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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...
Respiratory Volumes and Capacities I01:26

Respiratory Volumes and Capacities I

Assessing the respiratory rate and rhythm for a complete minute is crucial for evaluating the breathing pattern. Even a minor increase in the patient's average respiratory rate, by as little as three to five breaths per minute, is an early and vital indicator of respiratory distress. Patients with a respiratory rate exceeding twenty-four breaths per minute require close monitoring to determine the physiological alterations. This careful observation is essential for prompt recognition and...
Sleep-Wake Cycles01:24

Sleep-Wake Cycles

Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
Hyperpnea and Hyperventilation01:25

Hyperpnea and Hyperventilation

Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
Decreased pulse rate01:14

Decreased pulse rate

Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
There are specific risk factors that can elevate the likelihood of developing bradycardia. Advanced age is a significant factor, with bradycardia...

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Association Between Sleep Quality and Cognitive Symptoms in Patients with Major Depressive Disorder
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Published on: April 26, 2024

Sleep Apnoea Variability in Pacemaker Patients: A Women-Predominant Phenotype.

Philipp Spitaler1, Valentin Bilgeri1, Gudrun Feuchtner2

  • 1Department of Internal Medicine III, Medical University of Innsbruck, Innsbruck, Austria.

European Journal of Clinical Investigation
|May 15, 2026
PubMed
Summary

Night-to-night variability in sleep apnea (SA) reveals distinct patient phenotypes. A Mild-Unstable phenotype, more common in women and associated with obesity, experiences intermittent severe events despite a low average respiratory disturbance index (RDI).

Keywords:
implantable devicesnight‐to‐night variabilityphenotypingsex/gender differencessleep apnoea

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Multi-Modal Home Sleep Monitoring in Older Adults
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Multi-Modal Home Sleep Monitoring in Older Adults

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Association Between Sleep Quality and Cognitive Symptoms in Patients with Major Depressive Disorder
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Published on: April 26, 2024

Multi-Modal Home Sleep Monitoring in Older Adults
07:40

Multi-Modal Home Sleep Monitoring in Older Adults

Published on: January 26, 2019

Area of Science:

  • Sleep Medicine
  • Cardiology
  • Respiratory Medicine

Background:

  • Single-night polysomnography may not capture the full spectrum of sleep apnea (SA) severity due to night-to-night variability.
  • Longitudinal analysis of SA phenotypes, particularly in women, can reveal clinically relevant patterns.
  • Device-detected respiratory disturbance index (RDI) and instability metrics offer insights into SA variability.

Purpose of the Study:

  • To characterize sex/gender-specific longitudinal sleep apnea phenotypes using RDI and an instability metric.
  • To identify predictors of these phenotypes, focusing on female sex/gender and obesity.

Main Methods:

  • Analysis of over 37,000 nights from 207 pacemaker patients with at least 180 valid nightly RDI measurements.
  • Phenotype classification based on mean RDI (<20 vs. ≥20 events/h) and an Instability Index (derived from RDI standard deviation and mean RDI).
  • Logistic regression used to identify independent predictors of the Mild-Unstable phenotype.

Main Results:

  • Four phenotypes were identified: Mild-Stable, Mild-Unstable, Severe-Stable, and Severe-Unstable.
  • Women were disproportionately represented in the Mild-Unstable phenotype (61.2% vs. 33.8% in Mild-Stable; p=0.002).
  • Female sex/gender (aOR 3.38) and obesity (aOR 3.80) were independent predictors of the Mild-Unstable phenotype.
  • Mild-Unstable patients experienced more severe-range nights (RDI ≥20/h) than Mild-Stable patients (7.8% vs. 2.2%; p<0.001).

Conclusions:

  • Night-to-night RDI variability identifies longitudinal SA phenotypes missed by mean RDI alone.
  • A Mild-Unstable phenotype, prevalent in females and associated with obesity, exhibits intermittent severe SA despite low average RDI.
  • Instability in severe SA can lead to underestimation of severity based on single-night testing.