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1.
Hum Reprod ; 29(12): 2704-11, 2014 Dec.
Article in English | MEDLINE | ID: mdl-25344069

ABSTRACT

STUDY QUESTION: What do adolescent and young adult survivors of childhood cancer think about the risk of being infertile? SUMMARY ANSWER: The potential infertility, as well as the experience of having had cancer, affects well-being, intimate relationships and the desire to have children in the future. WHAT IS KNOWN ALREADY: Many childhood cancer survivors want to have children and worry about possible infertility. STUDY DESIGN, SIZE, DURATION: For this qualitative study with a cross-sectional design, data were collected through 39 online focus group discussions during 2013. PARTICIPANTS/MATERIALS, SETTING, METHODS: Cancer survivors previously treated for selected diagnoses were identified from The Swedish Childhood Cancer Register (16-24 years old at inclusion, ≥5 years after diagnosis) and approached regarding study participation. Online focus group discussions of mixed sex (n = 133) were performed on a chat platform in real time. Texts from the group discussions were analysed using qualitative content analysis. MAIN RESULTS AND THE ROLE OF CHANCE: The analysis resulted in the main category Is it possible to have a baby? including five generic categories: Risk of infertility affects well-being, Dealing with possible infertility, Disclosure of possible infertility is a challenge, Issues related to heredity and Parenthood may be affected. The risk of infertility was described as having a negative impact on well-being and intimate relationships. Furthermore, the participants described hesitation about becoming a parent due to perceived or anticipated physical and psychological consequences of having had cancer. LIMITATIONS, REASONS FOR CAUTION: Given the sensitive topic of the study, the response rate (36%) is considered acceptable. The sample included participants who varied with regard to received fertility-related information, current fertility status and concerns related to the risk of being infertile. WIDER IMPLICATIONS OF THE FINDINGS: The results may be transferred to similar contexts with other groups of patients of childbearing age and a risk of impaired fertility due to disease. The findings imply that achieving parenthood, whether or not with biological children, is an area that needs to be addressed by health care services. STUDY FUNDING/COMPETING INTERESTS: The study was financially supported by The Cancer Research Foundations of Radiumhemmet, The Swedish Childhood Cancer Foundation and the Doctoral School in Health Care Science, Karolinska Institutet. The authors report no conflicts of interest.


Subject(s)
Focus Groups , Infertility/psychology , Survivors/psychology , Adolescent , Cross-Sectional Studies , Female , Fertility Preservation/psychology , Humans , Male , Quality of Life , Sweden , Young Adult
2.
J Obstet Gynaecol ; 30(6): 553-8, 2010.
Article in English | MEDLINE | ID: mdl-20701500

ABSTRACT

Providing healthcare for women having undergone female genital cutting can present challenges. The women might require special obstetric care, including an anterior episiotomy (defibulation) for infibulated women. This paper explores how Swedish doctors caring for these women describe, explain and reason about their care and relevant policies in a Swedish context. A qualitative study was carried out with 13 chief/senior obstetricians and seven senior house officers. There was little consensus among the interviewed doctors on what constitutes good obstetric care for women with FGC or how care should be provided. Major problems include: inconsistent policy and praxis; uncoordinated care trajectories; diffuse professional role responsibilities; difficulties in monitoring labour and fetal status; and inhibited communication. The data highlight the need for increased awareness and reflective praxis both on the part of individual practitioners, and on an organisational level, which takes account of the special needs of different users.


Subject(s)
Circumcision, Female/ethnology , Health Knowledge, Attitudes, Practice , Quality of Health Care , Delivery of Health Care , Female , Humans , Pregnancy , Pregnancy Complications/ethnology , Sweden
3.
Neuropsychopharmacology ; 17(6): 402-9, 1997 Dec.
Article in English | MEDLINE | ID: mdl-9397428

