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Erschienen in: Neurological Sciences 12/2021

Open Access 15.09.2021 | COVID-19 | COVID-19

Long-term neurological manifestations of COVID-19: prevalence and predictive factors

verfasst von: Andrea Pilotto, Viviana Cristillo, Stefano Cotti Piccinelli, Nicola Zoppi, Giulio Bonzi, Davide Sattin, Silvia Schiavolin, Alberto Raggi, Antonio Canale, Stefano Gipponi, Ilenia Libri, Martina Frigerio, Michela Bezzi, Matilde Leonardi, Alessandro Padovani

Erschienen in: Neurological Sciences | Ausgabe 12/2021

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Abstract

Background

Clinical investigations have argued for long-term neurological manifestations in both hospitalised and non-hospitalised COVID-19 patients. It is unclear whether long-term neurological symptoms and features depend on COVID-19 severity.

Methods

From a sample of 208 consecutive non-neurological patients hospitalised for COVID-19 disease, 165 survivors were re-assessed at 6 months according to a structured standardised clinical protocol. Prevalence and predictors of long-term neurological manifestations were evaluated using multivariate logistic regression analyses.

Results

At 6-month follow-up after hospitalisation due to COVID-19 disease, patients displayed a wide array of symptoms; fatigue (34%), memory/attention (31%) and sleep disorders (30%) were the most frequent. At neurological examination, 40% of patients exhibited neurological abnormalities, such as hyposmia (18.0%), cognitive deficits (17.5%), postural tremor (13.8%) and subtle motor/sensory deficits (7.6%). Older age, premorbid comorbidities and severity of COVID-19 were independent predictors of neurological manifestations in logistic regression analyses.

Conclusions

Premorbid vulnerability and severity of SARS-CoV-2 infection impact on prevalence and severity of long-term neurological manifestations.
Hinweise

Supplementary Information

The online version contains supplementary material available at https://​doi.​org/​10.​1007/​s10072-021-05586-4.

Publisher’s note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Introduction

After the first cases of the novel coronavirus disease 2019 (COVID-19) were reported in Wuhan, China, in December 2019, the spread rapidly in Europe became a pandemic, involving millions of cases worldwide [1]. With the increasing number of confirmed cases and the accumulating clinical data, it is now well established that, in addition to the predominant respiratory symptoms, a significant proportion of COVID-19 patients experience neurological symptoms and syndromes [25]. Clinical findings on previously hospitalised and non-hospitalised patients with COVID-19 reported the persistence of multiple symptoms, particularly fatigue, dyspnoea, sleep disturbances and memory complaints syndromes [68]. Accordingly, some authors have suggested the so-called, but not yet defined, post-COVID-19 syndrome based on persistent symptoms reported after resolution of SARS-CoV-2 infection [8]. To date, however, the prevalence and severity of neurological long-term manifestations and the correlation with severity of COVID-19 infection are still under debate, as no long-term data using extensive neurological assessment are still available yet in the growing literature.
In this study, subjects previously hospitalised for COVID-19 disease entered a longitudinal study in order to evaluate general and neurological manifestations after 6 months of follow-up and their potential relationship with premorbid conditions and severity of respiratory infection.

Methods

All patients who survived COVID-19 disease and were discharged between February and April 2020 from a COVID-19 Unit of the ASST Spedali Civili Brescia Hospital were asked to participate in a follow-up study. This includes a standardised evaluation of medical history, self-reported neurological symptoms and a complete neurological examination at 6 months. Premorbid conditions were recorded at admission using the Cumulative Illness Rating Scale [9] (CIRS). Patients with premorbid neurological conditions (including dementia) were excluded. Hospitalisation data included the severity of COVID-19 disease, classified according to the Brescia-COVID Respiratory Severity Scale (BCRSS), stratifying patients into mild, moderate and severe [10] and the quick Sequential Organ Failure Assessment (qSOFA) score [11].
At follow-up, data were collected using a structured questionnaire evaluating the presence of neurological symptoms related to central, peripheral, myopathic and cognitive manifestations via telemedicine (Supplementary Table 1). Each patient was additionally asked to undergo a complete neurological examination in the hospital in order to objectively assess cranial nerves, motor (global and focal), sensory, cerebellar, basal ganglia-related function, deep tendon reflexes, pyramidal signs. Global cognitive function was carried out by using the Montreal Cognitive Assessment (MoCA) by Italian validated norms [12]. The study was approved by the local ethics committee of ASST “Spedali Civili di Brescia” Hospital and the requirement for informed consent was waived by the Ethics Commission (NP 4166).

