Journal Articles
Published Research
The following is a summary of journal publications by Associate Professor Knowles. Click on the references below for further details.
Journal Articles
2016
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Knowles, S.R., & Skues, J. (2016). Development and Validation of the Shy Bladder and Bowel Scale (SBBS). Cognitive Behaviour Therapy, 45(4), 324-338. doi: 10.1080/16506073.2016.1178800 Impact factor: 2.402
Currently research exploring paruresis and parcopresis, anxiety relating to urinating and having bowel motions in public respectively is limited. While there are several validated measures of paruresis, no valid measure assessing parcopresis is currently available. The present study investigates the development and validation of the Shy Bladder and Bowel Scale (SBBS) which assesses both paruresis and parcopresis. Two participant groups were utilised to validate this scale, a student psychology cohort (n = 387) and a public cohort (n = 334). An eight-item two-factor model was identified in the psychology cohort and confirmed in the public cohort. The two-factor SBBS was found to be a valid and reliable measure of paruresis and parcopresis. Paruresis and parcopresis-related concerns were associated with social anxiety in both cohorts. Subscales for both paruresis and parcopresis (i.e. difficulty, interference and distress) were positively correlated, suggesting individuals are likely to report similar levels of concerns across both conditions. Further, individuals self-identifying with either paruresis or parcopresis reported significantly higher scores on the respective SBBS subscales than non-identifying paruresis and parcopresis individuals. The SBBS also demonstrated strong test-retest reliability in a small sample of adults (n = 13). Overall, the developed scale provides clinicians and researchers with a valuable tool to evaluate both paruresis and parcopresis.
URL: https://www.ncbi.nlm.nih.gov/pubmed/?term=27216857
Knowles, S.R., Ski, C.F., Thompson, D. R., Lautenschlager, N. T., Gonzalez, G., Hsueh, Y., Moore, G., O’Brien, C., & Castle, D. (2016). Can collaborative therapy improve the health? patients undergoing dialysis? A randomized controlled trial, Trials. 17(1), 447.
Background: Chronic kidney disease (CKD) and end-stage kidney disease (ESKD) are serious and growing health problems with enormous impact on psychological and social functioning. Despite high rates of comorbid depression and anxiety in these patient populations, and the adverse impact these have upon treatment adherence, quality of life, social connectedness and healthcare costs there has been little attention focused on the prevention or management of these problems. Thus, our aim was to evaluate the Dialysis Optimal Health Program (DOHP) that adopts a person-centred approach and engages collaborative therapy to educate and support those diagnosed with ESKD who are commencing dialysis.
Methods: The study design is a randomised controlled trial. Ninety-six adult patients initiating haemodialysis or peritoneal dialysis will be randomly allocated to either the intervention (DOHP) or usual care group. Participants receiving the intervention will receive nine (8 + 1 booster session) sequential sessions based on a structured information/workbook, psychosocial and educational supports and skills building. The primary outcome measures are depression and anxiety (assessed by the Hospital Anxiety and Depression Scale; HADS). Secondary outcomes include health-related quality of life (assessed by the Kidney Disease Quality of Life instrument; KDQOL), self-efficacy (assessed by General Self-Efficacy Scale) and clinical indices (e.g. albumin and haemoglobin levels). Cost-effectiveness analysis and process evaluation will also be performed to assess the economic value and efficacy of the DOHP. Primary and secondary measures will be collected at baseline and at 3-, 6-, and 12-month follow-up time points.
Discussion: We believe that this innovative trial will enhance knowledge of interventions aimed at supporting patients in the process of starting dialysis, and will broaden the focus from physical symptoms to include psychosocial factors such as depression, anxiety, self-efficacy, wellbeing and community support. The outcomes associated with this study are significant in terms of enhancing an at-risk population’s psychosocial health and reducing treatment-related costs and associated pressures on the healthcare system.
Trial registration: ANZCTR no. 12615000810516. Registered on 5 August 2015.
