Officials are investigating a potential environmental health threat in a B.C. elementary school after multiple staff members were diagnosed with breast cancer, Glacier Media has confirmed.
The cases all appear to be contained to a single wing of Alouette Elementary in Maple Ridge, B.C. An undisclosed number of staff in that wing tested positive for breast cancer over the course of two years. The most recent diagnosis coming before this year’s winter break, said a spokesperson for School District 42. The spokesperson said she couldn’t disclose the exact number of cases, citing privacy reasons.
“It’s just weird. They’re all in the same wing of the school. It’s the same four classrooms,” mother Amanda Jackson told Glacier Media.
“My son’s teacher was the latest case, unfortunately. His teacher from last year as well.”
Last year, Jackson said her son and his friends were “constantly sick.” At first, she thought nothing of it — like many kids, she figured they were just passing germs around in a school of more than 400 students. Then COVID-19 restrictions eased, and parents were finally allowed back in the school.
“My nose runs. You just don’t feel well. It’s hard to breathe,” she said. “It’s an old building… I just assumed it was asbestos or mould or something.”
That is, until more and more people started feeling the same way, Jackson said.
Investigation into school contamination continues
After the most recent diagnosis, the school district contacted WorkSafeBC, the BC Centre for Disease Control (BCCDC) and the local medical health officer, according district spokesperson Irena Pochop.
Fraser Health said it is not conducting an environmental investigation at Alouette Elementary, “but we are aware the District is doing testing, and we have been in communication with the school,” wrote health authority spokesperson Nick Eagland in an email.
A spokesperson for WorkSafeBC, meanwhile, told Glacier Media it recently provided “consultative support” to an investigation conducted by the employer, School District 42.
Pochop said the school district has begun environmental testing, looking for friable asbestos and mould, and testing air and water quality. Investigators are also testing the school custodial supplies for contamination.
“We are still awaiting the results of air quality testing, but all results were received and shared with the BCCDC, WorkSafeBC and the medical health officer, who confirmed the testing did not identify any possible sources that could cause breast cancer…” said Pochop in an email.
Those agencies and health officials advised the school district that the next step will involve an assessment from the BC Cancer Agency.
According to the agency, a disease cluster can occur when a group of people share something in common, like their work or where they live. But cancer is a collection of over 100 different diseases. Many have multiple triggers that set of the disease. In other cases, the triggers are unknown.
“That’s why sudden outbreaks of cancer are not seen in the same way they are for infectious diseases,” notes the agency on its website.
“The closest example occurs when groups are exposed to a very potent cancer-causing substance through their occupation, or have a short-term exposure to a strong cancer-causing substance (a carcinogen).”
The agency points to radiation exposure survivors of the atomic bomb explosions in Japan faced after the Second World War. But even in that case, “that cancer cluster emerged after, and over, many years.”
Glacier Media reached out to the BC Cancer Agency on Thursday, Jan. 19 to confirm whether it was conducting an investigation, and if so, what it had learned. A spokesperson for the Provincial Health Services Authority, which speaks to the press on behalf of BC Cancer, said it could not provide a response “until next week at the earliest.”
Pochop said classes have not been suspended in the section of the school that’s under investigation, and the medical health officer has not raised any concerns about student safety.
“While we have been dedicated to following up on staff concerns, we are also mindful of and attempting to respect the right to privacy of the staff members who have been impacted by their diagnosis,” she said.
Asbestos exposures among biggest source of worker deaths in B.C.
While it’s not yet clear what has led to the cluster of cancer cases, workplace exposures at B.C. schools have been known to trigger cancer in the past.
Past studies from WorkSafeBC have identified cases of lung cancer and mesothelioma — a rare form of cancer often brought on by asbestos exposure that usually affects the linings surrounding organs in the chest — in people working in B.C. schools undergoing renovation. Those risks are especially elevated in buildings built before 1990.
Between 2002 and 2021, WorkSafeBC recognized 1,112 worker deaths related to asbestos exposure. Of those, 95 per cent were male and 59 per cent were between 71 and 85 years old.
But according to the American Cancer Society and WorkSafeBC, people exposed to asbestos usually experience a 20- to 30-year latency period before receiving a cancer diagnosis.
