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Parkinson disease primer, part 1: diagnosis

Author/s: 
Frank, C., Chiu, R., Lee, J.

Objective To provide family physicians an updated approach to the diagnosis of Parkinson disease (PD).

Sources of information Published guidelines on the diagnosis and management of PD were reviewed. Database searches were conducted to retrieve relevant research articles published between 2011 and 2021. Evidence levels ranged from I to III.

Main message Diagnosis of PD is predominantly clinical. Family physicians should evaluate patients for specific features of parkinsonism, then determine whether symptoms are attributable to PD. Levodopa trials can be used to help confirm the diagnosis and alleviate motor symptoms of PD. “Red flag” features and absence of response to levodopa may point to other causes of parkinsonism and prompt more urgent referral.

Conclusion Access to neurologists and specialized clinics varies, and Canadian family physicians can be important players in facilitating early and accurate diagnosis of PD. Applying an organized approach to diagnosis and considering motor and nonmotor symptoms can greatly benefit patients with PD. Part 2 in this series will review management of PD.

Parkinson disease (PD) is the fastest growing neurodegenerative condition, with prevalence predicted to double from more than 6 million globally in 2015 to more than 12 million by 2040.1 Recognizing parkinsonism and having knowledge of the presentation, diagnosis, and management of motor and nonmotor symptoms of PD are increasingly important, particularly as access to neurologists and specialized clinics is limited in many parts of Canada.2 Family physicians are well placed to identify symptoms, participate in diagnosis, and collaborate with specialty clinics in management of patients through the course of the disease.

Keywords 
Levodopa Parkinson's Disease diagnosis Parkinson Humans

Individualized antidepressant therapy in patients with major depressive disorder: Novel evidence-informed decision support tool

Author/s: 
Chin, T., Huyghebaert, T., Svrcek, C., Oluboka, O.

Objective: To introduce a visual clinical decision support tool to assist with individualizing first-line antidepressant pharmacotherapy for adults with major depressive disorder (MDD) in a Canadian context.

Sources of information: A literature review was conducted with Google Scholar, PubMed, the Cochrane Database of Systematic Reviews, and Trip Pro using the MeSH headings depression, antidepressive agents, primary care, practice patterns, medication adherence, and decision making, shared.

Main message: Major depressive disorder affects about 4.7% of Canadians annually and is a prevalent condition encountered and diagnosed in primary care. Untreated depression is associated with decreased quality of life, increased risk of suicide, and worsening physical health outcomes when depression co-occurs with other chronic medical conditions. In a network meta-analysis, antidepressant medications (such as selective serotonin reuptake inhibitors, serotonin-norepinephrine reuptake inhibitors, bupropion, and vortioxetine) reduced depressive symptoms by 50% or more when compared with placebo in acute treatment of adults with moderate to severe MDD. Poor treatment adherence and high discontinuation rates limit MDD treatment success. Factors such as strong therapeutic alliances between patients and prescribers, collaborative care, patient education, and supportive self-management have been shown to enhance treatment adherence. The most recent Canadian Network for Mood and Anxiety Treatments depression treatment guidelines (published in 2016) suggest 15 different first-line antidepressant medication options for the treatment of MDD. There is a need for evidence-informed decision support aids to individualize antidepressant therapy to treat patients diagnosed with MDD.

Conclusion: Recent studies on antidepressants have indicated no single antidepressant is superior to others in treating patients with MDD. This suggests there may be opportunities to enhance treatment adherence and success by tailoring antidepressant therapy to align with each patient's preferences. The Antidepressant Decision Support Tool was developed to help prescribers and adult patients engage in shared decision making to select an individualized and optimal first-line antidepressant for the treatment of acute MDD.

Keywords 
Systematic Reviews as Topic antidepressive agents Serotonin Uptake Inhibitors Major Depressive Disorder SSRI

Canadian practice guidelines for the treatment of children and adolescents with eating disorders

Author/s: 
Couturier, J., Isserlin, L., Norris, M., Spettigue, W., Brouwers, M., Kimber, M., McVey, G., Webb, C., Findlay, S., Bhatnagar, N., Snelgrove, N., Ritsma, A., Preskow, W.

Abstract
Objectives: Eating disorders are common and serious conditions affecting up to 4% of the population. The
mortality rate is high. Despite the seriousness and prevalence of eating disorders in children and adolescents, no
Canadian practice guidelines exist to facilitate treatment decisions. This leaves clinicians without any guidance as to
which treatment they should use. Our objective was to produce such a guideline.
Methods: Using systematic review, the Grading of Recommendations Assessment, Development, and Evaluation
(GRADE) system, and the assembly of a panel of diverse stakeholders from across the country, we developed high
quality treatment guidelines that are focused on interventions for children and adolescents with eating disorders.
Results: Strong recommendations were supported specifically in favour of Family-Based Treatment, and more
generally in terms of least intensive treatment environment. Weak recommendations in favour of Multi-Family
Therapy, Cognitive Behavioural Therapy, Adolescent Focused Psychotherapy, adjunctive Yoga and atypical
antipsychotics were confirmed.
Conclusions: Several gaps for future work were identified including enhanced research efforts on new primary and
adjunctive treatments in order to address severe eating disorders and complex co-morbidities.
Keywords: Guidelines, Adolescent, Anorexia nervosa, Bulimia nervosa, Avoidant/restrictive food intake disorder

