If Kepler’s laws define the motion of the planets, Newton’s laws define motion. It was this law that inspired Newton, who came up with three laws of his own to explain why the planets move as they do. Kepler’s third law shows that there is a precise mathematical relationship between a planet’s distance from the Sun and the amount of time it takes revolve around the Sun. This discovery (which became Kepler’s second law of orbital motion) led to the realization of what became Kepler’s first law: that the planets move in an ellipse (a squashed circle) with the Sun at one focus point, offset from the center. For all these triangles to have the same area, the planet must move more quickly when it is near the Sun, but more slowly when it is farthest from the Sun. If you draw a triangle out from the Sun to a planet’s position at one point in time and its position at a fixed time later-say, 5 hours, or 2 days-the area of that triangle is always the same, anywhere in the orbit. For many years, he struggled to make Brahe’s observations of the motions of Mars match up with a circular orbit.Įventually, however, Kepler noticed that an imaginary line drawn from a planet to the Sun swept out an equal area of space in equal times, regardless of where the planet was in its orbit. Further study of PDAs in information systems is warranted before they are widely adopted.Like many philosophers of his era, Kepler had a mystical belief that the circle was the Universe’s perfect shape, and that as a manifestation of Divine order, the planets’ orbits must be circular. The use of our PDA-based point-of-care patient record and charting system showed a modest benefit in reducing the number of documentation discrepancies in resident daily-progress notes. When using the PDA system, there were no significant changes in the numbers of notes with documentation discrepancies of medications (27.7%-17.1% of notes OR: 0.63 95% CI: 0.35-1.13) or vascular lines (33.6%-36.1% of notes OR: 1.11 95% CI: 0.66-1.87).
When controlling for covariates in the regression, there were significantly fewer documentation discrepancies of patient weights in notes written by using the PDA system (14.4%-4.4% of notes odds ratio : 0.29 95% confidence interval : 0.15-0.56). Logistic and Poisson regression were used in analyses to control for potential confounding factors.Ī total of 339 progress notes in the baseline period and 432 progress notes in the intervention period were reviewed. Using predefined reference standards, we determined the accuracy of recorded information for patient weights, medications, and vascular lines. We analyzed all resident daily-progress notes from 40 randomly selected days over 4 months in both the baseline and intervention periods. Our intervention was a PDA-based patient record and charting system used by all NICU resident physicians over the study period.
#DISCREPANCIES IN PERFECT ASSISTANT TRIAL#
We conducted a before-and-after trial in an academic NICU. To determine whether a point-of-care personal digital assistant (PDA)-based patient record and charting system could reduce the number of resident progress-note documentation discrepancies in a neonatal intensive care unit (NICU). To what extent information systems can decrease such discrepancies is unknown. We recently found documentation discrepancies in 60% of resident daily-progress notes with respect to patient weight, medications, or vascular lines.
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