In addition to the negative asbestos test results, none of the authorities contacted for this story provided information to suggest the teachers were exposed to an environmental toxin like asbestos over multiple decades.
Built in 1989, Alouette Elementary was expected to receive interior and exterior upgrades in 2022 and is due to to have its building envelope remediated by 2024, according to a 2022 strategic facilities plan.
“The only school remaining in the Central Capital Zone with building envelope remediation requirements is Alouette Elementary,” noted the plan.
There is no evidence, however, that the age and condition of the building have contributed to the cancer diagnoses.
Suspected school cancer clusters not unheard of
In other jurisdictions, suspected school cancer clusters have been blamed on a number of environmental exposures.
In December 2022, investigators from the University of Iowa found it was likely there was no cancer cluster in a local school after 12 teachers were diagnosed with breast cancer over a decade.
At a high school in New Jersey, more than 100 former students and staff were diagnosed with brain cancer and other central nervous system cancers over a 30-year period. One former student who tested positive for cancer told local reporters last year he believed the cases may be linked to a nearby plant at one time used to process, package, store and ship uranium under the Manhattan Project. But an environmental study carried out last year found no traces of radiological contamination, according to a report from NBC in May.
And in 2019, the Pennsylvania Department of Health found that over the course of a decade, four diagnosis of a rare tumour in students and staff members were not “consistently or statistically significantly higher than expected,” reported a local newspaper.
Back in Maple Ridge, Pochop said their investigation will continue under the direction of the medical health officer.
“The health and safety of our students and staff is always our top priority, and we are committed to following any and all direction that we may receive from public health experts,” Pochop said.
Guidance for diagnosing and managing migraine – News-Medical.Net
Migraine is a major cause of disability, affecting about 12% of people. A 2-part series published in CMAJ (Canadian Medical Association Journal) on diagnosing and managing the condition with both acute and preventive therapy provides guidance for clinicians. https://www.cmaj.ca/lookup/doi/10.1503/cmaj.211969.
“The goal of treatment of migraine attacks is to provide rapid relief from pain and other migraine-related symptoms, to restore patient function and to prevent recurrence,” writes Dr. Tommy Chan, Department of Clinical Neurological Sciences, Western University, London, Ontario, with coauthors.
“A stratified approach to treatment that empowers patients to choose from different options, depending on attack symptoms and severity, and encourages them to combine medications from different classes (e.g., nonsteroidal anti-inflammatory drugs and triptans) for severe or prolonged attacks, is preferred.”
Part 2 of the review, which will be published February 6, focuses on preventive treatment to reduce the frequency and severity of migraine attacks.
Tzankova, V., et al. (2023) Diagnosis and acute management of migraine. Canadian Medical Association Journal. doi.org/10.1503/cmaj.211969.
COVID-19 outbreak declared over at Petrolia’s hospital
A COVID-19 outbreak at Petrolia’s hospital has been declared over, Bluewater Health officials said Monday.
Diligent infection prevention and control measures were key in helping control the outbreak, declared Jan. 17, Bluewater Health officials said in a news release.
Hospital officials said the decision to declare the outbreak over was done in consultation with Lambton public health.
Bluewater Health Monday reported seven COVID-positive patients in Sarnia and Petrolia hospitals.
Bluewater Health’s policy allows a maximum of two visitors at the bedside at a time, officials said, noting visitors must wear masks and cannot have food or drink within patient rooms.
Diagnosis and acute management of migraine
See related review article at www.cmaj.ca/lookup/doi/10.1503/cmaj.221607 (to be published February 6, 2023) and a first-person account of the difficulty of finding migraine treatment at www.cmaj.ca/lookup/doi/10.1503/cmaj.221813
Migraine is a leading cause of disability across all age groups.
Routine imaging is not recommended in patients with migraine who have no red flags, atypical symptoms or abnormal findings on neurologic examination.
A stratified approach for acute migraine treatment empowers patients to choose from different treatment options depending on attack symptoms and severity and encourages patients to combine medications from different classes.
Effective acute migraine treatment includes acetaminophen, nonsteroidal anti-inflammatory drugs and triptans.
