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Biomedical subjects

Roland C Merchant

Publications and source records attributed to Roland C Merchant.

7 recordsLinked to original sources
PubMed2025

Brain dynamics reflecting an intra-network brain state is associated with increased posttraumatic stress symptoms in the early aftermath of trauma.

Post-traumatic stress (PTS) encompasses a range of psychological responses following trauma, which may lead to more severe outcomes such as post-traumatic stress disorder (PTSD). Identifying early neuroimaging biomarkers that link brain function to PTS outcomes is critical for understanding PTSD risk. This longitudinal study examines the association between brain dynamic functional network connectivity (dFNC) and current/future PTS symptom severity, and the impact of sex on this relationship. By analyzing 275 participants' dFNC data obtained ~2 weeks after trauma exposure, we noted that brain dynamics of an inter-network brain state link negatively with current (r=-0.197, p corrected = 0.0079) and future (r=-0.176, p corrected = 0.0176) PTS symptom severity. Also, dynamics of an intra-network brain state correlated with future symptom intensity (r = 0.205, p corrected = 0.0079). We additionally observed that the association between the network dynamics of the inter-network and intra-network brain state with symptom severity is more pronounced in female group. Our findings highlight a potential link between brain network dynamics in the aftermath of trauma with current and future PTSD outcomes, with a stronger effect in female group, underscoring the importance of sex differences.

Journal Article↗
PubMed2003

HIV postexposure prophylaxis practices by US ED practitioners.

To determine how often US ED practitioners have prescribed HIV post-exposure prophylaxis (HIV PEP) and to discern how willing they are to offer it to patients, the authors surveyed 600 ED practitioners attending a national conference. According to their self-report, 11% had taken HIV PEP themselves. Sixty-eight percent had prescribed HIV PEP at some time. Of these, 92% had treated needlestick-injured health care workers, 48% sexual assault survivors, and 49% nonhealth care needlestick-injured persons. ED practitioners were more willing to offer HIV PEP after exposures to HIV-infected or high-risk sources than unknown or low- risk sources, as well as after sexual assault than consensual sex. Female practitioners, those who had themselves taken HIV PEP, resident physicians, and ED practitioners with fewer than 6 years of clinical practice were generally more apt to offer HIV PEP. Educational campaigns appear to be necessary to help ED practitioners determine when HIV PEP is appropriate.

Adolescent↗
PubMed2002

Emergency contraception provision: a survey of emergency department practitioners.

OBJECTIVES: To determine emergency department (ED) practitioner willingness to offer emergency contraception (EC) following sexual assault and consensual sex, and to compare responses of practitioners from states whose laws permit the refusal, discussion, counseling, and referral of patients for abortions (often called "opt-out" or "abortion-related conscience clauses") with those of practitioners from states without these laws. METHODS: Using a structured questionnaire, a convenience sample of ED practitioners attending a national emergency medicine meeting was surveyed. RESULTS: The 600 respondents were: 71% male, 29% female; 34% academic, 26% community, and 33% resident physicians; and 7% nurse practitioners and physician assistants. Many respondents (88%) were inclined to offer EC to those sexually assaulted by unknown assailants. More practitioners said they were willing to offer EC if the assailant was known to be HIV-infected rather than if the assailant had low HIV risk factors (90% vs. 79%, p < 0.01). More respondents would prescribe EC after sexual assault than consensual sex (88% vs. 73%, p < 0.01). The rates of willingness to offer EC were the same for practitioners in states with "abortion-related conscience clauses" and those from other states. CONCLUSIONS: Most ED practitioners said they were willing to offer EC. Although the risk of pregnancy exists after consensual sex, practitioners were less willing to prescribe EC after those exposures than for sexual assault. "Abortion-related conscience clauses" did not seem to influence willingness to offer EC.

Adolescent↗