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PubMed1994

Increase in haematocrit in borderline hypertensive men.

1. Haematologic parameters were measured in untreated borderline hypertensive (BHT) men, and weight and age matched with normotensive men to determine whether previously described increased haematocrit (Hct) in established hypertension is evident in borderline hypertension. 2. Haematocrit was significantly increased in BHT men (mean 0.46, s.d. 0.032) compared with normotensive men (mean 0.43, s.d. 0.014) and correlated significantly with mean arterial pressure in this group (r = 0.67, P = 0.036) independent of weight. 3. The correlation of blood pressure with Hct in BHT men supports the concept that increased Hct may contribute to increased blood viscosity and thus to raised arterial pressure.

Adult↗

PubMed1984

Pathological aspects of the UK Breast Screening Project with special reference to minimal and 'borderline' lesions.

Because of the logistical and financial implications of large scale screening for the early detection of breast cancer, the Department of Health and Social Security in the UK has established a study to compare two methods, mammography and breast self-examination. Screening is under evaluation in women aged 45-64 years, over a seven year period. Mammography is carried out in health districts based on Edinburgh and Guildford and self-examination related to a programme of education in Huddersfield and Nottingham. Four other health districts, Bristol, Dundee, Oxford and Stoke, act as control areas. A Pathology Review Panel composed of pathologists from each participating centre has been established to verify the accuracy of the histopathological data. In particular, all lesions in the borderline between benign and malignant disease are reviewed together with all minimal carcinomas. The Pathology Panel has carried out four consistency surveys to improve diagnostic criteria and accuracy, and 83% agreement is now achieved with no errors across the benign/malignant border. Review of 'borderline' cases from the study is now in progress.

Breast↗

PubMed1996

Comparative cytogenetic studies of benign, borderline, and malignant epithelial ovarian tumors.

Comparative cytogenetic studies were performed in 40 cases of untreated epithelial ovarian tumors. Of these 40 tumors, 13 were classified as benign, 3 as borderline, and 24 as malignant, according to the WHO classification for ovarian tumors. Of 13 benign ovarian tumors, 4 (30.8%) showed chromosomal abnormalities. Of 4 ovarian tumors, 3 (75%) had single chromosomal abnormalities, and the remaining tumor (25%) retained multiple chromosomal abnormalities. Of 3 borderline-malignant ovarian tumors, 2 (66.7%) showed chromosomal abnormalities. Of 2 ovarian tumors, 1 (50%) indicated single chromosomal abnormalities, and the remaining tumor (50%) revealed multiple chromosomal abnormalities. Of 24 malignant ovarian tumors, 20 (83.3%) showed chromosomal abnormalities. Of these 20 ovarian tumors, 3 (15%) had single chromosomal abnormalities, and the other 17 (85%) exhibited multiple chromosomal abnormalities. These data indicate that the rate of chromosomal abnormalities, especially multiple abnormalities, increases following the progression of malignancy in epithelial ovarian tumors.

Adenoma↗

PubMed1998

Ovarian endometrioid adenocarcinoma coexistent with benign and borderline endometrioid adenofibroma: a case report.

A well-differentiated endometrioid adenocarcinoma coexistent with benign and borderline-malignant endometrioid adenofibroma was found in the ovary of a 64-year-old woman. She had vaginal bleeding caused by simple hyperplasia of the endometrium due to high levels of sex steroid hormones. A FIGO stage Ia solid ovarian tumor was identified. It was composed of irregularly shaped endometriotic glands with benign and borderline malignant cytologic features embedded in abundant fibromatous stroma. Well-differentiated malignant epithelium was adjacent to these areas, but fibromatous stroma was not predominant. She was treated by surgery and three cycles of chemotherapy. This paper describes this unusual tumor and reviews the literature.

Adenofibroma↗

PubMed1995

Social and biological risk factors for mild and borderline impairment of language comprehension in a cohort of five-year-old children.

