Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Per Olof Janson is active.

Publication


Featured researches published by Per Olof Janson.


Fertility and Sterility | 1992

Women with polycystic ovary syndrome wedge resected in 1956 to 1965: a long-term follow-up focusing on natural history and circulating hormones.

Eva Dahlgren; Saga Johansson; Göran Lindstedt; Folke Knutsson; Anders Odén; Per Olof Janson; Lars-Åke Mattson; Nils Crona; Per-Arne Lundberg

OBJECTIVE To determine if the hormonal imbalance in women with polycystic ovary syndrome (PCOS) continues into and after menopause and to analyze factors constituting an increased risk for developing metabolic disorders. DESIGN The study was a transectional retrospective cohort follow-up of patients with PCOS. SETTING The women with PCOS were recruited from hospital clinics, and referents were randomized from a population study of women. PARTICIPANTS Thirty-three women ages 40 to 59 years with ovarian histopathology typical of PCOS at wedge resection 22 to 31 years previously; 132 age-matched referents were analyzed. MAIN OUTCOME MEASURES Clinical data were collected via a questionnaire supplemented with an interview in connection to a clinical examination that also included fasting venous sampling. RESULTS Infertility, hirsutism, and oligomenorrhea were more common among the subjects with PCOS, but there was a considerable spontaneous restitution of cyclic regularity with time. Women with PCOS were more often hysterectomized and entered menopause later compared with referents. The hormone data show a typical profile for PCOS. Compared with referents women with PCOS showed marked increase in prevalence of central obesity, higher basal serum insulin concentrations, and a higher prevalence of diabetes mellitus and hypertension. CONCLUSION Perimenopausal women with PCOS have an increased morbidity in hypertension and diabetes mellitus that adds to the classic symptoms, such as anovulation, hirsutism, and infertility.


Acta Obstetricia et Gynecologica Scandinavica | 1992

Polycystic ovary syndrome and risk for myocardial infarction: Evaluated from a risk factor model based on a prospective population study of women

Eva Dahlgren; Per Olof Janson; S. Johansson; Leif Lapidus; A. Odén

In order to estimate whether women with polycystic ovary syndrome (PCOS) have an increased risk of developing myocardial infdrction, a risk factor model was applied on 33 women with PCOS and 132 age matched referents.


Clinical Chemistry and Laboratory Medicine | 1998

Follitropin (FSH) Deficiency in an Infertile Male due to FSHβ Gene Mutation. A Syndrome of Normal Puberty and Virilization but Under-developed Testicles with Azoospermia, Low FSH but High Lutropin and Normal Serum Testosterone Concentrations

Göran Lindstedt; Ernst Nyström; Clare Matthews; Ingrid Ernest; Per Olof Janson; Krishna Chatterjee

Abstract We studied a man who sought medical attention at age 28 years because of infertility in both his first and second marriages. His sexual development appeared to have been normal, with normal puberty and virilization, and normal libido and sexual potency. At examination, his testicles were small and soft; otherwise he had a normal physical appearance. Evaluations revealed azoospermia, undetectable in serum before and after 100 μg of intravenously administered gonadotrophin releasing hormone, but moderately elevated lutropin concentration with a brisk rise after gonadotrophin releasing hormone. The α subunit concentration was normal before and after gonadotrophin releasing hormone; that of inhibin B was very low. Analysis of the follitropin β gene, exon 3, revealed a Cys82 → Arg mutation (TGT → CGT). Judging from studies of the biosynthesis of the chorionic gonadotrophin β subunit one may conclude that inability to form the first intramolecular disulphide bond in the follitropin β subunit results in an abnormal tertiary structure during follitropin β biosynthesis with extensive intracellular degradation of the products, inability to associate with the α subunit and defective glycosylation, as well as inability to form a biologically active hormone. This first male case of follitropin deficiency thus defines a new syndrome of male infertility.


