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PubMed2006

Negative cognitive style as a predictor of negative life events in depression-prone individuals: a test of the stress generation hypothesis.

BACKGROUND: Stress generation effects in depressed individuals have been well-documented. However, less is known about what personal attributes of depression-prone individuals may contribute to the stress generation effect. This study investigated the role of negative cognitive style in predicting the occurrence of negative life events. METHODS: Undergraduates identified as either high (n=76) or low (n=81) in negative cognitive style were assessed for lifetime history of depression followed by periodic assessment over the course of six months for the occurrence of negative life events and depressive episodes. RESULTS: Individuals with negative cognitive styles generated more negative life events (dependent events and interpersonal events, but not more independent or achievement-related events) than individuals with more positive cognitive styles. These results appear to be unique to women. LIMITATIONS: Utilizing participants specifically chosen to be high or low in negative cognitive style may limit generalizability to other individuals. CONCLUSIONS: Results suggest that an underlying negative cognitive style may account for the stress generation effect often found in depressed individuals, particularly for women. Adequately addressing cognitive patterns in treatment or prevention programs may not only effectively reduce depression, but may also reduce the likelihood of experiencing negative life events that often serve as precipitants for depression.

Adaptation, Psychological↗
PubMed1998

Hodgkin's disease: correlation of clinical characteristics with probabilities for negative lymphangiogram vs. negative laparotomy findings in patients with Stage I supradiaphragmatic presentations vs. those in patients with Stage II.

PURPOSE: At a time both when late complications and second malignancies have become a growing concern and when staging laparotomy has been largely abandoned and comparative studies for staging Hodgkin's disease by state of the art computed tomography (CT) vs. lymphangiography have revealed minimal differences in results for these procedures, our purpose for undertaking this study was twofold. Our initial reason was to determine and compare probabilities for negative abdominal findings for patients with Stage I presentations with those for patients with Stage II as determined by lymphangiography and subsequently by laparotomy for those patients who had negative lymphangiograms. Our second reason, being an extension of the first, was to create a resource that can be used in conjunction with other information for arriving at appropriate treatment decisions including giving either more or particularly less than standard institutional therapy and especially with respect to the abdomen. METHODS AND MATERIALS: Data on 714 patients with prelymphangiogram Stage I-II upper torso presentations of Hodgkin's disease were entered prospectively in our database between 1968 and 1987. Twenty-eight with lymphocyte predominant disease, who had both negative lymphangiogram and negative laparotomy findings and 17 with questionable diagnoses of lymphocyte-depleted or unclassified disease were excluded from subsequent analyses of 669 patients with nodular sclerosis (NS) and mixed cellularity (MC) diagnoses. RESULTS: Stage I: in final logistic models, negative lymphangiogram findings were associated strongly with a combination of no constitutional symptoms and nodular sclerosis histology, whereas negative laparotomy findings correlated strongly with a combination of no constitutional symptoms and female sex. Predicted probabilities depended on the ratios of favorable to unfavorable characteristics. Stage II: in final logistic models, negative lymphangiogram findings were associated strongly with a combination of no constitutional symptoms, nodular sclerosis histology, age <40 years, and <4 involved sites, whereas negative laparotomy findings correlated strongly with a combination of <4 involved sites and mediastinal disease. Predicted probabilities again depended on the ratios of favorable to unfavorable characteristics. CONCLUSION: This study demonstrated that probabilities for negative abdominal findings for patients with supradiaphragmatic presentations of NS and MC Hodgkin's disease depended on: 1) whether the disease presented as Stage I or as Stage II; 2) whether staging was limited to a lymphangiogram or whether it included a laparotomy; and 3) or whether the clinical features associated with the presenting stage and methods of staging were favorable or unfavorable.

Abdomen↗
PubMed2000

Autografting with Ph-negative progenitors in patients at diagnosis of chronic myeloid leukemia induces a prolonged prevalence of Ph-negative hemopoiesis.