Keywords 
Anorexia nervosa Avoidant/restrictive food intake disorder Bulimia nervosa guidelines

Preoperative Cardiac Risk Assessment

Author/s: 
Raslau, D, Bierle, DM, Stephenson, CR, Mikhail, MA, Kebede, EB, Mauck, KF

Major adverse cardiac events are common causes of perioperative mortality and major morbidity. Preventing these complications requires thorough preoperative risk assessment and postoperative monitoring of at-risk patients. Major guidelines recommend assessment based on a validated risk calculator that incorporates patient- and procedure-specific factors. American and European guidelines define when stress testing is needed on the basis of functional capacity assessment. Favoring cost-effectiveness, Canadian guidelines instead recommend obtaining brain natriuretic peptide or N-terminal prohormone of brain natriuretic peptide levels to guide postoperative screening for myocardial injury or infarction. When conditions such as acute coronary syndrome, severe pulmonary hypertension, and decompensated heart failure are identified, nonemergent surgery should be postponed until the condition is appropriately managed. There is an evolving role of biomarkers and myocardial injury after noncardiac surgery to enhance risk stratification, but the effect of interventions guided by these strategies is unclear.

Keywords 
cardiac preoperative assessment risk factors heart failure

Canadian guideline for Parkinson disease

Author/s: 
Grimes,D., Fitzpatrick, M., Gordon, J., Miyasaki, J., Fon, E.A., Schlossmacher, M., Suchowersky, O., Rajput, A., Lafontaine, A.L, Mestre, T., Appel-Cresswell, S., Kalia, S., Schoffer, K., Zurowski, M., Postuma, R.B., Udow, S., Fox, S., Barbeau, P., Hutton, B.

KEY POINTS

  • This guideline update reflects substantial changes in the literature on diagnosis and treatment of Parkinson disease, and adds information on palliative care.

  • Impulse control disorders can develop in a person with Parkinson disease who is on any dopaminergic therapy at any stage in the disease course, especially for those taking dopamine agonists.

  • Advanced therapies like deep brain stimulation and intrajejunal levodopa-carbidopa gel infusion are now routinely used in Parkinson disease to manage motor symptoms and fluctuations.

  • Evidence exists to support early institution of exercise at the time of diagnosis of Parkinson disease, in addition to the clear benefit now shown in those with well-established disease.

  • Palliative care requirements of people with Parkinson disease should be considered throughout all phases of the disease, which includes an option of medical assistance in dying.

Diagnosis of Pulmonary Embolism with d-Dimer Adjusted to Clinical Probability

Author/s: 
Kearon, C, de Wit, K, Parpia, S, Schulman, S, Afilalo, M, Hirsch, A, Spencer, FA, Sharma, S, D'Aragon, F, Deshaies, JF, Le Gal, G, Lazo-Langer, A, Wu, C, Rudd-Scott, L, Bates, SM, Julian, JA, PEGeD Study Investigators

BACKGROUND:

Retrospective analyses suggest that pulmonary embolism is ruled out by a d-dimer level of less than 1000 ng per milliliter in patients with a low clinical pretest probability (C-PTP) and by a d-dimer level of less than 500 ng per milliliter in patients with a moderate C-PTP.

METHODS:

We performed a prospective study in which pulmonary embolism was considered to be ruled out without further testing in outpatients with a low C-PTP and a d-dimer level of less than 1000 ng per milliliter or with a moderate C-PTP and a d-dimer level of less than 500 ng per milliliter. All other patients underwent chest imaging (usually computed tomographic pulmonary angiography). If pulmonary embolism was not diagnosed, patients did not receive anticoagulant therapy. All patients were followed for 3 months to detect venous thromboembolism.

RESULTS:

A total of 2017 patients were enrolled and evaluated, of whom 7.4% had pulmonary embolism on initial diagnostic testing. Of the 1325 patients who had a low C-PTP (1285 patients) or moderate C-PTP (40 patients) and a negative d-dimer test (i.e., <1000 or <500 ng per milliliter, respectively), none had venous thromboembolism during follow-up (95% confidence interval [CI], 0.00 to 0.29%). These included 315 patients who had a low C-PTP and a d-dimer level of 500 to 999 ng per milliliter (95% CI, 0.00 to 1.20%). Of all 1863 patients who did not receive a diagnosis of pulmonary embolism initially and did not receive anticoagulant therapy, 1 patient (0.05%; 95% CI, 0.01 to 0.30) had venous thromboembolism. Our diagnostic strategy resulted in the use of chest imaging in 34.3% of patients, whereas a strategy in which pulmonary embolism is considered to be ruled out with a low C-PTP and a d-dimer level of less than 500 ng per milliliter would result in the use of chest imaging in 51.9% (difference, -17.6 percentage points; 95% CI, -19.2 to -15.9).

CONCLUSIONS:

A combination of a low C-PTP and a d-dimer level of less than 1000 ng per milliliter identified a group of patients at low risk for pulmonary embolism during follow-up. (Funded by the Canadian Institutes of Health Research and others; PEGeD ClinicalTrials.gov number, NCT02483442.).

Keywords 
pulmonary embolism PE d-dimer CT computed tomography
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