The Journal of Clinical Endocrinology and Metabolism | 2009

Gender Role Behavior, Sexuality, and Psychosocial Adaptation in Women with Congenital Adrenal Hyperplasia due to CYP21A2 Deficiency

Louise Frisén; Anna Nordenström; Henrik Falhammar; Helena Filipsson; Gundela Holmdahl; Per Olof Janson; Marja Thorén; Kerstin Hagenfeldt; Anders Möller; Agneta Nordenskjöld

CONTEXT Gender-atypical behavior has been described in young girls as well as in women with congenital adrenal hyperplasia (CAH) due to a CYP21A2 deficiency. OBJECTIVE The aim of the study was to assess health-related, psychosexual, and psychosocial parameters and correlate the results to CYP21A2 genotype. DESIGN AND PARTICIPANTS Sixty-two Swedish women with CAH and age-matched controls completed a 120-item questionnaire and a validated quality of life instrument [psychological general well-being (PGWB) formula] to identify psychosexual and psychosocial parameters. The patients were divided into four CYP21A2 genotype groups. RESULTS The women with CAH held more male-dominant occupations (30%) compared to controls (13%) (P = 0.04), especially those in the null genotype group (55%) (P = 0.006). They also reported a greater interest in rough sports (74%) compared to controls (50%) (P = 0.007). Eight women with CAH (14%) reported a prime interest in motor vehicles, compared to none of the controls (P = 0.002). Non-heterosexual orientation was reported by 19% of women with CAH (P = 0.005), 50% in the null genotype group (P = 0.0001), 30% in I2 splice (NS), and 5% in I172N (NS). PGWB total score did not differ between patients and controls. CONCLUSION We identified increased gender-atypical behavior in women with CAH that could be correlated to the CYP21A2 genotype. This speaks in favor of dose-dependent effects of prenatal androgens on the development of higher brain functions. The impact of the disease on upbringing and interpersonal relationships did not correlate with disease severity, indicating that other factors, such as coping strategies, are important for psychosocial adaptation. This illustrates the need for psychological support to parents and patients.


American Journal of Physiology-endocrinology and Metabolism | 2008

Is polycystic ovary syndrome associated with high sympathetic nerve activity and size at birth

Yrsa Bergmann Sverrisdóttir; Tove Mogren; Josefin Kataoka; Per Olof Janson; Elisabet Stener-Victorin

Polycystic ovary syndrome (PCOS) is a common endocrine and metabolic disturbance among women of reproductive age and is proposed to be linked with size at birth and increased prevalence of cardiovascular disease. A disturbance in the sympathetic nervous system may contribute to the etiology of PCOS. This study evaluates sympathetic outflow in PCOS and its relation to size at birth. Directly recorded sympathetic nerve activity to the muscle vascular bed (MSNA) was obtained in 20 women with PCOS and in 18 matched controls. Ovarian ultrasonographic evaluation, biometric, hormonal, and biochemical parameters were measured, and birth data were collected. Women with PCOS had increased MSNA (30 +/- 8 vs. 20 +/- 7 burst frequency, P < 0.0005) compared with controls. MSNA was positively related to testosterone (r = 0.63, P < 0.005) and cholesterol (r = 0.55, P = 0.01) levels in PCOS, which, in turn, were not related to each other. Testosterone level was a stronger predictor of MSNA than cholesterol. Birth size did not differ between the study groups. This is the first study to directly address sympathetic nerve activity in women with PCOS and shows that PCOS is associated with high MSNA. Testosterone and cholesterol levels are identified as independent predictors of MSNA in PCOS, although testosterone has a stronger impact. The increased MSNA in PCOS may contribute to the increased cardiovascular risk and etiology of the condition. In this study, PCOS was not related to size at birth.


