Switching from linear to macrocyclic gadolinium-based contrast agents halts the relative T1 -Weighted signal increase in deep gray matter of children with brain tumors: A retrospective study.

BACKGROUND: Studies have shown signal intensity (SI) changes in the brains of children exposed to repeated doses of a gadolinium-based contrast agent (GBCA). HYPOTHESIS: The trajectory of changes in relative dentate nucleus (DN) and globus pallidus (GP) SI in children receiving multiple doses of GBCA will alter when switched from linear to macrocyclic agents. STUDY TYPE: Retrospective longitudinal. POPULATION: Thirty-five children, age range 0.5-17.0 years, undergoing brain tumor follow-up between 2006 and 2017. FIELD STRENGTH/SEQUENCE: Unenhanced T1 WI, serial scans at both 1.5T and 3T. ASSESSMENT: Regions of interest were drawn on DN, GP, and SIs normalized to middle cerebellar peduncle (DN/MCP) and cerebral white matter (GP/CWM), respectively. A change in SI ratios as a function of dose (slope gradient) calculated according to the type of contrast agent received: linear only, macrocyclic only, or switchover from linear to macrocyclic. For the latter, gradients were compared before and after switchover. The effect of anticancer treatment on slope gradient was tested. STATISTICAL TESTS: One-sample t-test or Mann-Whitney U-test for slope gradients differing from zero. Independent samples t-tests to compare slope gradient groups. Paired sample t-tests to compare slope gradients before and after switchover. RESULTS: A significant (P < 0.05) increase in SI ratio was observed following multiple doses of linear but not macrocyclic agents: mean percentage increase per dose in SI was 0.063% vs. -0.034% for DN/MCP, and 0.078% vs. 0.004% for GP/CWM ratios. A significant (P < 0.05) change of SI trajectory in the DN/MCP ratio was demonstrated when switching from a linear to macrocyclic agent. There was no difference in SI trajectory between patients who had anticancer therapies and those who did not, DN/MCP P = 0.740; GP/BWM P = 0.694. DATA CONCLUSION: Switching from linear to macrocyclic gadolinium-based contrast agents seems to halt the relative T1 signal increase in deep gray matter in children. Anticancer treatments appeared to have no impact on the trajectory of T1 SI. LEVEL OF EVIDENCE: 4 Technical Efficacy: Stage 3 J. Magn. Reson. Imaging 2020;51:288-295.

Rural versus urban pediatric non-accidental trauma: different patients, similar outcomes.

OBJECTIVE: Our aim was to compare urban and rural non-accidental trauma for trends and characterize where injury prevention efforts can be focused. Pediatric trauma patients (age 0-14 years) at two level I adult and pediatric trauma centers, one rural and one urban, were included and data from the trauma registries at each center was abstracted. RESULTS: Of 857 pediatric admissions, 10% of injuries were considered non-accidental. The mean age for all non-accidental trauma patients was significantly lower than the overall pediatric trauma population (2.6 vs. 7.7 years, P < 0.001). Significantly more fatalities occurred in the non-accidental trauma cohort (5.7% vs. 1% P = 0.007). In nearly half of all non-accidental trauma patients, the primary insurance was government programs (49%) and 46% were commercial insurance. The proportion of government insurance in non-accidental trauma was higher in both urban and rural cohorts. There were similar rates of urban and rural patients sustaining non-accidental trauma who were uninsured (6.5 vs. 5.3%). Patients that were younger, in a rural location, and receiving government insurance were at higher risk of non-accidental trauma on univariable analysis. However, only age remained an independent predictor on multivariable analysis.

The Impact of a Universal Decolonization Protocol on Hospital-Acquired Methicillin-Resistant Staphylococcus aureus in a Burn Population.

Hospital-acquired (HA) methicillin-resistant Staphylococcus aureus (MRSA) is a leading cause of HA infections and a significant concern for burn centers. The use of 2% chlorhexidine-impregnated wipes and nasal mupirocin significantly decreases the rate of HA-MRSA in adult intensive care units. The aim of this study was to examine the impact of universal decolonization on the rate of MRSA conversion in an American Burn Association verified adult and pediatric burn center. Universal decolonization protocol consisting of daily chlorhexidine baths and a 5-day course of nasal mupirocin was implemented in the burn unit. MRSA screening both on admission and weekly and contact isolation practices were in place in pre-decolonization and post-decolonization periods. Patient data were analyzed 2 years before and 1 year after implementation of the protocol. The incidence rate of MRSA was significantly decreased after the implementation of the decolonization protocol (11.8 vs 1.0 per 1000 patient days, P < .001). Secondary to the loss of the skin barrier and suppressed immune systems, burn patients are at greater risk for invasive infection leading to severe complications and death. The prevalence of HA-MRSA at our institution's burn center was significantly decreased after the implementation of a universal decolonization protocol.