Statistical analysis

Differences between patients according to COVID-19 respiratory severity (BCRSS) and the association with neurological complaints were evaluated by Fisher’s exact test or ANOVA with Bonferroni correction for dichotomic and continuous variables, respectively. To explore the risk factors associated with neurological symptoms and neurological features, univariable and multivariable logistic regression models were implemented.
Separate binary logistic regression analyses adjusted for age and sex evaluated the relationship between COVID-19 severity (moderate/severe vs mild-independent variable) with specific neurological symptoms (dependent variable). A multivariate linear regression model evaluated the relationship between total number of symptoms reported (dependent variable) and the following independent variable: age, sex, premorbid CIRS, days of hospitalisation and COVID-19 severity.
The relationship between the same independent variables and the presence of neurological abnormalities at the examination were first tested using univariate analyses and confirmed in multivariate logistic regression model. The strength of association between dependent and independent variables was evaluated using standard beta coefficient (beta) and Exp (B) for linear and logistic multivariable regression, respectively.

Results

From a sample of 208 consecutively hospitalised patients for COVID-19 disease, 33 deceased during hospitalisation. Survivors were younger (p=0.001; 65.7±12.6 vs 78.6±8.6) and exhibited less comorbidities (p=0.004, mean CIRS 1.36±0.51 vs 1.51±0.4) and lower COVID-19 severity (p=0.001, mean BCRSS 0.90±0.85 vs 2.89 ± 0.32) compared to deceased patients.
Out of 175 survivors, five patients died after discharge, three had a previous diagnosis of dementia and two refused to participate, resulting in a final sample of 165 patients (Supplementary Figure1). Patients stratified according to COVID-19 severity (BCRSS) differ for the number of days of hospitalisation, O2 treatment and qSOFA but not for age or premorbid CIRS (Table 1).
Table 1
Demographic and clinical characteristics of the sample according to COVID-19 severity
 
