Bacterial Brain Abscess and Life-Threatening Intracranial Hypertension Requiring Emergent Decompressive Craniectomy After SARS-CoV-2 Infection in a Healthy Adolescent.

Acute coronavirus 2 (SARS-CoV-2) infection usually results in mild symptoms, but secondary infections after SARS-CoV-2 infection can occur, particularly with comorbid conditions. We present the clinical course of a healthy adolescent with a brain abscess and life-threatening intracranial hypertension requiring emergent decompressive craniectomy after a SARS-CoV-2 infection. A 13-year-old healthy immunized male presented with invasive frontal, ethmoid, and maxillary sinusitis and symptoms of lethargy, nausea, headache, and photophobia due to a frontal brain abscess diagnosed three weeks after symptoms and 11 days of oral amoxicillin treatment. Coronavirus disease 2019 (COVID-19) reverse transcription-polymerase chain reaction (RT-PCR) was negative twice but then positive on amoxicillin day 11 (symptom day 21), when magnetic resonance imaging revealed a 2.5-cm right frontal brain abscess with a 10-mm midline shift. The patient underwent emergent craniotomy for right frontal epidural abscess washout and functional endoscopic sinus surgery with ethmoidectomy. On a postoperative day one, his neurological condition showed new right-sided pupillary dilation and decreased responsiveness. His vital signs showed bradycardia and systolic hypertension. He underwent an emergent decompressive craniectomy for signs of brain herniation. Bacterial PCR was positive for Streptococcus intermedius, for which he received intravenous vancomycin and metronidazole. He was discharged home on hospital day 14 without neurological sequelae and future bone flap replacement. Our case highlights the importance of timely recognition and treatment of brain abscess and brain herniation in patients with neurological symptoms after SARS-CoV-2 infection, even in otherwise healthy patients.

Does prolonged prone position affect intracranial pressure? prospective observational study employing Optic nerve sheath diameter measurements.

BACKGROUND: Our aim in this observational prospective study is to determine whether the prone position has an effect on intracranial pressure, by performing ultrasound-guided ONSD (Optic Nerve Sheath Diameter) measurements in patients with acute respiratory distress syndrome (ARDS) ventilated in the prone position. METHODS: Patients hospitalized in the intensive care unit with a diagnosis of ARDS who were placed in the prone position for 24 h during their treatment were included in the study. Standardized sedation and neuromuscular blockade were applied to all patients in the prone position. Mechanical ventilation settings were standardized. Demographic data and patients' pCO2, pO2, PaO2/FiO2, SpO2, right and left ONSD data, and complications were recorded at certain times over 24 h. RESULTS: The evaluation of 24-hour prone-position data of patients with ARDS showed no significant increase in ONSD. There was no significant difference in pCO2 values either. PaO2/FiO2 and pO2 values demonstrated significant cumulative increases at all times. Post-prone SPO2 values at the 8th hour and later were significantly higher when compared to baseline (p < 0.001). CONCLUSION: As a result of this study, it appears that the prone position does not increase intracranial pressure during the first 24 h and can be safely utilized, given the administration of appropriate sedation, neuromuscular blockade, and mechanical ventilation strategy. ONSD measurements may increase the safety of monitoring in patients ventilated in the prone position.

The UK CSF Disorders Day 2022.

The annual United Kingdom cerebrospinal fluid disorders meeting made its return to the University of Birmingham, United Kingdom, following the break in proceedings due to the coronavirus pandemic. Cerebrospinal fluid disorders require a multi-disciplinary approach with inputs from the neurological, neuro-ophthalmological, neuroradiological, and neurosurgical specialities. The annual meeting presented the newest concepts underpinning idiopathic intracranial hypertension pathophysiology and the advances in intracranial pressure monitoring and treatment.

[Ocular symptoms in cerebellitis caused by COVID-19 : Cerebellitis, a less noticed disease with neuro-ophthalmological findings]. / Augensymptome bei Cerebellitis durch COVID-19 : Cerebellitis, eine wenig beachtete Krankheit mit neuroophthalmologischen Befunden.

