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Featured researches published by Shawna Johnston.


Regional Anesthesia and Pain Medicine | 2012

Impact of perioperative pain intensity, pain qualities, and opioid use on chronic pain after surgery: a prospective cohort study.

Elizabeth G. VanDenKerkhof; Wilma M. Hopman; David H. Goldstein; Rosemary Wilson; Tanveer Towheed; Miu Lam; Margaret B. Harrison; Michelle L. Reitsma; Shawna Johnston; James D. Medd; Ian Gilron

Background and Objectives A better understanding of the pathogenesis of chronic postsurgical pain is needed in order to develop effective prevention and treatment interventions. The objective of this study was to evaluate the incidence and risk factors for chronic postsurgical pain in women undergoing gynecologic surgery. Methods Pain characteristics, opioid consumption, and psychologic factors were captured before and 6 months after surgery. Analyses included univariate statistics, relative risks (RRs) and 95% confidence intervals (95% CIs), and modified Poisson regression for binary data. Results Pain and pain interference 6 months after surgery was reported by 14% (n = 60/433) and 12% (n = 54/433), respectively. Chronic postsurgical pain was reported by 23% (n = 39/172) with preoperative pelvic pain, 17% (n = 9/54) with preoperative remote pain, and 5.1% (n = 10/197) with no preoperative pain. Preoperative state anxiety (RR = 1.8; 95% CI, 1.1–2.8), preoperative pain (pelvic RR = 3.7; 95% CI, 1.9–7.2; remote RR = 3.0; 95% CI, 1.3–6.9), and moderate/severe in-hospital pain (RR = 3.0; 95% CI, 1.0–9.4) independently predicted chronic postsurgical pain. The same 3 factors predicted pain-interference at 6 months. Participants describing preoperative pelvic pain as “miserable” and “shooting” were 2.8 (range, 1.3–6.4) and 2.1 (range, 1.1–4.0) times more likely to report chronic postsurgical pain, respectively. Women taking preoperative opioids were 2.0 (range, 1.2–3.3) times more likely to report chronic postsurgical pain than those not taking opioids. Women with preoperative pelvic pain who took preoperative opioids were 30% (RR = 1.3; 95% CI, 0.8–1.9) more likely to report chronic postsurgical pain than those with preoperative pelvic pain not taking opioids. Conclusions Preoperative pain, state anxiety, pain quality descriptors, opioid consumption, and early postoperative pain may be important predictors of chronic postsurgical pain, which require further investigation.


Prenatal Diagnosis | 1996

The sonographic finding of persistent umbilical cord cystic masses is associated with lethal aneuploidy and/or congenital anomalies.

Graeme N. Smith; Mark Walker; Shawna Johnston; Karen Ash

Advancements in sonographic technology have led to improved prenatal detection of fetal anomalies. Umbilical cord cystic masses are being detected prenatally and several case reports have appeared in the literature. We report three new cases in which umbilical cord cystic masses were detected prenatally; two cases in the later half of pregnancy and one case in the first trimester. The literature was reviewed and summaries of the 23 reported cases of persistent second‐ and third‐trimester umbilical cord cystic masses and their implications are discussed. There is a high association (18 of 23 cases) with lethal chromosomal anomalies and/or congenital malformations suggesting that the finding of an isolated umbilical cord cystic mass should lead to further detailed sonographic evaluation.


Journal of obstetrics and gynaecology Canada | 2006

Canadian Consensus Conference on Menopause, 2006 Update

Serge Belisle; Jennifer Blake; Rosemary Basson; Sophie Desindes; Gillian R. Graves; Sophie Grigoriadis; Shawna Johnston; André E. Lalonde; Christina Mills; Lynn Nash; Robert L. Reid; Timothy Rowe; Vyta Senikas; Michele Turek; Elke Henneberg; Martin Pothier; Chantal Capistran; Jackie Oman

OBJECTIVE To provide guidelines for health care providers on the management of menopause in asymptomatic healthy women as well as in women presenting with vasomotor symptoms, urogenital, sexual, and mood and memory concerns and on specific medical considerations, and cardiovascular and cancer issues. OUTCOMES Prescription medications, complementary and alternative medicine (CAM), and lifestyle interventions are presented according to their efficacy in treating menopausal symptoms. EVIDENCE MEDLINE and the Cochrane database were searched for articles from March 2001 to April 2005 in English on subjects related to menopause, menopausal symptoms, urogenital and sexual health, mood and memory, hormone therapy, CAM, and on specific medical considerations that affect the decision of which intervention to choose. VALUES The quality of evidence is rated using the criteria described in the report of the Canadian Task Force on the Periodic Health Examination. Recommendations for practice are ranked according to the method described in this report (see Table 1). SPONSORS The development of this consensus guideline was supported by unrestricted educational grants from Berlex Canada Inc, Lilly Canada, Merck Frosst, Novartis, Novogen, Novo Nordisk, Proctor and Gamble, Schering Canada, and Wyeth Canada.


Journal of obstetrics and gynaecology Canada | 2005

A Review of the Epidemiology and Pathophysiology of Pelvic Floor Dysfunction: Do Racial Differences Matter?