Total (n=165)
Mild (n=57)
Moderate (n=77)
Severe (n=31)
p value
Age, years
64.8 ± 12.6
62.3 ± 13.1
67.3 ± 12.3
63.2 ± 11.2
0.06
Sex, female n (%)
50 (30.3%)
22 (38.5%)
18 (23.4%)
10 (32.2%)
0.16
Days of hospitalisation
11.6 ± 8.8
7.8 ± 4.2
12.3 ± 9.4
17.1 ± 10.4
0.001#¶*
Oxygen therapy, n (%)
128 (77.6%)
20 (35.1%)
77 (100%)
31 (100%)
0.001¶
Non-invasive ventilation, n (%)
18 (11.0%)
0 (0%)
0 (0%)
18 (58.3%)
0.001#¶
Intubation, n (%)
2 (1.2%)
0 (0%)
0 (0%)
2 (6.4%)
0.001#¶
qSOFA
0.44 ± 0.53
0.0 ± 0.0
0.48 ± 0.50
1.10 ± 0.29
0.001#¶*
CIRS pre-total
18.6 ± 3.3
18.1 ± 3.2
19.4 ± 3.6
17.9 ± 2.8
0.03
CIRS, pre-severity mean
1.35 ± 0.25
1.31 ± 0.24
1.40 ± 0.26
1.28 ± 0.20
0.02
*Significant for the comparison between mild vs moderate groups
#Significant for the comparison between moderate vs severe groups
Significant for the comparison between mild vs severe groups
At follow-up, no patients reported new hospitalisations or new onset of medical conditions. The most common symptoms reported were fatigue (34%), memory complaints (31%), sleep disorders (30.8%) and myalgias (29.6%), followed by depression/anxiety, visual disturbances, paraesthesia and hyposmia (Figure 1, Supplementary Table 2). Patients with moderate/severe COVID-19 reported higher number of symptoms at follow-up (p=0.004) after correction for age and premorbid CIRS. In univariable analyses, moderate/severe COVID-19 was associated with increased risk of memory complaints (OR 2.6, 95% CI 1.18–5.8), loss of dependency in IADL (OR 2.6, 95% CI 1.12–6.2), confusion (OR 2.9, 95% CI 1.12–7.8), fatigue (OR 2.1, 95% CI 0.95–4.6) and visual disturbances (OR 3.5, 95% CI 1.5–8.4) at 6 months of follow-up compared to mild disease. Multivariable analyses identified premorbid comorbidities (p=0.006, beta 0.26), age at admission (p=0.048, beta 0.17) and severity of COVID-19 (p=0.04, beta 0.22) as predictors of total number of symptoms reported.
One-hundred and five patients (63.6%) were further evaluated using a standard neurological examination and cognitive screening. This group of patients were comparable to patients evaluated via telemedicine for age, sex distribution, premorbid CIRS, severity of COVID-19 and reported neurological symptom. At standard examination, 42/105 (40%) exhibited neurological abnormalities, including subjective dysgeusia/hyposmia (n=19), enhanced physiological tremor (n=15) and cognitive impairment (n=17). Two patients exhibited isolated feet hypoesthesia and two reached a diagnosis of sensor-motor polyneuropathy, with distal mild sensory and motor deficits (bilateral deficits within the extension of feet 4/5 MRC) confirmed by electrophysiological study. No alterations within cranial nerves, cerebellar function or pyramidal signs were detected.
Neurological abnormalities at the examination were associated with older age (p=0.005), higher number of premorbid comorbidities (p=0.001), higher COVID-19 severity (p=0.05), longer hospitalisation (p=0.002) and higher number of neurological symptoms reported (p=0.007). Logistic regression analyses adjusted for age and sex identified duration of hospitalisation (p=0.02, Exp (B) 1.19) and premorbid comorbidities (p=0.03, Exp(B)1.19) as the best predictors of neurological abnormalities at examination.

Discussion

Findings showed that previously hospitalised COVID-19 patients reported a wide array of neurological symptoms 6 months after SARS-CoV-2 infection, predicted by combination of age, premorbid conditions and severity of the disease.
These data extend recent studies which have argued for a high prevalence of post-COVID clinical manifestations and claimed that long-term consequences of COVID-19 involve both central and peripheral nervous systems [68, 13, 14].
In the present cohort of patients with 6 months of follow-up and extensive neurological evaluation, the most prevalent symptoms reported were fatigue, memory complaints, sleep disorders and myalgias followed by depression/anxiety, visual disturbances, paraesthesia and hyposmia. These findings extended the earlier works of Carfi [7] and Goertz [8], reporting a high persistence of respiratory symptoms and fatigue in more than half of hospitalised and non-hospitalised patients 3 months after COVID-19. In our study, long-term neurological complaints showed different distributions according to COVID-19 severity, which was associated with an increased total number of symptoms, fatigue, memory complaints and confusion. The impact of SARS-CoV-2 severity in long-term persistent respiratory symptoms and fatigue has been recently highlighted by a large survey 6 months after discharge in Wuhan [6]. Our study, conducted in smaller but more homogeneous older population consecutively enrolled in a single COVID-19 unit, suggests that even small differences in the severity of infection can impact long-term neurological manifestations. This effect was prominent for cognitive symptoms, including memory complaints and attention deficits—whereas other symptoms—such as myalgias or numbness—appeared to be independent of severity. This might suggest a higher vulnerability of the central nervous system to severe SARS-CoV-2 infection possibly through higher general inflammatory response and longer hospitalisation—as already highlighted for other infectious diseases [15]. We found age and premorbid comorbidities as important independent predictors of long-term symptoms, at variance with the data reported by Huang and coauthors for respiratory symptoms and fatigue [6]. These findings are of particular interest, as we excluded patients with premorbid dementia or other known neurological conditions or patients with neurologic COVID-19 presentation [5], focusing on neurological features in patients with prominent respiratory COVID-19 disease [16].
At standardised neurological examination, 40% of subjects exhibited mild abnormalities—not reported before the hospitalisation for COVID-19 disease. The most prevalent features were hyposmia, cognitive impairment, enhanced physiological tremor and subtle motor and sensory low-limb deficits in several cases. Age, premorbid comorbidities and longer hospitalisation were, again, the strongest predictors of neurological abnormalities at examination, notwithstanding if the numbers did not allow separate analyses for different neurological features. This would suggest that SARS-CoV-2 infection has probably a stronger long-term neurological impact in older subjects with higher vulnerability who suffered an acute respiratory syndrome. The complex interaction between physical and brain resilience and long-term disability after hospitalisation has been indeed already demonstrated for other infectious diseases, such as community-acquired pneumonia [15]. In fact, we need to acknowledge that the experience of hospitalisation due to COVID-19 in frail elderly should is an important confounding factor—as it can influence the relationship between long-term manifestations and psychosocial long-term disturbances [1719].
Several limitations should be acknowledged. First, premorbid conditions were based on medical records and assessment during hospitalisation thus not allowing a complete premorbid neurological screening. Second, we excluded from the study patients with neurological disorders before or concomitant the acute phase of SARS-CoV-2 infection, thus potentially underestimating the global neurological burden due to COVID-19. Furthermore, this is a single-centre study conducted in an homogeneous cohort of patients with moderate severity of COVID-19 and large studies including intubated and non-hospitalised patients are warranted to confirm these findings.
Limitations notwithstanding, our findings indicate that several neurological features are a relevant component of long-term manifestations of COVID-19 disease especially in more vulnerable and severe patients, thus underlying the clinical need for longitudinal programmes able to track the real impact of SARS-CoV-2 infection on long-term brain health status [1821].