ABSTRACT

It has been hypothesized that a decrease in dopaminergic presynaptic activity during abstinence or withdrawal is related to relapse in cocaine-dependent subjects (Dackis and Gold 1985; Markou and Koob 1991). This study measured striatal 6-fluorodopa (6-FDOPA) uptake, an index of dopaminergic presynaptic activity, using positron emission tomography (PET) in 11 drug-free cocaine addicts compared to eight normal subjects. Middle abstinence cocaine addicts (n = 5, off cocaine 11-30 days) had significantly lower striatal 6-FDOPA uptake compared to normal controls or early abstinence cocaine addicts (n = 6, off cocaine 1-10 days). The cocaine-dependent subjects (n = 11) showed a significant negative correlation between days off cocaine and striatal 6-FDOPA uptake. The results suggest that during abstinence from cocaine there is a delayed decrease in dopamine terminal activity in the striatum.


Subject(s)
Cocaine/adverse effects , Dihydroxyphenylalanine/analogs & derivatives , Narcotics/adverse effects , Neostriatum/metabolism , Substance Withdrawal Syndrome/metabolism , Adult , Brain Chemistry/drug effects , Dihydroxyphenylalanine/pharmacokinetics , Female , Fluorine Radioisotopes , Humans , Male , Neostriatum/drug effects , Substance Withdrawal Syndrome/psychology , Tomography, Emission-Computed
4.
Eur J Cancer Prev ; 10(5): 429-42, 2001 Oct.
Article in English | MEDLINE | ID: mdl-11711758

ABSTRACT

Quantitative findings regarding factors that affect attendance in population-based outreach mammography programmes need to be complemented by descriptive data. The aim of this study was to obtain descriptive insights into the meanings that Swedish women attach to mammograms and their rationales for attending or not attending mammography screening. For this purpose a total of 31 women were recruited to eight focus group discussions. Through inductive analysis, six main themes were identified as important issues in reasoning about attendance or non-attendance in mammography screening: negative experiences, perceived risk factors, knowledge of one's own body, perceived problems with mammography, political, ideological and moral reasoning, and involuntary non-attendance, due to the inability of the screening programme to cover some women (e.g. those with breast implants). In conclusion, there is a need to reinforce the information that mammography is an examination aiming at detecting lumps at an asymptomatic stage. However, the nature and amount of information the women themselves desire is inconsistent. Furthermore, the personal encounter between the individual woman and the staff seems to be of particular importance. An improved dialogue appears an attractive way of adapting the screening situation to meet the varied needs and expectations of the women who are invited.


Subject(s)
Mammography/statistics & numerical data , Mass Screening/statistics & numerical data , Patient Acceptance of Health Care/statistics & numerical data , Adult , Aged , Female , Focus Groups , Humans , Mammography/psychology , Middle Aged , Risk Factors , Sweden
5.
Cancer Nurs ; 23(5): 392-400, 2000 Oct.
Article in English | MEDLINE | ID: mdl-11037961

ABSTRACT

Nurse-midwives are responsible for taking Papanicolaou (Pap) smears in Swedish population-based cervical cancer screening programs. A research project examining the screening program from the perspective of different stakeholders includes an interview study of 21 midwives working in Stockholm. This article explores the way the midwives describe cancer-related knowledge and aspects of screening, contrasting this with relevant findings from a substudy of 66 healthy women participating in screening. A semistructured interview guide with open-ended questions was used to investigate ideas about benefits and risks in the screening program, risk factors for cervical cancer, the reliability of the test itself, sources of information/knowledge relevant for cervical cancer screening, and the manner in which the midwife described her role in the screening program. The transcripts of the audiotaped interviews were analyzed thematically using a team approach. The interviewed midwives showed a great deal of consensus in their descriptions of lacking familiarity with cervical cancer and its prevention and treatment. The midwives said they lack recent education and knowledge, often avoiding use of the word "cancer" with women attending screening. It seems that the midwives experienced little professional guidance in discussing cancer-related issues with women attending the screening program. In this study, they appeared to rely on personal knowledge, values, and experience instead.


