What is trough in pharmacology?
The trough level is the lowest concentration in the patient’s bloodstream, therefore, the specimen should be collected just prior to administration of the drug. The peak level is the highest concentration of a drug in the patient’s bloodstream.
What is the difference between peak and trough?
The lowest level of the drug in the patient’s body is called the trough level. The peak for a drug is when the level of the drug in the patient’s body is the highest.
What are peak and trough levels used for?
Peak and trough levels are drawn to determine a drug’s concentration within the system. They help determine if a drug is in a toxic range or if the dosage of the medication needs to be increased. It is important to know which medications need to be monitored and what the signs and symptoms of toxicity are.
What does it mean peak to trough?
Peak-to-trough ratio (PTR), also known as peak-to-trough variation or peak-to-trough fluctuation, is a parameter in pharmacokinetics which is defined as the ratio of Cmax (peak) concentration and Cmin (trough) concentration over a dosing interval for a given drug.
What is a trough plasma concentration?
Pharmacokinetic definitions Trough concentration: the concentration of drug in the blood immediately before the next dose is administered, although this does not necessarily represent the lowest concentration during a dosing interval.
What is a true trough?
Isolated trough monitoring, in which the serum concentration is compared against a standard range, is based on the assumption that the measured serum concentration is a true trough, measured at the end of a dosing interval.
When is trough drawn?
A trough level is drawn immediately before the next dose of the drug is administered. A peak level is drawn 1 to several hours after the drug is administered (depending on the drug).
How do you determine peak and trough levels?
To assess drug concentrations during the trough phase, blood should be drawn immediately before the next dose. To assess peak levels, the time for drawing depends on the route of administration: Oral: One hour after drug is taken (assumes a half-life of > two hours) IV: 15-30 minutes after injection/infusion.
What does a trough indicate?
Key Takeaways A trough, in economic terms, can refer to a stage in the business cycle where activity is bottoming, or where prices are bottoming, before a rise. The business cycle is the upward and downward movement of gross domestic product (GDP) and consists of recessions and expansions that end in peaks and troughs.
What is a trough answer?
1. countable noun. A trough is a long narrow container from which farm animals drink or eat. The old stone cattle trough still sits by the main entrance. Synonyms: manger, crib, water trough More Synonyms of trough.
What is a trough in chemistry?
noun. chemistry. a shallow dishlike vessel filled with a liquid, usually water, and used in collecting gases by displacement of liquid from a filled jar held with its open end under the surface of the liquid.
What is peak concentration?
Peak Concentration. A pharmacokinetic measure used to determine drug dosing. Cmax is the highest concentration of a drug in the blood, cerebrospinal fluid, or target organ after a dose is given. Related Term(s)
What is trough phase?
A trough is the stage of the economy’s business cycle that marks the end of a period of declining business activity and the transition to expansion. The business cycle is the upward and downward movement of gross domestic product and consists of recessions and expansions that end in peaks and troughs.
What causes a trough?
A trough is the result of the movements of the air in the atmosphere. In regions where there is upward movement near the ground and divergence at altitude, there is a loss of mass. The pressure becomes lower at this point.
What is a trough in science?
low point is called the trough. For longitudinal waves, the compressions and rarefactions are analogous to the crests and troughs of transverse waves. The distance between successive crests or troughs is called the wavelength. The height of a wave is the amplitude.
What is the use of a trough in a laboratory?
A pneumatic trough is a piece of laboratory apparatus used for collecting gases, such as hydrogen, oxygen and nitrogen. Pneumatic troughs require a liquid such as water. Scientists also have used mercury in pneumatic troughs, but usually only for the collection of water-soluble gases.
What is a trough in waves?
The highest surface part of a wave is called the crest, and the lowest part is the trough. The vertical distance between the crest and the trough is the wave height.
What is a trough concentration in pharmacology?
Trough concentration: the concentration of drug in the blood immediately before the next dose is administered, although this does not necessarily represent the lowest concentration during a dosing interval. •. Minimum concentration (C min ): the lowest concentration of drug in the blood following the administered dose.
What is the meaning of trough level?
Trough level. In medicine and pharmacology, a trough level or trough concentration ( Ctrough) is the lowest concentration reached by a drug before the next dose is administered, often used in therapeutic drug monitoring. The name comes from the idea that on a graph of concentration versus time, the line forms a U-shaped trough at…
What are peaks and troughs in drug monitoring?
Peaks and troughs are the highest and lowest concentrations, respectively, of a medication in an individual’s body. They are used to determine dosing intervals, especially during therapeutic drug monitoring.
What is the relationship between pharmacokinetic parameters and clinical outcome?
There are limited data on the correlation between different pharmacokinetic parameters and clinical outcome for HIV-infected patients. Trough concentration: the concentration of drug in the blood immediately before the next dose is administered, although this does not necessarily represent the lowest concentration during a dosing interval.