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1.
Eur J Obstet Gynecol Reprod Biol ; 290: 27-37, 2023 Nov.
Article in English | MEDLINE | ID: mdl-37716200

ABSTRACT

BACKGROUND: Following the publication of the European consensus statement on standards for essential colposcopy in 2020, the need for standards relating to more complex and challenging colposcopy practice was recognised. These standards relate to colposcopy undertaken in patients identified through cervical screening and tertiary referrals from colposcopists who undertake standard colposcopy only. This set of recommendations provides a review of the current literature and agreement on care for recognised complex cases. With good uptake of human papillomavirus (HPV) immunisation, we anticipate a marked reduction in cervical disease over the next decade. Still, the expert colposcopist will continue to be vital in managing complex cases, including previous cervical intraepithelial neoplasia (CIN)/complex screening histories and multi-zonal disease. AIMS: To provide expert guidance on complex colposcopy cases through published evidence and expert consensus. MATERIAL & METHODS: Members of the EFC and ESGO formed a working group to identify topics considered to be the remit of the expert rather than the standard colposcopy service. These were presented at the EFC satellite meeting, Helsinki 2021, for broader discussion and finalisation of the topics. RESULTS & DISCUSSION: The agreed standards included colposcopy in pregnancy and post-menopause, investigation and management of glandular abnormalities, persistent high-risk HPV+ with normal/low-grade cytology, colposcopy management of type 3 transformation zones (TZ), high-grade cytology and normal colposcopy, colposcopy adjuncts, follow-up after treatment with CIN next to TZ margins and follow-up after treatment with CIN with persistent HPV+, and more. These standards are under review to create a final paper of consensus standards for dissemination to all EFC and ESGO members.


Subject(s)
Papillomavirus Infections , Uterine Cervical Dysplasia , Uterine Cervical Neoplasms , Female , Pregnancy , Humans , Colposcopy , Papillomavirus Infections/diagnosis , Early Detection of Cancer , Uterine Cervical Dysplasia/diagnosis , Papillomaviridae
3.
Scand J Clin Lab Invest ; 67(3): 257-63, 2007.
Article in English | MEDLINE | ID: mdl-17454839

ABSTRACT

OBJECTIVE: Oral hormone replacement therapy (HRT) has been linked to increased cardiovascular (CVD) morbidity. HRT causes a sustained increase in C-reactive protein (CRP), an excellent marker of subclinical inflammation and CVD. The aim of the study was to support our hypothesis that CRP, which is synthesized in the liver, is not increased in association with transdermal/intrauterine HRT. MATERIAL AND METHODS: A case-control study was performed in which CRP measurements in women receiving levonorgestrel intrauterine system combined with transdermal estradiol (LNG/TDE, n=27) were followed for 9 months or longer. CRP concentrations in these women were compared with those of either oral HRT users (n=20) or controls (n=19). RESULTS: No significant differences were found in CRP concentrations between the LGN/TDE and control groups (1.8+/-1.2 and 1.8+/-1.8 mg/L, respectively). However, CRP was significantly increased in the oral HRT group (5.5+/-2.9 mg/L, p<0.001). CONCLUSIONS: CRP is significantly increased by oral HRT but not by the LNG/TDE combination after 9 months of treatment. This trend may explain the preponderance of some menopausal women on HRT being at increased risk for the development of CVD. Therefore, the use of LNG/TDE is acceptable for relief of severe climacteric symptoms possibly not imposing an increased CVD risk documented upon oral HRT.