Shunaha Kim; Marie-Andrée Harvey; Shawna Johnston

OBJECTIVE To describe the current state of knowledge regarding etiology of pelvic floor dysfunction with special consideration to the effect of racial background on the epidemiology and pathophysiology of this disease. METHODS We performed a nonsystematic review of the literature to detail the current knowledge of the etiology of pelvic floor dysfunction. Additionally, we performed a systematic search of MEDLINE, Cinahl, and the Cochrane database for English-language articles registered from January 1, 1989, to June 31, 2003, that evaluated racial differences in the epidemiology and pathophysiology of pelvic floor dysfunction. We also reviewed the references of identified articles. RESULTS We identified 11 articles that examined the effect of racial background on stress urinary incontinence (SUI), urodynamic stress incontinence, and (or) pelvic organ prolapse. We identified 2 studies that measured the prevalence of subjective stress urinary incontinence. Six cross-sectional studies compared the prevalence of urodynamically confirmed SUI and (or) pelvic organ prolapse among different groups. White women had a higher risk of developing urodynamic stress incontinence. Three studies noted anatomical and physiological differences among the different groups. CONCLUSIONS Both quantitative and qualitative defects in collagen (endopelvic fascia) and compromised levator ani muscle function have been identified as important etiologic factors in the development of pelvic floor dysfunction. Parity, vaginal delivery, menopause, and aging have been most clearly associated with collagen defects and levator ani muscle dysfunction. The literature suggests that white women are at increased risk for SUI. At present, there is insufficient evidence to draw any conclusions regarding the role of racial differences in pelvic organ prolapse. It is possible that differences in prevalence rates for both SUI and pelvic organ prolapse may be attributed to inherent anatomical and physiological differences among racial groups.


Journal of obstetrics and gynaecology Canada | 2014

Osteoporosis in Menopause

Aliya Khan; Michel A. Fortier; Robert L. Reid; Beth L. Abramson; Jennifer Blake; Sophie Desindes; Sylvie Dodin; Lisa Graves; Bing Guthrie; Shawna Johnston; Timothy Rowe; Namrita Sodhi; Penny Wilks; Wendy Wolfman

OBJECTIVE To provide guidelines for the health care provider on the prevention, diagnosis, and clinical management of postmenopausal osteoporosis. OUTCOMES Strategies for identifying and evaluating high-risk individuals, the use of bone mineral density (BMD) and bone turnover markers in assessing diagnosis and response to management, and recommendations regarding nutrition, physical activity, and the selection of pharmacologic therapy to prevent and manage osteoporosis. EVIDENCE Published literature was retrieved through searches of PubMed and The Cochrane Library on August 30 and September 18, 2012, respectively. The strategy included the use of appropriate controlled vocabulary (e.g., oteoporosis, bone density, menopause) and key words (e.g., bone health, bone loss, BMD). Results were restricted to systematic reviews, practice guidelines, randomized and controlled clinical trials, and observational studies published in English or French. The search was limited to the publication years 2009 and following, and updates were incorporated into the guideline to March 2013. Grey (unpublished) literature was identified through searching the websites of health technology assessment and health technology assessment-related agencies, clinical practice guideline collections, clinical trial registries, and national and international medical specialty societies.


Journal of obstetrics and gynaecology Canada | 2011

Does Health-Related Quality of Life Improve in Women Following Gynaecological Surgery?

Michelle L. Reitsma; Elizabeth G. VanDenKerkhof; Shawna Johnston; Wilma M. Hopman

OBJECTIVES To measure the change in health-related quality of life (HRQOL) before and after gynaecologic surgery and to compare HRQOL to age-matched Canadian normative data. METHODS This prospective observational cohort study consisted of a convenience sample of 460 women scheduled for elective gynaecologic surgery. Women underwent surgery for a variety of reasons, including cancer, menorrhagia/dysfunctional uterine bleeding, benign uterine masses, prolapse or urinary incontinence, and chronic pelvic pain syndromes. Women were recruited preoperatively and followed for six months after surgery. HRQOL questionnaires were completed preoperatively and at six weeks and six months postoperatively, using the SF-36, and compared between time points and against normative data. Analysis included univariate statistics, repeated measures ANOVA, paired t tests, and independent samples t tests. RESULTS The mean age of women in the study cohort was 49 years (± 11); the majority were married, employed, had an education beyond high school, were overweight or obese, had a hysterectomy, and had an abdominal incision. Twenty-eight percent underwent surgery for cancer. General and mental health domains showed significant improvement between the preoperative and six-week postoperative assessments, while the remaining domains showed statistically significant declines. All but one (general health) of 10 outcomes saw significant improvements from the preoperative to the six-month follow-up assessment. Preoperatively, the surgical sample scored worse on all but one (role emotional) outcome than the normative data. By six months, domain scores were much closer to normative values. CONCLUSION Health-related quality of life improved considerably from the preoperative period to six months postoperative in women who underwent gynaecologic surgery. When compared with normative data from age-matched women, the surgical sample reported significantly reduced HRQOL preoperatively and at six weeks following surgery, but by six months after surgery HRQOL had rebounded to the point of being comparable to age-matched peers.


