Successful weight loss maintainers use health-tracking smartphone applications more than a nationally representative sample: comparison of the National Weight Control Registry to Pew Tracking for Health.

OBJECTIVE: The objective of this paper is to evaluate successful weight loss maintainers' use of self-monitoring technology. METHODS: National Weight Control Registry (NWCR) participants, who maintained a ≥13.6 kg weight loss for ≥1 year, completed an online survey about self-monitoring technology use. The NWCR sample (n = 794) was compared with a demographically similar subsample of 833 individuals answering the same questions in the Pew Tracking for Health Survey. RESULTS: The NWCR had higher rates of tracking weight, diet or exercise using any modality (92.8% vs. 71.3%), on a regular basis (67.4% vs. 41.3%), and frequency of updating records, compared with Pew (ps < .01). Smartphone ownership was higher in NWCR participants (80.2% vs. 52.8%, p < .001), and NWCR smartphone owners had 23.1 times greater odds for using diet, food or calorie counter apps (58.9% vs. 5.9%) and 15.5 times greater odds for using weight monitoring apps (31.7% vs. 3.0%; all ps < .01). Pew respondents more often changed their behaviour based on their tracking data (ps < .01). CONCLUSION: Use of self-monitoring technology is common in weight loss maintainers: more so than in a nationally representative sample. However, the national sample more often changed their behaviour based on tracking data, perhaps suggesting that weight loss maintainers could derive additional benefit from technology they are already using.

Mucormycosis in a transplanted kidney.

Mucormycosis of the transplanted kidney has so far been reported in only 9 patients, with a high mortality rate. Here, we report a rare case of isolated mucormycosis of the transplant kidney with successful outcome.

Incidence of class 1 and 2 integrases in clinical and commensal bacteria from livestock, companion animals, and exotics.

Many pathogenic and commensal organisms are multidrug resistant due to exposure to various antibiotics. Often, this antimicrobial resistance is encoded by integrons that occur on plasmids or that are integrated into the bacterial chromosome. Integrons are commonly associated with bacterial genera in the family Enterobacteriaceae. We determined that class 1 integrases were present in approximately 46% of the isolates from the family Enterobacteriaceae; class 2 integrases were present only among Escherichia coli and Salmonella isolates. Seven percent of veterinary isolates were positive for class 3 integrase by DNA-DNA hybridization but could not be confirmed to be positive by PCR. None of the veterinary isolates possessed the class 4 integrase gene. The distribution of these integrase genes was variable within the members of the family Enterobacteriaceae when some or all integrase classes were absent from a particular genus. There was also considerable variability in the distribution of these integrases within a species, depending on the animal host. Unlike the class 1 integrases, the other integrase class, intI2, appears to be more restricted in its distribution among the members of the family Enterobacteriaceae. There is also considerable variability in the distribution of the class 1 integrases within E. coli strains isolated from different food animals. The class 1 integrases are the most widely disseminated of the four classes among the members of the family Enterobacteriaceae from both the clinical and normal flora of animals. This is the first report to closely examine the distribution of class 2 integrases in members of the family Enterobacteriaceae isolated in the United States.

Fomepizole treatment of ethylene glycol poisoning in an infant.

The enzyme alcohol dehydrogenase metabolizes ingested ethylene glycol (EG) to the toxic compounds glycolic and oxalic acids. Renal failure, acidosis, hypocalcemia, and death may follow. Traditional treatment of EG poisoning may require ethanol, a competitive substrate of alcohol dehydrogenase, and hemodialysis, that removes both EG and its toxic metabolites. A new alcohol dehydrogenase inhibitor, fomepizole (4-methylpyrazole), was approved in 1997 for patients at least 12 years old with suspected or confirmed EG poisoning. Fomepizole has not been studied adequately in the pediatric population. We present a case of an 8-month-old male infant who drank up to 120 mL of EG and developed acidosis and oxalate crystalluria. He was treated with fomepizole and hemodialysis. Even after the completion of hemodialysis, fomepizole appeared to effectively block the production of EG toxic metabolites and to allow the resolution of acidosis; the patient recovered within 48 hours. This is the first report of fomepizole treatment of EG poisoning in an infant.4-methylpyrazole, fomepizole, poisoning, ethylene glycol, hemodialysis, infant, child, pediatrics.

Rural dentistry: opportunities for the next millennium in fixed and mobile practices.

Many dentists assume that practice in California's rural counties would be hindered by lower income potential, professional isolation, and lack of specialists for assistance. The evidence suggests otherwise, however. Income data show that the population of many rural counties can well afford dental care. In addition, new uses of the Internet for teleconsulting and idea exchange has the potential for reducing isolation and providing access to specialized knowledge. Particularly for those practitioners who enjoy the rural lifestyle, such counties offer excellent potential for dental practice.

The role of stressor intensity and underlying vasculopathy in altering coronary reactivity in cardiomyopathic hamsters.

