High prevalence of electroencephalographic frontal intermittent rhythmic delta activity in patients with moderately severe COVID-19.

INTRODUCTION: The aim of our study was to analyse EEG findings in patients with COVID-19 not requiring respiratory support. MATERIAL AND METHODS: We reviewed EEGs performed in patients with COVID-19 between April 2020 and May 2021 at the University Hospital in Kraków, Poland. Demographic and clinical data, including comorbid conditions, discharge disposition, survival, neuroimaging findings, laboratory results, and treatment was collected. RESULTS: The study included 44 EEGs performed in 35 patients (51.4% females), aged 65.5 ± 13.9 years. Almost all patients had at least one comorbidity, and one-third had one or more preexisting neurological conditions. Three quarters of EEGs were abnormal. The most frequent EEG finding was background slowing (16 patients; 45.7%). Frontal findings included frontally predominant rhythmic delta (FIRDA) in 10 (28.6%) patients and focal slowing in the left frontal lobe. Patients with abnormal EEG significantly more often required oxygen supplementation (p = 0.003) and were less likely to recover (p = 0.048). CONCLUSIONS AND CLINICAL IMPLICATIONS: Patients with COVID-19 infection may frequently manifest with an abnormal EEG. FIRDA seems to be a frequent EEG pattern in less severe cases of COVID-19 infection. Future studies are needed to establish whether COVID-19 infection increases the risk for FIRDA, and to investigate its pathogenesis.

Course of fatigue among patients previously hospitalised due to COVID-19.

INTRODUCTION: Discrepancies exist regarding the clinical course and prognostic factors for post-COVID fatigue. Therefore, our aim was to assess the timely course of fatigue and its possible predictors in patients previously hospitalised due to SARS-CoV-2 infection. MATERIAL AND METHODS: Patients and employees of the University Hospital in Krakow were assessed with the use of a validated neuropsychological questionnaire. Included were participants aged 18 or more, previously hospitalised due to COVID-19, who completed questionnaires only once > 3 months after the onset of infection. Individuals were retrospectively asked about the presence of eight symptoms of chronic fatigue syndrome at four timepoints: before COVID-19, within 0-4 weeks, 4-12 weeks, and > 12 weeks post-infection. RESULTS: We enrolled 204 patients [40.2% women, median age 58 (46-66) years] evaluated after a median of 187 (156-220) days from the first positive nasal swab test for SARS-CoV-2. The most common comorbidities were hypertension (44.61%), obesity (36.27%), smoking (28.43%), and hypercholesterolemia (21.08%); none of the patients required mechanical ventilation during hospitalisation. Before COVID-19, 43.62% of patients reported at least one symptom of chronic fatigue. Within 4, 4-12, and > 12 weeks after COVID-19, the prevalence of chronic fatigue was 76.96%, 75.49%, and 66.17%, respectively (all p < 0.001). The frequency of chronic fatigue symptoms decreased within > 12 weeks following the onset of infection but did not return to baseline values, except for self-reported lymph node enlargement. In a multivariable linear regression model, the number of fatigue symptoms was predicted by female sex [ß 0.25 (0.12; 0.39), p < 0.001 and 0.26 (0.13; 0.39), p < 0.001 for weeks 0-12 and > 12, respectively], and age [for < 4 weeks, ß -0.12 (-0.28; -0.01), p = 0.029]. CONCLUSIONS: Most patients previously hospitalised due to COVID-19 suffer from fatigue > 12 weeks after infection onset. The presence of fatigue is predicted by female sex and - only for the acute phase - age.

Sex-related patient-reported brain fog symptoms in non-hospitalised COVID-19 patients.

INTRODUCTION: Previous studies on the prognostic role of sex in post-COVID-associated brain fog have yielded divergent results. Moreover, limited evidence exists regarding the evolution of brain fog symptoms over time, especially in ambulatory patients and separately for women and men. Therefore, the aim of the current study was to assess brain fog symptoms in nonhospitalised patients with COVID-19, according to their sex. MATERIAL AND METHODS: We created a neuropsychological questionnaire including eight questions on the presence of brain fog symptoms in the following four time periods: before COVID-19, and 0-4, 4-12, and > 12 weeks post-infection. The validity and reliability of the questionnaire were assessed. In this cross-sectional study, questionnaires were filled out anonymously and retrospectively once only by patients or through a survey link posted online. Included were patients ≥ 18 years, with > 3 months since the SARS-CoV-2 infection onset confirmed by RT-PCR from a nasopharyngeal swab. RESULTS: The study included 303 patients (79.53% women, 47.52% medical personnel). Median time between COVID-19 onset and questionnaire completion was 208 (IQR 161-248) days. Women, compared to men, reported a higher prevalence of problems with writing, reading, and counting (< 4 weeks, OR 3.05, 95% CI: 1.38-6.72; 4-12 weeks, OR 2.51, 95% CI: 1.02-6.14; > 12 weeks, OR 3.74, 95% CI: 1.12-12.56) and thoughts communication (< 4 weeks, OR 2.53, 95% CI: 1.41-4.54; 4-12 weeks, OR 3.74, 95% CI: 1.93-7.24; > 12 weeks, OR 2.00, 95% CI: 1.01-3.99). The difference between the two sexes in answering questions in an understandable/unambiguous manner was statistically significant between four and 12 weeks after infection (OR 2.63, 95% CI: 1.36-5.10), while a sex difference in recalling new information was found below 12 weeks (OR 2.54, 95% CI: 1.44-4.48 and OR 2.43, 95% CI: 1.37-4.31 for < 4 and 4-12 weeks, respectively). No sex differences in reporting problems with multitasking, remembering information from the past, determining the current date, or field orientation were noted. CONCLUSIONS: Non-hospitalised women and men retrospectively report a different course of COVID-19-associated brain fog.

