pilot study

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a careful examination of a phenomenon; see also design.
cohort study prospective study.
cross-sectional study one employing a single point of data collection for each participant or system being studied. It is used for examining phenomena expected to remain static through the period of interest. It contrasts with a longitudinal s.
electrophysiological s's (EPS) studies from within the heart of its electrical activation and response to electrical stimuli and certain drugs. In general they include intravenous and/or intra-arterial placement of one or more electrode catheters at sites in the atria, ventricles, or coronary sinus, and sometimes the pulmonary artery or aorta. They record activity or stimulate the heart at various rates and cadences and are aids in the evaluation of electrophysiologic properties such as automaticity, conduction, and refractoriness. They also initiate and terminate tachycardias, map the sequence of activation, and aid in evaluation of patients for various forms of therapy and for the response to therapy. During these studies catheter ablation procedures, such as radio frequency ablation and electrical ablation, may be performed.
flow study uroflowmetry.
longitudinal study one in which participants, processes, or systems are studied over time, with data being collected at multiple intervals. The two main types are prospective studies and retrospective studies. It contrasts with a cross-sectional s.
pilot study a smaller version of a proposed research study, conducted to refine the methodology of the later one. It should be as similar to the proposed study as possible, using similar subjects, the same setting, and the same techniques of data collection and analysis.
prospective study an epidemiologic study in which the groups of individuals (cohorts) are selected on the bases of factors that are to be examined for possible effects on some outcome. For example, the effect of exposure to a specific risk factor on the eventual development of a particular disease can be studied. The cohorts are then followed over a period of time to determine the incidence rates of the outcomes being studied as they relate to the original factors in question. Called also cohort study.

The term prospective usually implies a cohort selected in the present and followed into the future, but this method can also be applied to existing longitudinal historical data, such as insurance or medical records. A cohort is identified and classified as to exposure to the risk factor at some date in the past and followed up to the present to determine incidence rates. This is called a historical prospective study, prospective study of past data, or retrospective cohort study.
retrospective study an epidemiologic study in which participating individuals are classified as either having some outcome (cases) or lacking it (controls); the outcome may be a specific disease, and the persons' histories are examined for specific factors that might be associated with that outcome. Cases and controls are often matched with respect to certain demographic or other variables but need not be. As compared to prospective studies, retrospective studies suffer from drawbacks: certain important statistics cannot be measured, and large biases may be introduced both in the selection of controls and in the recall of past exposure to risk factors. The advantage of the retrospective study is its small scale, usually short time for completion, and its applicability to rare diseases, which would require study of very large cohorts in prospective studies. See also prospective s.
urinary flow study uroflowmetry.
voiding pressure study simultaneous measurement of bladder contraction, urinary flow, and sphincter electromyogram.

pilot study

a small, preliminary version of a proposed research study, conducted to refine the methodology of subsequent studies.

pilot study

Pilot project Medtalk A preliminary study designed to evaluate the effect of a particular change in policy. See CHIP.

pilot study,

n the early or initial study for a new medicine or method of medical treatment.
References in periodicals archive ?
Therefore, the present work aims to address the most important methodological issues together and trying hard to give the researchers, especially for those who are not well-established in research method and thirsty for such issues, the best recommended practices when conducting a pilot study and before conducting the main one.
To satisfy the requirements for the Pilot Study DOMA will retrieve the medical records from the private healthcare provider in multiple formats (mail, fax, scanned), convert the documents into a Portable Document Format (pdf) and then make the records available to the VBA through DOMA's secure iCHART application.
The purpose of this pilot study was to identify the best listening task format and the optimal number of items for inclusion in viewing guides.
The purpose of the second pilot study was to determine the efficacy of snack recommendations without the benefit of using a medication protocol to ensure their achievement.
Scientifically rigorous studies are needed to establish DH as an effective intervention for chronic diseases, and the design of a future investigation should be double-blind and randomized to control for expectation or placebo effects which could not be ruled out in the reported pilot study.
Despite this unrealistically brief period during the traditional "busy" season, about 65 CPAs completed the pilot study.
Lead and arsenic will be the primary focus of the pilot study, but researchers will also gather information about the exposure of individuals to benzene and other volatile organic compounds.
The students with the mutant gene appeared to escape the deletrious effects of eating lots fo dietary cholesterol, at least in this pilot study, Weinberg says.
professor of internal medicine and director of cardiovascular medicine at The Ohio State University, and co-principal investigator of the global pilot study.
March 11 /PRNewswire/ -- Makers of a new liquid natural supplement formulation of Cetyl-Myristoleate (CMO) are seeking osteoarthritis and fibromyalgia patients for a pilot study in Phoenix beginning Monday, April 12, 2010.
The pilot study, "The effect of HMRlignan on mammalian lignan and estrogen metabolite levels in post-menopausal women: A randomized, double-blind, single dummy, parallel group, pilot study," led by Jay Udani, MD, and Mary Hardy, MD, from Medicus Research in Northridge, CA, analyzed changes in enterolactone levels and estrogen metabolites following ingestion of the plant lignan hydroxymatairesinol (HMR) and found significant improvement in reported hot flashes by the study participants.
In Arizona, the governor recently signed a bill authorizing a two-year pilot study using CNAs trained as medication technicians in SNFs' nonskilled, or "custodial," units.