OBJECTIVE: Our previous work showed that stress sensitized the vessels of cardiomyopathic hamsters (CMHs), but only hamsters in the lesion-forming period of their life. We hypothesized that we would find an interaction between stressor intensity and microvascular vulnerability. METHOD: Male CMHs at ages of 1.5, 2.5, and 3.5 months were stressed with supine immobilization for five consecutive days. Stressor intensity was manipulated by immobilizing groups of CMHs at room temperature for 0 minutes, 15 minutes, 30 minutes, 1 hour, or 2 hours. CMHs were anesthetized and sacrificed 5 days after stress, and their hearts were perfused using a modified Langendorff system. Body weight changes and baseline coronary vascular resistance (CVR) were recorded, and CVR was also measured after coronary artery infusion of arginine vasopressin (AVP). RESULTS: Stress produced no effect on coronary vasculature in 1.5-month-old CMHs. In 2.5-month-old CMHs, only the two highest-intensity stressors enhanced coronary reactivity to AVP. In 3.5-month-old CMHs, higher-intensity stressors produced a marginal AVP-induced increase in CVR; but this marginal increase was significantly lower than the increases seen with the two highest-stressor intensities in the 2.5-month-old CMHs. CONCLUSION: The stress-induced coronary hyperreactivity to AVP seen in 2.5-month-old CMHs diminished when microvascular vulnerability was lower in 3.5-month-old CMHs. For 1.5-month-old CMHs, the resting CVR was extremely high, so that the addition of stress produced no further increase. Thus, stressor intensity interacted with microvascular vulnerability to alter the consequences of stress.

Effects of vesnarinone, a novel orally active inotropic agent with an immunosuppressive action, on experimental cardiac transplantation in rats.

BACKGROUND: Vesnarinone (VES) has been used for treatment of patients with congestive heart failure. In addition to inotropic effects, it seems to have immunosuppressive action. We tested the hypothesis that VES suppresses graft rejection, inotropic dysfunction caused by early rejection, and chronic coronary obstruction in a heterotopic rat cardiac transplantation model. METHODS: (1) To study acute rejection, hearts from Lewis-Brown Norway (LBN) rats were transplanted into Lewis rats, which were treated with or without VES (50 or 100 mg/kg/day orally). (2) In a functional study, LBN hearts with or without VES (100 mg/kg/ day) were isolated and perfused on day 3 after transplantation to assess inotropic response to isoproterenol (3 x 10(-8) M). (3) To study chronic rejection, Lewis hearts were transplanted into Fisher 344 rats, which were treated with or without VES (50 mg/kg/day) for 90 days. Coronary obstructive disease was assessed by morphometric analysis. There were five to six animals in each group. RESULTS: (1) VES (100 mg/kg/day) prolonged LBN heart survival (11.7 +/- 0.7 vs. 9.6 +/- 0.7 days in control; P < 0.05). (2) Left ventricular developed pressure was depressed in transplanted hearts regardless of VES treatment (84 +/- 12, 90 +/- 8 vs. 144 +/- 16 mmHg in untransplanted hearts; P < 0.01). The developed pressure after administration of isoproterenol in VES-treated hearts (184 +/- 20 mmHg) was higher than transplanted hearts without VES (118 +/- 16 mmHg; P < 0.05), and similar to untransplanted hearts (203 +/- 27 mmHg; P = NS). (3) Transplanted hearts treated with or without VES showed similar grades of rejection (2.0 +/- 0.3 vs. 2.6 +/- 0.2; P = NS), intimal area (6,996 +/- 3,186 vs. 13,441 +/- 5,165 microns2; NS), and coronary luminal obstruction (45 +/- 16% vs. 67 +/- 14%; NS). CONCLUSIONS: VES produces mild prolongation in survival of rat heart grafts, but has no significant effect on chronic graft atherosclerosis. VES preserves the positive inotropic effects of isoproterenol that are otherwise deteriorated by early acute rejection.

Tolerance to cardiac allografts requires a time lag between intrathymic treatment and transplantation.

Permanent tolerance to an experimental heterotopic cardiac allograft can be achieved by pretreatment with antilymphocyte serum (ALS) and intrathymic inoculation of donor cells. Most successful experimental protocols have employed a time lag of 2 to 3 weeks between intrathymic pretreatment and transplantation, which makes this treatment strategy impractical for clinical heart transplantation. In these experiments we modified the standard protocol by giving ALS 24 hr prior to both intrathymic injection of donor cells and heterotopic transplantation. Seven Lewis rats had intraperitoneal injection of 1 ml of ALS and 24 hr later underwent intrathymic injection of 5 X 10(7) donor Lewis-Brown Norway (LBN) splenocytes and heterotopic cardiac transplantation using an LBN donor. Mean graft survival was 24.4 days, significantly longer than the 7.8-day graft survival observed in untreated Lewis recipients (n = 5) (P < 0.02). However, graft survival was not different from that observed in Lewis rats pretreated with ALS alone (n = 5) (25.8 days, P = NS). Permanent graft survival was produced in two rats receiving only A-LS and in one rat receiving both ALS and intrathymic inoculation. In these experiments it appears that prolongation of graft survival may have been due to the effect of A-LS alone. These results suggest that there is a critical time period between intrathymic inoculation and transplantation that is needed for permanent tolerance to be induced consistently. This may be due to the kinetics of the effects of ALS on alloreactive T-lymphocytes or to a time-dependent requirement for antigen processing in the thymus.

