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 ?
For the objectives of ascertaining feasibility and debugging potential problems, it is important to conduct power analyses to ensure that the pilot study has an adequate sample size to inform the design decisions that need to be made prior to conducting the confirmatory study.
In this case, the pilot study is part of a larger, preceding study.
The pilot study conducted by this researcher suggests the need for a formal investigation of the effectiveness of group video viewing in a comprehension-based video-driven curriculum.
During this second pilot study, a medical chart review by the SLP was undertaken six weeks postrecommendation to: (1) determine when and how snack recommendations were initiated by the nutrition team, since they were not on a medication protocol, and (2) confirm the residents' weights at time of the dysphagia evaluation and their weights following two months of intervention.
Pilot study participants were asked to assess themselves against a selected competency model (a collection of competencies that describes the knowledge, skills and performance abilities needed by an individual with respect to a particular position or job).
We chose metals, volatile organics, pesticides, and polynuclear aromatics for the pilot study because of their toxicity, prevalence in the environment, and relative risk to humans," explained Dr.
The pilot study included candidates 18 years of age and older with known recent histories of CSA.
As part of its system-building effort, First 5 Ventura County funded a pilot study to develop school readiness profiles comprised of children entering kindergarten and their families in four school districts in the fall of 2004.
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.
a leading developer of orthopaedic biomaterials, has completed the initial clinical pilot study in Europe for RHAKOSS Synthetic Bone Spinal Implant.
Now, according to the results of a two-year pilot study conducted by a team of Australian researchers led by Brian Gulson of Macquarie University, antiresorptive therapy may also be useful in warding off the deleterious health effects of elevated blood lead levels by inhibiting lead's release from the skeleton into the bloodstream [EHP 110:1017-1023].
A pilot study conducted by Mangione-Smith examining the relationship between parents' expectations and the prescribing habits of pediatricians showed that parents rarely made direct requests.