Strategies, guidelines, policies and standards: the search for direction in community health promotion

In this paper, the authors respond on behalf ofa panel representingthe American Public Health Association in the USA to criticismsfrom Canada (by Higgins and Green, two health education researchersfrom British Columbia) regarding the relevance and adequacyof a set of criteria developed in the USA for guiding the developmentof health promotion programs in other developed countries, suchas Canada. The US criteria included a specific focus on riskfactors of disease or untoword health conditions, the characteristicsof an intervention's target group(s), the appropriateness ofan interivention for a given target group or socio-culturalsituation, the optimum use of available resources, and the abilityto evaluate intervention effects. The Canadian criticisms were that these criteria do not allowforor give proper appreciation to the process through which communitiescoalesce around specific problems or issues of importance to‘health’, and there is strong exception taken tothe focus by US groups on ‘risk factor reduction’.There is a preference among Canadians for the tenn ‘riskcondition’, which is defined as ‘local conditionshaving an impact on the health of neighborhoods’. Through a series of case illustrations, the Canadian authorsattempt to show the narrowness of the US criteria, thereforearguing for a broader set of criteria which would allow fora programatic focus on community-based health problems whichare not ‘"carefully deflned measureable, modifiable" riskfac tors’. In response, the authors of this paper argue that their Canadiancritics have misinterpreted the purpose and utility of the APHAguidelines, therefore over-interpreting the implications ofthese criteria for the specific Canadian community health promotioninitiatives they hoped to evaluate. The conclusion reached isthat the APHA criteria continue to represent a useful approachto guiding the consideration of pos sible health promotion investmentson the part of communities or organizations.     

Comparison of Two Myoepicardial Pacemaker Leads: Follow-up in 80 Children, Adolescents, and Young Adults

Although several types of commercially available epicardial leads exist, few postimplantation data have been reported. To compare "screw-in" (6917-35) leads with "stab-on" leads (4951-35) from the same manufacturer, we reviewed the records of 80 young patients (age 8 days to 29 years) who underwent ventricular epicardial pacemaker implantation from 1973 to 1986. Follow-up for the 57 patients with the 6917-35 model ranged from 3 months to 17 years (median 6.5 years) and for the 23 patients with the 4951-35 model 9 days to 4.25 years (median 2.0 years). Actuarial life table analysis revealed significantly (P less than 0.001) fewer 4951-35 leads were functioning at each of 1-5 years after implant, compared to the 6917-35 leads. Analysis of available threshold pulse width data revealed no difference (P = 0.08) acutely (6 weeks after implant), but a significantly (P = 0.05) higher mean threshold for the 4951-35 leads was found chronically. No significant correlation was found for lead failure with age, underlying heart disease, lead site (i.e., left or right ventricle), or surgical approach. Using the sutureless, stab-on technique, the 4951-35 lead is associated with higher thresholds and lower survival rate when compared to the 6917-35 lead.     

Factors Influencing Pacemaker Generator Longevity: Results from the Complete Automatic Pacing Threshold Utilization Recorded in the CAPTURE Trial

Objectives: The CAPTURE study evaluated the accuracy of automated atrial and right ventricular (RV) threshold algorithms. Background: Modern pacemakers include many added features designed to improve the ease of patient follow‐up, as well as algorithms to reduce pacing outputs and/or reduce the atrial or ventricular pacing percentages, thus improving longevity. Methods: Automated atrial and RV threshold measurements were assessed versus manual measurements at 6 months. The projected longevity was assessed and compared between subjects with the threshold‐tracking feature On versus Off. In addition, the projected longevity effect of device features to reduce atrial pacing and reduce ventricular pacing, and device characteristics such as battery size and high impedance leads (≥1,000 ohms), was investigated. Results: Atrial and RV manual versus automatic measurements were equivalent in 683 of 691 subjects (98.8%) and 736 of 746 subjects (98.7%), respectively. Thresholds were stable with 99.6% of atrial and 99.2% of RV consecutive measurements within ±0.25V. Algorithms for threshold tracking, reducing ventricular pacing, and reducing atrial pacing were associated with 0.8, 0.9, and 0.2 years projected longevity improvements. High impedance leads were associated with a 0.8‐year projected longevity improvement. Approximately 2 years of longevity improvement was projected for a 1‐cc increase in device size. Conclusions: The atrial and RV algorithms were accurate and reliable in all leads tested. Threshold tracking, reduced ventricular pacing, and high impedance leads result in increased device longevity. Battery capacity was the strongest determinant of increased projected longevity. (PACE 2010; 33:1020–1030)     

Programmed Atrial Sensitivity: A Critical Determinant in Atrial Fibrillation Detection and Optimal Automatic Mode Switching