OBJECTIVE: In many patients with chronic myeloid leukemia (CML), a residual population of primitive normal (Ph-negative) progenitors persists despite the marked expansion of the leukemic (Ph-positive) clone. These cells may be found in the blood of patients studied soon after diagnosis or during the period of endogenous hematopoietic recovery that follows myeloreductive therapy. Based on those observations, we have developed a clinical protocol that allows collection of Ph-negative peripheral blood progenitor cells (PBPC) with transplantable hematopoietic regenerative potential. The aim of this study is to examine changes that occur in the percentage of Ph-negative- and Ph-positive-committed progenitor cells and to determine the relationship between changes and clinical outcome. MATERIALS AND METHODS: We followed 15 patients with CML, mobilized and autografted soon after diagnosis with 85%-100% Ph-negative PBPC for a median time of 28 months (range 18-50) after transplant. At 6 months, 1 year, 2 years, and last follow-up, cytogenetic analyses were performed on fresh bone marrow cells and on colony-forming cells (CFC). RESULTS: Autologous transplantation induces a reduction in the proportion of Ph-positive CFC, from 70%-100% to 0%-25% in the majority of patients (78%). After autografting, 8 of 15 patients achieved a long-lasting cytogenetic remission (median, 24 months; range, 21-43) with a Ph-positivity ranging between 0% and 20% at the level of mature mononuclear cells and colony-forming cells (CFC). In some patients, the majority of CFC remained Ph-negative, whereas the majority of the mature cells were Ph-positive. Other patients (5/15) developed cytogenetic relapse (100% Ph-positive), although they were in hematological remission. We found that detection of Ph-positive long-term-culture initiating cells (LTC-IC) in the marrow at diagnosis was the only factor significantly associated with recurrence of the disease (p < 0.01); on the other hand, the number of Ph-negative LTC-IC infused showed a significant correlation with a better outcome (p < 0.03). CONCLUSION: We have shown that a prolonged period of complete or almost complete Ph-negative hemopoiesis can be achieved in patients with CML who undergo autografting with Ph-negative progenitors. Longer follow-up study will be needed to assess whether these changes are associated with improved survival.

Adult↗
PubMed2003

Development of a Gram-negative selective agar (GNSA) for the detection of Gram-negative microflora in sputa in patients with cystic fibrosis.

AIMS: To develop a selective agar medium to help detect and quantify Gram-negative flora in the sputum of patients with cystic fibrosis (CF). METHODS AND RESULTS: A novel Gram-negative Selective Agar (GNSA) medium was developed consisting of tryptone soya broth (30 g), bacteriological agar no.1 (10 g), yeast extract (5 g), crystal violet (2 mg), nisin (48 mg), novobiocin (5 mg), cycloheximide (100 mg), amphotericin (2 mg) and double distilled water (1 l), for the selective culture of all Gram-negative flora from the sputum of patients with CF. GNSA was able to support the proliferation of all 34 Gram-negative organisms examined, including 23 species most commonly associated with CF, but was unable to support the growth of the 12 Gram-positive or seven fungal organisms examined. Sensitivity studies demonstrated that the GNSA medium was able to detect not less than 1.50 x 102 CFU ml-1 sputum Pseudomonas aeruginosa, 2.38 x 102 CFU ml-1 sputum Burkholderia cepacia genomovar IIIb and 6.70 x 103 CFU ml-1 sputum Stenotrophomonas maltophilia. A comparison of the microbial flora detected in the sputa of 12 adult CF patients by employment of routine bacteriological agar media and GNSA, demonstrated that GNSA was able to detect all Gram-negative organisms cultured by routine media, but had the advantage of detecting Alcaligenes xylosoxidans in two CF patients, whom had no previous history of Gram-negative infection. CONCLUSIONS: GNSA was unable to support the proliferation of any Gram-positive organism or yeast/fungi, but was successful in supporting the growth of all Gram-negative organisms challenged. SIGNIFICANCE AND IMPACT OF THE STUDY: Employment of this medium coupled with semi-automated technology may aid in helping to efficiently determine Gram-negative loading of respiratory secretions, particularly in response to antibiotic intervention.

