Gregory Peterson

Dr. Gregory Peterson

School of Pharmacy and Pharmacology, University of Tasmania, Bag 26, Hobart, TAS 7001, Australia
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Research Focus & Metrics

Academic Career Length

45Years (1982-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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13 September 2010 in Journal of Clinical Pharmacy and Therapeutics
Verified
Journal Article
Open access
PDF file
TJThomas Jackson
Thomas Jackson
GJG. A. Jacobson
G. A. Jacobson
CNC. K. Narkowicz
C. K. Narkowicz
Gregory PetersonGregory Peterson
Gregory Peterson
HBH. Burnet
H. Burnet
CSC. Sharpe
C. Sharpe
Onychomycosis is a fungal infection of the nail plate or nail bed. It does not usually cure itself and it can trigger more infectious lesions in other parts of the body. The reported prevalence of onychomycosis is increasing in Western countries, presumably due to lifestyle changes and the ageing of the population. Approximately 10% of the general population, 20% of the population aged >60 years, up to 50% of people aged >70 years and up to one‐third of diabetic individuals have onychomycosis. Care should be taken for the accurate diagnosis and timely treatment of toenail onychomycosis to prevent complications. Current treatment options have relatively limited therapeutic success, particularly long‐term. Oral medications are associated with high recurrence rates and treatment failure, and are not suitable for many cases due to potential adverse effects. Topical medications are recommended only for mild to moderate cases. The cost of therapies may also be prohibitive in some cases. In the light of these issues, more research is warranted for the investigation and development of more effective and economical options for the treatment and prophylaxis of toenail onychomycosis. In patient populations such as diabetic individuals, where onychomycosis can provoke lower extremity complications, professional podiatry care of toenails and feet should be encouraged.

1 April 2016 in Medicine
Verified
Journal Article
Open access
WBWoldesellassie M. Bezabhe
Woldesellassie M. Bezabhe
LCLeanne Chalmers
Leanne Chalmers
LBLuke Bereznicki
Luke Bereznicki
Gregory PetersonGregory Peterson
Gregory Peterson
The often cited need to achieve ≥95% (nearly perfect) adherence to antiretroviral therapy (ART) for successful virologic outcomes in HIV may present a barrier to initiation of therapy in the early stages of HIV. This meta-analysis synthesized 43 studies (27,905 participants) performed across >26 countries, to determine the relationship between cut-off point for optimal adherence to ART and virologic outcomes. Meta-analysis was performed using a random-effect model to calculate pooled odds ratios with corresponding 95% confidence intervals. The mean rate of patients reporting optimal adherence was 63.4%. Compared with suboptimal adherence, optimal adherence was associated with a lower risk of virologic failure (0.34; 95% CI: 0.26-0.44). There were no significant differences in the pooled odds ratios among different optimal adherence thresholds (≥98-100%, ≥95%, ≥80-90%). Study design (randomized controlled trial vs observational study) (regression coefficient 0.74, 95% CI: 0.04-1.43, P < 0.05) and study region (developing vs developed countries; regression coefficient 0.56, 95% CI: 0.01-1.12, P < 0.05) remained as independent predictors of between-study heterogeneity, with more patients with optimal adherence from developing countries or randomized controlled trials experiencing virologic failure. The threshold for optimal adherence to achieve better virologic outcomes appears to be wider than the commonly used cut-off point (≥95% adherence). The cut-off point for optimal adherence could be redefined to a slightly lower level to encourage the prescribing ART at an early stage of HIV infection.

14 May 2014 in PLOS ONE
Verified
Journal Article
Open access
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WBWoldesellassie M. Bezabhe
Woldesellassie M. Bezabhe
LCLeanne Chalmers
Leanne Chalmers
LBLuke Bereznicki
Luke Bereznicki
Gregory PetersonGregory Peterson
Gregory Peterson
MBMekides A. Bimirew
Mekides A. Bimirew
DKDesalew M. Kassie
Desalew M. Kassie
Antiretroviral therapy (ART) has been life saving for hundreds of thousands of Ethiopians. With increased availability of ART in recent years, achievement of optimal adherence and patient retention are becoming the greatest challenges in the management of HIV/AIDS in Ethiopia. However, few studies have explored factors influencing medication adherence to ART and retention in follow-up care among adult Ethiopian HIV-positive patients, especially in the Amhara region of the country, where almost one-third of the country’s ART is prescribed. The aim of this qualitative study was to collect such data from patients and healthcare providers in the Amhara region of Ethiopia. Semi-structured interviews were conducted with 24 patients, of whom 11 had been lost to follow-up and were non-persistent with ART. In addition, focus group discussions were performed with 15 ART nurses and 19 case managers. All interviews and focus groups were audio-recorded, transcribed, and coded for themes and patterns in Amharic using a grounded theory approach. The emergent concepts and categories were translated into English. Economic constraints, perceived stigma and discrimination, fasting, holy water, medication side effects, and dissatisfaction with healthcare services were major reasons for patients being non-adherent and lost to follow-up. Disclosure of HIV status, social support, use of reminder aids, responsibility for raising children, improved health on ART, and receiving education and counseling emerged as facilitators of adherence to ART. Improving adherence and retention requires integration of enhanced treatment access with improved job and food security. Healthcare providers need to be supported to better equip patients to cope with the issues associated with ART. Development of social policies and cooperation between various agencies are required to facilitate optimal adherence to ART, patient retention, and improved patient outcomes.