Acta Obstetricia et Gynecologica Scandinavica | 2000

Effects of electro-acupuncture on anovulation in women with polycystic ovary syndrome

Elisabet Stener-Victorin; Urban Waldenström; Ulrika Tägnfors; Thomas Lundeberg; Göran Lindstedt; Per Olof Janson

Background. The present study was designed to evaluate if electro‐acupuncture (EA) could affect oligo‐/anovulation and related endocrine and neuroendocrine parameters in women with polycystic ovary syndrome (PCOS).


Fertility and Sterility | 1983

Collection of human oocytes by the use of sonography

Matts Wikland; Lars Nilsson; Roger Hansson; Lars Hamberger; Per Olof Janson

A technique for ultrasonically guided percutaneous oocyte aspiration was developed utilizing standard real-time, linear-array ultrasound equipment. Forty-four patients attending our in vitro fertilization and embryo transfer (IVF-ET) program were included in this study. In 38 patients, follicular puncture was performed under general anesthesia and in 6 cases performed under local anesthesia. Fifty-two follicles with a mean diameter greater than or equal to 18 mm were punctured, and 40 mature oocytes were recovered corresponding to a success rate of 77% per follicle. Six of the punctured follicles were considered cystic when the aspirated granulosa cells were examined microscopically and, if these were excluded, the corrected recovery rate was 87% per follicle. In two patients, ovulation had occurred at the time for oocyte collection. In one of these patients, a mature oocyte was, however, recovered from the pouch of Douglas by the use of sonography. On the basis of these results, ultrasonically guided puncture of follicles for collection of human oocytes in our IVF-ET program seems suitable for use in all cases where laparoscopy is presently used and, moreover, in cases with severe adhesions, where laparoscopy may fail.


Biology of Reproduction | 2000

Effects of Electro-Acupuncture on Nerve Growth Factor and Ovarian Morphology in Rats with Experimentally Induced Polycystic Ovaries

Elisabet Stener-Victorin; Thomas Lundeberg; Urban Waldenström; Luigi Manni; Luigi Aloe; Stefan Gunnarsson; Per Olof Janson

Abstract Despite extensive research on the pathogenesis of polycystic ovary syndrome (PCOS), there is still disagreement on the underlying mechanisms. The rat model for experimentally induced polycystic ovaries (PCO)—produced by a single injection of estradiol valerate—has similarities with human PCOS, and both are associated with hyperactivity in the sympathetic nervous system. Nerve growth factor (NGF) is known to serve as a neurotrophin for both the sympathetic and the sensory nervous systems and to enhance the activity of catecholaminergic and possibly other neuron types. Electro-acupuncture (EA) is known to reduce hyperactivity in the sympathetic nervous system. For these reasons, the model was used in the present study to investigate the effects of EA (12 treatments, approximately 25 min each, over 30 days) by analyzing NGF in the central nervous system and the endocrine organs, including the ovaries. The main findings in the present study were first, that significantly higher concentrations of NGF were found in the ovaries and the adrenal glands in the rats in the PCO model than in the control rats that were only injected with the vehicle (oil or NaCl). Second, that repeated EA treatments in PCO rats resulted in concentrations of NGF in the ovaries that were significantly lower than those in non-EA-treated PCO rats but were within a normal range that did not differ from those in the untreated oil and NaCl control groups. The results in the present study provide support for the theory that EA inhibits hyperactivity in the sympathetic nervous system.


American Journal of Physiology-endocrinology and Metabolism | 2011

Impact of electro-acupuncture and physical exercise on hyperandrogenism and oligo/amenorrhea in women with polycystic ovary syndrome: a randomized controlled trial

Elizabeth Jedel; Fernand Labrie; Anders Odén; Göran Holm; Lars Nilsson; Per Olof Janson; Anna-Karin Lind; Claes Ohlsson; Elisabet Stener-Victorin

