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Abstract available online: https://www.atsjournals.org/doi/abs/10.1164/ajrccm-conference.2023.207.1_MeetingAbstracts.A6470
Source: S. Jothi, G. Claessen, M. Insel, S. Kubba, E. Howden, S.-R. Carmona, F.P. Rischard. Post-acute Sequelae of SARS Co-V2 and Chronic Fatigue/Myalgic Encephalitis Share Similar Pathophysiologic Mechanisms of Exercise Limitation. https://www.atsjournals.org/doi/abs/10.1164/ajrccm-conference.2023.207.1_MeetingAbstracts.A6470
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Background Post-COVID-19 syndrome, also known as long COVID, is a disorder that has many characteristics, one of which is chronic fatigue following acute infection with the SARS-CoV-2 virus.
Methodology We distributed a web-based survey among patients diagnosed with COVID-19 across the world and collected 190 responses regarding their demographics, histories, COVID-19 infection courses, and common symptoms.
Results We found that about 85.3% of the patients experienced some form of symptom following recovery from the infection. Among the reported symptoms, 59% of patients experienced fatigue or lethargy, 48.9% reported decreased stamina, 32.6% reported shortness of breath, 16.8% had a persistent cough, and 23.7% experienced anxiety following recovery from COVID-19.
Conclusions Reported symptoms closely resembled myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS); however, a deeper biochemical understanding of ME/CFS is required to confirm causation.
Source: Shaikh S, Siddiqi Z, Ukachukwu C, Mehkari Z, Khan S, Pamurthy K, Jahan F, Brown A. COVID-19: Post-recovery Manifestations. Cureus. 2023 Mar 29;15(3):e36886. doi: 10.7759/cureus.36886. PMID: 37128534; PMCID: PMC10147564. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10147564/ (Full text)
Long COVID disproportionately affects premenopausal women, but relatively few studies have examined Long COVID’s impact on female reproductive health. We conduct a review of the literature documenting the female reproductive health impacts of Long COVID which may include disruptions to the menstrual cycle, gonadal function, ovarian sufficiency, menopause, and fertility, as well as symptom exacerbation around menstruation.
Given limited research, we also review the reproductive health impacts of overlapping and associated illnesses including myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), postural orthostatic tachycardia syndrome (POTS), connective tissue disorders like Ehlers-Danlos syndrome (EDS), and endometriosis, as these illnesses may help to elucidate reproductive health conditions in Long COVID.
These associated illnesses, whose patients are 70%–80% women, have increased rates of dysmenorrhea, amenorrhea, oligomenorrhea, dyspareunia, endometriosis, infertility, vulvodynia, intermenstrual bleeding, ovarian cysts, uterine fibroids and bleeding, pelvic congestion syndrome, gynecological surgeries, and adverse pregnancy complications such as preeclampsia, maternal mortality, and premature birth. Additionally, in Long COVID and associated illnesses, symptoms can be impacted by the menstrual cycle, pregnancy, and menopause.
We propose priorities for future research and reproductive healthcare in Long COVID based on a review of the literature. These include screening Long COVID patients for comorbid and associated conditions; studying the impacts of the menstrual cycle, pregnancy, and menopause on symptoms and illness progression; uncovering the role of sex differences and sex hormones in Long COVID and associated illnesses; and addressing historical research and healthcare inequities that have contributed to detrimental knowledge gaps for this patient population.
Source: Pollack Beth, von Saltza Emelia, McCorkell Lisa, Santos Lucia, Hultman Ashley, Cohen Alison K., Soares Letícia. Female reproductive health impacts of Long COVID and associated illnesses including ME/CFS, POTS, and connective tissue disorders: a literature review. Frontiers in Rehabilitation Sciences, Vol 4, 2023, ISSN=2673-6861. DOI: 10.3389/fresc.2023.1122673 https://www.frontiersin.org/articles/10.3389/fresc.2023.1122673 (Full text)
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Introduction: Post-COVID-19 syndrome (PCS) is characterized by a wide range of symptoms, predominantly fatigue and exertional intolerance. While disease courses during the first year post infection have been repeatedly described, little is known about long-term health consequences.
Methods: We assessed symptom severity and various biomarkers at three time points post infection (3-8 months (mo), 9-16mo, 17-20mo) in 106 PCS patients with moderate to severe fatigue and exertional intolerance. A subset of patients fulfilled diagnostic criteria of myalgic encephalomyelitis/chronic fatigue syndrome (PCS-ME/CFS) based on the Canadian Consensus Criteria.