Subject(s)
C-Reactive Protein/drug effects , Estradiol/adverse effects , Estrogens, Conjugated (USP)/pharmacology , Hormone Replacement Therapy , Intrauterine Devices, Medicated/adverse effects , Levonorgestrel/pharmacology , Menopause/blood , Administration, Cutaneous , Administration, Oral , Analysis of Variance , Biomarkers , C-Reactive Protein/analysis , Cardiovascular Diseases/etiology , Cardiovascular Diseases/metabolism , Case-Control Studies , Drug Administration Routes , Estradiol/therapeutic use , Estrogens, Conjugated (USP)/adverse effects , Female , Hormone Replacement Therapy/adverse effects , Hormone Replacement Therapy/methods , Humans , Inflammation/blood , Lipids/blood , Medroxyprogesterone Acetate/adverse effects , Medroxyprogesterone Acetate/therapeutic use , Middle Aged , Risk Factors
5.
J Am Geriatr Soc ; 49(1): 65-71, 2001 Jan.
Article in English | MEDLINE | ID: mdl-11207844

ABSTRACT

BACKGROUND: There is a perception that primary care physicians spend less time with older patients and little is known about physician and older patient satisfaction during clinical encounters. OBJECTIVE: To determine how primary care interviews of geriatric patients differ from those of other adults. DESIGN: Descriptive, analytic study. SETTING: Ten primary care sites in the United States and one in Canada, including public, voluntary, and private clinics and practices. PARTICIPANTS: Of the 544 patients, 45.6% were 65 and older and 17.8% were 75 or older. There were 127 participating physicians. MEASUREMENTS: Encounters were audiotaped and analyzed. Patients and physicians also completed exit questionnaires. RESULTS: Interview length increased significantly with age for men but not for women. Physician satisfaction did not change as patient age increased. Patient satisfaction, on the other hand decreased with age among women but not for men. Although physicians' and younger patients' perceptions of health were moderately associated, there was no association for men ages 75 and over. CONCLUSIONS: There is no evidence that physicians spend less time or are more uncomfortable with older patients. Both physician and male patient satisfaction remain stable with increasing patient age, despite greater disparity in patient and physician perceptions of health. Older female patients are less satisfied with physician visits than their younger counterparts, in the absence of changes in interview length or disparities between older female patients and their physicians in health perception.


Subject(s)
Attitude to Health , Family Practice/standards , Patient Satisfaction/statistics & numerical data , Physician-Patient Relations , Adult , Aged , Aged, 80 and over , Attitude of Health Personnel , Canada , Communication , Female , Humans , Male , Medical History Taking , Socioeconomic Factors , Time Factors , United States
6.
Clin Geriatr Med ; 16(1): 175-204, xi, 2000 Feb.
Article in English | MEDLINE | ID: mdl-10723626

ABSTRACT

Communication with dying patients and their families requires special skills to assist them in this extremely stressful period. This article begins with a case that illustrates many of the challenges of communicating with the dying. It then reviews the literature about communication with older patients at the end of life, focusing on physician-patient discussions, decision-making, advance directives, and cultural factors. The article concludes with a practical discussion of problems that physicians may encounter when working with older patients at the end of life and their families and recommendations to improve communication.


Subject(s)
Advance Care Planning , Advance Directives , Attitude to Death , Physician-Patient Relations , Terminal Care/methods , Advance Directive Adherence , Aged , Communication , Empirical Research , Female , Humans , Male , Palliative Care/methods , Patient Participation , Time Factors , Truth Disclosure
8.
Geriatrics ; 52(10): 83-6, 1997 Oct.
Article in English | MEDLINE | ID: mdl-9337807

ABSTRACT

By 1998, a Medicare prospective payment system for home care is expected to be in place. Physicians must become more involved in home care, because they will be held accountable for the patients they refer and the services they order.