Subject(s)
Health Knowledge, Attitudes, Practice , Neoplasms/prevention & control , Nurse Midwives , Papanicolaou Test , Patient Education as Topic , Vaginal Smears/nursing , Adult , Female , Humans , Middle Aged , Sweden
6.
Acta Otolaryngol ; 121(7): 854-8, 2001 Oct.
Article in English | MEDLINE | ID: mdl-11718252

ABSTRACT

Tonsillectomy is one of the most frequent surgical procedures carried out on children. Obstructive sleep apnea syndrome, caused by tonsillar hypertrophy, has been attracting increasing interest and tonsillectomy is often performed as a result of this indication. Regardless of the indication, the main aim of tonsillectomy has always been to remove the tonsils completely. The present study was undertaken in order to investigate the effect of two different surgical techniques, tonsillectomy and tonsillotomy, on clinical symptoms in children with symptoms of obstructive sleep apnea syndrome due to tonsillar hypertophy. The study was conducted as a prospective, randomized trial comparing the clinical effects of standard tonsillectomy and tonsillotomy using a CO2 laser. Forty-three children aged 2-9 years were included. Both groups of patients experienced comparable relief from symptoms of snoring and apneas at follow-up after 3 months and 2 years. There was no significant statistical difference between the two groups of patients in terms of both short- and long-term effects on clinical symptoms. Tonsillotomy caused no measurable bleeding during surgery. Postoperative pain and distress were less pronounced in the tonsillotomy group according to visual analog scale evaluations made by patients, parents and nursing staff. In conclusion tonsillotomy appears to be the less traumatic surgical method in cases of upper airway obstruction in children caused by tonsillar hypertrophy.


Subject(s)
Palatine Tonsil/pathology , Palatine Tonsil/surgery , Tonsillectomy/methods , Child , Child, Preschool , Follow-Up Studies , Humans , Hypertrophy/complications , Hypertrophy/pathology , Hypertrophy/surgery , Prospective Studies , Sleep Apnea, Obstructive/etiology
7.
Qual Health Res ; 9(1): 45-60, 1999 Jan.
Article in English | MEDLINE | ID: mdl-10558358

ABSTRACT

This article describes a qualitative research project on secondary cancer prevention that was conducted using a multidisciplinary team and that was inspired by perspectives from feminist research and fourth-generation evaluation. A screening program for cervical cancer was investigated from the perspective of different stakeholders through a series of substudies using a variety of qualitative approaches, in order to have a broad basis for consideration and negotiation of improvements. The first sections of this article describe the theoretical and methodological basis for the project, which triangulates a variety of qualitative and quantitative research strategies, whereas the latter sections describe some of our experiences, positive and negative, as a research team (and thus also as stakeholders) in actually conducting the studies.


Subject(s)
Health Services Research/methods , Patient Care Team , Uterine Cervical Neoplasms/prevention & control , Female , Group Processes , Humans , Interpersonal Relations , Interviews as Topic , Risk , Sweden/epidemiology , Urban Population , Uterine Cervical Neoplasms/epidemiology , Vaginal Smears
8.
J Dev Physiol ; 15(3): 161-8, 1991 Mar.
Article in English | MEDLINE | ID: mdl-1940143

ABSTRACT

After unilateral uterine artery ligation in midpregnancy twelve guinea-pig does were anesthetized at 63 days of gestation. The ST waveform of the fetal electrocardiogram and the short term heart rate variability were studied during normoxia and in response to acute hypoxia in growth retarded fetuses (n = 12, mean +/- SEM, 58.5 +/- 3.9 g) and their normal sized littermates (n = 12, 94.3 +/- 3.5 g). Hypoxia was induced by letting the doe breathe a low-oxygen gas mixture. After 10 min of hypoxia fetal blood was sampled by decapitation and blood gases, acid-base status and catecholamine concentrations were analyzed. The does responded to decrease in inspired oxygen concentration with changes in oxygen tension (13.8 +/- 0.8 to 4.3 +/- 0.2 kPa) and oxygen saturation (99.9 +/- 0.1% to 70.5 +/- 1.8%). Fetal blood gases and plasma catecholamine concentrations did not differ between the groups. In the growth retarded group standard bicarbonate was significantly lower compared to controls. The T/QRS ratio (the quotient between T wave height and QRS peak to peak amplitude) was normal and similar in both groups prior to the hypoxic period. In response to hypoxia T/QRS ratio increased in the normal sized group and T/QRS was correlated to carbon dioxide tension, oxygen saturation, pH, lactate, standard bicarbonate concentration, standard base excess and plasma noradrenaline concentration, respectively. The growth retarded fetuses presented a completely different pattern where 7 out of 12 fetuses showed a biphasic ST waveform during hypoxia with depression and downward sloping of the ST segment and negative T wave.(ABSTRACT TRUNCATED AT 250 WORDS)


