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In radiotherapy, a percentage depth dose curve (PDD) (sometimes percent depth dose curve) relates the absorbed dose deposited by a radiation beam into a medium as it varies with depth along the axis of the beam. The dose values are divided by the maximum dose, referred to as d max, yielding a
This is a list of roots, suffixes, and prefixes used in medical terminology, their meanings, and their etymologies. Most of them are combining forms in Neo-Latin and hence international scientific vocabulary. There are a few general rules about how they combine.
The main discussion of these abbreviations in the context of drug prescriptions and other medical prescriptions is at List of abbreviations used in medical prescriptions. Some of these abbreviations are best not used, as marked and explained here.
Past medical history (see also medical history) PSI: Pneumonia severity index: PSP: phenylsulphtalein: PSS: progressive systemic sclerosis (see scleroderma) PSVT: paroxysmal supraventricular tachycardia: PT: prothrombin time physical therapy (physiotherapy) Pt. patient (from Latin patiens, meaning "one who endures" or "one who suffers") PTA
PDD Pervasive developmental disorder: PDD-NOS Pervasive developmental disorder, not otherwise specified: PDD/NOS Pervasive developmental disorder, not otherwise specified: PDS Pokkuri Death Syndrome PE Pulmonary embolism: PKAN Panthothenate kinase-associated neurodegeneration: PLMD Periodic limb movement disorder: PLS Primary lateral sclerosis: PMD
Based on the relationship with levodopa dosing, dyskinesia most commonly occurs at the time of peak l-DOPA plasma concentrations and is thus referred to as peak-dose dyskinesia (PDD). As patients advance, they may present with symptoms of diphasic dyskinesia (DD), which occurs when the drug concentration rises or falls.
Many use the term PDD as a short way of saying PDD-NOS. [4] Others use the general category because the term PDD actually refers to a category of disorders and is not a diagnostic label. [4] PDD is not itself a diagnosis, while PDD-NOS is a diagnosis. To further complicate the issue, PDD-NOS can also be referred to as "atypical personality ...
Pronunciation follows convention outside the medical field, in which acronyms are generally pronounced as if they were a word (JAMA, SIDS), initialisms are generally pronounced as individual letters (DNA, SSRI), and abbreviations generally use the expansion (soln. = "solution", sup. = "superior").