Biological risk factors during intra-uterine life, delivery and the neonatal period, and measures of social adversity during pregnancy, were studied as predictors of a 'mildly impaired' (50 to 74) or 'borderline' (75 to 84) score on the Peabody Picture Vocabulary Test (PPVT) at aged five years in 3906 children. Biological risk factors in pregnancy were associated with neither PPVT outcome. Gestation of < 36 weeks, > 3 minutes to establishment of respiration and admission to intensive care were associated with a lower PPVT score indicating mild impairment, though only in the unadjusted analyses. A five minute Apgar score of < 5 and male sex were related to borderline scores, though only the latter remained significant after statistical allowance for possible confounding. In contrast, almost all measures of social adversity were related to both PPVT outcomes even after statistical adjustment for the influence of other factors.

Apgar Score↗

PubMed1987

Management of squamous atypia (borderline nuclear abnormalities): repeat cytology or colposcopy?

A prospective cytological, colposcopic and histological study was conducted in 44 women with cervical cytology showing borderline nuclear abnormalities insufficient for the diagnosis of dyskaryosis. Atypical squamous epithelium was found on colposcopy in 41 patients and cervical intraepithelial neoplasia (CIN) was diagnosed on histology in 33 patients (75%) including 10 with CIN 3. Repeat cytology obtained under colposcopic vision was negative in 12 (33.4%) patients with CIN. The high prevalence of CIN in smears showing only borderline nuclear abnormalities and the high false negative rate of repeat cytology indicate that colposcopy should be the first line of management for these patients.

Adult↗

PubMed1989

A comparative study of proliferating (borderline) and invasive epithelial ovarian tumours in young women.

A series of 18 patients with proliferating or borderline ovarian tumours and 18 with invasive ovarian tumours is discussed. Proliferating tumours occurred at a younger mean age than invasive disease, and presented at an earlier stage, both contributing factors to their more favourable outlook. Histopathological assessment revealed that the majority of both proliferating and invasive tumours were of serous origin. Mucinous cell type occurred less often as did the endometrioid and clear cell types. The management of the proliferating tumours involved 'radical' surgical procedures in 11 of 18 (61.6%) patients. Only 7 patients (38.8%) had conservative surgical procedures performed. Six patients (33%) had adjuvant chemotherapy while 2 (11%) also underwent abdominopelvic irradiation. All patients with invasive disease had radical surgery and adjuvant chemotherapy and 2 also received abdominopelvic irradiation. The fact that epithelial malignancies of the ovary do occur in younger women needs to be remembered by gynaecologists contemplating surgical procedures on younger patients with adnexal masses. Proliferating or borderline tumours tend to occur more frequently in the younger age groups, and contrary to the implication of their name, they are associated with significant morbidity and mortality.

Adolescent↗

PubMed1991

Borderline epithelial ovarian tumours.

Twenty-four patients with borderline epithelial ovarian tumours treated in the Department of Obstetrics and Gynaecology of Hacettepe University during the last 12 years were evaluated with regard to histopathology, therapeutic modalities employed and outcome. No mortality was encountered among the 23 patients with Stage 1 disease, regardless of the surgical mode of treatment or adjuvant therapy. The related literature was reviewed briefly to help enlighten the controversial issue of borderline ovarian tumours.

Adult↗

PubMed1980

The borderline patient and military life.

The view that the borderline patient can cope surprisingly well in a highly structured environment despite long-standing severe personality disturbance is studied. Military life provides such a structured environment and its role in the lives of these patients is presented through two case reports. The concept that the Army becomes 'military parents', accepts massive projections and survives splitting whilst providing a 'universal ego and super-ego' is developed and felt to be fundamental to the stability that borderline patients can achieve within the Services.

Adult↗

PubMed1990

Further characterization of borderline methicillin-resistant Staphylococcus aureus and analysis of penicillin-binding proteins.

Eighty-nine Staphylococcus aureus strains were grouped according to their susceptibility or resistance to methicillin and oxacillin. The role of beta-lactamase in borderline methicillin resistance was confirmed by tests with beta-lactamase inhibitors, particularly when salt-supplemented medium was used. A penicillin-binding protein assay indicated that borderline methicillin-resistant S. aureus strains do not produce PBP 2a.