Polycystic ovary syndrome (PCOS), the most common endocrine disorder in women of reproductive age, is characterized by hyperandrogenism, oligo/amenorrhea, and polycystic ovaries. We aimed to determine whether low-frequency electro-acupuncture (EA) would decrease hyperandrogenism and improve oligo/amenorrhea more effectively than physical exercise or no intervention. We randomized 84 women with PCOS, aged 18-37 yr, to 16 wk of low-frequency EA, physical exercise, or no intervention. The primary outcome measure changes in the concentration of total testosterone (T) at week 16 determined by gas and liquid chromatography-mass spectrometry was analyzed by intention to treat. Secondary outcome measures were changes in menstrual frequency; concentrations of androgens, estrogens, androgen precursors, and glucuronidated androgen metabolites; and acne and hirsutism. Outcomes were assessed at baseline, after 16 wk of intervention, and after a 16-wk follow-up. After 16 wk of intervention, circulating T decreased by -25%, androsterone glucuronide by -30%, and androstane-3α,17β-diol-3-glucuronide by -28% in the EA group (P = 0.038, 0.030, and 0.047, respectively vs. exercise); menstrual frequency increased to 0.69/month from 0.28 at baseline in the EA group (P = 0.018 vs. exercise). After the 16-wk follow-up, the acne score decreased by -32% in the EA group (P = 0.006 vs. exercise). Both EA and exercise improved menstrual frequency and decreased the levels of several sex steroids at week 16 and at the 16-wk follow-up compared with no intervention. Low-frequency EA and physical exercise improved hyperandrogenism and menstrual frequency more effectively than no intervention in women with PCOS. Low-frequency EA was superior to physical exercise and may be useful for treating hyperandrogenism and oligo/amenorrhea.


American Journal of Physiology-regulatory Integrative and Comparative Physiology | 2009

Low-frequency electroacupuncture and physical exercise decrease high muscle sympathetic nerve activity in polycystic ovary syndrome.

Elisabet Stener-Victorin; Elizabeth Jedel; Per Olof Janson; Yrsa Bergmann Sverrisdóttir

We have recently shown that polycystic ovary syndrome (PCOS) is associated with high muscle sympathetic nerve activity (MSNA). Animal studies support the concept that low-frequency electroacupuncture (EA) and physical exercise, via stimulation of ergoreceptors and somatic afferents in the muscles, may modulate the activity of the sympathetic nervous system. The aim of the present study was to investigate the effect of these interventions on sympathetic nerve activity in women with PCOS. In a randomized controlled trial, 20 women with PCOS were randomly allocated to one of three groups: low-frequency EA (n = 9), physical exercise (n = 5), or untreated control (n = 6) during 16 wk. Direct recordings of multiunit efferent postganglionic MSNA in a muscle fascicle of the peroneal nerve before and following 16 wk of treatment. Biometric, hemodynamic, endocrine, and metabolic parameters were measured. Low-frequency EA (P = 0.036) and physical exercise (P = 0.030) decreased MSNA burst frequency compared with the untreated control group. The low-frequency EA group reduced sagittal diameter (P = 0.001), while the physical exercise group reduced body weight (P = 0.004) and body mass index (P = 0.004) compared with the untreated control group. Sagittal diameter was related to MSNA burst frequency (Rs = 0.58, P < 0.005) in the EA group. No correlation was found for body mass index and MSNA in the exercise group. There were no differences between the groups in hemodynamic, endocrine, and metabolic variables. For the first time we demonstrate that low-frequency EA and physical exercise lowers high sympathetic nerve activity in women with PCOS. Thus, treatment with low-frequency EA or physical exercise with the aim to reduce MSNA may be of importance for women with PCOS.

Collaboration


Dive into the Per Olof Janson's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Göran Lindstedt

Sahlgrenska University Hospital

View shared research outputs
Top Co-Authors

Avatar

Lars Nilsson

University of Gothenburg

View shared research outputs
Top Co-Authors

Avatar

Eva Dahlgren

Sahlgrenska University Hospital

View shared research outputs
Top Co-Authors

Avatar

Lars Hamberger

University of Gothenburg

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Researchain Logo
Decentralizing Knowledge