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Related Concept Videos

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

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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,...
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Computed Tomography01:10

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Imaging Studies III: Computed Tomography01:27

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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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What do you think is the single most influential factor in determining with whom you become friends and whom you form romantic relationships? You might be surprised to learn that the answer is simple: the people with whom you have the most contact. This most important factor is proximity. You are more likely to be friends with people you have regular contact with. For example, there are decades of research that shows that you are more likely to become friends with people who live in your dorm,...
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Topographic surveying is critical for documenting the Earth's surface, focusing on capturing elevations, slopes, and natural and man-made features. It is essential in construction planning, water resource management, and land-use analysis. The primary outcome of such surveys is a topographic map, which uses contour lines to visually represent the shape and slope of the terrain, providing valuable insights into the landscape's characteristics.Contour lines are fundamental to understanding the...
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Topographic maps represent the Earth's surface features using contour lines, which connect points of equal elevation to create a two-dimensional representation of three-dimensional terrain. Creating a topographic map requires a systematic approach.Begin by plotting a scaled grid and marking intersections corresponding to the survey's elevation data points. Assign elevation values at these intersections to build the base map. Next, determine contour levels using a consistent contour interval,...
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Related Experiment Video

Updated: Feb 13, 2026

Quantitative Analysis and Characterization of Atherosclerotic Lesions in the Murine Aortic Sinus
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Topographic relationship; sinusitis and paranasal sinus computed tomography.

O Kemal, T Müderris, G Kutlar

    B-ENT
    |March 20, 2018
    PubMed
    Summary

    This study found no direct relationship between chronic rhinosinusitis symptoms and paranasal sinus CT scan findings. While some specific correlations were noted, overall symptom scores did not align with CT results.

    Area of Science:

    • Otolaryngology
    • Radiology
    • Medical Imaging

    Background:

    • The link between chronic rhinosinusitis (CRS) symptoms and computed tomography (CT) findings is debated.
    • Topographic symptom presentation and CT evidence in CRS remain controversial.

    Purpose of the Study:

    • To investigate the correlation between topographic paranasal sinus CT findings and symptoms.
    • To determine the relationship between overall CT findings and overall symptom presentation in CRS patients.

    Main Methods:

    • A two-center study included 166 patients diagnosed with chronic sinusitis.
    • Patients underwent paranasal sinus CT scans and completed symptom questionnaires.
    • CT findings and symptom scores were statistically compared.

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    Main Results:

    • Anterior ethmoid sinusitis correlated with hyposmia.
    • Osteomeatal complex blockage and posterior ethmoid sinusitis were linked to halitosis.
    • Maxillary and sphenoid sinusitis showed associations with tooth pain, but overall scores and facial pain/pressure did not correlate with CT findings.

    Conclusions:

    • No significant relationship was found between overall symptoms and paranasal sinus CT findings in chronic rhinosinusitis patients.
    • Specific localized correlations exist but do not represent a generalizable link between symptoms and CT evidence.