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Related Concept Videos

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.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism, and...
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...
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...
Anatomy of Respiratory System I: Upper Respiratory Tract01:29

Anatomy of Respiratory System I: Upper Respiratory Tract

The upper respiratory tract plays a vital role in the respiratory system, comprising several structures that facilitate air intake and prepare air for the lungs. It also serves as the first line of defense against pathogens and particles. This tract includes the nose and nasal cavity, the oral cavity, the paranasal sinuses, and the pharynx, each with specific functions and features.
Nose and nasal cavity
The nose and nasal cavity represent the main external openings of the respiratory tract.
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...
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...

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Establishment of a Modified Ferric Chloride-Induced Superior Sagittal Sinus Thrombosis
07:34

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Published on: December 30, 2025

Silent sinus syndrome.

M C Miman1, M Akarcay, S Doganay

  • 1Otorhinolaryngology & Head and Neck Surgery Department, Inonu University, Malatya, Turkey.

Annals of Ophthalmology (Skokie, Ill.)
|October 23, 2009
PubMed
Summary
This summary is machine-generated.

Silent Sinus Syndrome (SSS) can cause enophthalmos and is treatable with endoscopic surgery. This case shows successful recovery of enophthalmos after endoscopic maxillary meatotomy.

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Area of Science:

  • Otolaryngology
  • Ophthalmology
  • Medical Imaging

Background:

  • Silent Sinus Syndrome (SSS) is a rare condition characterized by chronic maxillary sinusitis leading to orbital complications.
  • Enophthalmos, the recession of the eyeball within the orbit, can be a presenting symptom of SSS.

Observation:

  • A case of SSS with enophthalmos is presented, treated with unilateral endoscopic maxillary meatotomy.
  • Orbital floor reconstruction was intentionally delayed following the initial endoscopic sinus surgery.

Findings:

  • The patient experienced significant recovery of enophthalmos eight months post-surgery.
  • Radiological imaging confirmed improvement in the orbital and sinus structures.

Implications:

  • SSS should be considered in the differential diagnosis of enophthalmos.
  • Endoscopic sinus surgery is an effective treatment modality for SSS, potentially avoiding the need for more invasive orbital reconstruction.