URL: https://trialsjournal.biomedcentral.com/articles/10.1186/s13063-016-1558-z
O'Brien, C., Ski, C., Thompson, D., Moore, G., Mancuso, S., Jenkins, A., Ward, G., MacIsaac, R., Loh, M., Knowles, S., Rossell, S., &Castle, D. (2016). The Mental Health in Diabetes Service (MINDS) to enhance psychosocial health: study protocol for a randomized controlled trial. Trials, 17(1), 444.
Background: After a diagnosis of diabetes mellitus, people not only have to cope with the physical aspects and common complications that require daily self-management, they are also faced with ongoing psychosocial challenges. Subsequently they find themselves having to navigate the health system to engage multidisciplinary supports; the combination of these factors often resulting in reduced health-related quality of life. To maintain optimal diabetes control, interventions need to incorporate psychosocial supports and a skill base for disease management. Therefore, our aim was to evaluate an ‘Optimal Health Program’ that adopts a person-centred approach and engages collaborative therapy to educate and support the psychosocial health of people diagnosed with type I or II diabetes.
Methods: This prospective randomised controlled trial will include 166 people diagnosed with diabetes: 83 in the intervention (Optimal Health Program) and 83 in the control (usual care) group. Participants with type diabetes mellitus will be recruited through hospital outpatient clinics and diabetes community organisations. Participants in the intervention group will receive nine (8 + 1 booster session) sequential sessions, based on a structured treatment manual emphasising educational and psychosocial support self-efficacy and skills building. The primary outcome measures will be generalised self-efficacy (GSE) and health-related quality of life (AQoL-6D and EQ-5D). Secondary measures will be anxiety and depression (HADS), social and workplace functioning (WSAS), diabetes-related quality of life (DQoL), diabetes-related distress (PAID), and type of coping strategies (Brief COPE). In addition, a health economic cost analysis and process evaluations will be performed to assess the economic cost and efficacy of the program’s operations, implementation and service delivery.
Discussion: We envisage that the Optimal Health Program’s emphasis on self-efficacy and self-management will provide participants with the skills and knowledge to achieve increased empowerment and independence in aspects of health, which in turn, will help participants deal more effectively with the physical and psychosocial complexities of diabetes.
TRIAL REGISTRATION: ACTRN12614001085662. Registered on 10 October 2014.
URL: https://www.ncbi.nlm.nih.gov/pubmed/?term=27612943
O'Brien, C., Ski, C., Thompson, Moore, G., Gonzales, G., Ya- Hsueh, Y., Knowles, S., Rossell, S., Haselden, R & Castle, D. (2016). The Stroke and Carer Optimal Health Program (SCOHP) to enhance psychosocial health: study protocol for a randomized controlled trial. Trials, 17(1), 446.
Background: Stroke is a leading cause of disability and distress, and often profoundly affects the quality of life of stroke survivors and their carers. With the support of carers, many stroke survivors are returning to live in the community despite the presence of disability and ongoing challenges. The sudden and catastrophic changes caused by stroke affects the mental, emotional and social health of both stroke survivors and carers. The aim of this study is to evaluate a Stroke and Carer Optimal Health Program (SCOHP) that adopts a person-centred approach and engages collaborative therapy to educate, support and improve the psychosocial health of stroke survivors and their carers.
Methods: This study is a prospective randomised controlled trial. It will include a total of 168 stroke survivors and carers randomly allocated into an intervention group (SCOHP) or a control group (usual care). Participants randomised to the intervention group will receive nine (8 + 1 booster) sessions guided by a structured workbook. The primary outcome measures for stroke survivors and carers will be health-related quality of life (AQoL-6D and EQ-5D) and self-efficacy (GSE). Secondary outcome measures will include: anxiety and depression (HADS); coping (Brief COPE); work and social adjustment (WSAS); carer strain (MCSI); carer satisfaction (CASI); and treatment evaluation (TEI-SF and CEQ). Process evaluation and a health economic cost analysis will also be conducted.
