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Related Concept Videos

Sinusoidal Sources01:18

Sinusoidal Sources

Direct current (DC) refers to an electric current that flows in a single direction, maintaining a constant polarity. This is in contrast to alternating current (AC), which periodically changes its direction and magnitude. AC forms the backbone of modern electricity transmission and distribution systems due to its efficient long-distance transmission capabilities.
In homes, the power supplies use sinusoidal sources to provide electricity. These sources generate a voltage that varies sinusoidally...
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
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Sinus Node Arrhythmias
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Mitral Stenosis II: Clinical features and Diagnostic Tests01:23

Mitral Stenosis II: Clinical features and Diagnostic Tests

Mitral stenosis is a heart condition in which the mitral valve, which allows blood to flow from the left atrium to the left ventricle, becomes narrowed or stenotic. This narrowing hinders blood flow and leads to clinical symptoms requiring specific medical evaluations and management strategies. The following overview outlines the clinical symptoms, assessments, diagnostic findings, prevention methods, and treatments for mitral stenosis.Clinical ManifestationsDyspnea (shortness of breath): This...
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Angina II: Classification

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Graphical and Analytic Representation of Sinusoids01:20

Graphical and Analytic Representation of Sinusoids

Analyzing two sinusoidal voltages with equal amplitude and period but different phases on an oscilloscope, an instrument used to display and analyze waveforms, involves a three-step process.
The first step is measuring the peak-to-peak value, which is twice the amplitude of the sinusoid. This provides information about the maximum voltage swing of the waveform.
Secondly, the period and angular frequency are determined. The period is the time taken for one complete cycle of the waveform, while...
Mitral Regurgitation II: Clinical Features and Diagnostic Tests01:23

Mitral Regurgitation II: Clinical Features and Diagnostic Tests

Mitral regurgitation (MR) is a valvular heart disorder in which the mitral valve fails to close tightly, allowing blood to leak backward into the heart. Understanding the clinical manifestations, assessment, diagnostic findings, and medical management of MR is crucial to effectively managing affected patients.Clinical Manifestations of Mitral RegurgitationMitral regurgitation can be acute or chronic, each presenting differently and requiring different approaches:1. Acute Mitral...

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Updated: May 14, 2026

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention
04:32

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention

Published on: December 20, 2024

[Silent sinus syndrome--two cases report].

M Barbosa1, D Portmann, M Potena

  • 1Georges Portmann Institute, 114 avenue d'Arès, 33074 Bordeaux Cedex, France. marcoribarbosa@yahoo.com

Revue De Laryngologie - Otologie - Rhinologie
|February 12, 2013
PubMed
Summary
This summary is machine-generated.

Silent Sinus Syndrome (SSS) causes eye and facial changes due to retracted sinus walls. Early sinus drainage surgery can reverse these symptoms, supporting the Hypoventilation Theory.

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Area of Science:

  • Otolaryngology
  • Ophthalmology
  • Radiology

Background:

  • Silent Sinus Syndrome (SSS) is a rare condition characterized by maxillary sinus wall retraction, leading to enophthalmos and midfacial depression.
  • SSS typically presents without sinonasal symptoms, complicating diagnosis.
  • The Hypoventilation Theory suggests impaired sinus ventilation is key to SSS pathogenesis.

Observation:

  • Two cases of SSS are presented: a 65-year-old male with insidious enophthalmos and a 34-year-old female with sudden onset enophthalmos and diplopia.
  • CT scans confirmed SSS in both patients, involving maxillary and ethmoidal sinuses.
  • Neither patient reported typical sinonasal symptoms.

Findings:

  • Surgical sinus drainage in the male patient resulted in slight improvement of ocular asymmetry.
  • Early endoscopic sinus surgery in the female patient led to complete reversal of enophthalmos and correction of diplopia.

Implications:

  • These cases highlight the importance of considering SSS in patients with unexplained enophthalmos and diplopia.
  • Early surgical intervention, specifically sinus drainage, appears crucial for favorable outcomes in SSS.
  • The findings provide further support for the Hypoventilation Theory in the etiology of Silent Sinus Syndrome.