Subject(s)
Catecholamines/blood , Electrocardiography , Fetal Growth Retardation/physiopathology , Fetal Hypoxia/physiopathology , Heart Rate, Fetal , Animals , Arteries , Bicarbonates/blood , Carbon Dioxide/blood , Female , Fetal Growth Retardation/complications , Fetal Hypoxia/complications , Guinea Pigs , Oxygen/blood , Pregnancy , Uterus/blood supply
9.
J Dev Physiol ; 18(3): 99-103, 1992 Sep.
Article in English | MEDLINE | ID: mdl-1301418

ABSTRACT

The PR and RR intervals and T wave amplitude of the fetal lamb electrocardiogram were studied during acute hypoxemia produced by reduction of the maternal placental blood flow. Five chronically-instrumented fetal lambs (124 to 143 days of gestation) were subjected to acute hypoxemia (observations = 13) through complete occlusion of the maternal aorta for 60 s. The fetuses responded to the occlusion with a fall in oxygen tension (2.18 +/- 0.12 kPa to 1.11 +/- 0.14 kPa, SEM, P < 0.001) and oxygen saturation (48 +/- 4% to 19 +/- 4%, P < 0.001). Modest changes of pH (7.37 +/- 0.05 to 7.35 +/- 0.01, p), carbon dioxide tension (5.79 +/- 0.15 kPa to 6.17 +/- 0.14 kPa, P < 0.001) and plasma lactate concentration (2.1 +/- 0.6 mmol/l to 2.2 +/- 0.6 mmol/l, ns) occurred. The PR interval showed a triphasic pattern following occlusion. Initially, and simultaneously with the onset of the RR interval lengthening, a prolongation of the PR interval occurred (P < 0.01) with a peak value after 41 +/- 3 s after occlusion. Following this transient prolongation, the PR interval shortened concurrently with a maximum lengthening of the RR interval (P < 0.001) 2 +/- 3 s after the end of the occlusion. A maximum PR shortening (P < 0.001) occurred 27 +/- 5 s after occlusion followed by a prolongation of the PR interval (P < 0.001) with a peak value 203 +/- 21 s after release of the occlusion.(ABSTRACT TRUNCATED AT 250 WORDS)


Subject(s)
Electrocardiography , Fetal Heart/physiopathology , Fetal Hypoxia/physiopathology , Hypoxia/physiopathology , Acute Disease , Animals , Blood Pressure , Fetus/physiology , Sheep
10.
J Dev Physiol ; 13(5): 289-93, 1990 May.
Article in English | MEDLINE | ID: mdl-2286752

ABSTRACT

Electrocardiogram waveform, short term heart rate variability and catecholamine concentrations were studied with maternally-induced anesthesia in eleven growth-retarded guinea-pig fetuses and their normal-sized littermates at 63 days of gestation. Intrauterine growth retardation was induced by unilateral uterine artery ligation performed between day 32 and 35. In the growth-retarded group fetal weight was reduced by 45%. Blood gases, acid-base status and oxygen content were similar in the two groups. The growth-retarded guinea-pig fetuses were hypoglycemic and demonstrated a rise in hemoglobin concentration. The T/QRS ratio (T wave amplitude/QRS amplitude) was similar in both groups. The short-term heart rate variability was significantly reduced in the growth-retarded group. Plasma catecholamine concentrations were increased in growth-retarded fetuses but differed only significantly for noradrenaline compared to controls. We suggest that similar T/QRS ratio in both groups of fetuses indicates that aerobic myocardial metabolism is maintained among growth-retarded fetuses. The mechanism behind the reduced variability is unclear.