Adult↗
PubMed2003

Effects of different negative pressures on reduction of wounds in negative pressure dressings.

Negative pressure dressings stimulate the healing of tissue-deficient wounds by applying continuous or intermittent negative pressure. This study was designed to determine the most effective negative pressure level for the reduction of the wound by using negative pressure dressings in animal studies. Fifty male Wister rats weighting 200-250 grams were used throughout the study. The animals were divided into five groups of ten animals each as follows: group 1: no negative pressure and a closed dressing method using a polyurethane foam and an adhesive drape. Group 2-5: 25, 50, 75 and 125 mmHg negative pressure and a closed dressing method using a polyurethane foam and an adhesive drape. The wounds were measured along the vertical and horizontal lengths of the body axis and the wound area was calculated. The reduction of the wound area was weaker in the group with a negative pressure of 25 mmHg, and similarly higher among the groups with negative pressures of 50, 75, or 125 mmHg. There were no significant differences in the reduction of the wound area among the latter three groups.

Animals↗
PubMed2006

Pulmonary embolism: accuracy and safety of a negative CT pulmonary angiogram and value of a negative D-dimer assay to exclude CT pulmonary angiogram-detectable pulmonary embolism.

This is a retrospective study to determine the accuracy and safety of a negative CT pulmonary angiogram (CTPA) based on clinical outcome and to determine the usefulness of a negative D-dimer assay before CTPA. A total of 483 patients with a negative CTPA study were followed up for 3 months, with the aim of detecting episodes of venous thromboembolism and mortality. Three hundred and forty-nine patients had an immunochromatographic D-dimer assay called 'Simplify', carried out before a CTPA examination. Seventy-eight patients had a negative D-dimer assay and a negative CTPA. Three patients had a negative D-dimer assay and a positive CTPA. All three patients had a moderate pretest clinical probability. Of the 483 patients who had a negative CTPA and a 3-month follow up, 444 (92%) were alive and 39 (8%) had died. Of the 444 patients who were alive, none had any further suspected episode of thromboembolism or had received anticoagulation therapy within the follow-up period. Of those who died, none of the deaths was thought to be as a result of pulmonary embolism (PE). Single-detector helical CT can be used safely as the primary diagnostic test to evaluate PE. Negative Simplify D-dimer assay and low pretest clinical probability exclude CTPA-detectable PE, and a CTPA is unnecessary in this cohort of patients.

Adult↗
PubMed2005

Examining the association between rumination, negative affectivity, and negative affect induced by a paced auditory serial addition task.

The present study examined the relations among a depressive ruminative response style, a general propensity to experience negative affectivity, and negative affect induced by a paced serial auditory addition task (PASAT). Ninety nonclinical individuals completed a computerized version of the PASAT, which elicits a generalized negative affect response [Lejuez, C. W., Kahler, C. W., & Brown, R. A. (2003). A modified computer version of the paced auditory serial addition task (PASAT) as a laboratory-based stressor: Implications for behavioral assessment. Behavior Therapist, 26, 290-292]. As hypothesized, there was a moderate correlation between depressive rumination and a propensity to experience negative affect, as indexed both by a significant association with a negative affect personality factor and the prediction of negative affect elicited during the provocation. Findings also suggested that dispositional negative affectivity moderated the effects of a depressive ruminative response style on the valence but not arousal dimensions of emotional responding to the challenge. These findings are discussed in terms of improving our understanding of rumination and its potential role in emotional vulnerability processes.

Adolescent↗
PubMed2000

Rapid detection of mecA-positive and mecA-negative coagulase-negative staphylococci by an anti-penicillin binding protein 2a slide latex agglutination test.