Light therapy in bulimia nervosa: a double-blind, placebo-controlled study.

The effects of light therapy on food intake and affective symptoms of bulimia nervosa (BN) were examined in a double-blind study. Eighteen women who met DSM-III-R criteria for BN were randomly assigned to receive either 2500 lux of bright light (experimental condition) or < 500 lux of dim light (placebo condition) daily in the early evening for a 1-week period. The Structured Interview Guide for the Hamilton Depression Rating Scale-Seasonal Affective Disorder Version (SIGH-SAD), the Beck Depression Inventory (BDI), and the Bulimic Symptoms Checklist were administered to subjects before light exposure, after 1 week of light exposure, and after 7 days of withdrawal of light exposure. Throughout the study, the Profile of Mood States and the Daily Binge Record were completed daily. Compared with subjects in the dim light condition, subjects in the bright light condition showed a significant improvement in depressed mood during light exposure, as measured by both the BDI and the SIGH-SAD. There was a return to pretreatment levels of depression after withdrawal of light exposure. No changes in depression were noted in the placebo group. No effect of light therapy was found on the frequency, size, or content of binge-eating episodes. The results are discussed in terms of the physiological processes associated with light therapy and seasonal affective disorder that may underlie the affective and food intake symptoms of BN.

Durability of donor-specific and organ-specific heart transplant tolerance induced by intrathymic pretreatment with allogeneic spleen cells.

Permanent acceptance of an experimental cardiac allograft can be achieved in the rat by pretreating the recipient with antilymphocyte serum and intrathymic donor lymphocytes. We investigated the durability and specificity of the tolerance produced by this pretreatment in a rat model of heterotopic heart transplantation with Lewis-Brown Norway donors and Lewis recipients. Pretreated Lewis rats received 1 ml antilymphocyte serum intraperitoneally and 5 x 10(7) Lewis-Brown Norway splenocytes intrathymically, followed 21 days later by Lewis-Brown Norway cardiac transplantation. The first Lewis-Brown Norway cardiac allograft survived long term (mean 140 days) in pretreated recipients who were given no subsequent immunosuppression. After 60 days with a beating Lewis-Brown Norway allograft, tolerant Lewis recipients underwent a second cardiac allograft with either a Lewis-Brown Norway heart or a third-party Wistar-Furth heart. The second Lewis-Brown Norway cardiac allograft was not rejected (mean survival 76 days), but that from the third-party Wistar-Furth donor was rejected in a normal fashion (mean survival 10.4 days). The presence of second grafts did not affect survival of first grafts. Tolerant Lewis recipients of two Lewis-Brown Norway heart grafts underwent subsequent transplantation with Lewis-Brown Norway skin. Skin allograft survival in this group (mean 8.4 days) was not different from that in Lewis recipients without pretreatment. Rejection of skin grafts had no effect on the heart grafts. These data suggest that tolerance to cardiac allografts produced by intrathymic pretreatment is durable and extends to a second heart graft from a genetically identical donor. Tolerant rats reject third-party hearts and primary donor skin grafts normally, and tolerance to previously placed heart grafts is not abrogated by this rejection. Non-major histocompatibility complex skin antigens not present on cardiac cells may account for the tissue specificity of the tolerance produced by intrathymic treatment in this model.

Of mice and Marfan: genetic linkage analyses of the fibrillin genes, Fbn1 and Fbn2, in the mouse genome.

The fibrillin genes, FBN1 and FBN2, encode large extracellular matrix glycoproteins involved in the structure and function of microfibrils. Mutations in FBN1 are found in patients with Marfan syndrome, a heritable connective tissue disease that primarily affects the cardiovascular, ocular, and skeletal systems. We extended the studies of these genes by determining their chromosomal position in the mouse genome. Restriction fragment length polymorphisms (RFLPs) between the progenitors of an interspecific backcross involving AEJ/Gn and Mus spretus mice were used to establish the segregation patterns of the murine homologs, Fbn1 and Fbn2, in the backcross progeny. The results position Fbn1 between the B2m and Illa genes on mouse Chromosome (Chr) 2 and establish its candidacy for the Tight skin (Tsk) mutation. The results position Fbn2 between the D18Mit35 and Pdgfrb loci in the central region of mouse Chr 18. Fbn2 maps near three mutations [bouncy (bc), plucked (pk), and shaker with syndactyly (sy)] and may be a candidate for the pk mutation.