COVID-19 among patients with epilepsy: Risk factors and course of the disease.

INTRODUCTION: The study assessed the prevalence and risk factors for SARS-CoV-2 infection in patients with epilepsy (PWE). Additionally, the course of COVID-19 and its impact on seizure control was investigated. MATERIAL AND METHODS: Subjects with definite (confirmed by positive RT-PCR nasopharyngeal swab or serum anti-SARS-CoV-2 antibodies) and probable COVID-19 were identified via telephone survey among PWE treated at the university epilepsy clinic. RESULTS: Of 252 screened subjects, 17 (6.7%) had definite and 14 (5.5%) probable COVID-19. The percentage of PWE with definite COVID-19 was much higher than the percentage of subjects with confirmed COVID-19 in Polish general population (3.65%). In the heterogenous population of PWE, including patients with drug-resistant epilepsy, physical/intellectual disability, and comorbidities, we were not able to identify any risk factors for contracting COVID-19. The course of infection was mild or moderate in all subjects, not requiring oxygen therapy or respiratory support. The most common symptoms were fever, fatigue, headaches, muscle aches, and loss of smell/taste and continued for approximately 7-21 days, except for loss of smell/taste which lasted usually several weeks. Seizure exacerbation was noted in only one pregnant patient with confirmed COVID-19 and it was likely related to decreased serum level of levetiracetam in the third trimester. CONCLUSION: The study provided reassuring findings related to the low risk of seizure exacerbation in PWE during the course of COVID-19. Patients with epilepsy may be at increased risk of SARS-CoV-2 infection. Epilepsy characteristics are not likely to modify the risk of COVID-19.

Neurological symptoms in hospitalised patients with COVID-19 and their association with in-hospital mortality.

OBJECTIVES: To evaluate the spectrum of neurological symptoms in patients with COVID-19 during the first 14 days of hospitalisation and its association with in-hospital mortality. MATERIAL AND METHODS: We included 200 patients with RT-PCR-confirmed COVID-19 admitted to University Hospital in Krakow, Poland. In 164 patients, a detailed questionnaire concerning neurological symptoms and signs was performed prospectively within 14 days of hospitalisation. In the remaining 36 patients, such questionnaires were completed retrospectively based on daily observations in the Department of Neurology. RESULTS: During hospitalisation, 169 patients (84.5%) experienced neurological symptoms; the most common were: fatigue (62.5%), decreased mood (45.5%), myalgia (43.5%), and muscle weakness (42.5%). Patients who died during hospitalisation compared to the remainder were older (79 [70.5-88.5] vs. 63.5 [51-77] years, p = 0.001), and more often had decreased level of consciousness (50.0% vs. 9.3%, p < 0.001), delirium (33.3% vs. 4.4%, p < 0.001), arterial hypotension (50.0% vs. 19.6%, p = 0.005) or stroke during (18.8% vs. 3.3%, p = 0.026) or before hospitalisation (50.0% vs. 7.1, p < 0.001), whereas those who survived more often suffered from headache (42.1% vs. 0%, p = 0.012) or decreased mood (51.7% vs. 0%, p = 0.003). CONCLUSIONS: Most hospitalised patients with COVID-19 experience neurological symptoms. Decreased level of consciousness, delirium, arterial hypotension, and stroke during or before hospitalisation increase the risk of in-hospital mortality.

Association between brain fog, cardiac injury, and quality of life at work after hospitalization due to COVID-19.