A rapid slide latex agglutination (LA) test, MRSA-Screen (Denka Seiken Co., Niigata, Japan), which detects PBP 2a, was tested for its ability to differentiate between mecA-positive and -negative coagulase-negative staphylococci. A total of 463 isolates from 13 species were included in the study. The mecA gene was detected by PCR, and the oxacillin MIC was determined by the agar dilution method according to the guidelines of the National Committee for Clinical Laboratory Standards (NCCLS). The LA test was performed with oxacillin-induced isolates. The true-positive and true-negative results were defined on the basis of the presence or the absence of the mecA gene. By PCR, 251 isolates were mecA positive and 212 were mecA negative. The sensitivities, specificities, and positive and negative predictive values for the LA test compared to the NCCLS breakpoint for oxacillin resistance (>/=0.5 mg/liter) were as follows: for the LA test, 100, 99.5, 99.6, and 100%, respectively; for the NCCLS breakpoint, 100, 60.8, 75.1, and 100%, respectively. One hundred twenty-five mecA-positive isolates were also tested by the LA test without induction of PBP 2a; only 72 (57.6%) gave a positive result and required 3 to 15 min for reaction. With induction, all 251 isolates were positive within 3 min. The LA test was reliable in classifying mecA-negative isolates, but it classified isolates for which the oxacillin MIC was >/=0.5 mg/liter as oxacillin susceptible. For the reliable detection of oxacillin resistance by the MRSA-Screen in coagulase-negative staphylococci, induction of the mecA gene appears to be necessary.

Bacterial Proteins↗
PubMed2002

Characteristics and outcome of patients with Philadelphia chromosome negative, bcr/abl negative chronic myelogenous leukemia.

BACKGROUND: Up to 5% of patients with chronic myelogenous leukemia (CML) do not have the Philadelphia (Ph) translocation t(9;22)(q34;q11) or a bcr/abl molecular rearrangement. Although the diagnostic criteria of this entity are still under debate, there is general agreement that patients with Ph negative, bcr/abl negative CML have a severe clinical course that is not affected significantly by current treatment options. METHODS: A population of 76 patients with bcr/abl negative CML who had received minimal or no previous therapy was characterized carefully with the intent of investigating clinical and hematologic variables and their association with survival by univariate, correlation, and multivariate analyses. A group of 73 patients with Ph negative CML who were not tested for the bcr/abl rearrangement (bcr/abl unknown) was analyzed separately and used for extension of the analysis. RESULTS: In the bcr/abl negative patient population, the median overall survival was 24 months. At the time of the analysis, 38 patients (50%) had died, and blastic transformation preceded death in 31%. Chromosomal abnormalities were found in 30% of the 76 patients, with trisomy 8 the most common abnormality. Complex chromosomal abnormalities were rare, and monosomy 7 was not observed. Survival was not affected significantly by treatment. Multivariate analysis identified older age (> 65 years), anemia (hemoglobin < 10 g/dL), and severe leukocytosis (white blood cells > 50 x 10(9)/L) as variables with independent prognostic significance for poor survival. A prognostic scoring system stratified patients into a low-risk group (53%) and a high-risk group (47%), with median survivals of 38 months and 9 months, respectively. CONCLUSIONS: Bcr/abl negative CML is a distinct clinical entity associated with very poor prognosis. Two risk categories are identifiable using a simple scoring system based on age, hemoglobin level, and leukocyte number.

Adult↗
PubMed1994

Co-expression of c-abl and c-myb oncogenes in Philadelphia chromosome-negative, bcr-negative chronic myeloid leukaemia.

Three cases of Philadelphia (Ph) chromosome-negative, bcr-negative chronic myeloid leukaemia (CML) have been investigated for oncogene expression by Northern blot and cytoplasmic RNA dot blot hybridization. Considerably high levels of expression of c-abl and c-myb were observed in all cases. In the Ph-negative cells the normal 6.0 and 7.0 kb c-abl and 3.8 kb c-myb transcripts were found. No amplification of c-abl or c-myb oncogenes was detected in the DNAs of Ph-negative CML cells. Data suggest that co-operation between the overexpressed c-abl and c-myb oncogenes is causally related to Ph-negative bcr-negative CML.

Adolescent↗
PubMed1993

Cellular differences between true negative and false negative Papanicolaou smears.