Subject(s)
Home Care Services , Patient Care Management/methods , Home Care Services/economics , Home Care Services/standards , Humans , Medicare , Prospective Payment System , United States
9.
J Am Geriatr Soc ; 45(7): 791-6, 1997 Jul.
Article in English | MEDLINE | ID: mdl-9215327

ABSTRACT

OBJECTIVES: To describe the changes in psychoactive drug use in nursing homes after implementation of physical restraint reduction interventions and mandates of the Omnibus Budget Reconciliation Act of 1987 (OBRA '87). METHODS: A secondary analysis was conducted using data from a controlled clinical trial that took place in three nursing homes: a control home, one that received an educational intervention, and one that received an educational/consultation intervention. All three homes were influenced by the OBRA mandates. Complete pre- and 6 months' post-intervention data on use of psychoactive drugs and physical restraints were available for 446 resident subjects. Changes were first analyzed with the resident subjects as the unit of analysis and then using the nursing home ward (n = 16) as the unit of analysis. RESULTS: While physical restraint use declined in the home that received the educational/consultation intervention, neither neuroleptic nor benzodiazepine use increased in any of the homes after the interventions. The percentage of residents taking neuroleptics declined in the control home (18.6% to 11.3%, P = .014). Benzodiazepine use, which was more prevalent than described previously in the literature, declined in all three homes (P < .001). Of those residents whose physical restraints were discontinued, only 2% were started on neuroleptics. When the effect of OBRA mandates on appropriateness of neuroleptic use was examined, the percentage of residents on neuroleptics who lacked an OBRA-approved indication declined from 21.3% to 14.6% in the total sample, and from 39.9% to 8% in the control home. CONCLUSIONS: Interventions to reduce physical restraint did not lead to an increase in psychoactive drug use; further, reduction in both can occur simultaneously. OBRA mandates regarding psychoactive drug use were not uniformly effective, but appear, at minimum, to have increased awareness of the indications for neuroleptics.


Subject(s)
Nursing Homes/legislation & jurisprudence , Psychotropic Drugs/administration & dosage , Restraint, Physical/legislation & jurisprudence , Aged , Aged, 80 and over , Anti-Anxiety Agents/administration & dosage , Antidepressive Agents/administration & dosage , Antipsychotic Agents/administration & dosage , Benzodiazepines , Drug Utilization , Female , Humans , Male , Middle Aged , Nursing Staff/education , Referral and Consultation
11.
Drugs Aging ; 8(3): 162-70, 1996 Mar.
Article in English | MEDLINE | ID: mdl-8720742

ABSTRACT

There is a high prevalence of bacterial infections in long term care facilities (4.4 to 16.2%). This, together with the fact that antimicrobial resistance is a big concern in current medical practice, makes infection control so important in nursing home care. This article covers the mechanisms of antibacterial resistance and focuses on 4 major antibacterial-resistant bacteria. Vancomycin is the treatment of choice for methicillin-resistant Staphylococcus aureus (MRSA). Colonisation with MRSA is not uncommon in nursing homes and eradication is probably not necessary. Any clinically important enterococcal infection should be tested for high-level resistance. An infectious disease consultation should be sought for vancomycin-resistant enterococcal infections. Gram-negative bacilli have developed multi-resistance. Susceptibility testing can identify the most appropriate therapy. Multiresistance should also be considered when treating Streptococcus pneumoniae. Overall, handwashing is highly recommended. Barrier precautions, minimising hospitalisations and avoiding unnecessary personnel rotation can reduce the chance of resistance spread.


Subject(s)
Anti-Bacterial Agents/therapeutic use , Gram-Negative Bacteria/drug effects , Long-Term Care , Methicillin Resistance/physiology , Vancomycin/therapeutic use , Aged , Drug Resistance, Microbial , Enterococcus , Humans , Streptococcus pneumoniae/drug effects
13.
J Am Geriatr Soc ; 43(10): 1155-60, 1995 Oct.
Article in English | MEDLINE | ID: mdl-7560709

