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. 2022 Sep 30;82:104758. doi: 10.1016/j.amsu.2022.104758

Table 1.

Characteristics of included studies.

S # Author Study type No of cases Patient S# Past History/comorbids Age/sex GBS Present? Affected side of face COVID-19 vaccine name/type Which dose led to a symptom? onset of facial symptom after last vaccination Clinical features of facial palsy Other complaints Examination results CSF analysis results Investigation Treatment Treatment outcome
1 Colella et al. LTE 1 1 None 37/M No Left Pfizer-BioNTech 1 5 days left facial droop, lagophthalmos and mild labial hypomobility with flattening of forehead's skin and nasolabial fold. Malaise, fatigue, headache, left latero-cervical pain and monolateral muscular weakness N/A N/A N/A prednisone, eye drops and night time eye dressing PR
2 Finsterer et al. Case report 1 1 GBS 32/M Yes Right vector-based vaccine 1 8 days dysphagia peripheral limb paraesthesia, muscle weakness and headache Neurologic: Right peripheral facial palsy affecting orbicularis oris muscle, motor: B/L muscle weakness and DTR reduced Protein: elevated MRI brain and cervical spine: B/L few nonspecific T2-hyperintensities in the white matter IVIg and plasmapheresis PR
3 Repajic et al. Case report 1 1 Bell's palsy and HTN 57/F No Left Pfizer-BioNTech 2 1 day left facial droop and lagophthalmos, left ear otalgia and aguesia jaw pain Neurologic: consistent with CN7 palsy; motor, sensory, gait and cerebellar examination normal. N/A N/A prednisone and antivirals CR
4 Nishizawa et al. Case report 1 1 T2DM, HTN and hyperlipidemia 62/F No Right J&J/Janssen COVID-19 vaccine N/A 20 days Right facial paralysis, lagophthalmos HB grade VI None Physical: consistent with facial palsy; motor, sensory, gait and cerebellar examination normal. N/A Head CT and brain MRI: unremarkable N/A N/A
5 Martin-Villares et al. LTE 1 1 Bell's palsy 34/F No Right Moderna COVID-19 vaccine 1 2 days right facial pain, facial palsy HB grade III None N/A N/A MRI: unremarkable Deflazacort, eye support, facial rehabilitation CR
6 Maramattom et al. Case series 7 1 None 43/F Yes B/L Oxford-Astrazeneca 1 after 20 days facial diplegia upper back pain, areflexic quadriparesis and respiratory failure sensory: normal; motor strength: severely weakened muscle power and areflexia Albuminocytological dissociation N/A IVIg and MV CR
2 N/A 67/F Yes B/L same 1 16 days facial diplegia and dysphagia distal paraesthesia, limb weakness and respiratory failure CN: Right abducens palsy, facial diplegia, and bulbar palsy
Sensory: abnormal; motor strength: severely weakened muscle power and areflexia
Albuminocytological dissociation MRI Brain: unremarkable MV, IVIg and plasmapheresis PR
3 N/A 53/F Yes Right same 1 12 days facial and tongue numbness B/L LL numbness, weakness, back pain and Respiratory failure CN: Right facial and tongue numbness, facial diplegia. Sensory - B/L LL distal sensory impairment (pinprick and vibration), right trigeminal V2–V3 sensory impairment (touch, pinprick). Areflexia Albuminocytological dissociation
MRI Brain: unremarkable
MV and IVIg PR
4 N/A 68/F Yes B/L same 1 18 days B/L facial numbness, LMN facial weakness and dysphagia B/L UL and LL numbness, weakness, areflexic flaccid quadriplegia and respiratory failure CN: facial diplegia, bulbar palsy, B/L facial numbnessSensory: B/L distal UL and LL numbness, (distal LL pinprick impairment), B/L sensory impairment to touch in all 3 divisions of the trigeminal nerve, areflexia Albuminocytological dissociation
MRI Brain: unremarkable
MV and IVIg PR
5 N/A 70/M Yes B/L same 1 11 days facial diplegia, B/L facial numbness and bulbar palsy B/L distal UL and LL numbness and respiratory failure CN: facial diplegia, bulbar palsySensory: B/L distal UL and LL numbness, no objective sensory impairment and areflexia N/A N/A MV and IVIg PR
6 N/A 69/F Yes B/L same 1 12 days facial diplegia and bulbar palsy B/L distal UL and LL numbness, complete ophthalmoplegia leading to left Abducens nerve palsy CN: facial diplegia, bulbar palsy, complete ophthalmoplegia, Sensory: B/L UL and LL distal numbness, no objective sensory impairment and areflexia N/A N/A IVIg and Plasmapheresis PR