Results: While PCS-ME/CFS patients showed persisting symptom severity and disability up to 20mo post infection, PCS patients reported an overall health improvement. Inflammatory biomarkers equally decreased in both groups. Lower hand grip force at onset correlated with symptom persistence especially in PCS-ME/CFS.
Discussion: Debilitating PCS may persist beyond 20mo post infection, particularly in patients fulfilling diagnostic criteria for ME/CFS.
Source: Anna Franziska Legler, Lil Meyer-Arndt, Lukas Moedl, Claudia Kedor, Helma Freitag, Elena Steinle, Uta Hoppmann, Rebekka Rust, Frank Konietschke, Andreas Thiel, Friedemann Paul, Carmen Scheibenbogen, Judith Bellmann-Strobl. Symptom persistence and biomarkers in post-COVID-19/chronic fatigue syndrome – results from a prospective observational cohort.
medRxiv 2023.04.15.23288582; doi: https://doi.org/10.1101/2023.04.15.23288582 (Full text available as PDF file)
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The Long COVID/Post Acute Sequelae of COVID-19 (PASC) group includes patients with initial mild-to-moderate symptoms during the acute phase of the illness, in whom recovery is prolonged, or new symptoms are developed over months. Here, we propose a description of the pathophysiology of the Long COVID presentation based on inflammatory cytokine cascades and the p38 MAP kinase signaling pathways that regulate cytokine production.
In this model, the SARS-CoV-2 viral infection is hypothesized to trigger a dysregulated peripheral immune system activation with subsequent cytokine release. Chronic low-grade inflammation leads to dysregulated brain microglia with an exaggerated release of central cytokines, producing neuroinflammation. Immunothrombosis linked to chronic inflammation with microclot formation leads to decreased tissue perfusion and ischemia. Intermittent fatigue, Post Exertional Malaise (PEM), CNS symptoms with “brain fog,” arthralgias, paresthesias, dysautonomia, and GI and ophthalmic problems can consequently arise as result of the elevated peripheral and central cytokines.
There are abundant similarities between symptoms in Long COVID and myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). DNA polymorphisms and viral-induced epigenetic changes to cytokine gene expression may lead to chronic inflammation in Long COVID patients, predisposing some to develop autoimmunity, which may be the gateway to ME/CFS.
Source: Low RN, Low RJ, Akrami A. A review of cytokine-based pathophysiology of Long COVID symptoms. Front Med (Lausanne). 2023 Mar 31;10:1011936. doi: 10.3389/fmed.2023.1011936. PMID: 37064029; PMCID: PMC10103649. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10103649/ (Full text)
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Topic importance: Post-Acute Sequelae of SARS-CoV-2 (PASC) is a long-term consequence of acute infection from coronavirus disease 2019 (COVID-19). Clinical overlap between PASC and myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) has been observed, with shared symptoms including intractable fatigue, postexertional malaise, and orthostatic intolerance. The mechanistic underpinnings of such symptoms are poorly understood.
Review findings: Early studies suggest deconditioning as the primary explanation for exertional intolerance in PASC. Cardiopulmonary exercise testing (CPET) reveals perturbations related to systemic blood flow and ventilatory control associated with acute exercise intolerance in PASC, which are not typical of simple detraining. Hemodynamic and gas exchange derangements in PASC have substantial overlap with those observed with ME/CFS, suggestive of shared mechanisms.
Summary: This review aims to illustrate exercise pathophysiologic commonalities between PASC and ME/CFS that will help guide future diagnostics and treatment.
Source: Joseph P, Singh I, Oliveira R, Capone CA, Mullen MP, Cook DB, Stovall MC, Squires J, Madsen K, Waxman AB, Systrom DM. Exercise Pathophysiology in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome and Post-Acute Sequelae of SARS-CoV-2: More in Common Than Not? Chest. 2023 Apr 11:S0012-3692(23)00502-0. doi: 10.1016/j.chest.2023.03.049. Epub ahead of print. PMID: 37054777; PMCID: PMC10088277. https://pubmed.ncbi.nlm.nih.gov/37054777/
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Approximately 15% of adult Canadians with SARS-CoV-2 infection develop lingering symptoms beyond 12 weeks post-acute infection, known as post-COVID condition or long COVID. Some of the commonly reported long COVID cardiovascular symptoms include fatigue, shortness of breath, chest pain, and palpitations. Suspected long-term cardiovascular complications of SARS-CoV-2 infection may present as a constellation of symptoms that can be challenging for clinicians to diagnose and treat.