Bacterial Proteins↗

PubMed1993

Efficacy of prophylaxis with beta-lactams and beta-lactam-beta-lactamase inhibitor combinations against wound infection by methicillin-resistant and borderline-susceptible Staphylococcus aureus in a guinea pig model.

Although some beta-lactams and beta-lactam-beta-lactamase inhibitor combinations exhibit activity against methicillin-resistant Staphylococcus aureus, there remains the concern that therapeutic failures may result from the selection of resistant subpopulations. The prophylactic use of these antibiotics in clean surgery, however, may prove adequate since wound infections arise from the inoculation of small numbers of bacteria. In this clinical setting, heterogeneity in the phenotypic expression of beta-lactam resistance may facilitate antibiotic efficacy. Similarly, beta-lactamase-mediated resistance in S. aureus is dependent on inoculum size, and it may be possible to prevent infection from small inocula with relatively labile beta-lactams. To test this hypothesis, antibiotics were administered to guinea pigs as prophylaxis against infection by two methicillin-resistant strains and one borderline-susceptible strain. Following prophylaxis with sulbactam or placebo, inoculation of only a dozen or fewer bacteria had a 50% probability of creating an abscess (50% infective dose [ID50]). The efficacy of ampicillin was similar to that of cefazolin, exhibiting moderate activity against the borderline-susceptible strain (ID50s, greater than 300 bacteria) and minimal activity against the methicillin-resistant strains (ID50s, fewer than 100 bacteria). Coadministration of sulbactam with ampicillin or cefazolin yielded better results than the beta-lactam alone for five of six strain-beta-lactam combinations, including an 80-fold increase in the efficacy of ampicillin-sulbactam compared with that of ampicillin for one methicillin-resistant strain (ID50s, 2,017 and 25 bacteria, respectively). Prophylaxis with beta-lactams, especially beta-lactam-beta-lactamase inhibitor combinations, reduces the risk of wound infection by beta-lactam-resistant S. aureus.

Ampicillin↗

PubMed1994

Mupirocin resistance among consecutive isolates of oxacillin-resistant and borderline oxacillin-resistant Staphylococcus aureus at a university hospital.

Mupirocin resistance was determined in consecutive oxacillin-resistant and borderline oxacillin-resistant Staphylococcus aureus clinical isolates collected over 14 months at a university hospital during 1991 and 1992. Twenty of 86 (23%) oxacillin-resistant and borderline oxacillin-resistant S. aureus isolates were mupirocin resistant; 80% were high-level resistant. Prior mupirocin use was a significant risk factor (relative risk, 6.08; 95% confidence interval, 3.7 to 9.99). Seven of 20 resistant isolates were distinct strains, as determined by pulsed-field gel electrophoresis typing. Two instances of clonal dissemination of a single strain occurred, but several other distinct mupirocin-resistant strains were documented. Mupirocin resistance was unexpectedly common among these isolates.

DNA, Bacterial↗

PubMed1998

Association of borderline oxacillin-susceptible strains of Staphylococcus aureus with surgical wound infections.

Staphylococcus aureus isolates which produce type A staphylococcal beta-lactamase have been associated with wound infections complicating the use of cefazolin prophylaxis in surgery. To further evaluate this finding, 215 wound isolates from 14 cities in the United States were characterized by antimicrobial susceptibility and beta-lactamase type and correlated with the preoperative prophylactic regimen. Borderline-susceptible S. aureus isolates of phage group 5 (BSSA-5), which produce large amounts of type A beta-lactamase and exhibit borderline susceptibility to oxacillin, comprised a greater percentage of the 120 wound isolates associated with cefazolin prophylaxis than they did of the 95 isolates associated with other prophylactic regimens (25% versus 12.6%, respectively; P < 0.05). In contrast, methicillin-resistant S. aureus isolates were distributed evenly between the two groups (8.3% versus 11.6%, respectively). In vitro assays demonstrated that cefazolin was hydrolyzed faster by BSSA-5 strains than by other beta-lactamase-producing, methicillin-susceptible strains (1.54 versus 0.50 microg/min/10(8) CFU, respectively; P < 0.0001). These data demonstrate that BSSA-5 strains are a distinct subpopulation of methicillin-susceptible S. aureus which frequently cause deep surgical wound infections. Cefazolin use in prophylaxis is a risk factor for BSSA-5 infection.