7 N/A 69/F Yes B/L same 1 13 days facial diplegia and bulbar palsy B/L UL and LL numbness and respiratory failure CN: facial diplegia, bulbar palsySensory: B/L UL and LL numbness, no objective sensory impairment and areflexia albuminocytological dissociation N/A MV and IVIg PR
7 Allen et al. Case series 4 1 None 54/M Yes B/L Oxford-Astrazeneca 1 16 days bifacial weakness distal dysesthesia in feet and hands DTR normal, no objective sensorimotor signs. Cerebellar, bulbar, extraocular movement and respiratory function normal. No dysautonomia
General exam: unremarkable
cell count: elevated; Protein: elevated MRI brain: unremarkable oral Prednisolone PR
2 ulcerative colitis 20/M Yes B/L same 1 26 days Bifacial weakness occipital headache, dysesthesia in distal LL neck movement uncomfortable, remainder of the neurological examination normal. DTR normal, no objective sensorimotor signs. Cerebellar, bulbar, extraocular movement and respiratory function normal. No dysautonomia
General exam: unremarkable
cell count: elevated; Protein: elevated MRI Brain: unremarkable oral Prednisolone PR
3 asthma and osteoarthritis with B/L knee replacement 57/M Yes B/L same 1 21 days bifacial weakness, dysarthria lumbar back pain that radiated to flanks, distal dysesthesia in feet, proximal leg weakness subjective diplopia on extreme left gaze, normal extraocular eye movements. Symmetric weakness proximally in legs. DTR absent at the knees but normal elsewhere. cell count: elevated; Protein: elevated Noncontrast MRI brain: unremarkable IVIg PR
4 HTN 55/M Yes B/L same 1 29 days facial diplegia B/L thigh paresthesias, sacral and lumbar numbness N/A albuminocytological dissociation MRI brain and whole spine with contrast: enhancement of the facial nerve None CR
8 Iftikhar et al. Case report 1 1 None 36/M No Left Moderna COVID-19 vaccine 2 1 day facial weakness left deltoid weakness, difficulty in speaking and eating, mild numbness and tingling of left arm, left subjective UL weakness N/A N/A CT and MRI brain: unremarkable oral Prednisolone and artificial tears PR
9 Bonifacio et al. LTE 5 1 N/A 66/M Yes B/L Oxford-Astrazeneca 1 17 days facial weakness, tongue and mouth numbness paraesthesia of hands and feet marked B/L LMN facial weakness. Tone, power and reflexes normal, but absent right ankle jerk. Light touch and pinprick sensation reduced symmetrically in B/L LL, gait ataxia albuminocytological dissociation MRI: unremarkable except for B/L smooth contrast enhancement along whole facial nerve IVIg PR
2 N/A 43/M Yes B/L same 1 17 days severe facial weakness, dysphagia, dysguesia, tongue paraesthesia myalgia, pins and needles in extremities, severe neck pain, urinary retention severe B/L LMN facial weakness. Limb tone normal, mild weakness in right hip flexion. Reflexes were later lost. Flexor planter responses, Patchy, asymmetrical glove and stocking reduction in pinprick sensation, sensory ataxia. cell count: elevated; Protein: elevated MRI: unremarkable except for B/L smooth contrast enhancement along whole facial nerve IVIg PR
3 N/A 51/M Yes Right, progessed to B/L same N/A 14 days facial weakness severe cramping leg pain, feet and hands numbness, spread to ankles complete B/L LMN facial weakness. Tone, power and reflexes normal. Sensation impaired in all limbs, sensory ataxia. albuminocytological dissociation MRI: unremarkable except B/L smooth contrast enhancement along whole facial nerve None PR
4 COVID-19 infection 5 weeks prior 71/F Yes B/L same N/A 15 days facial weakness and dysguesia lower back and abdominal pain, mild proximal leg weakness. severe B/L LMN facial weakness, slight B/L weakness in hip flexion. Absent knee and left ankle reflexes, normal sensory albuminocytological dissociation MRI: unremarkable None PR
5 N/A 53/M Yes B/L same N/A 14 days facial and perioral paraesthesia progressing to severe simultaneous B/L facial weakness lower back discomfort, radicular pain, LL parasthesia severe LMN B/L facial weakness, normal power elsewhere.