When assessing patients with these symptoms, clinicians need to keep in mind Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS), post-exertional malaise and post-exertional symptom exacerbation (PEM/PESE), cardiac dysautonomia such as Inappropriate Sinus Tachycardia (IST), and Postural Orthostatic Tachycardia Syndrome (POTS), and occasionally Mast Cell Activation Syndrome (MCAS).
This paper summarizes the globally evolving evidence around management of cardiac sequelae of long COVID. In addition, this review includes a Canadian perspective, consisting of a panel of expert opinions from experienced clinicians across Canada who have been involved in management of long COVID. The objective of this review is to offer some practical guidance to cardiologists and generalist clinicians regarding diagnostic and treatment approaches for adult patients with suspected long COVID who continue to experience unexplained cardiac symptoms.
Source: Quinn KL, Lam GY, Walsh JF, Bhéreur A, Brown AD, Chow CW, Christie Chung KY, Cowan J, Crampton N, Décary S, Falcone EL, Graves L, Gross DP, Hanneman K, Harvey PJ, Holmes S, Katz GM, Parhizgar P, Sharkawy A, Tran KC, Waserman S, Zannella VE, Cheung AM. Cardiovascular Considerations in the Management of People with Suspected Long COVID. Can J Cardiol. 2023 Apr 6:S0828-282X(23)00303-3. doi: 10.1016/j.cjca.2023.04.003. Epub ahead of print. PMID: 37030518. Quinn KL, Lam GY, Walsh JF, Bhéreur A, Brown AD, Chow CW, Christie Chung KY, Cowan J, Crampton N, Décary S, Falcone EL, Graves L, Gross DP, Hanneman K, Harvey PJ, Holmes S, Katz GM, Parhizgar P, Sharkawy A, Tran KC, Waserman S, Zannella VE, Cheung AM. Cardiovascular Considerations in the Management of People with Suspected Long COVID. Can J Cardiol. 2023 Apr 6:S0828-282X(23)00303-3. doi: 10.1016/j.cjca.2023.04.003. Epub ahead of print. PMID: 37030518. https://www.onlinecjc.ca/article/S0828-282X(23)00303-3/fulltext (Full text)
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Long COVID has become a significant global health and economic burden, yet there are currently no established diagnostic tools to identify which patients might benefit from specific treatments. One of the major pathophysiological factors contributing to Long COVID is the presence of hypercoagulability; this results in insoluble amyloid microclots that are resistant to fibrinolysis.
Our previous research using fluorescence microscopy has demonstrated a significant amyloid microclot load in Long COVID patients. However, this approach lacked statistical robustness, objectivity, and rapid throughput. In the current study, we have used imaging flow cytometry for the first time to show significantly increased concentration and size of these microclots.
We identified notable variations in size and fluorescence between microclots in Long COVID and those of controls even using a 20x objective. By combining cell imaging and the high-event-rate nature of a conventional flow cytometer, imaging flow cytometry can eliminate erroneous results and increase accuracy in gating and analysis beyond what pure quantitative measurements from conventional flow cytometry can provide.
Although imaging flow cytometry was used in our study, our results suggest that the signals indicating the presence of microclots should be easily detectable using a conventional flow cytometer. Flow cytometry is a more widely available technique which has been used in pathology laboratories for decades, rendering it a potentially more suitable and accessible method for detecting microclots in individuals suffering from both Long COVID and other conditions with similar pathology, such as myalgic encephalomyelitis.
Source: Turner, Simone and Laubscher, Gert Jacobus and Khan, M. Asad and Kell, Douglas and Pretorius, Etheresia, Rapid Flow Cytometric Analysis of Fibrin Amyloid Microclots in Long COVID. Available at SSRN: https://ssrn.com/abstract=4405265 or http://dx.doi.org/10.2139/ssrn.4405265 https://assets.researchsquare.com/files/rs-2731434/v1/0b4877b0-99fa-499c-9d65-3b6e43865d86.pdf?c=1680099696 (Full text)
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