Cefazolin↗

PubMed1999

Disk with high oxacillin content discriminates between methicillin-resistant and borderline methicillin-susceptible Staphylococcus aureus strains in disk diffusion assays using a low salt concentration.

A separation between mecA+ strains of Staphylococcus aureus and strains lacking mecA was achieved by the disk diffusion assay and the agar dilution method, utilizing disks containing 5 microg of oxacillin and inocula of approximately 5 x 10(5) CFU/spot, respectively, provided that agar with 0 to 0.5% NaCl and incubation at 30 degrees C were employed. The 5-microg oxacillin disks clearly discriminated between borderline methicillin-susceptible and mecA+ strains. The oxacillin MICs were more affected by the inoculum density and salt concentration than were the methicillin MICs, and oxacillin MICs of 4 to 16 microg/ml were obtained for strains lacking mecA. Significantly higher levels of beta-lactamase production and reduced oxacillin susceptibilities were recorded for strains lacking mecA, in particular strains of phage group V, when agar with >/=2% NaCl was used than when agar with 0 to 0.5% NaCl was employed. The results indicate that the borderline methicillin-susceptible phenotype is a salt-dependent in vitro phenomenon of questionable clinical relevance.

Culture Media↗

PubMed2026

Genomic insights into low-level rifampicin resistance mediated by borderline rpoB mutations in Mycobacterium tuberculosis: prevalence and phylogeny in Northeast China.

The emergence of low-level rifampicin (RIF) resistance in Mycobacterium tuberculosis poses a challenge to tuberculosis (TB) control, as it often leads to discordance between genotypic resistance detected by molecular assays (e.g., Xpert MTB/RIF) and phenotypic susceptibility in conventional drug susceptibility testing (DST). In this study, we performed whole-genome sequencing (WGS) on 17 clinical isolates from Changchun, Northeast China, which exhibited such discordance. All isolates harbored functional borderline mutations in the rpoB RRDR region, predominantly Leu452Pro and Leu430Pro (29% each), followed by His445Asn (18%). RIF minimum inhibitory concentration (MIC) values ranged from ≤0.25 to 1.0 mg/L, confirming low-level resistance. Notably, 53% (9/17) of the isolates were co-resistant to fluoroquinolones and 24% (4/17) to isoniazid (INH). According to WHO classification, 59% (10/17) were pre-extensively drug-resistant TB (Pre-XDR-TB) or multidrug-resistant TB (MDR-TB). Phylogenetic analysis revealed that 94% (16/17) belonged to the East Asian Beijing lineage (Lineage 2.2.1), with no evidence of recent local transmission. These findings underscore the complexity of low-level RIF resistance and its frequent association with broader drug resistance in a dominant lineage, highlighting the need for integrating MIC and WGS into diagnostic algorithms to guide appropriate treatment and surveillance.IMPORTANCEThe accurate detection of RIF resistance is critical for the management of TB, yet standard phenotypic methods often fail to identify strains with low-level resistance conferred by borderline rpoB mutations. This study provides the first genomic characterization of such discordant isolates in Northeast China, revealing a high prevalence of co-resistance to other key drugs and a strong association with the locally dominant Beijing lineage. The findings emphasize that reliance on phenotypic DST alone may lead to underestimation of drug resistance and inappropriate treatment, potentially contributing to the emergence and spread of Pre-XDR-TB and MDR-TB. Incorporating MIC determination and WGS into routine diagnostics could enhance detection, inform tailored therapy, and improve surveillance of these clinically significant strains.

Mycobacterium tuberculosis↗

PubMed2005

Neonatal bilirubin production-conjugation imbalance: effect of glucose-6-phosphate dehydrogenase deficiency and borderline prematurity.