BACKGROUND: To evaluate incidence and search for possible predictors of brain fog and quality of life at work (QoL-W) among low-to-moderate risk subjects previously hospitalized due to COVID-19. MATERIAL AND METHODS: Participants aged ≥18 retrospectively reported 8 brain fog symptoms pre-COVID-19, at 0-4, 4-12 and >12 weeks post-infection via validated clinical questionnaire. The QoL-W was assessed with a 4-point Likert scale where 0, 1, 2, and 3 meant no, mild, moderate, and severe impairment in performing activities at work, respectively. Data on age, sex, comorbidities, and laboratory results (including first in-hospital high-sensitivity cardiac troponin I [hs-cTnI] measurement) were gathered. RESULTS: The study included 181 hospitalized subjects (age Me = 57 years), 37.02% women. Most had low disease severity (Modified Early Warning Score = 1, 77.90%) and low comorbidity (Charlson Comorbidity Index 0: 28.72%, 1-2: 34.09%), with no intensive care unit treatment needed. COVID-19 led to almost 3-fold increased brain fog symptoms, with incidence of 58.56%, 53.59%, and 49.17% within 4, 4-12, and >12 weeks, respectively (p < 0.001). First in-hospital hs-cTnI levels were 47.3% higher in participants who later presented with brain fog at median follow-up of 26.7 weeks since the diagnosis of the SARS-CoV-2 infection. Individuals who experienced at least one brain fog symptom at follow-up, had elevated hs-cTnI, less often presented with atrial fibrillation, and used anticoagulants during initial hospitalization due to COVID-19. The Hs-cTnI >11.90 ng/l predicted brain fog symptoms in multivariable model. COVID-19 was associated with 3.6­fold, 3.0­fold, and 2.4-fold QoL-W deterioration within 4, 4-12, and >12 weeks post-infection (p < 0.05). Subjects with QoL-W decline >12 weeks were younger, mostly women, had more brain fog symptoms, and higher platelet counts. Multivariable models with self-reported brain fog symptoms (responding coherently and recalling recent information), age, and sex exhibited good discriminatory power for QoL-W impairment (area under the receiver operating characteristic curve 0.846, 95% CI: 0.780-0.912). CONCLUSIONS: This study highlighted that in non-high-risk subjects hospitalized during the first 2 pandemic's waves: 1) brain fog was common, affecting nearly half of individuals, and impacting QoL-W >12 weeks after initial infection, 2) after 3 months of COVID-19 onset, the decline in QoL-W was primarily attributed to brain fog symptoms rather than demographic factors, health conditions, admission status, and laboratory findings, 3) components of brain fog, such as answering in an understandable way or recalling new information increased the likelihood of significantly lower QoL-W up to tenfold, 4) biochemical indicators, such as the first hs-cTnI level, might predict the risk of experiencing brain fog symptoms and indirectly decreased QoL-W >12 weeks after COVID-19 onset. Occupational medicine practitioners should pay particular attention to younger and female subjects after COVID-19 complaining of problems with answering questions in understandable way or recalling new information as they have an increased risk of QoL-W impairment. Med Pr Work Health Saf. 2024;75(1):3-17.

Fatigue after COVID-19 in non-hospitalized patients according to sex.

BACKGROUND: Limited evidence exists on sex differences in post-COVID fatigue among non-hospitalized patients. Therefore, aim of the study was to evaluate the course of chronic fatigue symptoms in non-hospitalized subjects with the SARS-CoV-2 infection, according to sex. METHODS: Patients and staff from the University Hospital in Krakow anonymously and retrospectively completed neuropsychological questionnaire that included eight symptoms of chronic fatigue syndrome. The presence of these symptoms was assessed before COVID-19 and 0-4, 4-12, and >12 weeks postinfection. The inclusion criteria were as follows: age 18 or more years, >12 weeks since the onset of the SARS-CoV-2 infection, and diagnosis confirmed by the RT-PCR from anasopharyngeal swab. RESULTS: We included 303 patients (79.53% women, 47.52% medical personnel) assessed retrospectively after a median of 30 (interquartile range: 23-35) weeks since the onset of symptoms. A higher prevalence of at least one chronic fatigue symptom was found in females in all time intervals after the onset of COVID-19 compared to males (p < .036). Women, compared to men, more often experienced persistent fatigue, not caused by effort and persisting after rest (for <4 weeks, odds ratio [OR] = 2.31, 95% confidence interval [CI]: 1.13-4.73; for 4-12 weeks, OR = 1.95, 95% CI: 1.06-3.61), non-restorative sleep (for <4 weeks, OR = 2.17, 95% CI: 1.23-3.81; for >12 weeks, OR = 1.95, 95% CI: 1.03-3.71), and sore throat (for <4 weeks, OR = 1.97, 95% CI: 1.03-3.78; for 4-12 weeks, OR = 2.76, 95% CI: 1.05-7.27). Sex differences in headache, arthralgia, and prolonged postexercise fatigue were observed only during the first 4 weeks (OR = 2.59, 95% CI: 1.45-4.60, OR = 2.97, 95% CI: 1.02-8.64, and OR = 1.87, 95% CI: 1.01-3.51, respectively). There were no differences between women and men in myalgia and self-reported lymph node enlargement. CONCLUSIONS: The course of post-COVID fatigue differs significantly between sexes in non-hospitalized individuals with COVID-19, with women more often suffering from persistent fatigue, not caused by effort and persisting after rest, non-restorative sleep, and sore throat.