UL reflexes depressed; LL normal. Mild distal LL sensory loss to vibration and pinprick.
Albuminocytological dissociation CT: unremarkable None PR
10 Nasuelli et al. Case report 1 1 HTN and hyperuricemia 59/M Yes B/L Oxford-Astrazeneca 1 10 days facial diplegia, progressed to HB grade V four limb distal paraesthesia, postural instability physical exam: gait ataxia, global areflexia, distal UL and LL paraesthesia.
No CN, vegetative, or sphincter involvement
No spine sensory level.
albuminocytological dissociation Brain and cervical MRI: unremarkable IVIg and rehabilitation PR
11 Burrows et al. Case report 1 1 T2DM, HTN and hyperlipidemia 61/M No Right Pfizer-BioNTech 1 5 h right facial weakness N/A Right LMN facial palsy, lagophthalmos, no forehead movement N/A N/A Prednisolone CR
Left 2 2 days Severe left facial nerve palsy, dribbling and dysphagia N/A severe left facial nerve palsy HB grade IV, left lagophthalmos, SB grade 13,
remainder of neurological exam and gait normal
N/A N/A Prednisolone PR
12 Obermann et al. Case report 1 1 N/A 21/F No Right Pfizer-BioNTech 1 2 days facial muscle paralysis minimal muscle tenderness at injection site N/A unremarkable MRI: unremarkable oral Prednisolone, face muscle training, eye Protecting ointment and overnight eye patch. PR
13 McKean et al. Case report 1 1 dyslipidaemia 48/M Yes Left, progressed to B/L Oxford-Astrazeneca 1 10 days LMN facial weakness, initially HB grade III, progressed to grade V severe mid-thoracic back pain Progressive ascending paraesthesia, B/L LL weakness with foot drop, inability to bear weight, hand weakness and LL areflexia, impaired sensation to pain cell count: elevated; Protein: elevated MRI and CT brain: normal IVIg, oral Prednisolone and physiotherapy PR
14 Rossetti et al. Case report 1 1 anxiety, depression, drinker and drug addict 38/M Yes B/L J&J/Janssen COVID-19 vaccine 1 14 days facial weakness, tongue and lips numbness and tingling, dysarthria, difficulty drinking from a straw and controlling his lips, cheeks, and tongue while eating B/L hand and foot paresthesias general exam: headaches, mild gait unsteadiness, generalized fatigue, exertional dyspneadysarthria, B/L LMN facial weakness, mild lagophthalmos B/L, inability to smile or puff cheeks against resistance. DTR reduced albuminocytological dissociation MRI brain: focal enhancement of the B/L internal auditory canal fundi and B/L cisternal segments of the trigeminal nerves IVIg PR
15 Čenščák et al. Case report 1 1 bronchial asthma 42/M Yes Right Pfizer-BioNTech 1 25 days lagopthalmos hands and feet paraesthesia, unsteady gait, weak knees, lumbalgia right mimic muscle weakening and lagophthalmos up to 2
mm, handgrip and right arm elevation weak
reflexes C5-8 minimal,L2-S2 absent, slow movement in lower limbs, hypoesthesia 10 cm above the wrist, B/L vibration sense mildly weak takes 3–4 steps by leaning, knees buckling and ataxia
albuminocytological dissociation MRI LS spine with post-contrast: increased roots of cauda equina IVIg and rehabilitation PR
16 Prasad et al. Case report 1 1 morbidly obese 41/M Yes B/L J&J/Janssen COVID-19 vaccine 1 15 days left facial droop, difficulty eating, right facial weakness subjective weakness, distal paraesthesia, limb areflexia CN: B/L LMN facial nerve palsy, more prominent on the left. B/L DTR absent at the patella and Achilles, mute plantar responses albuminocytological dissociation CT and MRI brain: colloid cyst