4 December 2015 in PLOS ONE
Verified
Journal Article
Open access
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SGSaurav Ghimire
Saurav Ghimire
RCRonald L. Castelino
Ronald L. Castelino
NLNicole M. Lioufas
Nicole M. Lioufas
Gregory PetersonGregory Peterson
Gregory Peterson
SZSyed Tabish Razi Zaidi
Syed Tabish Razi Zaidi
End-stage kidney disease (ESKD) patients are often prescribed multiple medications. Together with a demanding weekly schedule of dialysis sessions, increased number of medicines and associated regimen complexity pre-dispose them at high risk of medication nonadherence. This review summarizes existing literature on nonadherence and identifies factors associated with nonadherence to medication therapy in patients undergoing haemodialysis. A comprehensive search of PubMed, Embase, CINAHL, PsycInfo, and Cochrane Database of Systematic Reviews covering the period from 1970 through November 2014 was performed following a predefined inclusion and exclusion criteria. Reference lists from relevant materials were reviewed. Data on study characteristics, measures of nonadherence, prevalence rates and factors associated with nonadherence were collected. The Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) guidelines was followed in conducting this systematic review. Of 920 relevant publications, 44 were included. The prevalence of medication nonadherence varied from 12.5% to 98.6%, with widespread heterogeneity in measures and definitions employed. Most common patient-related factors significantly associated with nonadherence were younger age, non-Caucasian ethnicity, illness interfering family life, being a smoker, and living single and being divorced or widowed. Similarly, disease-related factors include longevity of haemodialysis, recurrent hospitalization, depressive symptoms and having concomitant illness like diabetes and hypertension. Medication-related factors such as daily tablet count, total pill burden, number of phosphate binders prescribed and complexity of medication regimen were also associated with poor adherence. A number of patient-, disease-, and medication-related factors are associated with medication nonadherence in haemodialysis patients. Clinicians should be aware of such factors so that adherence to medications can be optimised in haemodialysis patients. Future research should be directed towards well-designed prospective longitudinal studies developing standard definitions and validating available measurement tools, while focusing on the role of additional factors such as psychosocial and behavioural factors in predicting nonadherence to medications.

15 September 2021 in Journal of Clinical Medicine
Verified
Journal Article
Open access
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AMAlicia Martin
Alicia Martin
Mark NauntonMark Naunton
Mark Naunton
Sam KosariSam Kosari
Sam Kosari
Gregory PetersonGregory Peterson
Gregory Peterson
TJThomas Jackson
Thomas Jackson
JCJulia Christenson
Julia Christenson
Background: The aim of this review was to assess the quality of international treatment guidelines for post-traumatic stress disorder (PTSD), and identify differences between guideline recommendations, with a focus on the treatment of nightmares. Methods: Guidelines were identified through electronic searches of MEDLINE, CINAHL, PubMed, Embase and Science Direct, as well as web-based searches of international guideline repositories, websites of psychiatric organisations and targeted web-searches for guidelines from the three most populous English-speaking countries in each continent. Data in relation to recommendations were extracted and the AGREE II criteria were applied to assess for quality. Results: Fourteen guidelines, published between 2004–2020, were identified for inclusion in this review. Only five were less than 5 years old. Three guidelines scored highly across all AGREE II domains, while others varied between domains. Most guidelines consider both psychological and pharmacological therapies as first-line in PTSD. All but one guideline recommended cognitive behavioural therapy (CBT) as first-line psychological treatment, and selective serotonin reuptake inhibitors (SSRIs) as first-line pharmacological treatment. Most guidelines do not mention the targeted treatment of nightmares as a symptom of PTSD. Prazosin is discussed in several guidelines for the treatment of nightmares, but recommendations vary widely. Most PTSD guidelines were deemed to be of good quality; however, many could be considered out of date. Recommendations for core PTSD symptoms do not differ greatly between guidelines. However, despite the availability of targeted treatments for nightmares, most guidelines do not adequately address this. Conclusions: Guidelines need to be kept current to maintain clinical utility. Improvements are most needed in the AGREE II key domains of ‘applicability’, ‘rigour of development’ and ‘stakeholder involvement’. Due to the treatment-resistant nature of nightmares, guideline development groups should consider producing more detailed recommendations for their targeted treatment. More high-quality trials are also required to provide a solid foundation for making these clinical recommendations for the management of nightmares in PTSD.

22 May 2007 in Diabetic Medicine
Verified
Journal Article
Closed access
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IKI. Krass
I. Krass
CAC. L. Armour
C. L. Armour
BMB. Mitchell
B. Mitchell
MBM. Brillant
M. Brillant
RDR. Dienaar
R. Dienaar
Jenny WilkinsonJenny Wilkinson
Jenny Wilkinson