KOH


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KOH

KOH

chemical formula for potassium hydroxide.

KOH

Abbreviation for potassium hydroxide.

KOH

The chemical formula for potassium hydroxide, which is used to perform the KOH test. The tests is also called a potassium hydroxide preparation.
Mentioned in: KOH Test

potassium hydroxide

; KOH topical, strongly alkaline, caustic and keratolytic chemical, liberating hydroxyl (OH-) ions on dissolution in sweat; OH- ions react with and break down side salt linkages of keratin molecules; formulated as 85% pellets; used to achieve local destruction of tissue (e.g. nail matrix) or lesions (e.g. verrucae); see Table 1
Table 1: Caustic agents used in podiatric practice to achieve local tissue destruction
AgentActionSpecial precautionsContraindications
Monochloroacetic acid (crystals or saturated solution) e.g. single VPKeratolytic; hydrolysing agent
Non-self-limiting
Deep penetration
Painful
Do not use mask if applying solution
Use a mask if applying crystals
Review in 5-7 days
Neutralize with foot bath ± NaHCO3 or NaCl
Soft-tissue atrophy
Peripheral vascular disease
Sensory neuropathy
Salicylic acid paste (40-70%) e.g. single VP; plantar hard cornKeratolytic; hydrolysing agentMacerates tissues
Review in 7-14 days
May be used in conjunction with monochloroacetic acid crystals
Neutralize with foot bath ± NaHCO3 or NaCl
Soft-tissue atrophy
Peripheral vascular disease
Sensory neuropathy
Pyrogallic acid e.g. single VPKeratolytic; oxidizing agentDeep penetration
Review in 3-5 days
Prolonged caustic action
Do not apply more than 3 times sequentially
Stains skin black/brown
Use with great care: may cause deep tissue breakdown
Soft-tissue atrophy
Peripheral vascular disease
Sensory neuropathy
Trichloroacetic acid (saturated solution; 10% solution) e.g. mosaic VPMild keratolytic
Protein precipitant
Shallow penetration
Neutralize with foot bath ± NaHCO3 or NaCl
Review in 3 weeks
Peripheral vascular disease
Sensory neuropathy
Silver nitrate (70% solution; 75-95% stick) e.g. mosaic VP; as a protective skin application below a maskProtein precipitant
Self-limiting
Stains skin black/brown
Maximum effect occurs within 24 hours
Some patients show hypersensitivity to silver nitrate (or experience acute pain)
Neutralize with NaCl foot bath
May be applied in alternate layers with trichloroacetic acid
Peripheral vascular disease
Known sensitivity
Potassium hydroxide (KOH; 85% pellets)Strong keratolyticPotentially deep penetration
Action of KOH stopped by application of 5% acetic acid after macerated coagulum has been removed
Single treatment
Soft-tissue atrophy
Peripheral vascular disease
Sensory neuropathy
Phenol (80% solution or 100% crystal)Protein precipitateAction retarded by flooding with industrial methylated spirit
Skin overspill flooded with glycerine
Review as per postoperative protocol
Peripheral vascular disease (phenol suppresses inflammatory response)

VP, verruca pedis.

KOH

potassium hydroxide.
References in periodicals archive ?
Using the extracted sawdust as starting material, KOH as activating agent, and a fixed activation temperature at 750[degrees]C for 2 hours, the effects of mass ratio of KOH to raw materials on the porosity development of ACs are shown in Figure 1.
With the increase of activation temperature, the reaction rate between the activator of KOH and the carbon increases fast.
Olgularin 85'inde (%85) KOH ile direk mikroskobik inceleme, 81'inde (%81) PAS boyasi ile histopatolojik inceleme ve 19'unda (%19) kultur pozitifti.
Brodell said the KOH prep is exempted from the Clinical Laboratory Improvement Act (CLIA) of 1988, so you do not have to pay the $400 biannual fee or undergo a lab inspection in order to do them.
The DMSO, in fact, does carry the KOH into the keratin much more rapidly; and, unless the specimen is quite thick or is, for example, a piece of nail plate (either of which may require five to 10 minutes of 'soaking'), the specimen can be examined immediately and is usually cleared much quicker than even heating KOH and water.
We felt that the most original and effective way for KOH to help was to create and promote a series of collector items such as the diamond nail fail," said Mrs.
KOH COSMETICS, a World Leader in Luxury Hand and Nail Products, Kicks off Their Collector's Item Series With the 28-Carat Diamond-Studded "KOH Diamond Nail File"