Discussion: We believe that this is an innovative intervention that engages the stroke survivor and carer and will be significant in improving the psychosocial health, increasing independence and reducing treatment-related costs in this vulnerable patient-carer dyad. In addition, we expect that the intervention will assist carers and stroke survivors to negotiate the complexity of health services across the trajectory of care and provide practical skills to improve self-management.
Trial registration: ACTRN12615001046594. Registered on 7 October 2015.
URL: https://trialsjournal.biomedcentral.com/articles/10.1186/s13063-016-1559-y
Knowles, S.R., Andrews, J., & Porter, A. Crohn’s & Colitis Australia, IBD Support Australia and the Australian Inflammatory Bowel Disease Association (in press; accepted 20/02/2016). Predictors of impaired mental health and support seeking in adults with inflammatory bowel disease: An online survey. Gastroenterology Nursing. 41(2) (Mar/Apr) of 2018.
Objective: This study explored the possible factors associated with psychological distress in adults with Inflammatory Bowel Disease (IBD) and also engagement in mental health services (MHS) in those reporting distress in a large Australian cohort.
Methods: Participants with IBD completed an online survey assessing perceived IBD activity (Manitoba Index; MI), mental health status (K10), demographic details and engagement with MHS for IBD-associated issues.
Results: Of 336 participants, 76.5% perceived themselves as having active disease over the past 6 months, and on K10 scores, 51.8% had a mental health issue. Of participants with a mental health issue, only 21.3% were currently receiving mental health support. A stepwise logistic regression analysis correctly classified 78.7% of the status of receiving mental health support, with lower income (<$60,000p.a.) the only significant predictor. Paradoxically, the degree of psychological distress did not correlate with seeking mental health support.
Conclusions: The data show that in individuals with ongoing symptoms attributed to active IBD, mental health issues are highly prevalent, with older age and higher income being additional drivers of mental health issues. The greater challenge however, seems not to be identifying mental health issues, but in getting those in need to engage in MHS.
URL: TBA
Jackson, B.D., Gray, K., Knowles, S.R., & De Cruz, P. (2016). eHealth Technologies in Inflammatory Bowel Disease: A Systematic Review. Journal of Crohn’s and Colitis, 10(9), 1103-1121. http://dx.doi.org/10.1093/ecco-jcc/jjw059
Background and Aims: Electronic-health technologies (eHealth) such as Web-based interventions, virtual clinics, smart-phone applications, and telemedicine are being used to manage patients with inflammatory bowel disease (IBD). We aimed to: (1) Evaluate the impact of eHealth technologies on conventional clinical indices and patient-reported outcome measures (PROs) in IBD; (2) assess the effectiveness, cost-effectiveness and feasibility of using eHealth technologies to facilitate the self-management of individuals with IBD, and; (3) provide recommendations for their design and optimal use for patient care.
Methods: Relevant publications were identified via a literature search, and 17 publications were selected based on predefined quality parameters.
Results: Six randomized controlled trials and nine observational studies utilizing eHealth technologies in IBD were identified. Compared with standard outpatient-led care, eHealth technologies have led to improvements in: Relapse duration [( n = 1) 18 days vs 77 days, p < 0.001]; disease activity ( n = 2); short-term medication adherence ( n = 3); quality of life ( n = 4); IBD knowledge ( n = 2); healthcare costs ( n = 4); the number of acute visits to the outpatient clinic due to IBD symptoms ( n = 1), and; facilitating the remote management of up to 20% of an IBD cohort ( n = 2). Methodological shortcomings of eHealth studies include heterogeneity of outcome measures, lack of clinician/patient input, lack of validation against conventional clinical indices and PROs, and limited cost–benefit analyses.
Conclusions: EHealth technologies have the potential for promoting self-management and reducing the impact of the growing burden of IBD on health care resource utilization. A theoretical framework should be applied to the development, implementation, and evaluation of eHealth interventions.
