Visual Analog Scale
Visual Analog Scale - Related Videos
16:59
Computer-assisted Large-scale Visualization and Quantification of Pancreatic Islet Mass, Size Distribution and Architecture
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Cited by 14 •
2011
Novel computer-assisted methods of large-scale procurement and analysis of immunohistochemically stained pancreatic specimens are described: (1) Virtual Slice capture of the entire section; (2) Mass analysis of large-scale data; (3) Reconstruction of 2D Virtual Slices; (4) 3D islet mapping; and (5) Mathematical analysis.
02:41
pH Scale
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2020
Hydronium and hydroxide ions are present both in pure water and in all aqueous solutions, and their concentrations are inversely proportional as determined by the ion product of water (Kw). The concentrations of these ions in a solution are often critical determinants of the solution’s properties and the chemical behaviors of its other solutes. Two different solutions can differ in their hydronium or hydroxide ion concentrations by a million, billion, or even trillion times. A common means of...
02:48
Labeling of Replicating HSV-1 Genomes with a Nucleoside Analog
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2026
Source: Dembowski, J. A., Deluca, N. A. Purification of Viral DNA for the Identification of Associated Viral and Cellular Proteins. J. Vis. Exp. (2017)This video demonstrates the infection of stationary-phase mammalian cells with HSV-1 (Herpes Simplex Virus-1), followed by replication of the viral genome using host and viral replication machinery. A synthetic nucleoside analog is incorporated into newly synthesized viral DNA to label replicating genomes, which are subsequently isolated for...
10:49
Power Input Measurements in Stirred Bioreactors at Laboratory Scale
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Cited by 9 •
2018
The power input in stirred bioreactors can be measured through the torque that acts on the impeller shaft during rotation. This manuscript describes how an air bearing can be used to effectively reduce friction losses observed in mechanical seals and improve the accuracy of power input measurements in small-scale vessels.
01:26
Scaling
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2024
In designing and analyzing filters, resonant circuits, or circuit analysis at large, working with standard element values like 1 ohm, 1 henry, or 1 farad can be convenient before scaling these values to more realistic figures. This approach is widely utilized by not employing realistic element values in numerous examples and problems; it simplifies mastering circuit analysis through convenient component values. The complexity of calculations is thereby reduced, with the understanding that...
FAQs
Endpoint descriptions give the mark a shared interpretive frame. On the 100-mm line, the low-intensity anchor identifies the starting reference, while the opposing description identifies the upper end of the intended experience. This anchoring allows the recorded distance to be understood as a numerical symptom score rather than as an uncontextualized mark.
Patient understanding can directly affect the score. If instructions are unclear, a person may interpret the anchors or the symptom being rated differently, weakening comparisons. Consistent wording and administration help make results more comparable across assessments, while the symptom itself matters because the same line format may be used for different subjective experiences.
Repeated assessments allow scores to be placed side by side across time. A clinician or investigator can record a result before an intervention and compare it with a later result to examine change. This supports symptom monitoring and treatment assessment, while recognizing that a single numerical score does not capture the entire clinical experience.
Administration requires presenting the patient with the 100-mm line, identifying the endpoint descriptions, and giving clear instructions about the symptom to rate. The patient then marks the position that represents the experience, and the distance from the low-intensity anchor is recorded as the score. Consistent instructions are important for meaningful comparison.
Clinicians may use the scale when they need a numerical record of a subjective symptom, most commonly pain intensity but also other symptoms. It can support an initial assessment, comparison before and after treatment, and monitoring during follow-up. Its value is greatest when the target symptom and administration conditions remain consistent.
The scale converts subjective symptom reports into numerical outcomes that can be recorded in a standardized format. Researchers can compare results across assessment points and examine responses associated with treatment or other clinical changes. Reliable interpretation depends on consistent instructions, clear identification of the symptom, and awareness that patient understanding influences the recorded value.