Ubrogepant and rimegepant are new, effective migraine treatments, suitable for patients with cardiovascular disease in whom triptans are contraindicated.
Migraine affects about 12% of adults, with a prevalence of 18% in women and 6% in men.1–3 Globally, in 2019, migraine was the second leading cause of disability among men and women across all age groups, and the leading cause of disability in women aged 15–49 years (expressed as years lived with disability). 4 In the United States, more than 70% of all migraine-related visits are to primary care providers,5 who play a central role in diagnosing and managing migraine. Recently, several new classes of migraine-specific medications have been shown to be effective and the evidence for the effectiveness of non-pharmacologic interventions is growing. In this article, we discuss the diagnosis and acute management of migraine, based on original research evidence, reviews and clinical practice guidelines (Box 1). We discuss prevention of migraine in a second article.6
Box 1: Evidence used in this review
We conducted a targeted search of Google Scholar and PubMed to identify original research, review articles and clinical practice guidelines published through November of 2021, using search terms that included, but were not limited to, “migraine acute treatment,” “migraine preventive treatment,” “migraine CGRP monoclonal antibodies,” “migraine 5-HT1F,” “migraine behavioural treatments” and “migraine neuromodulation.” We also consulted the most recent guidelines from the Canadian Headache Society and the American Headache Society, and the International Classification of Headache Disorders, 3rd edition.
What is the current understanding of migraine pathophysiology?
Migraine is characterized by neuronal hyperexcitability. Many genetic variants have been associated with increased susceptibility for migraine, suggesting a strong genetic basis.7 Migraine attacks can be broken down into 5 phases: prodrome, aura, headache, postdrome and interictal. However, not every migraine attack progresses through all phases (e.g., only one-third of people with migraine will experience aura) and the phases do not necessarily occur in succession (e.g., aura and headache can occur simultaneously).8,9
The pathophysiology of the headache phase is widely accepted to result from activation of the trigeminovascular pathway, which consists of peripheral trigeminal afferent nerves that innervate the dura and large cerebral arteries. When these neurons are stimulated, they release vasoactive neuropeptides such as calcitonin gene-related peptide (CGRP) and transmit nociceptive signals to the trigeminal nucleus caudalis. Nociceptive signals from the trigeminal nucleus caudalis and the dorsal horn of the upper cervical roots (C1–C2) converge at the trigeminal cervical complex before being relayed to central structures involved in pain processing (brain stem, thalamus, hypothalamus, basal ganglia and cortex).8,9 Levels of CGRP increase during a migraine attack and decrease with treatment and between attacks, and CGRP infusion can trigger a migraine attack.10 Calcitonin gene-related peptide facilitates migraines through various mechanisms, including arterial vasodilation, inflammation in the dura, facilitation of neuronal signalling and modulation of nociceptive signal transmission at the trigeminal cervical complex.10 The hypothesis that migraine can be aborted or prevented by blocking the action of CGRP has been central to the development of drugs that target the CGRP ligand or receptor.11
What are the diagnostic criteria for migraine?
In the third edition of the International Classification of Headache Disorders (ICHD-3), migraine is subclassified into 6 categories: migraine without aura, migraine with aura, chronic migraine, complications of migraine, probable migraine and episodic syndromes that may be associated with migraine.12
Changes from ICHD-2 include modification of migraine with aura so that aura symptoms must meet 3 of 6 aura characteristics (at least 1 aura symptom spreads gradually over 5 min or more, 2 or more aura symptoms occur in succession, each individual aura symptom lasts 5–60 min, at least 1 aura symptom is unilateral, at least 1 aura symptom is positive, the aura is accompanied — or followed within 60 min — by headache), to better distinguish migraine aura from symptoms of transient ischemic attack.13 The diagnosis previously known as basilar artery migraine has been renamed “migraine with brain stem aura,” to reflect the low likelihood that the basilar artery is involved.12 Chronic migraine has been reclassified as a subtype of migraine rather than a complication of migraine, highlighting that it is a distinct entity with unique treatments. Although the diagnostic criteria for chronic migraine still require that headache be present on 15 or more days per month for more than 3 consecutive months, migraine-type headache need be present on only 8 of the headache days each month, in recognition that patients can often experience a mixture of headache phenotypes, including tension-type.12
The Visual Aura Rating Scale (VARS) has been validated for use in distinguishing migraine with visual aura from nonspecific visual symptoms and it has a 91% sensitivity and 96% specificity for diagnosis of visual aura when the score is ≥ 5. The 5 characteristics of the visual symptoms that make up the the scale are duration 6–60 minutes (3 points), develops gradually over 5 minutes or more (2 points), scotoma present (2 points), zigzag line present (2 points) and unilateral (1 point).14
The ID Migraine Screener, a tool that has been validated in primary care, screens for 3 key migraine-associated features: photophobia, functional impairment and nausea (with the mnemonic “PIN the diagnosis”). The screen is positive for migraine if the patient has 2 or more of the features, and a study of 563 patients presenting for routine primary care appointments and reporting headaches in the past 3 months found the sensitivity to be 0.81 (95% confidence interval [CI] 0.77–0.85), specificity to be 0.75 (95% CI 0.64–0.84) and the positive predictive value to be 0.93 (95% CI 0.54–0.82).15
When should imaging be ordered in patients with migraine?
