We carried out a comparative analysis of the prospective recorded data on a consecutive series of 182 total knee replacements (95 Kinematic and 87 Kinemax plus knees) performed between 1991 and 1993.
At these time points pulmonary capillary wedge pressure, cardiac index and SvO2 were measured and actual values of continuously measured haemodynamic parameters (StO2, heart rate, arterial, pulmonary arterial, central venous pressure) were prospective recorded.
Accordingly, we estimated the magnitude of the depression use associations in relation to key covariates based on prospective records of mental health visits to physicians.
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In order to analyze the possible utilization of the tantalum screw in the femoral hip osteonecrosis, we have performed an observational study, with prospective record of hip scores and retrospective analysis of imaging studies.
The use of prospective recording of headaches over shorter and longer time periods is likely to reduce such a bias and produce more reliable and valid estimates than global single retrospect reports of varying intervals.
Strengths of this study are the daily prospective recording of sedative, analgesic, and NMB administration in relation to carefully protocolized ventilation strategies, and real-time assessment of perceived patient comfort associated with these exposures during the conduct of a trial.
As expected, the agreement is low between retrospective information sources such as questionnaires and interviews compared to prospective recording in diaries on estimates of headache and chronic pain prevalence among children in community populations [13 15].
A study design should strive for prospective recording of drug intake during pregnancy, comparison to appropriate control groups adjusted for inherited traits, and single drug exposures for evaluation of specific syndromic causation, such as the Fetal Hydantoin Syndrome.
In a few comparative studies of children and adolescents in community samples, the agreement has been found to be low between retrospective information in questionnaires and interviews compared to prospective recording in diaries on estimates of headache prevalence and various characteristics such as severity, frequency, intensity and duration of episodes [11, 13, 14].
These diaries, which are filled in at home by the patients and returned at follow-up visits, allow prospective recording of the characteristics of every attack and therefore more accurate descriptions of the disease; they also make it possible to confirm and/or distinguish between different types of headache in subjects with coexisting forms.