ABSTRACT

BACKGROUND AND OBJECTIVES: Frail older adults are especially vulnerable in a health system that is fragmented and fails to focus on preservation or restoration of function. The School of Nursing at the University of Pennsylvania, together with the School of Medicine and the Hospital of the University of Pennsylvania, established the Collaborative Assessment and Rehabilitation for Elders (CARE) Program to meet the needs of this population. We used the British Day Hospital as a model because it provides a comprehensive approach to care and a bridge between acute, home-based, and institutional long-term care. We have designed our program to provide innovative, interdisciplinary care as well as to be reimbursable under current and future payment structures. This nurse-managed, collaborative practice seeks to maximize independent functioning, promote health, and enhance quality of life for chronically ill, frail older adults living in the community whose needs are left unmet by existing services. The program was certified as a Comprehensive Outpatient Rehabilitation Facility (CORF) in December 1993 to maximize reimbursement of services through Medicare and other third party payers. With a Gerontological Nurse Practitioner as care manager, clients receive an intensive, individualized, time-limited program of nursing, rehabilitation, mental health, social, and medical services in one setting several days each week. Additional geriatric services, such as primary care, are available in the same location when needed. SETTING: The program is housed in renovated space devoted to the care of older people. The academic and clinical offices of the University of Pennsylvania's nursing and medical gerontologic and geriatric faculty are in the same building. PARTICIPANTS: We have targeted those persons older than age 65 who have complex health problems and are living at home. Individuals must need multiple services, including at least one rehabilitation therapy, and they must be unsuitable-for inpatient rehabilitation. DESCRIPTION OF THE POPULATION: In its first 8 months of operation, the program received 97 referrals and admitted 53 clients. Clients were, on average, 78 years of age. Over three-fourths (77%) were women and 58% were black. The average stay in the program was 6 weeks. FIM scores, which improved a mean of 2.4 points, were found to lack sensitivity to the functional improvements achieved by clients. CONCLUSION: Under existing Medicare and third party reimbursement policies, it is feasible to establish a nurse-managed comprehensive outpatient rehabilitation program designed to meet the needs of frail older persons. Preliminary data support the beneficial effects of the program as well as the economic feasibility of this approach.


Subject(s)
Frail Elderly , Geriatric Nursing/organization & administration , Outpatient Clinics, Hospital/organization & administration , Patient Care Team/organization & administration , Academic Medical Centers , Activities of Daily Living , Aged , Aged, 80 and over , Female , Geriatric Assessment , Health Promotion , Humans , Male , Middle Aged , Nurse Practitioners , Outpatient Clinics, Hospital/statistics & numerical data , Philadelphia , Program Evaluation , Quality of Life , Rehabilitation/nursing , Reimbursement Mechanisms
14.
Arch Intern Med ; 155(9): 953-7, 1995 May 08.
Article in English | MEDLINE | ID: mdl-7726704

ABSTRACT

BACKGROUND: When inpatients who are on psychiatry services develop hyponatremia, medical consultation is usually required for evaluation and management, thus halting or delaying psychiatric treatment. Risk factors for the development of hyponatremia in this population have not been studied. METHODS: A case-control study of psychiatric inpatients in a tertiary care facility was performed. Sixty-four patients who had a serum sodium level of less than 130 mmol/L were identified; three control subjects were chosen from the inpatient psychiatry service for each case. Risk factors investigated included medications, psychiatric diagnoses, basic demographic variables, and medical comorbidities. RESULTS: Univariate and logistic regression analyses revealed that, in addition to diuretic use (adjusted odds ratio, 8.2; 95% confidence intervals, 2.2 to 30.8), use of fluoxetine (adjusted odds ratio, 21.4; 95% confidence interval, 5.3 to 86.9), tricyclic antidepressants (adjusted odds ratio, 4.9; 95% confidence interval, 1.6 to 15.2), and calcium antagonists (adjusted odds ratio, 4.0; 95% confidence interval, 1.1 to 14.2) were all associated with the development of hyponatremia. Important comorbidities included elevated creatinine levels, chronic obstructive pulmonary disease, hypertension, systolic blood pressure, and diabetes. Although age was significantly associated with hyponatremia in univariate analyses, it was not significant in multivariate analyses. CONCLUSIONS: Among psychiatric patients, hyponatremia is often associated with factors other than psychogenic polydipsia, including medications and medical comorbidities. Although elderly psychiatric inpatients seem to develop hyponatremia more often than younger patients, once drugs and comorbidities are taken into account, age does not appear to be a significant risk factor for hyponatremia in this population.