For patients with stable headaches who meet criteria for migraine and have a normal neurologic examination, guidelines from the American College of Radiology and the American Headache Society strongly recommend against routine neuroimaging.16,17 A meta-analysis found that in such patients, the prevalence of important intracranial abnormalities on neuroimaging ranged from 0% to 3.1%, with a combined prevalence of 0.18% (upper 95% CI 0.59%).18 This is comparable to the prevalence of abnormalities detected on neuroimaging among the general population (neoplastic abnormalities 0.7% [95% CI 0.47%–0.98%], nonneoplastic abnormalities 2% [95% CI 1.10%–3.15%]).19 The detection of incidental findings can trigger undue patient anxiety and unnecessary investigations and procedures.16,17
Neuroimaging should be ordered in patients with an abnormal neurologic examination or red flags on history. Headache red flags consist of patient characteristics, features of the headache, and clinical symptoms or signs that should be assessed in every patient presenting with headache. The mnemonic SNOOP4 is a widely used, simple, yet comprehensive way to remember the headache red flags (Table 1).20,21 Neuroimaging should also be ordered in patients with unilateral headache that always occurs on the same side (side-locked), a feature of trigeminal autonomic cephalalgias, which can be mimicked by underlying central nervous system pathologies such as pituitary tumours, intracranial dissections or aneurysms, and infections; aura symptoms that are unusual, prolonged or persistent, a feature that could indicate an underlying lesion or seizure; and post-traumatic headache, because of the increased risk for intracranial hemorrhage or vascular injuries.17
Magnetic resonance imaging (MRI) is preferred over computed tomography (CT) as it provides better visualization of the brain parenchyma and is more sensitive in detecting subtle lesions.22 The use of contrast can further help with visualizing the brain parenchyma and meninges and should be considered when intracranial mass, infection or inflammation are suspected.16 However, CT is preferred when hemorrhages or fractures are suspected and should be performed first when there is concern for an acute abnormality and when MRI is not readily available.22 When headache is accompanied by optic disc edema, CT or MRI with venogram is suggested to rule out cerebral venous sinus thrombosis as a cause of high intracranial pressure.16 In some patients, additional investigations such as lumbar puncture, electroencephalogram and blood work may be indicated, but this is beyond the scope of this review. A comprehensive review of neuroimaging and workup of secondary causes of headache was recently published.23
What is the approach to acute treatment of a migraine attack?
