Dullness

Dullness is a clinical finding characterized by reduced alertness, slowed responses, or diminished mental engagement, making it an important sign of altered neurological or systemic function. It can arise when normal brain arousal is disrupted by conditions such as metabolic imbalance, infection, medication effects, intoxication, or structural nervous-system disease, and clinicians assess it through observation and responsiveness to verbal or physical stimuli. Recognizing dullness helps distinguish changes in consciousness from ordinary fatigue and supports timely evaluation of the underlying cause. Careful assessment of onset, severity, associated symptoms, and progression can guide further examination, testing, monitoring, and treatment.

Dullness - Related Videos

Education

JoVE Science Education - Clinical Skills

Abdominal Exam II: Percussion

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2023

Source: Alexander Goldfarb, MD, Assistant Professor of Medicine, Beth Israel Deaconess Medical Center, MA Medical percussion is based on the difference in pitch between the sounds elicited by tapping on the body wall. The auditory response to tapping depends on the ease with which the body wall vibrates, and is influenced by underlying organs, strength of the stroke, and the state of the body wall. There are three main medical percussion sounds: resonance (heard over lungs), tympany (heard over...

Research

JoVE Journal - Immunology and Infection

Examination of Thymic Positive and Negative Selection by Flow Cytometry

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Cited by 22 •

2012

We present a flow cytometry-based method to examine T cell development in vivo using genetically manipulated mice on a wildtype or T cell receptor transgenic background.

Isolation and Characterization of Dendritic Cells and Macrophages from the Mouse Intestine

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Cited by 68 •

2012

Here, we detail a methodology for the rapid isolation of mouse intestinal dendritic cells (DCs) and macrophages. Phenotypic characterization of intestinal DCs and macrophages is performed using multi-color flow cytometric analysis while magnetic bead enrichment followed by cell sorting is used to yield highly pure populations for functional studies.

Percussion

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2023

Source: Jaideep S. Talwalkar, MD, Internal Medicine and Pediatrics, Yale School of Medicine, New Haven, CT Simply stated, percussion refers to the striking of one object against another to produce sound. In the early 1700s, an Austrian inn-keeper's son, named Leopold Auenbrugger, discovered that he could take inventory by tapping his father's beer barrels with his fingers. Years later, while practicing medicine in Vienna, he applied this technique to his patients and published the first...

Sensory Exam

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2023

Source:Tracey A. Milligan, MD; Tamara B. Kaplan, MD; Neurology, Brigham and Women's/Massachusetts General Hospital, Boston, Massachusetts, USA A complete sensory examination consists of testing primary sensory modalities as well as cortical sensory function. Primary sensory modalities include pain, temperature, light touch, vibration, and joint position sense. Sensation of the face is discussed in the videos Cranial Nerves Exam I and II, as are the special senses of smell, vision, taste, and...

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