Subject(s)
Catecholamines/blood , Fetal Growth Retardation/physiopathology , Heart Rate , Heart/physiopathology , Acid-Base Equilibrium , Animals , Birth Weight , Blood Gas Analysis , Blood Glucose/analysis , Electrocardiography , Epinephrine/blood , Female , Fetal Growth Retardation/blood , Guinea Pigs , Hemoglobins/analysis , Norepinephrine/blood , Oxygen/blood , Pregnancy
11.
J Nurse Midwifery ; 43(6): 530-40, 1998.
Article in English | MEDLINE | ID: mdl-9871385

ABSTRACT

In Sweden, nurse-midwives in primary health care are responsible for taking Papanicolaou smears in population-based cervical cancer screening programs. This article discusses the manner in which a group of nurse-midwives, working with the cervical cancer screening program, view both opportunities and burdens inherent in their work. Semistructured interviews were conducted with 21 nurse-midwives engaged in screening at seven antenatal health care centers in demographically different parts of Stockholm, using a team approach to collect and inductively analyze the interviews. Results indicate discrepancies between ideals guiding the midwives and their practice. Positive aspects described by the midwives appear to be related to an ideology of care, whereas perceived burdens include the midwives' sense of powerlessness, lack of congruence between midwives' ideology and screening organization, and lack of professional familiarity with cancer. Several of these features can be related to issues that are challenges for many health care practitioners today, even in other settings. Our conclusion is that the screening program has latent potential for further development of the role of the nurse-midwife as an advocate for women throughout the lifespan and in a variety of situations.


Subject(s)
Job Satisfaction , Mass Screening , Nurse Midwives , Papanicolaou Test , Primary Nursing , Uterine Cervical Neoplasms/prevention & control , Vaginal Smears , Female , Humans , Mass Screening/methods , Population Surveillance , Surveys and Questionnaires , Sweden , Urban Health
12.
Psychooncology ; 10(1): 76-87, 2001.
Article in English | MEDLINE | ID: mdl-11180579

ABSTRACT

OBJECTIVE: This explorative study aims at investigating how 'healthy' women describe and reason about participation in a cervical cancer screening programme in Sweden. The study is part of a multidisciplinary research project studying a population-based cervical cancer-screening programme from the perspective of different actors. SETTING AND METHODS: Data collection took place at three ante-natal health centres (ANHCs) in demographically diverse areas in the Stockholm region in spring 1995. Interviews were conducted and audiotaped with 66 'healthy' women at the ANHCs immediately before taking a Papanicolau test. Open questions such as 'Why have you come here today?' and 'What kind of test will you take?' were used to initiate the interview. Verbatim transcripts were analysed with a modified phenomenographical method to identify and describe qualitatively different ways of understanding cervical cancer screening. RESULTS: Four different ways of reasoning about cervical cancer screening are described, with only one similar to the biomedical rationale for screening with focus on attending for the test/results. Two types of reasoning refer to the invitation letter as a catalyst, with one emphasizing benefits in attendance and the second emphasizing hinders to attendance. A final way of reasoning focuses on the individual's own proactive role in prevention. Common themes are also identified. IMPLICATIONS: This study complements the research literature by providing a better knowledge base of the variations in reasoning among women attending screening, often seen as a homogenous group. It can contribute to better adapting the screening situation to the varied needs and expectations of the women who attend.


Subject(s)
Mass Screening/psychology , Motivation , National Health Programs/organization & administration , Patient Acceptance of Health Care/psychology , Stress, Psychological/etiology , Uterine Cervical Neoplasms/prevention & control , Uterine Cervical Neoplasms/psychology , Vaginal Smears/psychology , Women/psychology , Adult , Female , Humans , Mass Screening/statistics & numerical data , Middle Aged , Sampling Studies , Surveys and Questionnaires , Sweden/epidemiology
13.
Acta Anaesthesiol Scand ; 42(2): 204-10, 1998 Feb.
Article in English | MEDLINE | ID: mdl-9509204