Subject(s)
Hyponatremia/etiology , Mental Disorders/complications , Adult , Aged , Analysis of Variance , Case-Control Studies , Female , Humans , Hyponatremia/chemically induced , Logistic Models , Male , Middle Aged , Odds Ratio , Risk Factors
15.
Arch Intern Med ; 154(19): 2185-90, 1994 Oct 10.
Article in English | MEDLINE | ID: mdl-7944839

ABSTRACT

BACKGROUND AND METHODS: Although studies have demonstrated that medical rehabilitation patients have many complications that warrant attention, none has attempted to categorize complications by severity. This retrospective cohort study examined the incidence, types, and severity of problems that interrupt rehabilitation and the major risk factors for these events. RESULTS: Of 1075 patients, 359 (33.4%) had acute medical complications on rehabilitation considered severe enough to interrupt treatment. Of the 359 patients, 158 (44%) required an unexpected transfer off rehabilitation. The most common reasons for unexpected transfer were surgical causes (22.8%), followed by infection or fever (17.1%) and by thromboembolic events (16.5%). Logistic regression revealed that major risk factors for complications requiring transfer were a primary diagnosis of deconditioning or nontraumatic spinal cord injury (adjusted odds ratio, 2.7; confidence interval, 1.8 to 4.2), severity of initial disability (adjusted odds ratio, 1.2; confidence interval, 1.1 to 1.3 for every 10-point drop in a Modified Barthel Index), and number of comorbid conditions (adjusted odds ratio, 1.1; confidence interval, 1.0 to 1.2). Risk factors for any complication were similar, but there was an interaction between comorbidity and the degree of functional impairment; in patients who were severely functionally impaired, the number of comorbidities was not as strongly associated with the risk of complications as it was in patients who were less functionally impaired. CONCLUSION: There is a complex relationship among the type of underlying medical impairment, severity of functional limitation, comorbidity, and unanticipated medical or surgical complications that interrupt rehabilitation. The interruptions vary both in type and in severity.


Subject(s)
Fever/epidemiology , Infections/epidemiology , Patient Transfer/statistics & numerical data , Rehabilitation/statistics & numerical data , Thromboembolism/epidemiology , Activities of Daily Living , Aged , Aged, 80 and over , Cohort Studies , Comorbidity , Confidence Intervals , Female , Fever/classification , Fever/etiology , Humans , Incidence , Infections/classification , Infections/etiology , Logistic Models , Male , Middle Aged , Multivariate Analysis , Odds Ratio , Patient Readmission/statistics & numerical data , Retrospective Studies , Risk Factors , Severity of Illness Index , Thromboembolism/classification , Thromboembolism/etiology
16.
Aging (Milano) ; 6(5): 368-71, 1994 Oct.
Article in English | MEDLINE | ID: mdl-7893783

ABSTRACT

Methicillin-resistant Staphylococcus aureus (MRSA) has been detected in nursing homes and long-term care facilities. Studies disagree about the risk of infection with MRSA in colonized patients. MRSA colonization and infection were tracked for one year in all admissions to a 60-bed ward at the Philadelphia VA Nursing Home Care Unit (NHCU) from the time of its opening in June, 1990. Patients and staff were blinded to culture results, and the NHCU followed universal precautions for all patients. Of the first 72 patients, 7 were found to be colonized with MRSA; only one of them was known to have had MRSA prior to NHCU transfer. Three patients died (2 had negative cultures prior to death), and 1 was discharged home. Three patients spontaneously cleared MRSA colonization and lived to the end of the study. Three patients appeared to be colonized by MRSA after admission; subsequent cultures were negative. No patients were infected by MRSA in the NHCU. At the close of the study, one year after the nursing home opened, no patient in the nursing home had a culture positive for MRSA. In conclusion, colonization with MRSA at the time of admission to the nursing home is not uncommon, but patients can spontaneously clear it. Besides, nursing homes that pre-screen only those patients with classic risk factors may be admitting many MRSA-colonized patients. Nonetheless, universal precautions appear to be effective in limiting transmission of MRSA in the nursing home; in this study, MRSA acquisition was sporadic and brief.


