placebo effect


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effect

 [ĕ-fekt´]
a result produced by an action.
additive effect the combined effect produced by the action of two or more agents, being equal to the sum of their separate effects.
adverse effect a symptom produced by a drug or therapy that is injurious to the patient.
Bainbridge effect Bainbridge reflex.
Bohr effect decreased affinity of hemoglobin for oxygen caused by an increase of carbon dioxide; the oxyhemoglobin dissociation curve is displaced to the right because of higher partial pressure of carbon dioxide and lower pH. See also Haldane effect.
The Bohr effect causing a shift to the right in the oxyhemoglobin dissociation curve.
Crabtree effect the inhibition of oxygen consumption on the addition of glucose to tissues or microorganisms having a high rate of aerobic glycolysis; the converse of the Pasteur effect.
cumulative effect the action of a drug or treatment resulting from repeated use.
Doppler effect see doppler effect.
experimenter e's demand characteristics.
extrapyramidal e's the side effects caused by neuroleptic medications, including dystonias, parkinsonism, akathisia, and tardive dyskinesia.
Haldane effect increased oxygenation of hemoglobin promotes dissociation of carbon dioxide; see also Bohr effect.
Hawthorne effect a psychological response in which the subjects in a research study change their behavior simply because they are subjects in a study, not because of the research treatment.
heel effect variation in x-ray beam intensity and projected focal spot size along the long axis of the x-ray tube from cathode to anode.
parallax effect the position of the image on each emulsion of dual emulsion film; it is accentuated by tube-angled x-ray techniques.
Pasteur effect the decrease in the rate of glycolysis and the suppression of lactate accumulation by tissues or microorganisms in the presence of oxygen.
photoelectric effect ejection of electrons from matter as a result of interaction with photons from high frequency electromagnetic radiation, such as x-rays; the ejected electrons may be energetic enough to ionize multiple additional atoms.
placebo effect the total of all nonspecific effects, both good and adverse, of treatment; it refers primarily to psychological and psychophysiological effects associated with the caregiver-patient relationship and the patient's expectations and apprehensions concerning the treatment. See also placebo.
position effect in genetics, the changed effect produced by alteration of the relative positions of various genes on the chromosomes.
pressure effect the sum of the changes that are due to obstruction of tissue drainage by pressure.
proarrhythmic effect any new, more advanced form of arrhythmia caused by an antiarrhythmic agent, especially those that produce hemodynamically important symptoms. These arrhythmias occur less than 30 days after initiation of treatment and are not due to a new event such as acute myocardial infarction or hypokalemia.
side effect a consequence other than that for which an agent is used, especially an adverse effect on another organ system.
Somogyi effect see somogyi effect.

placebo effect

n.
The beneficial effect in a patient following a particular treatment that arises from the patient's expectations concerning the treatment rather than from the treatment itself.
Alternative medicine A desired self-healing force released by the mind-body connection
EBM The bias introduced in a study when the patient believes he/she is getting the drug being tested when not, and vice versa
Psychiatry The effect that an inactive or inert substance has on a clinical condition

placebo effect

Placebo response Psychiatry The effect that an inactive or inert substance has on a clinical condition. See Biofeedback, 'Halo' effect, Hawthorne effect, Placebo, Placebo response; Cf 'Nocebo. '.

placebo effect

The often significant, but usually temporary, alteration in a patient's condition, following the exhibition of a drug or other form of treatment, which is due to the patient's expectations or to other unexplained psychological effects, rather than to any direct physiological or pharmacological action of the drug or treatment. The placebo effect has done much to foster the reputation of many valueless forms of treatment.

Placebo effect

Placebo effect occurs when a treatment or medication with no known therapeutic value (a placebo) is administered to a patient, and the patient's symptoms improve. The patient believes and expects that the treatment is going to work, so it does. The placebo effect is also a factor to some degree in clinically-effective therapies, and explains why patients respond better than others to treatment despite similar symptoms and illnesses.
Mentioned in: Biofeedback

pla·ce·bo ef·fect

(plă-sēbō e-fekt)
A response when a treatment or medication with no known therapeutic value is administered to a patient and the patient's symptoms improve due to their belief that the treatment is effective.
References in periodicals archive ?
Woollacott believes that 'the placebo effect will eventually be explained within a scientific framework, but first, that framework must be expanded to include the possibility that something as intangible as one's belief can directly alter the structure and function of the body.'
In MET treatment group, the placebo effect led to a nonsignificant HbA1c change of 0.127% (95% CI , −0.360-0.613%; P = 0.610) in Caucasian population and also a nonsignificant HbA1c change of 0.140% (95% CI , −1.330-1.611%; P = 0.852) in Asian population.
Wickramasekera, "A conditioned response model of the placebo effect," Biofeedback and Self-Regulation, vol.
It is very much likely that low-challenge (low-subjective-importance) artificial research conditions do not give rise to placebo effects, which may influence one's exercise performance, or--in accord with past research with holographic bracelets--the bracelet used in the current study could have been perceived as too "weak" to yield a detectable placebo effect.
(23) Patients who received open-label placebo were educated about the placebo effect and shown a film clip describing promising results of a prior open-label placebo study.
Placebo effects are not supposed to be a constant phenomenon rather they depend on various neurobiological, genetic and epigenetic factors and hence vary from person to person.
They call for further studies evaluating the potential for "harnessing placebo effects without deception," for back pain as well as other conditions.
The potency of placebo effects coupled with the overuse of opioid painkillers has given rise to the idea of using "fake' pills for pain (Merchant, 2016).
It is believed that the placebo effect contributes in a smaller or larger form within any therapy, and can potentiate the pharmacological effect of the active substance.
Regardless of this necessary improvement, as long as the common and widespread use of these bibliometric indicators in a institutional and governmental level, their placebo effect in some behaviors of many investigators will be inevitable.
The placebo effect was first noted in studies in the areas of clinical medicine and pharmacology, and basically consists of the ability of inert products to produce effects because of the user's belief in their efficacy.
Many of you probably know about the placebo effect. It's the idea that giving a patient an ineffective treatment - such as a sugar pill - for their condition might actually produce beneficial effects.