A matched case-control study of 123 false negative Papanicolaou smears and 488 true negative Papanicolaou smears was undertaken to determine the association between the types of cells present on the smear and the correctness of the cytology report. The false negative slides were significantly more likely to include endocervical columnar cells than the true negative slides (odds ratio 1.90, 95% confidence interval (CI) 1.21-3.01). No statistically significant difference in metaplastic cell status was evident (odds ratio 1.48, 95% CI 0.95-2.30). When considered together, metaplastic and/or columnar cells were significantly more likely to be present in false negative smears than in true negative smears (odds ratio 1.87, 95% CI 1.13-3.08). The implications of these findings for improving the accuracy of cervical cytology for the detection of precancerous lesions are discussed.

Case-Control Studies↗
PubMed2004

Previous or occult hepatitis B virus infection in hepatitis B surface antigen-negative and anti-hepatitis C-negative patients with hepatocellular carcinoma.

PURPOSE: We investigated the clinical and virologic findings in hepatitis B surface antigen (HBsAg)-negative and anti-hepatitis C virus antibody (anti-HCV)-negative patients with hepatocellular carcinoma (HCC) to investigate the role of previous or occult hepatitis B virus (HBV) infections in the development of HCC. METHODS: We examined sera and HCC samples from 40 HBsAg-negative and anti-HCV-negative patients. Sera were tested for some viral markers, and genomic DNA was extracted from the HCC samples. HBx RNA was also extracted from the HCC and amplified by a polymerase chain reaction with reverse transcription (RT-PCR). RESULTS: Hepatocellular carcinomas from five patients with anti-HBc (group 1, 25 patients) and nine patients without anti-HBc (group 2, 15 patients) were examined for HBx RNA. HBx RNA was detected in four of the five HCC samples from group 1 and in four of the nine HCC samples from group 2. CONCLUSION: These findings suggested that previous or occult hepatitis B virus infection is common in HBsAg-negative and anti-HCV-negative patients with HCC.

Adult↗
PubMed2004

Cardiac events in patients with negative maximal versus negative submaximal dobutamine echocardiograms undergoing noncardiac surgery: importance of resting wall motion abnormalities.

OBJECTIVES: This study sought to evaluate the negative predictive value (NPV) of preoperative dobutamine stress echocardiography (DSE) in patients who fail to achieve target heart rate (HR) and assess the influence of resting wall motion abnormalities (WMAs) without demonstrable ischemia on perioperative events. BACKGROUND: The prognostic value of a negative-submaximal DSE study before noncardiac surgery is unknown. METHODS: Consecutive patients (n = 429) who underwent surgery over a three-year period, preceded by DSE, were included. We compared perioperative event rates among those without inducible ischemia according to whether or not 85% age-adjusted maximum HR was achieved, and whether WMAs were present at rest. RESULTS: Of 397 negative DSEs, peak HR was <85% maximum predicted in 62 (16%). Most were receiving beta-blockers (77%). The average dobutamine and atropine doses were 48 microg/kg/min and 1.2 mg, respectively. Average HR was 115 beats/min (74% maximum predicted). Perioperative myocardial infarctions occurred more frequently in patients with positive tests (3 of 32 [9.4%] vs. 7 of 397 [1.8%]; p = 0.03), but with similar frequency among the negative-maximal and negative-submaximal groups (6 of 335, 1.8% vs. 1 of 62, 1.6%, respectively). Accordingly, the NPV was 98% in both subgroups. Events occurred exclusively in patients with WMAs at rest: 7 of 100 (7%) versus 0 of 297 (0%) (p < 0.0001). CONCLUSIONS: In patients undergoing preoperative DSE, failure to achieve target HR is not uncommon despite an aggressive DSE regimen. A negative DSE without resting WMAs has excellent NPV regardless of the HR achieved. Patients with resting WMAs appear to be at increased risk for perioperative events even without provokable ischemia.

Adrenergic beta-Agonists↗
PubMed1997

The reliability and validity of empirically scaled measures of psychological/verbal control and physical/sexual abuse: relationship between current negative mood and a history of abuse independent of other negative life events.

