jueves, 16 de enero de 2014

Silent Victims — An Epidemic of Childhood Exposure to Domestic Violence — NEJM

Silent Victims — An Epidemic of Childhood Exposure to Domestic Violence — NEJM


Silent Victims — An Epidemic of Childhood Exposure to Domestic Violence

Megan Bair-Merritt, M.D., M.S.C.E., Barry Zuckerman, M.D., Marilyn Augustyn, M.D., and Peter F. Cronholm, M.D., M.S.C.E.
N Engl J Med 2013; 369:1673-1675October 31, 2013DOI: 10.1056/NEJMp1307643
Since August 2012, the Affordable Care Act has required private insurance companies to cover routine screening and counseling for intimate partner violence (IPV) as an essential health service for women at no additional cost to the patient. This requirement reflects recent, evidence-based recommendations from the Institute of Medicine and the U.S. Preventive Services Task Force and represents important forward movement in mitigating the health effects of IPV.
Discussions about health care providers' role in IPV screening and intervention, however, often fail to consider the profound effects of childhood exposure to IPV — an omission that renders these children silent victims. Although the prevalence and adverse health consequences of such childhood exposure are well researched, this public health problem is rarely emphasized. More than 15 million children in the United States live in families in which IPV occurs, and approximately 7 million of them witness severe violence, such as a parent using a weapon in the assault of the other parent.1Children can be directly exposed to IPV (e.g., present in the room where the violence is occurring) or indirectly exposed — that is, affected by effects of the violence (e.g., maternal depression, trauma symptoms, or changes in parenting).
Childhood IPV exposure has been repeatedly linked to higher rates of myriad physical health problems in children. Altered neuroendocrine stress response may be one important mechanism accounting for this correlation. Highly stressful environmental exposures, such as exposure to IPV, cause children to repeatedly mount the “fight or flight” reaction. Although this response may be adaptive in the short term, repeated activation of the autonomic nervous system and hypothalamic–pituitary–adrenal (HPA) axis results in pathologic changes in multiple systems over time; some experts refer to this effect as the biologic embedding of stress.2
For example, childhood exposure to IPV increases both the incidence and severity of childhood asthma by means of a mechanism related to chronic activation of the HPA axis.2 Specifically, such chronic activation and the associated cortisol release may lead to an excess of type 2 helper T (Th2) cells relative to type 1 helper T (Th1) cells, which can in turn lead to airway inflammation and hyperreactivity, thereby increasing the risk of an onset of asthma.2 In addition, white cells may compensate for a stress-related excess of cortisol by down-regulating glucocorticoid receptors. In support of this theory, Miller and Chen have reported that asthmatic children who experienced acute and chronic stress had significantly lower expression of glucocorticoid-receptor mRNA than asthmatic children who did not have such stress.3 Diminished glucocorticoid responsivity can lead to excessive inflammatory response, increased airway reactivity, and decreased efficacy of glucocorticoid medications, which could have major implications for maintaining asthma control and treating asthma exacerbations.3
Social and emotional health are similarly adversely affected by childhood IPV exposure, and the mechanism underlying these effects is also related to the biologic embedding of stress. According to a meta-analysis, 63% of child witnesses of IPV had worse emotional health than the average child.4 Early childhood represents the greatest period of vulnerability to stress-related changes in the brain, because of the tremendous brain growth that occurs during this period. For example, childhood IPV exposure affects the usual pruning of infants' neurocircuitry, leading to overrepresentation of the fear-driven limbic system and underdevelopment of areas of interpretive functioning, such as the frontal and prefrontal cortexes.5 In addition, increased cortisol levels can result in hippocampal neuron loss and damage as well as associated learning problems and harm to emotional health.
We believe that the health care community's primary role in this arena should include early identification and treatment to prevent or ameliorate the negative effects of IPV on developing biologic systems. The ability of pediatric clinicians to prevent or treat child health problems will be stymied if IPV is not adequately addressed; adult clinicians must recognize that a person's lifelong health trajectory is established in childhood and that efforts to improve the health of children will therefore ultimately improve the health of their future patients. When mothers who have experienced IPV are identified in adult medicine settings, clinicians should thoughtfully include in their plans strategies for addressing the needs of exposed children. For example, they might discuss with mothers positive parenting techniques, since a secure relationship with a primary caregiver is a critical buffer for the stress of childhood IPV exposure.
Within pediatrics, the American Academy of Pediatrics supports routine IPV screening at the time of well-child visits. Screening can be conducted by clinicians or by means of written or computer-based approaches. Screening questions and procedures mirror those used in adult medicine, with one notable exception. Abused women have expressed concern that verbal children who are 3 years old or older may be traumatized by direct discussions of IPV in their presence — or that they may later inadvertently repeat these conversations to the perpetrator. Therefore, when caring for mothers with older children, clinicians have the option of screening the mother alone (e.g., during hearing and vision screening) or using more general questions, such as “How do you and your partner work out arguments?” and “In general, how would you describe your relationship with your partner: a lot of tension, some tension, or no tension?”
When the occurrence of IPV is disclosed, hospital and community IPV programs are essential partners that can help clinicians and their patients develop sound management plans that protect women and children's safety and abide by state-specific reporting laws. Reporting laws for both IPV and childhood exposure to IPV vary among states, and certain situations may need to be reported to the police, child protective services, or both; consultation with local IPV advocates or hospital-based IPV–child protection teams are important in decision making, since these situations are often nuanced and the safety of both women and children must be carefully considered. When it's appropriate, children should be referred to available mental health care providers who are informed about trauma care. There are evidence-based interventions for childhood exposure to IPV, such as trauma-focused cognitive behavioral therapy, that effectively reduce children's trauma symptoms, but too often these therapies are not accessible at the community level. Continued advocacy to expand the availability of these programs is essential.
The health care system has effectively tackled critical health problems and led the charge to address many public health problems. We now have the opportunity and obligation to identify women and children who are experiencing IPV and to promote evidence-based interventions to prevent, or at least attenuate, the health consequences of childhood IPV exposure.
Disclosure forms provided by the authors are available with the full text of this article at NEJM.org.


From the Department of Pediatrics, Johns Hopkins Medical Center, Baltimore (M.B.-M.); the Department of Pediatrics, Boston Medical Center and Boston University School of Medicine, Boston (B.Z., M.A.); and the Department of Family Medicine and Community Health, University of Pennsylvania, Philadelphia (P.F.C.).

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