Subject(s)
Methicillin Resistance , Nursing Homes , Staphylococcal Infections/microbiology , Staphylococcus/isolation & purification , Aged , Culture Media , Female , Humans , Male , Methicillin/pharmacology , Methicillin/therapeutic use , Middle Aged , Risk Factors , Staphylococcal Infections/drug therapy , Staphylococcus/drug effects
17.
J Gen Intern Med ; 9(4 Suppl 1): S55-63, 1994 Apr.
Article in English | MEDLINE | ID: mdl-8014745

ABSTRACT

Collaborative efforts among health care professionals and institutions at all levels will be essential to the increased production of generalist physicians. There have been many successful collaborations in education and patient care among certifying boards, faculty, physicians in practice, specialists, generalists, and non-physician health professionals, as well as among the three generalist specialties. Recommended strategies to encourage collaboration in the preparation of generalist physicians include: creation of an institutional collaborative curriculum committee; design of a longitudinal curriculum on collaboration for physicians-in-training and other health professionals; implementation of collaborative patient care in ambulatory care teaching clinics; development of integrated systems of care that link inpatient, outpatient, and community-based health services; and education of physicians-in-training in these and other collaborative and co-practice models of patient care.


Subject(s)
Education, Medical , Family Practice/education , Internal Medicine/education , Interprofessional Relations , Pediatrics/education , Adult , Cooperative Behavior , Curriculum , Geriatrics/education , Humans , Internship and Residency , Models, Educational , Physicians, Family/supply & distribution , United States
18.
Hum Immunol ; 38(4): 270-6, 1993 Dec.
Article in English | MEDLINE | ID: mdl-8138422

ABSTRACT

The immunogenetics of celiac disease demonstrates a highly significant association with the HLA class II alleles DQA1*0501 DQB1*0201 encoded in either a cis- or trans-configuration. In Northern Europe, these alleles are found in linkage disequilibrium with DRB1*0301 while in Southern Europe an additional secondary association through linkage disequilibrium is seen with the combination DRB1*1101/0701. This study examines 34 Ashkenazi Jews with celiac disease and 36 ethnically matched controls to determine alleles at the DRB, DQA1, DQB1, and DPB1 loci using SSO probes in conjunction with gene amplification by the PCR. The results confirm a highly significant association with the DQA1*0501 DQB1*0201 allelic combination (71% celiac vs 8% control individuals; p = 0.00005; chi 2 = 21.4). Of celiac subjects, 29% were negative for the proposed DQ susceptibility alleles, the majority of whom were DRB1*0402 positive (20% overall celiac group). No additional susceptibility was associated at the DRB3 and DPB loci. This study confirms that the MHC-linked celiac disease susceptibility among Ashkenazi Jews is closely associated with the presence of the combination of alleles DQA1*0501 DQB1*0201. However, within this population of relatively high-prevalence celiac disease, 30% of celiac patients do not carry these alleles and are therefore not covered by a single "unifying" hypothesis.


