Edgepedia

Transient hypogammaglobulinemia of infancy

Transient hypogammaglobulinemia of infancy (THI, immunoglobulin maturational delay, ICD-10 D80.7) is a primary immunodeficiency with IgG more than 2 SD below age norms between 5 and 24 months, normal vaccine responses, and later recovery.

Transient hypothyroxinaemia

Transient hypothyroxinaemia: temporary postnatal low T4 with normal or low TSH, affecting roughly half of preterm infants; trials of thyroxine supplementation show no clear neurodevelopmental benefit.

Transient ischemic attack

A transient ischemic attack, or TIA, is a brief episode of stroke-like neurological symptoms, such as facial drooping and arm weakness, that resolves within minutes to hours.

Oct 22, 2026

Transient localization in organic semiconductors

Transient localization is a model of charge transport in crystalline organic semiconductors where thermal fluctuations of weakly bonded molecules briefly localize carriers, combining hopping and band-like transport.

Oct 20, 2026

Transient motor tics

Transient motor tics (ICD-11 8A05.03; DSM-5 provisional tic disorder, formerly transient tic disorder) are sudden, non-rhythmic movements such as blinking or sniffing present under 1 year, common in childhood and usually fading.

Transient myeloproliferative syndrome

Transient myeloproliferative syndrome, also called transient abnormal myelopoiesis (TAM), TMD, or transient leukemia, is a GATA1-mutation, trisomy 21 neonatal megakaryoblast proliferation in ~10% of Down syndrome newborns that usually remits spontaneously but carries a 10–30% risk of later myeloid leukemia.

Transient neonatal diabetes mellitus

Transient neonatal diabetes mellitus is a rare form of diabetes beginning in the first weeks of life that requires insulin but usually remits by 3 to 6 months.

Transient pseudohypoaldosteronism

Transient pseudohypoaldosteronism (TPHA, secondary pseudohypoaldosteronism) is a rare infantile renal tubulopathy with tubular aldosterone resistance, causing hyponatremia, hyperkalemia, and metabolic acidosis during urinary tract infection or malformation.

Transient Reactor Test Facility

The Transient Reactor Test Facility (TREAT) is an air-cooled test reactor at Idaho National Laboratory that simulates reactor accidents in fuel samples; built by Argonne, it ran from 1959 to 1994 and restarted in 2017.

Transient receptor potential cation channel subfamily M

TRPM (melastatin) subfamily, TRPM1–TRPM8: eight mammalian TRP cation channels spanning divalent-selective, non-selective, and monovalent-only permeability, with kinase-linked TRPM6/7, cold sensor TRPM8, and kidney disease roles.

Oct 20, 2026

Transient receptor potential cation channel subfamily V member 5

TRPV5 (ECaC, CaT2) is a kidney-specific, highly calcium-selective TRPV ion channel in the distal convoluted and connecting tubules, the rate-limiting apical entry step of renal calcium reabsorption, regulated by PTH, vitamin D, PIP2, calmodulin, and Klotho, and linked to kidney stone variants.

Transient recovery voltage

Transient recovery voltage (TRV) is the voltage that appears across a circuit breaker's terminals immediately after it interrupts a current, largely determining whether the breaker can clear a fault.

Transient refractive change

Transient refractive change is a temporary, reversible shift in the eye's refractive state, classified in ICD-11 as 9D00.6; it is best known in diabetes, where glucose swings shift refraction.

Transient response

Transient response is the behavior of a dynamic system between a disturbance, such as a switch closure or load change, and the establishment of a new steady state.

Transient response to cumulative emissions

The transient response to cumulative emissions, or TCRE, is the ratio of global warming to total CO2 emitted, about 1.65°C per 1000 gigatonnes of carbon.

Transient stability

Transient stability, a branch of rotor angle stability also called large-disturbance angular stability, is a power system's ability to maintain synchronism through a severe disturbance, such as a transmission-line short circuit, and regain equilibrium afterward.

Transient stability analysis

Transient stability analysis is a power systems engineering method that determines whether a grid's synchronous generators remain in synchronism after a large disturbance, such as a short circuit.

Transient storage

Transient storage is the temporary detainment of stream solutes in slow-moving zones like eddies and porous gravel, forming the basis of the transient storage model introduced by Bencala and Walters in 1983.

Sep 17, 2026

Transient synovitis

Transient synovitis, also called toxic synovitis, is a benign, self-limiting inflammation of the hip joint lining in children that causes hip pain and limping and recovers within two weeks.

Transient tachypnoea of newborn

Transient tachypnoea of the newborn (TTN, wet lung) is a self-limiting neonatal breathing disorder from delayed fetal lung fluid clearance, causing tachypnea within 2 hours of birth, resolving in 24-72 hours.

Transient testing

Transient testing is an experimental nuclear engineering method that subjects reactor fuels and materials to short bursts of intense neutron flux, studying behavior under accident-like conditions.

Transient thermal analysis

Transient thermal analysis is an engineering simulation method that computes temperature as a function of position and time under time-varying heat loads, using the heat equation.

Transient transfection

Transient transfection is a cell biology method that introduces DNA or RNA into cultured cells without genomic integration, producing temporary expression that fades over several days.

Transient tyrosinemia of the newborn

Transient tyrosinemia of the newborn (transient neonatal tyrosinemia, ICD-10 P74.5) is a benign, self-limiting elevation of blood tyrosine in newborns, especially preterm infants on high-protein diets, caused by immature liver 4-HPPD enzyme and usually resolving by 2 months.