The impact of maternal smoking on fast auditory brainstem responses

Deficits in auditory processing have been posited as one of the underlying neurodevelopmental consequences of maternal smoking during pregnancy that leads to later language and reading deficits. Fast auditory brainstem responses were used to assess differences in the sensory processing of auditory stimuli among infants with varying degrees of prenatal cigarette exposure. Maternal report of consumption of cigarettes and blood samples were collected in the hospital to assess exposure levels and participants were then seen at 6-months. To participate in the study, all infants had to pass the newborn hearing exam or a clinically administered ABR and have no known health problems. After controlling for participant age, maternal smoking during pregnancy was negatively related to latency of auditory brainstem responses. Of several potential covariates, only perinatal complications and maternal alcohol use were also related to latency of the ABR responses and maternal smoking level accounted for significant unique variance after controlling for these factors. These results suggest that the relationship between maternal smoking may lead to disruption in the sensory encoding of auditory stimuli.     

选择性κ阿片激动剂K-Ⅱ与U-50488的药理作用比较

K-Ⅱ系k阿片激动剂U-50488的同类物。通过部分离体和整体实验比较了K-Ⅱ与U-50488的药理作用。实验发现,K-Ⅱ抑制电刺激兔输精管收缩的IC₅₀值为0.42 nmol/L,U-50488为26.5 nmol/L;K-Ⅱ抑制小鼠运动功能(横筛法)的ED₅₀值为1.7 mg/g,U-50488为15.3 mg/kg;K-Ⅱ的小鼠LD₅₀值为152.5 mg/kg,U-50488为118.4 mg/g;K-Ⅱ明显降低小鼠自发活动的作用比U-50488强5倍。结果表明,K-Ⅱ是一个药理作用较U-50488强的k受体激动剂。     

Informed choice in cancer pain: empowering the patient

Cancer and palliative care service users can often feel isolated and disempowered. (Tower, 1999). Physical changes, medical interventions and pain can mean that they no longer feel in control of their bodies or their futures. In recognition of this, many health professionals within cancer and palliative care have adopted the mantra of 'patient empowerment', but it is not always clear what it means for either the patients or the professionals. Empowerment is an interactive process that develops and increases power through cooperation, sharing and working together (Marquis and Huston, 2000), and it plays a central role in health professionals' personal and working lives. A person's ability to make decisions and choices demonstrates control of his or her own destiny. This article aims to direct health professionals' participation and involvement in restoring this ability to patients who have pain related to cancer.     

Social network and social support among poor elderly ill in Guadalajara, Mexico

This paper examines social networks and social support among poor elderly ill in Guadalajara, Mexico. We interviewed 40 hospitalized elderly patients. The mean size of social networks was 7.5, basically involving women, multiple generations, and members of the extended family. Emotional support was more frequent than other types of social support. Elderly women had larger social networks and received more social support than men. Married elderly also had larger social networks and more social support than single patients. There were no differences between age and living arrangements with social networks and social support. Future studies are needed on the social and cultural environment of social support for the elderly.     

Closed heart surgery for congenital heart disease in infancy

Closed heart surgery in congenital heart disease can be palliative or corrective. Palliative surgery aims at improving the physiologic deficit rather than the anatomic defect of the heart. Palliative procedures aim to increase pulmonary blood flow in cyanotic children with decreased pulmonary blood flow (Blalock-Taussig shunt), decrease pulmonary blood flow when there is unrestricted flow (pulmonary artery banding), or improve venous mixing in cyanotic children that require pulmonary and systemic venous mixing for survival (atrial septectomy). The indications for palliation over corrective surgery have changed over time. Now we reserve palliation for children that require low pulmonary vascular resistance for correction, a conduit that will require replacement as the child grows, or where the risk of the corrective procedure decreases rapidly with age. For palliation with systemic to pulmonary artery shunts, we prefer to perform a Blalock-Taussig subclavian to pulmonary artery shunt using a synthetic (PTFE) tube graft in infants. The operative mortality is higher in infants under 1 month of age but is not affected by weight or diagnosis. Palliative surgery to decrease pulmonary blood flow is restricted primarily to infants with large left-to-right shunts where the risk of correction in infancy is high (multiple VSDs) or not feasible (univentricular heart). The operative risk for pulmonary artery banding is affected mostly by the complexity of the cardiac defect and the clinical state of the infant (severe congestive failure) at the time of surgery. A trial septectomy to improve venous mixing is used mostly in infants with univentricular heart in whom a balloon septostomy was ineffective.(ABSTRACT TRUNCATED AT 250 WORDS)     

Patterns of exposure of schoolchildren to amplified music

The amplified-music listening habits and the hearing status of 1443 comprehensive schoolchildren have been surveyed by questionnaire. In a stratified sample of them (n = 25), the levels at which they would listen to a personal cassette player (PCP) in various circumstances were measured. The main conclusion drawn was reassuring: that these children seem to be more conservative in their music-listening habits than young people are commonly given credit for. Nevertheless, music may sometimes make a small contribution to socioacusis and to the total noise dosage of those exposed to noise occupationally. Some recommendations are made for manufacturers of PCPs, and for some restrictions on the use of PCPs in occupational noise.     

Torsade de pointes and asystole in a child with complete heart block and prolonged QT interval

Three-year-old girl with eight month history of convulsive syncope due to complete heart block, prolonged QT interval and paroxysms of ventricular tachycardia is described. An episode of torsade de pointes tachycardia followed by asystole was documented. The symptoms and electrocardiographic abnormalities were controlled by pacemaker therapy. The subset of "congenital heart block" patients with prolonged QT interval is at high risk of sudden death and should be regarded as a previously unrecognized form of Romano-Ward syndrome.     

Extending the usable size range of homografts in the pulmonary circulation: outcome of bicuspid homografts

BACKGROUND: Small-sized homografts are often not available, making the use of surgically reduced cryopreserved homograft conduits appealing. METHODS: From January 1993 to January 2000, 21 large homografts were size-reduced by excising one leaflet and were implanted in the pulmonary circulation. Valve function was compared with 21 children-matched for weight, homograft size, and year of operation-who received a standard homograft. RESULTS: Implanted homograft size and patient weight were equivalent in both the bicuspid and standard groups. Median (range) in-hospital peak instantaneous echocardiographic gradient across the valve was 0 mm Hg (0 to 19) in the bicuspid group versus 0 mm Hg (0 to 17) in the standard group (p = 0.65). Median (range) in-hospital pulmonary insufficiency (scale of 0 to 4) was 2 (0 to 3) in the bicuspid group versus 1.5 (0 to 3) in the standard group (n = 10, p = 0.34). At a follow-up of 54+/-29 months there was no significant difference in conduit reinterventions between the groups. CONCLUSIONS: Surgical creation of a bicuspid valve in the pulmonary circulation results in a functionally equivalent conduit compared with standard homograft as measured by early and midterm valve function.