MRI LS with contrast: thickening of cauda equina
IVIg and rehabilitation PR
17 Christensen et al. Case report 1 1 T2DM and Diabetic foot 73/M Yes B/L Moderna COVID-19 vaccine N/A 7 days tingling in tip of tongue and around mouth, progressive B/L facial paresis and dysarthria B/L sensory disturbances in LL, tingling in fingertips and dorsum of hands, left thoracic back pain radiating to the neck and jaw, could not walk reflexes weakened, sensory ataxia in lower extremities. unremarkable MRI: unremarkable None PR
18 Rutkove et al. Case report 1 1 None 58/M Yes B/L J&J/Janssen COVID-19 vaccine N/A 14 days facial weakness modest appendicular weakness, small
subarachnoid hemorrhages
N/A albuminocytological dissociation N/A N/A N/A
19 Mason et al. Case report 1 1 migraine headaches
alcohol: 3 drinks per week
35/F Yes Right, progessed to B/L Moderna COVID-19 vaccine N/A 28 days facial weakness and asymmetry, dysarthria, dysphagia, lagophthalmos occipital headaches, mild right arm weakness could not raise eyebrows, B/L lagophthalmos, unable to frown or smile. B/l N/Asolabial fold flattening, right handgrip weak
CRanial nerves, touch, vibration, reflexes normal
albuminocytological dissociation contrast MRI Brain and CT Angiography: unremarkable IV methylprednisolone and acyclovir PR
20 Corrêa et al. Case report 1 1 None 42/M Yes Left Oxford-Astrazeneca 1 7 days left otalgia, facial muscles weakness, forehead muscles paralysis, lagophthalmos and labial hypomobility None N/A unremarkable Brain MRI with gadolinium: enhanced canalicular and labyrinthine portions of the left facial nerve and left geniculate ganglion oral Prednisone CR
21 Oo et al. Case series 2 1 NSTEMI and seasonal influenza 51/M Yes B/L Oxford-Astrazeneca 1 14 days diplopia, dysphagia and bifacial weakness lower back pain, Respiratory failure, LL motor deficit, progressive ascending LL sensorimotor deficit and areflexia diplopia, bifacial weakness, moderate neck weakness, and flaccid areflexic quadriparesis with prominent proximal LL weakness.
Pinprick sensation was distally reduced on the right LL
albuminocytologic dissociation N/A IVIg, MV and plasmapheresis PR
2 Renal Cell Carcinoma
Atrial Fibrillation
Hypercholesterolemia
66/M Yes Right Oxford-Astrazeneca 1 21 days NA lower back pain, progressive ascending sensorimotor involvement
-proximal LL weakness
Peoximal paraparesis, prominent right facial LMN weakness, and areflexia Albuminocytologic dissociation N/A IVIg and rehabilitation PR
22 Yu et al. Case report 1 1 left Bell's palsy 36/F No Right Sinovac 1 2 days facial weakness and droop, eye discomfort, disappeared forehead wrinkles, lagophthalmos None CN: HB grade Ⅲ isolated right CN 7 palsy motor, sensory, and cerebellar examinations normal. N/A CT Brain: unremarkable Prednisone, artificial tears, fluorometholone eye drops and acupuncture therapy PR
23 Caro et al. LTE 1 1 N/A 50/M No left Pfizer-BioNTech 1 9 days facial droop and effacement of left Nasolabial fold tenderness at injection site. complete left facial paralysis, lagopthalmos, unable to raise eye brow or left labial fissure. N/A MRI: intra cranial space occupying lesions and ischemic changes Prednisone and articial tears.