Brain Fog and Quality of Life at Work in Non-Hospitalized Patients after COVID-19.

Background: There is still a need for studies on the quality of life (QoL) at work among COVID-19 survivors. Therefore, we aimed to evaluate the association between the brain fog symptoms and the QoL at work in non-hospitalized patients with previous SARS-CoV-2 infection. Methods: Three hundred non-hospitalized patients (79.33% women; median age, 36 years; interquartile range, 30-48 years) were included in the final analysis. An anonymous neuropsychological questionnaire containing eight different questions on the presence of brain fog symptoms in four time intervals, i.e., pre-COVID-19 and 0-4, 4-12, and >12 weeks after infection, was retrospectively introduced to patients and staff of the University Hospital in Krakow. Additionally, a four-point Likert scale was used to evaluate QoL at work in four time periods. Included were participants aged ≥ 18 years in whom the diagnosis of COVID-19 was confirmed by the RT-PCR from nasopharyngeal swab and the first symptoms occurred no earlier than 3 months before the completion of the questionnaire. Results: Before SARS-CoV-2 infection, 28.00% (n = 84) of patients reported poor QoL at work. Within 4, 4-12, and >12 weeks after infection, a decrease in QoL was observed in 75.67% (n = 227), 65.00% (n = 195), and 53.66% (n = 161) of patients, respectively (p < 0.001). With increasing deterioration of the QoL at work, the number of brain fog symptoms increased, and patients with severe QoL impairment exhibited a median of five symptoms for <4, 4-12, and >12 weeks post-COVID-19. In the multivariable logistic regression model, predictors of the deterioration of the QoL at work depended on the time from COVID-19 onset; in the acute phase of the disease (<4 weeks), it was predicted by impairment in remembering information from the past (OR 1.88, 95%CI: 1.18-3.00, p = 0.008) and multitasking (OR 1.96, 95%CI: 1.48-2.58, p < 0.001). Furthermore, an impairment in the QoL at work 4-12 weeks and >12 weeks after COVID-19 was independently associated with age (OR 0.46, 95%CI: 0.25-0.85, p = 0.014 and OR 1.03, 95%CI: 1.01-1.05, p = 0.025, respectively), problems with multitasking (OR 2.05, 95%CI: 1.40-3.01, p < 0.001 and OR 1.75, 95%CI: 1.15-2.66, p = 0.009, respectively), answering questions in an understandable/unambiguous manner (OR 1.99, 95%CI: 1.27-3.14, p = 0.003 and OR 2.00, 95%CI: 1.47-2.36, p = 0.001, respectively), and, only for the >12 week interval, problems with remembering information from the past (OR 2.21, 95%CI: 1.24-3.92, p = 0.007). Conclusions: Certain brain fog symptoms, such as impaired memory or multitasking, are predictors of a poorer QoL at work not only during the acute phase of COVID-19 but also within more than 12 weeks after the onset of infection.

Neurological Prognostic Factors in Hospitalized Patients with COVID-19.

We aimed to search whether neurological symptoms or signs (NSS) and the MEWS (Modified Early Warning Score) score were associated with in-hospital mortality or oxygen requirement during the first 14 days of hospitalization in COVID-19 patients recruited at the University Hospital in Krakow, Poland. The detailed clinical questionnaires on twenty NSS were either filled out by patients prospectively or retrospectively assessed by neurologists based on daily medical records. NSS were considered high or low-risk if they were associated with increased or decreased mortality in the univariable analysis. This cohort study included 349 patients with COVID-19 (median age 64, interquartile range (51-77), women 54.72%). The presence of high-risk NSS (decreased level of consciousness, delirium, seizures, and symptoms of stroke or transient ischemic attack) or its combination with the absence of low-risk NSS (headache, dizziness, decreased mood, and fatigue) increased the risk of in-hospital mortality in SARS-CoV-2 infection 3.13 and 7.67-fold, respectively. The presence of low-risk NSS decreased the risk of in-hospital mortality in COVID-19 patients more than 6-fold. Death in patients with SARS-CoV-2 infection, apart from NSS, was predicted by older age, neoplasm, and higher MEWS scores on admission. High-risk NSS or their combination with the absence of low-risk NSS increased the risk of oxygen requirement during hospitalization in COVID-19 patients 4.48 and 1.86-fold, respectively. Independent predictors of oxygen therapy during hospitalization in patients with SARS-CoV-2 infection were also older age, male sex, neoplasm, and higher MEWS score on admission.