URL: https://academic.oup.com/ecco-jcc/article/10/9/1103/2605214
Knowles SR, Nelson EA, Castle DJ, Salzberg MR, Choong PFM, Dowsey. (2016). Using the common sense model of illness to examine interrelationships between symptom severity and health outcomes in end-stage osteoarthritis patients. Rheumatology, 55(6), 1066-1073, https://doi.org/10.1093/rheumatology/kew022 .
Objective: The aim was to evaluate the utility of the common sense model (CSM) in characterizing contributors to psychological well-being and quality of life (QoL) in patients with end-stage OA.
Methods: One hundred and twenty patients [34 males, 86 females; mean (s.d.) age 65.52 (9.14) years] with end-stage OA (57.5% hip, 42.5% knee) were recruited. OA symptom severity was evaluated according to the WOMAC; coping styles were assessed with the Carver Brief COPE scale; illness perceptions were explored with the Brief Illness Perceptions Questionnaire; self-efficacy was assessed with the Arthritis Self-efficacy scale; anxiety, depression and overall distress were measured using the Hospital Anxiety and Depression Scale; and QoL was assessed using the WHO Quality of Life-short version. The CSM was used to explore the interrelationships between OA symptom severity, illness perceptions and coping strategies in patients.
Results: Two structural equation models were developed, with both found to have good fit. Consistent with the CSM, the standard model indicated that self-reported OA symptom severity directly influenced illness perceptions, which in turn had direct impacts upon maladaptive coping, distress and QoL. The addition of self-efficacy to the CSM resulted in a complex interaction, with OA severity directly influencing self-efficacy and self-efficacy influencing maladaptive coping, distress and QoL.
Conclusion: We found interrelationships amongst OA activity, illness perceptions, coping strategies, self-efficacy, psychological distress and QoL broadly consistent with the CSM. The CSM may help inform the approach to the psychological support that patients with end-stage OA often require.
URL: https://www.ncbi.nlm.nih.gov/pubmed/?term=26961745
Knowles, S.R., Castle, D., Biscan, S., Salzberg, S., O'Flaherty, E., & Langham, R. (2016). Relations between health status, illness perceptions, coping and psychological morbidity in kidney transplants patients. American Journal of the Medical Sciences. 351(3):233–238.
Background: The aim of this study was to explore the effect of kidney transplantation (KT) on psychological distress and quality of life (QoL) in patients with end-stage kidney disease using the Common Sense Model of illness adjustment.
Materials and Methods: A total of 52 individuals (35 men and 17 women) with an average age of 53.54 years from a large metropolitan nephrology outpatient clinic participated.
Results: Poorer health status, illness perceptions and increased engagement in maladaptive coping were associated with psychological distress (specifically anxiety and depression) and poorer QoL. Hierarchical regression, after correcting for KT characteristics (years since most recent KT, number of transplants) indicated that poorer illness status and illness perception predicted QoL. After controlling for KT characteristics, poorer illness status and greater engagement in maladaptive coping predicted depression. In contrast, poorer illness perceptions and greater engagement in maladaptive coping predicted anxiety. Adaptive problem-focused and emotion-focused coping styles were not found to predict anxiety, depression or QoL.
Conclusions: The finding of the present study emphasize on the importance of exploring and understanding the effect of illness status, illness perceptions and coping patterns in patients who have underwent KT.
URL: http://www.amjmedsci.com/article/S0002-9629(15)00065-8/fulltext
Mikocka-Walus, A., Knowles, S.R., Keefer, L., Graff, L. (2016). Controversies revisited: A systematic review of the co-morbidity of depression and anxiety with inflammatory bowel diseases. Inflammatory Bowel Diseases, 22 (3), 752 - 762.
Background: Although mental health concerns are known to occur commonly for those with inflammatory bowel diseases (IBD), the nature of this comorbid relationship has not been systematically reviewed to date. A review in 2007 identified 5 controversies regarding anxiety/depression rates and various comparators between and within IBD. We aimed to systematically analyze and critique the current evidence regarding this comorbidity, providing an update to the 5 controversies.