A history of psychological, physical, and sexual abuse, and circumscribed negative life events are precursors of current psychosomatic symptomatology. However, it is not known whether a history of abuse predicts current symptomatology, independent of other negative life events. We developed three new abuse scales: Psychological/Verbal; Control; and Physical/Sexual, which emerged when survey evidence of a random sample of the general public (N = 195) was factor analyzed. Test-retest reliabilities conducted on university students (N = 62) were moderate to high: Psychological/Verbal (r = 0.86); Control (r = 0.76); Physical/Sexual (r = 0.74); and Negative Life Events (r = 0.84). A Negative Life Event scale was developed to measure the cumulative effects of events (over the lifespan). A total score was calculated by summing event scores, weighted in proportion to 11 independent judges' ratings of distress for later use (Kendall's W; chi 2 = 183.67, df = 67, p < 0.0001). Thirteen criterion measures of current symptomatology were administered to a subsample of the original sample (N = 92), and collapsed into one factor for use as the criterion in a regression analysis; results showed that, independent of negative life events and respondent demographics, the Psychological/Verbal and Control Abuse Scales predicted current negative mood and psychosomatic complaints, and the association between current symptomatology and the Physical/Sexual Abuse Scale approached, but did not achieve, statistical significance (t = 1.99, df = 71, p < .0501). The present study demonstrates that the three abuse scales may be powerful predictors of current symptomatology, and that they have the potential for further investigating a wider range of current medical, physiological, and psychological problems.

Adult↗
PubMed1998

Negative information weighs more heavily on the brain: the negativity bias in evaluative categorizations.

Negative information tends to influence evaluations more strongly than comparably extreme positive information. To test whether this negativity bias operates at the evaluative categorization stage, the authors recorded event-related brain potentials (ERPs), which are more sensitive to the evaluative categorization than the response output stage, as participants viewed positive, negative, and neutral pictures. Results revealed larger amplitude late positive brain potentials during the evaluative categorization of (a) positive and negative stimuli as compared with neutral stimuli and (b) negative as compared with positive stimuli, even though both were equally probable, evaluatively extreme, and arousing. These results provide support for the hypothesis that the negativity bias in affective processing occurs as early as the initial categorization into valence classes.

Adult↗
PubMed2004

Error-related negativity reflects detection of negative reward prediction error.

Error-related negativity (ERN) is a negative deflection in the event-related potential elicited in error trials. To examine the function of ERN, we performed an experiment in which two within-participants factors were manipulated: outcome uncertainty and content of feedback. The ERN was largest when participants expected correct feedback but received error feedback. There were significant positive correlations between the ERN amplitude and the rate of response switching in the subsequent trial, and between the ERN amplitude and the trait version score on negative affect scale. These results suggest that ERN reflects detection of a negative reward prediction error and promotes subsequent response switching, and that individuals with high negative affect are hypersensitive to a negative reward prediction error.

Adult↗
PubMedDate not supplied

Oral sex as a risk factor for Chlamydia-negative ureaplasma-negative nongonococcal urethritis.

We present a case-control study that evaluated the association of Chlamydia-negative, Ureaplasma-negative nongonococcal urethritis with oral and/or anal sex. The study population was composed of 120 patients diagnosed as having nongonococcal urethritis in the Diagnostic Center for sexually transmitted diseases (STD) of the Medical School of Seville. Cases were 56 men suffering from nonogonococcal urethritis from whom neither Chlamydia trachomatis nor Ureaplasma urealyticum was isolated; the remaining 64 males with cultures positive for these agents were considered as controls. Insertive genital-oral intercourse significantly increased the risk of Chlamydia-negative, Ureaplasma-negative nongonococcal urethritis (odds ratio, 11.400; 95% confidence interval, 2.357-75.057). This association was still very strong (odds ratio, 8.882) after adjustment for homosexuality. Insertive anal intercourse appears not to increase the risk of Chlamydia-negative, Ureaplasma-negative nongonococcal urethritis. We conclude that insertive oral sex can be an important risk factor in the development of nongonnococcal urethritis in which the microbial agent is still unknown.

Chlamydia trachomatis↗