The goal of treatment of migraine attacks is to provide rapid relief from pain and other migraine-related symptoms, to restore patient function and to prevent recurrence. Ideally, treatment should be self-administered, effective, well tolerated and affordable, and require minimal redosing.24 A stratified approach to treatment that empowers patients to choose from different options, depending on attack symptoms and severity, and encourages them to combine medications from different classes (e.g., nonsteroidal anti-inflammatory drugs and triptans) for severe or prolonged attacks, is preferred.25,26 Migraine attacks associated with mild disability can be treated with simple analgesics, with an additional dose of the same or a different agent in the next 2–24 hours, if needed. The Traffic Light of Headache is a tool that can help patients make acute treatment decisions using a stratified treatment plan, according to their level of functional impairment.27 All patients should be educated and screened for medication overuse, which can lead to medication-overuse headache and is a risk factor for transformation of episodic to chronic migraine.25,26
Classic pharmacologic acute treatments for migraine
Guidelines from the Canadian Headache Society and American Headache Society both indicate that acetaminophen, acetylsalicylic acid, diclofenac, ibuprofen, naproxen sodium and triptans have the highest level of evidence for treatment of migraine attacks (Table 2).26,28 Dihydroergotamine, which has been available for decades, can be useful as a first-line agent in some patients (patients with severe attacks or who do not respond well to triptans, or both). However, the Canadian Headache Society recommends against routine use of dihydroergotamine, given potential drug interactions and a high risk of vascular adverse effects, such as bradycardia and prolonged vasoconstriction (coronary, peripheral and central).26 Dihydroergotamine is contraindicated in patients who are pregnant or have a history of peripheral vascular disease, coronary artery disease, uncontrolled hypertension, stroke, sepsis, and renal or hepatic dysfunction.24 The Canadian Headache Society also strongly recommends against the routine use of combination analgesics containing codeine or tramadol, opioids, and butalbital-containing medications, owing to the high risk of sedation, dependence and the development of medication overuse headache.22,26
New pharmacologic acute treatment of migraine
Two classes of orally administered small-molecule drugs have recently been approved by the US Food and Drug Administration for the treatment of migraine attacks with and without aura: ditans (lasmiditan) and gepants (ubrogepant and rimegepant) (Table 3). They can be used in patients with cardiovascular disease in whom triptans are contraindicated.29–31 The gepants are currently being considered by Health Canada, but at the present time, lasmiditan will not be marketed in Canada.
The safety and efficacy of each class of drug has been evaluated in phase 3, randomized, placebo-controlled trials, which assessed acute treatment response during a single migraine attack.29,30,32–35 Study design and inclusion and exclusion criteria were similar across the trials. The co-primary outcomes were freedom from pain at 2 hours and resolution of the most bothersome migraine symptom at 2 hours. Inclusion criteria were a minimum 1-year history of migraine or migraine with aura, onset before age 50 years and 2–8 moderate-to-severe migraine headaches per month. Patients were excluded if they had 15 or more headache days per month, a history of medication overuse or a change in their baseline preventive treatment within the previous 3 months. Although patients with cardiovascular risk factors (e.g., obesity, diabetes, dyslipidemia, smoking) were included in all trials, patients with clinically important cardiovascular disease were excluded from all studies except 1 trial that evaluated lasmiditan.30 This is the most notable limitation of these studies, given that the greatest potential advantage of the ditans and gepants is their suitability for use in patients with clinically important cardiovascular disease in whom triptans are contraindicated.
Trial participants had a mean age between 40 and 42 years, 84.0%–88.0% were women and 75.0%–82.5% were white. All 3 drugs met the co-primary outcomes (freedom from pain at 2 h and resolution of the most bothersome migraine symptom at 2 h) compared with placebo, and treatment-related adverse effects were mild and transient (Table 3).29,30,32–35 The most common adverse effects with the gepants were nausea, dizziness, dry mouth and dyspepsia.32,34 Open-label extension trials have not identified any long-term safety or tolerability concerns for up to 1 year.36,37 Dizziness and sedation were the most common adverse effects seen with lasmiditan, resulting in a label warning patients not to drive within 8 hours of its use (Table 3). Ongoing collection of real-world data is needed to monitor for emergence of additional potential adverse effects with use beyond 1 year.
No head-to-head studies have compared ditans or gepants with triptans. However, a recent systematic review and meta-analysis quantified the effect of lasmiditan, rimegepant and ubrogepant compared with triptans in treatment of migraine attacks.38 In terms of efficacy, triptans (except naratriptan 2.5 mg and almotriptan 6.25 mg) were more strongly associated with freedom from pain at 2 hours than lasmiditan (50 mg, 100 mg), rimegepant 75 mg and ubrogepant (50 mg, 100 mg). Patients treated with rizatriptan, sumatriptan and zolmitriptan had more adverse events than patients treated with rimegepant and ubrogepant.38 Patients treated with lasmiditan had more adverse events than most other treatments (triptans and gepants) at all doses, owing to a high incidence of dizziness and sedation. In summary, most triptans are more efficacious than the new drugs, but with similar or poorer tolerability than gepants. Lasmiditan appears to be associated with the most adverse events.