24 Ish et al. LTE 1 1 None 50/M No Right Covaxine 2 7 days right lagopthalmos with redness and watering None Lagopthalmos with lower lid ectropion temporally. Drooping of angle of mouth, loss of nasolabial fold and wrinkiling of forehead. N/A N/A topical antibiotics, lubricating eye drops and oral prednisone
25 Karimi et al. Case series 5 1 None 38/M Yes Right, progessed to B/L Sputnik V 2 14 days B/L facial numbness and weakness numbness and parasthesias in distal UL B/L Facial palsy HB grade IV cell count: elevated; Protein: elevated MRI: unremarkable plasmapheresis
2 None 38/M Yes B/L Sputnik V 1 6 days B/L facial paralysis LL weakness, decreased B/L sensation up to ankles and areflexia with flexor plantar responses. B/L facial palsy HB grade IV and mild decreased LL light touch sensation and proprioception, distal to the ankle joints. Absent DTR cell count: elevated; Protein: elevated MRI brain and CS: few nonspecific B/L T2-hyperintensities viewed in the white matter plasmapheresis
3 HTN 48/F Yes B/L Sputnik V 1 17 days B/L facial paralysis generalized weakness with bulbar symptoms, dyspnea, and autonomic disorder. Absent DTR. N/A N/A Plasmapheresis and IVIg
4 HTN 44/M Yes B/L Oxford-Astrazeneca 1 14 days B/L facial numbness LL parasthesia and weakness flaccid tetraparesis cell count: elevated N/A IVIg
5 HTN/CABG 79/M Yes B/L Oxford-Astrazeneca 1 7 days B/L facial paralysis UL and LL parasthesia and weakness B/L Facial palsy HB grade IV with UL and LL weakness and DTR absent. N/A N/A Plasmapheresis
26 Kanabar et al. Case series 2 1 MS 61/F Yes B/L left > right. Oxford-Astrazeneca 1 10 days B/L LMN facial weakness (HB grade IV on the left and grade III on the right) LL weakness, decreased B/L sensation up to ankles N/A N/A N/A IVIg
2 N/A 56/M Yes B/L Oxford-Astrazeneca 1 7 days B/L facial paralysis severe back and LL radicular pain, LL numbness B/L LMN facial weakness (HB grade IV on the left and grade III on the right) and decreased vibration sensation at the ankles. Areflexic plantar response. N/A N/A IVIg
27 Cellina et al. Case report 1 1 N/A 35/F No left Moderna COVID-19 vaccine 1 12 h facial droop, dysphagia and lagophthalmos None slight asymmetry of the left corner of the mouth, N/A MRI:enhancement of left facial nerve. oral Prednisone
28 Walter et al. LTE 1 1 None 30/F No left Pfizer-BioNTech 2 2 months left facial paralysis ataxia left facial paralysis, discreet right CN XII paralysis and massive ataxia of all extremities Albuminocytological dissociation MRI brain: weak flair hyperintensity of the brainstem, mesencephalon and cerebellar around the fourth ventricle without contrast. MRI of cervical and thoracic spine: unremarkable IV cortisone with methylprednisolone
29 Li Dang et al. case report 1 1 N/A 63/M Yes B/L Oxford-Astrazeneca 1 14 days severe B/L facial weakness sensory ataxia, facial diplegia involving forehead, proximal LL weakness profound sensory ataxia, facial diplegia involving the forehead, proximal LL weakness, B/L LL areflexia and impaired distal LL proprioception, inability to walk without assistance and B/L lagophtalmos albuminocytoloigcal dissociation MRI contrast: B/L enhancement of CN III and CN VII, consistent with facial diplegia and partial B/L CN III palsy IVIg
30 Kharoubi et al. Case report 1 1 Smoker 42/M No Right Recommbinant vaccine 1 2 days right facial assymtery None peripheral facial paralysis (Charles-Bell positive) HB grade III N/A N/A Prednisone with eye care
