

Last Updated: Jul 9, 2026

Acupoint Application Combined with Ear Plaster Therapy for Treating Sleep Disorders with Acute Exacerbation of Chronic Obstructive Pulmonary Disease
04:53

Acupoint Application Combined with Ear Plaster Therapy for Treating Sleep Disorders with Acute Exacerbation of Chronic Obstructive Pulmonary Disease

Published on: October 18, 2024

Area of Science:

  • Cardiology
  • Sleep Medicine
  • Hypertension Research

Background:

  • Obstructive sleep apnea syndrome (OSAS) is suspected to be linked with resistant hypertension.
  • However, the extent of this association and its independence from confounding factors remain unclear.

Purpose of the Study:

  • To determine the association between OSAS and resistant hypertension.
  • To evaluate if OSAS is an independent risk factor for resistant hypertension.

Main Methods:

  • A case-control study involving 63 patients with resistant hypertension and 63 controls with controlled blood pressure.
  • OSAS diagnosis was based on apnea-hypopnea index (AHI) using a portable home monitor.
  • Secondary analysis compared AHI across different hypertension phenotypes using ambulatory blood pressure monitoring (ABPM).

Main Results:

  • OSAS was significantly more prevalent in patients with resistant hypertension (71%) compared to controls (38%) (p < 0.001).
  • OSAS demonstrated a strong, independent association with resistant hypertension (OR, 4.8; 95% CI, 2.0 to 11.7).
  • AHI levels varied significantly across different blood pressure categories, including white coat and masked hypertension.

Conclusions:

  • The findings confirm OSAS as a significant and independent risk factor for resistant hypertension.
  • Clinicians should consider screening for comorbid OSAS in patients diagnosed with resistant hypertension.