Automatic mode switching (AMS) prevents tracking of paroxysmal atria] fibrillation (AF) in dual chamber pacing. The correct detection of AF can be affected by the programmed atrial sensitivity (AS). We prospectively studied the relationship between AS, AF under-sensing, an d AMS, using unfiltered bipolar in tracardiac atrial electrogram s recorded from 17 patients during sinus rhythm (SR) and in AF. Overall, 780 rhythms were recorded and replayed onto three dual chamber pacemaker models using different AMS algorithms (Thera DR 7940, Marathon DDDB 294–09, and Meta DDDH 1254), and the ventricular responses were measured. AS was randomly programmed in steps from the highest available AS to half of the mean atrial P wave amplitude (PWA), and the percentage of appropriate AMS responses (defined as a ventricular pacing rate at the expected AMS mode) were recorded. AMS efficacy was related to the programmed AS settings in an exponential manner. At low AS settings, a higher percentage of tests were associated with absence of, or with intermittent AMS and tracking of AF, whereas at higher AS, oversensing of noise during SR occurred. An optimal AS measured approximately 1.3 mV, representing about one-third of the PWA measured during SR, although oversensing of SR and undersensing of AF continued to occur in 14% of tests and time, respectively, due to the high variation in PWA during AF. Thus, a fixed AS cannot eliminate AF undersensing without inviting noise oversensing, suggesting the need for automatic adjustments of AS, or the use of a rate-limiting algorithm to prevent rate oscillation during intermittent AF sensing. In conclusion, AMS functions of existing pacemakers were significantly limited by the undersensing of AF and oversensing of noise. Proper adjustment of the AS is important to enable effective AMS during AF.     

The anatomy of language: contributions from functional neuroimaging

This article illustrates how functional neuroimaging can be used to test the validity of neurological and cognitive models of language. Three models of language are described: the 19th Century neurological model which describes both the anatomy and cognitive components of auditory and visual word processing, and 2 20th Century cognitive models that are not constrained by anatomy but emphasise 2 different routes to reading that are not present in the neurological model. A series of functional imaging studies are then presented which show that, as predicted by the 19th Century neurologists, auditory and visual word repetition engage the left posterior superior temporal and posterior inferior frontal cortices. More specifically, the roles Wernicke and Broca assigned to these regions lie respectively in the posterior superior temporal sulcus and the anterior insula. In addition, a region in the left posterior inferior temporal cortex is activated for word retrieval, thereby providing a second route to reading, as predicted by the 20th Century cognitive models. This region and its function may have been missed by the 19th Century neurologists because selective damage is rare. The angular gyrus, previously linked to the visual word form system, is shown to be part of a distributed semantic system that can be accessed by objects and faces as well as speech. Other components of the semantic system include several regions in the inferior and middle temporal lobes. From these functional imaging results, a new anatomically constrained model of word processing is proposed which reconciles the anatomical ambitions of the 19th Century neurologists and the cognitive finesse of the 20th Century cognitive models. The review focuses on single word processing and does not attempt to discuss how words are combined to generate sentences or how several languages are learned and interchanged. Progress in unravelling these and other related issues will depend on the integration of behavioural, computational and neurophysiological approaches, including neuroimaging.     

AIDS and the transition to illicit drug injection—results of a randomized trial prevention program

Illicit drug injection is a major component of the AIDS epidemic in the United States, Europe and some developing countries. Prevention of illicit drug injection would not only reduce HIV transmission but would also reduce the other health, psychological and social problems associated with illicit drug injection. One hundred and four subjects who were using heroin intranasally (‘sniffing’) were recruited for a study of the transition to drug injection. Eligibility criteria included sniffing as the most frequent route of administration and no more than 60 injections in the past 2 years. All subjects received thorough basic information about AIDS, including HIV antibody test counseling. Subjects were then randomly assigned to a four-session social learning based AIDS/drug injection prevention program or a control condition. Eighty-three subjects were successfully followed at a mean time of 8.9 months. Twenty (24%) of the followed subjects reported injecting illicit drugs during the follow-up period. Drug injection during follow-up was associated with being in the control group, intensity of non-injected drug use, prior injection, and having close personal relationships with current intravenous (IV) drug users.     

The Biophysical Profile: Antepartal Assessment of Fetal Well Being

The assessment of fetal well-being is a primary consideration for perinatal nurses. The biophysical profile is a clinical evaluation of the status of the fetus based on assessment of multiple discrete variables. This article describes current biophysical profile scoring systems, the physiologic basis of the fetal variables, and factors that may affect the variables. It also discusses issues related to future applications and refinement of the biophysical profile, as well as nursing implications of the technology.     

A Defective Child is Born A Study of Mothers of Newborns with Spina Bifida and Hydrocephalus

Eleven mothers of children born with spina bifida and/or hydrocephalus gave firsthand information about the problems they had during their first 7 postpartum days. Among the most heavily reported concerns were the fear that they had done something prenatally to cause the babies' defects and the pressure they felt to be brave and put up u good front. The study also revealed that while each of the mothers had fears und concerns typically attributed to mothers of defective newborns, only 3 of them were counseled regarding these feelings and only 6 were referred to community agencies for continuing assistance. Among other findings were that the majority of the respondents recommended placement in nonprivate rooms and that most of the women found comments like "You can always have another baby" to be useless and, in some cases, harmful. Recommendations made by the participants in the study may be valuable in planning the care of other mothers in similar circumstances.