Subject(s)
Celiac Disease/genetics , HLA-D Antigens/genetics , Jews/genetics , Adolescent , Adult , Aged , Celiac Disease/ethnology , Child , Child, Preschool , Genetic Predisposition to Disease , Genotype , HLA-DP Antigens/genetics , HLA-DQ Antigens/genetics , HLA-DR Antigens/genetics , Humans , Infant , Israel , Middle Aged , Polymerase Chain Reaction
19.
Prenat Diagn ; 13(9): 863-71, 1993 Sep.
Article in English | MEDLINE | ID: mdl-8278316

ABSTRACT

The sonographic diagnosis of fetal neural tube defects (NTDs) has been enhanced by the recognition of associated brain and skull anomalies. Previous reports have found these anomalies to be accurate in predicting spina bifida after 16 weeks' gestation, and an inverse correlation was suggested between the presence of these sonographic markers and gestational age. Therefore, we assumed that early second-trimester sonography would be at least as accurate as that performed after 16 weeks' gestation. To examine this hypothesis, we looked for the presence of these cranial sonographic markers suggestive of open NTDs in 8011 low-risk cases, using transvaginal sonography (TVS), between the 12th and 17th week of gestation (menstrual age). Fetal NTDs were identified in ten cases (1.25/1000). The NTDs were cervico-cranial in three, lumbo-sacral in six, and thoracal in one of the ten cases. None of the seven cases examined was dyskaryotic. Cerebellar dysmorphism, 'banana' sign, cerebellar absence, and hypoplasia were detected in all the low NTDs, usually before the detection of the spinal lesion. All the sonographically diagnosed malformations were confirmed by post-abortal examination except in one case, where the patient decided to continue the pregnancy and refused follow-up. We therefore conclude that transvaginal sonographic examination of the fetal skull before the 17th week of gestation is an accurate method for the detection of low NTDs.


Subject(s)
Neural Tube Defects/diagnostic imaging , Ultrasonography, Prenatal , Abortion, Therapeutic , Female , Gestational Age , Humans , Hydrocephalus/diagnostic imaging , Meningocele/diagnostic imaging , Predictive Value of Tests , Pregnancy , Spinal Dysraphism/diagnostic imaging , Twins, Conjoined , Videotape Recording
20.
Environ Health Perspect ; 101(2): 154-64, 1993 Jun.
Article in English | MEDLINE | ID: mdl-8354202

ABSTRACT

Ozone (O3) exposure in vivo has been reported to degrade arachidonic acid (AA) in the lungs of rodents. The O3-degraded AA products may play a role in the responses to this toxicant. To study the chemical nature and biological activity of O3-exposed AA, we exposed AA in a cell-free, aqueous environment to air, 0.1 ppm O3, or 1.0 ppm O3 for 30-120 min. AA exposed to air was not degraded. All O3 exposures degraded > 98% of the AA to more polar products, which were predominantly aldehydic substances (as determined by reactivity with 2,4-dinitrophenylhydrazine and subsequent separation by HPLC) and hydrogen peroxide. The type and amount of aldehydic substances formed depended on the O3 concentration and exposure duration. A human bronchial epithelial cell line (BEAS-2B, S6 subclone) exposed in vitro to either 0.1 ppm or 1.0 ppm O3 for 1 hr produced AA-derived aldehydic substances, some of which eluted with similar retention times as the aldehydic substances derived from O3 degradation of AA in the cell-free system. In vitro, O3-degraded AA induced an increase in human peripheral blood polymorphonuclear leukocyte (PMN) polarization, decreased human peripheral blood T-lymphocyte proliferation in response to mitogens, and decreased human peripheral blood natural killer cell lysis of K562 target cells. The aldehydic substances, but not hydrogen peroxide, appeared to be the principal active agents responsible for the observed effects. O3-degraded AA may play a role in the PMN influx into lungs and in decreased T-lymphocyte mitogenesis and natural killer cell activity observed in humans and rodents exposed to O3.


Subject(s)
Arachidonic Acid/metabolism , Ozone/pharmacology , Aldehydes/metabolism , Arachidonic Acid/pharmacology , Bronchi/cytology , Bronchi/drug effects , Bronchi/metabolism , Cell Line , Chemical Phenomena , Chemistry , Humans , Neutrophils/drug effects
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