According to current evidence, triptans should remain the mainstay of acute treatment of migraines, while ditans and gepants can be alternatives for patients who cannot tolerate or do not respond well to triptans, as well as patients with cardiovascular disease in whom triptans are contraindicated. As of May 2021, rimegepant was also approved in the US for prevention for episodic migraine, making it the first oral medication with indications for both acute and preventive treatment, the latter being the subject of a subsequent article.6,33,35,39
What are the device- and procedure-related treatment options for migraine?
Neuromodulation devices and peripheral nerve blocks have a role in the management of a small number of patients with migraine. Evidence to support these is discussed in Appendix 1 (available at www.cmaj.ca/lookup/doi/10.1503/cmaj.211969/tab-related-content). Neuromodulation devices, of which 2 are available in Canada, can be used alone or together with pharmacotherapy for the acute treatment of migraine. They are noninvasive and have minimal adverse effects. Peripheral nerve blockade with local anesthetic injection can be performed at various nerve branches of the trigeminocervical system and it is covered by most provincial public health plans in Canada.
Migraine is a leading cause of disability. Treatment of migraine attacks should aim to provide rapid relief from headache pain and related symptoms, restore patient functioning and prevent recurrence. Older medications remain effective, although newer medications may be preferred for certain groups of patients. In Box 2, we provide a practical clinical approach to management of the patient with migraine. Nonpharmacologic and pharmacologic approaches to the prevention of migraine will be discussed in a separate article.6
Box 2: A clinical approach to managing migraine
Identify that the primary headache type is migraine.
Order brain imaging to exclude secondary causes of headache if red flags or abnormalities on physical examination are present.
Categorize the disorder (episodic v. chronic migraine).
Identify comorbidities and exacerbating factors.
Assess disability and attack characteristics.
Review previous treatments, unmet needs and patient’s treatment goals.
Formulate a treatment plan.
Take a stratified approach to acute migraine treatment.
Individualized drugs: choose the medication best suited for the patient; with oral prevention drugs, start low and go slow.
Consider comorbidities and coverage for migraine prevention (e.g., consider an antidepressant if patient has comorbid psychological symptoms, avoid divalproex acid in people of childbearing age, be aware that calcitonin gene-related peptide monoclonal antibodies (CGRP mAbs) and onabotulinumtoxinA require a trial of at least 2 oral preventatives before they can be covered by public or private funding and that CGRP mAbs are approved for both episodic and chronic migraine, while onabotulinumtoxinA is approved only for chronic migraine).
Competing interests: Werner Becker reports receiving consulting fees from AbbView, Novartis, Lundbeck, Eli Lilly, Teva and McKesson, and honoraria for lectures, presentations, manuscript writing and educational events from AbbVie, Novartis, Weber and Weber, Lundbeck and Teva. Dr. Becker serves as a volunteer member on the board of Migraine Canada and on the board of the Pain Society of Alberta. In the past, he has served on the boards of the Canadian Headache Society and the American Headache Society. Tommy Lik Hang Chan reports receiving unrestricted education grants from AbbVie, Teva and Novartis; honoraria from AbbVie, Eli Lilly, Miravo and Novartis; and travel stipends for attending conferences and meetings from AbbVie. Dr. Chan is on the advisory board for AbbVie, Eli Lilly, Teva, Lundbeck, Miravo and Novartis. No other competing interests were declared.
This article was solicited and has been peer reviewed.
Contributors: All of the authors contributed to the conception and design of the work, drafted the manuscript, revised it critically for important intellectual content, gave final approval of the version to be published and agreed to be accountable for all aspects of the work.
This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY-NC-ND 4.0) licence, which permits use, distribution and reproduction in any medium, provided that the original publication is properly cited, the use is noncommercial (i.e., research or educational use), and no modifications or adaptations are made. See: https://creativecommons.org/licenses/by-nc-nd/4.0/
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