Figure 5b. Time from the administration of the first sedation medication until the patient was adequately sedated for MR imaging. (a) Quality control chart shows the mean total procedure time (xbar plot) for the three nursing groups. All paired differences are statistically significant (P < .001). The mean time is 24.9 minutes (solid horizontal line). (b) Quality control chart shows the variability of the SD (Std. Dev.) (sbar plot) for the three nursing groups. Lower procedure times, as well as less variability, are present in nursing group A. In a and b, group A: Four sedation nurses perform the majority (76%) of procedures. Group B: Sixteen other sedation nurses with less dedicated time perform the MR sedation (23% of procedures). Floor: Sedation procedures performed by nurses accompanying patients from the wards (1% of procedures). Control limits (dashed horizontal lines) indicated at 3
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