Acknowledgements

The authors thank all the participants for their participation.

Declarations

Conflict of interest

Andrea Pilotto served on the advisory board of Z-cube (technology division of Zambon pharmaceuticals); he received honoraria from Z-cube s.r.l., Biomarin, Zambon, Abbvie, Nutricia and Chiesi pharmaceuticals. He received research support from Vitaflo Germany and Zambon Italy.
Viviana Cristillo has no financial conflicts to disclose.
Stefano Cotti Piccinelli has no financial conflicts to disclose.
Nicola Zoppi has no financial conflicts to disclose.
Giulio Bonzi has no financial conflicts to disclose.
Davide Sattin has no financial conflicts to disclose.
Silvia Schiavolin has no financial conflicts to disclose.
Alberto Raggi has no financial conflicts to disclose.
Antonio Canale has no financial conflicts to disclose.
Stefano Gipponi has no financial conflicts to disclose.
Ilenia Libri has no financial conflicts to disclose.
Martina Frigerio has no financial conflicts to disclose.
Michela Bezzi has no financial conflicts to disclose.
Matilde Leonardi has no financial conflicts to disclose.
Alessandro Padovani is consultant and served on the scientific advisory board of GE Healthcare, Eli-Lilly and Actelion Ltd. Pharmaceuticals and received speaker honoraria from Nutricia, PIAM, Langstone Technology, GE Healthcare, Lilly, UCB Pharma and Chiesi Pharmaceuticals. He is funded by grant of the Ministry of University (MURST).

Ethical approval

The study was approved by the local ethics committee of ASST “Spedali Civili di Brescia” Hospital and the requirement for informed consent was waived by the Ethics Commission (NP 4166).
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://​creativecommons.​org/​licenses/​by/​4.​0/​.

Publisher’s note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Metadaten
Titel
Long-term neurological manifestations of COVID-19: prevalence and predictive factors
verfasst von
Andrea Pilotto
Viviana Cristillo
Stefano Cotti Piccinelli
Nicola Zoppi
Giulio Bonzi
Davide Sattin
Silvia Schiavolin
Alberto Raggi
Antonio Canale
Stefano Gipponi
Ilenia Libri
Martina Frigerio
Michela Bezzi
Matilde Leonardi
Alessandro Padovani
Publikationsdatum
15.09.2021
Verlag
Springer International Publishing
Schlagwort
COVID-19
Erschienen in
Neurological Sciences / Ausgabe 12/2021
Print ISSN: 1590-1874
Elektronische ISSN: 1590-3478
DOI
https://doi.org/10.1007/s10072-021-05586-4

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