OBJECTIVE: To evaluate relations between production and conjugation of bilirubin in the pathophysiology of jaundice in glucose-6-phosophate dehydrogenase (G6PD) deficient neonates. METHODS: Term and borderline premature (35-37 weeks gestational age), healthy, male, G6PD deficient neonates were studied close to the beginning of the 3rd day. Blood carboxyhaemogobin corrected for inspired CO (COHbc; an index of bilirubin production) and serum total conjugated bilirubin (TCB; a reflection of bilirubin conjugation) were measured in simultaneously drawn blood samples by gas chromatography and reverse phase high performance liquid chromatography respectively. A bilirubin production-conjugation index comprising COHbc/TCB was determined; a high index reflects imbalance between the bilirubin production and conjugation processes. COHbc and TCB individually and the production-conjugation index were studied in relation to serum total bilirubin (STB) concentration. RESULTS: Fifty one G6PD deficient neonates were sampled at 51 (8) hours. COHbc values did not correlate with STB (r=0.22, p=0.15). TCB did correlate inversely with STB (r=-0.42, p=0.004), and there was a positive correlation between the production-conjugation index and STB (r=0.45, p=0.002). The production-conjugation index (median (interquartile range)) was higher in the premature (n=8) than term neonates (2.31 (2.12-3.08) v 1.05 (0.53-1.81), p=0.003). This difference was the result of changes in TCB. CONCLUSIONS: The data show that jaundice in G6PD deficient neonates is the result of an imbalance between production and conjugation of bilirubin with a tendency for inefficient bilirubin conjugation over increased haemolysis in its pathogenesis. Borderline premature infants are at special risk of bilirubin production-conjugation imbalance.

Bilirubin↗

PubMed1993

Benign rheumatoid nodules in a woman with chronic lymphocytic leukaemia and borderline lepromatous leprosy.

OBJECTIVES: To report benign rheumatoid nodules in a woman with chronic lymphocytic leukaemia and borderline lepromatous leprosy and to summarise the features of the patients with adult onset benign rheumatoid nodules. METHODS: A 66 year old woman with chronic lymphocytic leukaemia and borderline lepromatous leprosy who presented with subcutaneous elbow nodules, which were at first suspected to represent either progression of her haematological disease or leprosy, is described. The clinical characteristics of our patient and previous reports of another 24 subjects with adult onset benign rheumatoid nodules are reviewed. RESULTS: Biopsy of the patient's subcutaneous lesion disclosed the histopathology of a rheumatoid nodule; serological and clinical evaluations for rheumatoid arthritis and other rheumatoid nodule associated systemic diseases were negative. Adult onset benign rheumatoid nodules are clinically and histologically identical to those found in patients with rheumatoid arthritis. They often appeared in women during their 20s, frequently resolved spontaneously or were adequately treated by excision, and recurred in about one third of patients. The lesions were located in the ocular adnexa in 60% of patients. The most common lesional sites in patients with non-ocular benign rheumatoid nodules were the elbows, feet, and knees. None of these patients subsequently developed rheumatoid arthritis or other rheumatoid nodule associated diseases during follow up periods of as long as 20 years. CONCLUSION: The appearance of subcutaneous nodules is often the harbinger of an associated systemic disorder. Although benign rheumatoid nodules occur infrequently in adults, they should be considered in the differential diagnosis of new nodular lesions.

Adult↗

PubMed1981

Borderline low thyroid function and thyroid autoimmunity. Risk factors for coronary heart disease?

Assessments were made of 945 consecutive hospital patients with regard to a relation between borderline low thyroid function (recognised by a slightly raised thyroid stimulating hormone), thyroid autoimmunity, serum cholesterol, and coronary heart disease. Men and women with a thyroid autoimmunity, serum cholesterol, and coronary heart disease. Men and women with a thyroid stimulating hormone of 4.0 mU/l or over had a higher prevalence of coronary heart disease than did age-matched controls, and this difference was significant in women. The excess of coronary heart disease was not explained by an excess of other risk factors such as a high cholesterol, hypertension, smoking, and diabetes. Women with thyroid antibodies had a slightly higher prevalence of coronary heart disease despite the unexpected finding of a lower serum cholesterol. The data point to an association between borderline thyroid function and autoimmunity and coronary heart disease which is not mediated through a raised serum cholesterol.

Adult↗