Acta Obstetricia et Gynecologica Scandinavica | 2008

Mid-trimester serum relaxin concentrations and post-partum pelvic floor dysfunction.

Marie-Andrée Harvey; Shawna Johnston; Gregory Davies

Objectives. To compare mid‐trimester serum relaxin concentration (SRC) in primiparous women with or without pelvic floor dysfunction (PFD – stress urinary incontinence (SUI), genital prolapse). Design. Nested observational cohort study. Setting. Urogynecology clinic of affiliated University hospital. Population. Primiparous women one to four years post‐partum, who had, at time of index pregnancy, participated in a prospective observational study looking at mid‐trimester serum relaxin and preterm delivery. Methods. Relaxin had been obtained during the index pregnancy at 24 and 28 weeks. Primiparous women who had not given birth to a subsequent child were contacted and asked to return for a single visit assessing pelvic floor function. Main outcome measures. Pelvic Organ Prolapse Quantification system (POPQ) and Urogenital Distress Inventory (UDI‐6). Results. Fifty women participated, of whom 40 delivered vaginally. Seventeen (34%) women had prolapse and 23 (46%) had stress incontinence. Relaxin was slightly higher (not significantly) in women with PFD than in those without. Relaxin concentration declined significantly more rapidly from 24 to 28 weeks in incontinent women, after adjusting for baseline and obstetrical factors. Conclusions. In contrast to previous reports, mid‐gestation relaxin tended to be higher and fall significantly faster in women with PFD. Acknowledging relaxins effects on collagen turnover, our findings explore the association between childbirth and PFD.


Journal of obstetrics and gynaecology Canada | 2014

SOGC CLINICAL PRACTICE GUIDELINEManaging Menopause

Robert L. Reid; Beth L. Abramson; Jennifer Blake; Sophie Desindes; Sylvie Dodin; Shawna Johnston; Timothy Rowe; Namrita Sodhi; Penny Wilks; Wendy Wolfman

OBJECTIVE To provide updated guidelines for health care providers on the management of menopause in asymptomatic healthy women as well as in women presenting with vasomotor or urogenital symptoms and on considerations related to cardiovascular disease, breast cancer, urogynaecology, and sexuality. OUTCOMES Lifestyle interventions, prescription medications, and complementary and alternative therapies are presented according to their efficacy in the treatment of menopausal symptoms. Counselling and therapeutic strategies for sexuality concerns in the peri- and postmenopausal years are reviewed. Approaches to the identification and evaluation of women at high risk of osteoporosis, along with options for prevention and treatment, are presented in the companion osteoporosis guideline. EVIDENCE Published literature was retrieved through searches of PubMed and The Cochrane Library in August and September 2012 with the use of appropriate controlled vocabulary (e.g., hormone therapy, menopause, cardiovascular diseases, and sexual function) and key words (e.g., hormone therapy, perimenopause, heart disease, and sexuality). Results were restricted to clinical practice guidelines, systematic reviews, randomized control trials/controlled clinical trials, and observational studies. Results were limited to publication dates of 2009 onwards and to material in English or French. Searches were updated on a regular basis and incorporated in the guideline until January 5, 2013. Grey (unpublished) literature was identified through searching the websites of health technology assessment and health technology assessment-related agencies, national and international medical specialty societies, and clinical practice guideline collections.


Journal of obstetrics and gynaecology Canada | 2009

Confirmation of Ureteric Patency During Cystoscopy Using Phenazopyridine HCl: A Low-cost Approach

Jane Yuet Ching Hui; Marie-Andrée Harvey; Shawna Johnston

OBJECTIVE To describe the use of oral phenazopyridine (Pyridium) prior to pelvic surgery to facilitate intraoperative confirmation of ureteric patency. MATERIALS AND METHODS We performed a chart review of women given phenazopyridine preoperatively prior to pelvic surgery in a tertiary care centre between July 2004 and June 2005. The primary outcome was the cystoscopic observation of bilateral ureteric urine efflux. Secondary outcomes included the visualization of bladder mucosa during cystoscopy, postoperative complications, and urinary tract injury diagnosed postoperatively (i.e., missed intraoperatively). RESULTS Pelvic reconstructive surgery requiring intraoperative cystoscopy was performed in 124 women. Bilateral ureteric patency and bladder mucosal integrity was confirmed in all cases. Phenazopyridine was well tolerated by all patients, and its use was unequivocally documented in 32 subjects whose chart was reviewed to determine postoperative course. Bladder mucosal appearance was unaltered. Dye continued to be excreted during prolonged procedures. Postoperatively, no ureteric injuries were subsequently diagnosed in any patients. The cost per patient of phenazopyridine (


Journal SOGC | 2001

Interstitial Cystitis: Diagnosis and Treatment

Shawna Johnston; Thomas Mainprize

0.29) is substantially lower than indigo carmine (

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Timothy Rowe

University of British Columbia

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