ABSTRACT

BACKGROUND: We studied the effect of desflurane (DES) and isoflurane (ISO) on heart rate variability (HRV) using power spectral analysis (PSA) of RR-interval in 30 patients undergoing arthroscopy, prior to induction, during anaesthesia and up to 3 h of recovery. PSA can distinguish low-frequency (LF) component and respiratory sinus arrhythmia (RSA) that are known to reflect predominantly sympathetic and parasympathetic activity, respectively. METHODS: After premedication with diclofenac and midazolam the anaesthesia was induced with propofol and maintained during spontaneous ventilation with either DES or ISO added to a mixture of nitrous oxide and oxygen. ECG and transthoracic impedance respirometer data were recorded. Power spectra were calculated with an autoregressive modelling method. RESULTS; Total power (PTOT) and individual power in two frequency bands of the HRV spectrum (PLF, 0.05-0.15 Hz and PRSA) decreased after induction of anaesthesia in both groups. At 60, 120 and 180 min of recovery the PTOT was back to control-value in the DES group but remained reduced in the ISO group. Calculated as normalised units, the PLF (nPLF) predominated over the PRSA (nPRSA) during control situations and during recovery. The reverse was the case during maintenance of anaesthesia. Thirty minutes after induction and during surgical stress the ISO group showed higher heart rate compared to the DES group as well as compared to control. CONCLUSION: DES and ISO produced similar alterations in studied parameters during the maintenance of anaesthesia. The differences observed between the groups during recovery may indicate an early intact neural reflex control system among the subjects exposed to DES. These results suggest that DES and ISO reduce the total autonomic neural system activity and alter the balance between sympathetic and parasympathetic activities in a comparable way during maintenance of anaesthesia. A more rapid recovery phase among the subjects exposed to DES is linked to differences in pharmacokinetic properties of the inhalation agents.


Subject(s)
Anesthetics, Inhalation/pharmacology , Heart Rate/drug effects , Isoflurane/analogs & derivatives , Isoflurane/pharmacology , Adult , Arthroscopy , Desflurane , Humans , Male , Respiration/drug effects
14.
Am J Obstet Gynecol ; 160(5 Pt 1): 1245-50, 1989 May.
Article in English | MEDLINE | ID: mdl-2729402

ABSTRACT

The aim of the present study was to investigate the changes in electrocardiographic waveform and the release of catecholamines in the fetal lamb during nonacidemic fetal hypoxia. Chronically instrumented fetal lambs were subjected to reproducible hypoxia by reduction of the maternal placental blood flow. This was achieved by complete obstruction of the maternal aorta for 60 seconds. The fetuses were divided into an immature (119 to 126 days, n = 10) and a mature group (129 to 141 days, n = 6). Both groups of fetuses had a marked fall in oxygen tension (from 2.43 +/- 0.12 to 1.46 +/- 0.12 and 2.22 +/- 0.15 to 1.11 +/- 0.17 kilopascals [kPa] in the immature and mature groups, respectively) and in oxygen saturation (from 48% +/- 3% to 17% +/- 2% and 49% +/- 3% to 15% +/- 3%, respectively), but only modest changes occurred in pH and carbon dioxide tension. Basal fetal catecholamine concentrations did not differ between the groups but increased more significantly in the mature group with acute hypoxia. An increase in the T wave amplitude of the fetal electrocardiogram occurred in both groups during the latter part of occlusion with peak values shortly after removal of the occlusion. A linear correlation was found between the plasma epinephrine concentration and the T/QRS ratio in the mature group. Fetuses in both groups showed a marked bradycardia of similar magnitude during the occlusion but differed during the early phase of heart rate recovery by a slower acceleration of heart rate in the mature group. In connection with this marked bradycardia, the mature group showed a significant rise in mean arterial blood pressure at end of the occlusion. We suggest that fetal maturity has a significant influence no only on the release of catecholamines during nonacidemic hypoxia but also on the cardiovascular reaction pattern and changes in the ST waveform.