31 Badoiu et al. LTE 1 1 N/A 53/F Yes B/L Oxford-Astrazeneca 1 13 days Asymmetric facial diplegia tetrameric distal paraesthesia, progressive limb weakness. mini mental motor deficit, hypopalasthesia, areflexia all 4 limbs, minimal ataxic gait. B/L latent blink reflex albumino-cytological dissociation MRI: unremarkable. plasmapheresis
32 Kulsirichawaroj et al. Case report 1 1 None 16/F No Right, progessed to B/L Pfizer-BioNTech 1 3 h right facial numbness and drooling, right lagophthalmous, aguesia and difficulty furrowing right eyebrow None right facial hypoesthesia, complete right facial palsy, reduced taste in anterior 2/3rd of mouth and absent right gag reflex N/A MRI brain and CN: abnormal enhancement of right CN VII IVIg
33 Kim et al. Case report 1 1 N/A 48/F No Left Oxford-Astrazeneca 1 14 days left facial paresis band like pain in chest. left facial paresis N/A N/A IVIg and Prednisolone
34 Mirmosayyeb et al. Case series 2 1 N/A 27/F No Left Sputnik V 1 5 days left lagophthalmous, rightward deviation of left upper lip and unable to drink with straw Pain at injection site and malaise. facial nerve hemiparalysis N/A N/A Prednisolone with valcyclovir
2 N/A 58/M No Left Sputnik V 1 10 days sudden left facial weakness and lagophthalmos, left mouth droop, drooling, aguesia, slurring of speech, tearing, inability to chew, smile, and move the left eyebrow hyperthermia, myalgia, and pain in the injection site. left facial paresis and lagopthalmos N/A N/A Prednisolone and valacyclovir
35 Mussatto et al. case report 1 1 HIV and CKD 60/M No Left Pfizer-BioNTech 1 42hrs left facial droop and left lagophthalmos NA left facial weakness with forehead involved, inability to raise left eyebrow, sensation and strength intact in B/L UL and LL, mild exposure keratopathy, 5 mm lagophthalmos N/A N/A oral Prednisone and valacyclovir
36 Andreozzi et al. Case series 2 1 Hashimoto thyroiditis 59/M No B/L Oxford-Astrazeneca 1 15 days B/L facial numbness acute spontaneous burning pain of lower back, LL paraesthesia complete facial diplegia and lagophtalmos: B/L loss of frontal forehead creases, could not raise eyebrows, and could not whistle or smile, mild dysarthria. albuminocytologic dissociation CT: unremarkable IVIg
2 Atrial fibrillation 43/M Yes B/L Oxford-Astrazeneca 1 7days subacute facial pain and numbness with lagophthalmos None left prevalent facial diplegia; symmetrical weakness MRC grade 4+ in distal UL and LL muscles albuminocytologic dissociation N/A IVIg
37 Loza et al. Case report 1 1 migraine 60/F Yes B/L J&J/Janssen COVID-19 vaccine 1 18 days B/L facial weakness and numbness back and leg pain, headache, nausea, vomiting, and diplopia Left eye esotropia, B/L ocular abduction deficit, areflexia and LL weakness cell count: elevated; Protein: elevated MRI LS:enhancement of cauda equina; Brain MRI:normal IVIg

Abbreviations: M, Male; F, Female; GBS, Guillian-Barre Syndrome; LTE, Letter to the Editor; CSF, Cerebrospinal fluid; N/A, Not Applicable; PR, Partial Recovery; CR, Complete Recovery; B/L, Bilateral; HTN, Hypertension, T2DM, Type 2 Insulin Independent Diabetes Mellitus; MRI, Magnetic Resonance Imaging; CT, Computed Tomography; LS, Lumbar Spine; CS, Cervical Spine; IVIg, Intravenous Immunoglobulin; IV, Intravenous; MV, Mechanical Ventilation; HB, House-Brackmann grading system; SB, Sunnybrook Facial Grading System; UL, Upper Limb; LL, Lower Limb; CN, Cranial Nerve; CN III, Occulomotor Nerve; CN VII, Facial Nerve, CN XII, Hypoglossal Nerve; LMN, Lower Motor Neuron; MS, Multiple Sclerosis; NSTEMI, Non ST Elevation Myocardial Infarction; CABG, Coronary Artery Bypass Graft; HIV, Human Immunodeficiency Virus; CKD, Chronic Kidney Disease; DTR, Deep Tendon Reflexes; J&J, Johnson & Johnson; MRC, Medical Research Council.