Methods: Ebscohost Medline, CINAHL, Embase, and PsychINFO were searched between 2005 and 2014 using systematic review methodology. Controlled quantitative studies examining either symptoms or diagnoses of anxiety and depression in IBD were included in the review, with study quality assessed using a scale developed a priori to evaluate observational research.
Results: (1) IBD versus healthy controls (pooled mean proportions) (n = 13 studies): anxiety 19.1% versus 9.6%, depression 21.2% versus 13.4%; (2) IBD inactive versus IBD active disease (n = 26): anxiety 28.2% versus 66.4%, depression 19.9% versus 34.7%; (3) ulcerative colitis versus Crohn’s disease (n = 28): anxiety 31% versus 37%, depression 22% versus 24.4%; (4) IBD versus other chronic medical conditions (n = 17): anxiety 41.9% versus 48.2%, depression 14.5% versus 28.4%; (5) onset of anxiety/depression before or after IBD onset (n = 2): adults more likely to develop anxiety/depression before IBD onset, but a substantial proportion develops depression after onset; an increased risk for children of developing anxiety/depression after IBD onset.
Conclusions: The high rates of anxiety and depression for those with IBD, particularly when disease is active, warrant a systemic approach to screening and treatment.
URL: https://www.ncbi.nlm.nih.gov/pubmed/?term=26841224
Neilson, K., Ftanou, M., Monshat, K., Salzberg, M., Bell, S., Kamm, MA., Connell, W., Knowles, S.R., Sevar, K., Mancuso, S.G., and Castle, D. (2015). A controlled study of a group mindfulness intervention for individuals living with inflammatory bowel disease. Inflammatory Bowel Diseases, 22(3): 694 – 701.
Background: This study aimed to evaluate the feasibility, acceptability, and effectiveness of a mindfulness-based intervention for patients with inflammatory bowel disease (MI-IBD).
Design: Treatment-as-usual control versus mindfulness-based stress reduction intervention.
Methods: Sixty patients participated in either the MI-IBD (n = 33) or treatment-as-usual group (n = 27) conditions. The MI-IBD consisted of an 8-week mindfulness-based stress reduction training group. Outcome measures were administered at baseline (before intervention), immediately after intervention, and 6 months after intervention. Primary outcomes included measures of quality of life, psychological distress (depression and anxiety), and mindfulness. Data for MI-IBD group participants also included weekly attendance, daily minutes meditated, and satisfaction with the program.
Results: There were no baseline differences between intervention and control groups on demographic variables or inflammatory bowel disease severity. Compared with the control group, the MI-IBD group reported significantly greater improvements in anxiety, quality of life, and mindfulness at after intervention, with reduction in depression and improvements in quality of life and mindfulness maintained at 6 months after intervention.
Conclusions: Results demonstrate the feasibility, acceptability, and efficacy of a mindfulness intervention for patients with inflammatory bowel disease, with medium-to-large effects on psychological distress, quality of life, and mindfulness.
URL: https://www.ncbi.nlm.nih.gov/pubmed/?term=26529560
Knowles, S.R., Ski, C.F., Thompson, D. R., Lautenschlager, N.T., Gonzalez, G., Hsueh, Y., Moore, G., O’Brien, C., & Castle, D. (2016). Design and protocol for the Dialysis Optimal Health Program (DOHP) randomised controlled trial. Trials, 17(1), 447. (Impact factor: 1.73; T = 2; GS citations = 2; Scopus = 2; personal contribution 60%)
Abstract:
Background: Chronic kidney disease (CKD) and end-stage kidney disease (ESKD) are serious and growing health problems with enormous impact on psychological and social functioning. Despite high rates of comorbid depression and anxiety in these patient populations, and the adverse impact these have upon treatment adherence, quality of life, social connectedness and healthcare costs there has been little attention focused on the prevention or management of these problems. Thus, our aim was to evaluate the Dialysis Optimal Health Program (DOHP) that adopts a person-centred approach and engages collaborative therapy to educate and support those diagnosed with ESKD who are commencing dialysis.
URL: https://doi.org/10.1186/s13063-016-1558-z