Subject(s)
Catecholamines/blood , Electrocardiography/veterinary , Fetal Hypoxia/veterinary , Sheep Diseases/physiopathology , Acute Disease , Animals , Blood Pressure , Disease Models, Animal , Female , Fetal Blood/analysis , Fetal Hypoxia/blood , Fetal Hypoxia/physiopathology , Gestational Age , Heart Rate, Fetal , Pregnancy , Sheep , Sheep Diseases/blood
15.
J Biomed Eng ; 10(4): 351-3, 1988 Jul.
Article in English | MEDLINE | ID: mdl-3236856

ABSTRACT

Recording the fetal ECG as a means of fetal monitoring during labour has been investigated by many researchers. Different signal processing methods have been used, making comparisons difficult so that agreement on several topics has not been reached. We suggest the basis of a standard method of recording and processing the signal which we believe will be acceptable to the research and clinical communities.


Subject(s)
Electrocardiography/standards , Fetal Heart/physiology , Fetal Monitoring/standards , Labor, Obstetric , Signal Processing, Computer-Assisted , Animals , Electrodes/standards , Female , Pregnancy , Sheep
16.
Int J Biomed Comput ; 33(3-4): 199-207, 1993 Nov.
Article in English | MEDLINE | ID: mdl-8307652

ABSTRACT

In a chronically instrumented fetal lamb the effect on heart rate variability of noradrenaline as well as hypoxemia is studied by the use of power spectral analysis. Subsequent to both noradrenaline infusion and hypoxemia the very low frequency components of the variability are markedly decreased as compared with control conditions. After hypoxemia also a high frequency peak appears in the spectrum.


Subject(s)
Heart Rate, Fetal/drug effects , Heart Rate, Fetal/physiology , Hypoxia/physiopathology , Norepinephrine/pharmacology , Acute Disease , Algorithms , Animals , Blood Pressure/drug effects , Blood Pressure/physiology , Bradycardia/physiopathology , Data Interpretation, Statistical , Electrocardiography/drug effects , Female , Fetus , Heart Rate/physiology , Infusions, Intravenous , Norepinephrine/administration & dosage , Pregnancy , Sheep , Signal Processing, Computer-Assisted
17.
Synapse ; 6(2): 146-53, 1990.
Article in English | MEDLINE | ID: mdl-2237777

ABSTRACT

Long-term administration of the atypical neuroleptic clozapine (CLZ) poses a much lower risk of extrapyramidal side effects (EPS) than does the use of typical neuroleptics such as haloperidol (HAL). To investigate the neural mechanisms of the differing CNS activities of these two drugs, we used quantitative autoradiography to measure changes in dopamine and serotonin receptors in rats after injection with CLZ or HAL for 21 days at clinically relevant dose ratios. Levels of D1, D2, and 5-HT2 receptors were determined in frontal cortex, caudate-putamen, and nucleus accumbens. Rats that received CLZ chronically showed CNS receptor changes markedly different from those in chronic HAL-treated animals. Whereas rats treated chronically with HAL showed enhanced striatal D2 binding (average increase of 42%), those treated with CLZ did not. In contrast, chronic CLZ, but not chronic HAL, induced enhanced striatal D1 binding (average increase of 43%). Finally, CLZ treatment decreased 5-HT2 receptor binding by an average of 37%, while HAL had no significant effect. The effects of chronic HAL or CLZ treatment on receptors were similar in all forebrain areas examined. However, since D1 and 5-HT2 receptors are more abundant than D2 sites in limbic and neocortical areas, the preferential modulation of D1 and 5-HT2 receptors by CLZ suggests a greater impact of this atypical neuroleptic on activity of the limbic system than that achieved by the typical neuroleptic, HAL. These findings suggest that the clinical profile of atypical neuroleptics such as CLZ may be attributed to their effects on a receptor profile differing in pharmacological characteristics and anatomical distribution from that affected by typical neuroleptics.


Subject(s)
Brain/metabolism , Clozapine/pharmacology , Haloperidol/pharmacology , Receptors, Dopamine/drug effects , Receptors, Serotonin/drug effects , Animals , Autoradiography , Brain/drug effects , Caudate Nucleus/drug effects , Caudate Nucleus/metabolism , Male , Putamen/drug effects , Putamen/metabolism , Rats , Rats, Inbred Strains
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