Mild Contralesional Hypothermia Reduces Use of the Unimpaired Forelimb in a Skilled Reaching Task After Motor Cortex Injury in Rats.

Therapeutic hypothermia (TH) mitigates neuronal injury in models of ischemic stroke. Although this therapy is meant for injured tissue, most protocols cool the whole body, including the contralesional hemisphere. Neuroplasticity responses within this hemisphere can affect functional outcome. Thus, cooling the contralesional hemisphere serves no clear neuroprotective function and may instead be detrimental. In this study, we cooled the contralesional hemisphere to determine whether this harms behavioral recovery after cortical injury in rats. All rats were trained on skilled reaching and walking tasks. Rats then received a motor cortex insult contralateral to their dominant paw after which they were randomly assigned to focal contralesional TH (∼33°C) for 1-48, 1-97, or 48-96 hours postinjury, or to a normothermic control group. Contralesional cooling did not impact lesion volume (p = 0.371) and had minimal impact on neurological outcome of the impaired limb. However, rats cooled early were significantly less likely to shift paw preference to the unimpaired paw (p ≤ 0.043), suggesting that cooling reduced learned nonuse. In a second experiment, we tested whether cooling impaired learning of the skilled reaching task in naive rats. Localized TH applied to the hemisphere contralateral or ipsilateral to the preferred paw did not impair learning (p ≥ 0.677) or dendritic branching/length in the motor cortex (p ≥ 0.105). In conclusion, localized TH did not impair learning or plasticity in the absence of neural injury, but contralesional TH may reduce unwanted shifts in limb preference after stroke.

Parents' Perspectives on Navigating the Work of Speaking Up in the NICU.

OBJECTIVE: To describe parents' perspectives and likelihood of speaking up about safety concerns in the NICU and identify barriers and facilitators to parents speaking up. DESIGN: Exploratory, qualitatively driven, mixed-methods design. SETTING: A 50-bed U.S. academic medical center, open-bay NICU. PARTICIPANTS: Forty-six parents completed questionnaires, 14 of whom were also interviewed. METHODS: Questionnaires, interviews, and observations with parents of newborns in the NICU were used. The qualitative investigation was based on constructivist grounded theory. Quantitative measures included ratings and free-text responses about the likelihood of speaking up in response to a hypothetical scenario about lack of clinician hand hygiene. Qualitative and quantitative analyses were integrated in the final interpretation. RESULTS: Most parents (75%) rated themselves likely or very likely to speak up in response to lack of hand hygiene; 25% of parents rated themselves unlikely to speak up in the same situation. Parents engaged in a complex process of Navigating the work of speaking up in the NICU that entailed learning the NICU, being deliberate about decisions to speak up, and at times choosing silence as a safety strategy. Decisions about how and when to speak up were influenced by multiple factors including knowing my baby, knowing the team, having a defined pathway to voice concerns, clinician approachability, clinician availability and friendliness, and clinician responsiveness. CONCLUSION: To engage parents as full partners in safety, clinicians need to recognize the complex social and personal dimensions of the NICU experience that influence parents' willingness to speak up about their safety concerns.

Examining potential side effects of therapeutic hypothermia in experimental intracerebral hemorrhage.

Studies treating intracerebral hemorrhage (ICH) with therapeutic hypothermia (TH) have shown inconsistent benefits. We hypothesized that TH's anti-inflammatory effects may be responsible as inflammatory cells are essential for removing degrading erythrocytes. Here, we subjected rats to a collagenase-induced striatal ICH followed by whole-body TH (∼33℃ for 11-72 h) or normothermia. We used X-ray fluorescence imaging to spatially quantify total and peri-hematoma iron three days post-injury. At three and seven days, we measured non-heme iron levels. Finally, hematoma volume was quantified on one, three, and seven days. In the injured hemisphere, total iron levels were elevated ( p < 0.001) with iron increasing in the peri-hematoma region ( p = 0.007). Non-heme iron increased from three to seven days (p < 0.001). TH had no effect on any measure of iron ( p ≥ 0.479). At one and three days, TH did not affect hematoma volume ( p ≥ 0.264); however, at seven days there was a four-fold increase in hematoma volume in 40% of treated animals ( p = 0.032). Thus, even when TH does not interfere with initial increases in total and non-heme iron or its containment, TH can cause re-bleeding post-treatment. This serious complication could partly account for the intermittent protection previously observed. This also raises serious concerns for clinical usage of TH for ICH.

Parents' perspectives on safety in neonatal intensive care: a mixed-methods study.

BACKGROUND & OBJECTIVES: Little is known about how parents think about neonatal intensive care unit (NICU) safety. Due to their physiologic immaturity and small size, infants in NICUs are especially vulnerable to injury from their medical care. Campaigns are underway to integrate patients and family members into patient safety. This study aimed to describe how parents of infants in the NICU conceptualise patient safety and what kinds of concerns they have about safety. METHODS: This mixed-methods study employed questionnaires, interviews and observation with parents of infant patients in an academic medical centre NICU. Measures included parent stress, family-centredness and types of safety concerns. RESULTS: 46 parents completed questionnaires and 14 of these parents also participated in 10 interviews (including 4 couple interviews). Infants had a range of medical and surgical problems, including prematurity, congenital diaphragmatic hernia and congenital cardiac disease. Parents were positive about their infants' care and had low levels of concern about the safety of procedures. Parents reporting more stress had more concerns. We identified three overlapping domains in parents' conceptualisations of safety in the NICU, including physical, developmental and emotional safety. Parents demonstrated sophisticated understanding of how environmental, treatment and personnel factors could potentially influence their infants' developmental and emotional health. CONCLUSIONS: Parents have safety concerns that cannot be addressed solely by reducing errors in the NICU. Parent engagement strategies that respect parents as partners in safety and address how clinical treatment articulates with physical, developmental and emotional safety domains may result in safety improvements.