The disease pattern of acute cerebellitis has been increasingly noticed in recent years. Two different courses had been observed. A mild form with slight ataxic disorders (as a postinfectious self-limiting disease) and a fulminant course of cerebellitis with cerebellar swelling, which compresses Sylvius' aqueduct, leading to an increased intracranial pressure with an obstructive hydrocephalus, and downward herniation of the cerebellar tonsils in the foramen magnum. In this case the course can be fatal if neurosurgical emergency treatment comes too late. Cerebellitis has been observed as a sequela to a virus infection and by autoimmune-mediated inflammation. Numerous publications were concerned with childhood cerebellitis but less commonly in adults. Neuro-ophthalmological findings were frequently described as nystagmus (horizontal gaze-evoked nystagmus, vertical nystagmus, downbeat nystagmus, periodic alternating nystagmus), papilledema, more rarely paresis of the abducens or facial nerve, photophobia and very rarely an opsoclonous-myoclonous syndrome. Cerebellitis with neuro-ophthalmological findings has repeatedly been described in adults during the coronavirus disease 2019 (COVID-19) pandemic.

Measurement of Optic Nerve Sheath Diameter by Trans-Orbital Ultrasound to Detect Raised Intracranial Pressure in Children

Aims Raised Intracranial Pressure (ICP) is frequently encountered condition amongst children due to neurological and non-neurological etiologies. It contributes towards 20% of the admissions in our PICU at tertiary care institute of North India. Timely diagnosis of raised intracranial pressure is critical for appropriate management. Ultrasonographic measurement of optic nerve sheath diameter (ONSD) is non-invasive point of care tool to recognize raised intracranial pressure however there are very limited studies in pediatric population on this. Aim of this study was to measure the ONSD of children admitted in pediatric intensive care unit (PICU) to identify the difference in ONSD among the pediatric patients with normal and raised ICP and to achieve the cut-off value for diagnosing raised ICP. Methods A Hospital based observational comparative study conducted at PICU of a tertiary care institute of national importance in North India. ONSD measurement of all the patients aged 2-14 years admitted in pediatrics department for >48 hours was done in two phases due to COVID-19 related restrictions in routine admissions for some months. First phase was from 1st January 2020 to 31st March 2021 and second phase started from 15th January 2022. Complete enumeration technique was used for the study. Children receiving treatment for raised ICP based on clinical features (Muir's criteria) and neuroimaging were included in raised ICP group and they were compared with the patients without any signs of raised ICP. Optic nerve sheath diameter was measured in both the groups on Day 1 (i.e. within 24 hours of admission) and Day 2 of admission. Third and last ONSD measurement was done on any day between day 4 and day 7 of admission. On each day, 3 readings were taken from each eye and average of 3 readings was used for final statistical analysis for that particular day. Treating team was unaware of the USG findings throughout the stay of the patient in the department. Results Total 101 patients recruited, among them 16 patients had raised ICP and 85 patients had normal ICP. The mean optic nerve sheath diameter on day 1 was found to be higher in the patients with raised ICP (Mean ONSD = 4.955 +/- 0.80) as compared to those with normal ICP (Mean ONSD = 4.05 +/- 0.43). Their mean difference was 0.90 mm (95% CI 0.07-1.48 p value <0.01). Mean ONSD on day 2 also was higher in raised ICP patients (Mean ONSD = 4.82 +/- 0.73) in comparison to normal ICP patients (Mean ONSD = 4.06 +/- 0.47) which was statistically significant (p value = 0.001). The cut-off ONSD value for detecting the raised ICP was estimated to be 4.35 mm on ROC curve with area under the curve 0.862 (95% CI, 0.721-0.943), sensitivity of 75% and specificity of 76.5%. Conclusion Raised ICP is one of the important neurological entities in children contributing towards significant morbidity. Measurement of ONSD by trans-orbital ultrasound was able to detect raised ICP with excellent discriminatory performance.

Cryptococcus Infection in an Immunocompetent Patient.

Cryptococcal meningitis is a fungal infection of the CNS, generally thought of as an opportunistic infection in those with T-cell immunodeficiencies including AIDS (usually with a CD4 count of less than 100), chronic steroid use, hematological malignancies, and transplant recipients. It can have irreversible CNS morbidity, including vision loss, intracranial hypertension, and cognitive decline. Diagnosis depends on cerebrospinal fluid (CSF) analysis, in which cultures and cryptococcal antigen are most sensitive. CSF PCR can also be done. Most patients have disseminated disease, and blood cultures are also positive. Outcomes remain guarded, with a poor prognosis (morbidity and high mortality) among survivors. This article presents a case of cryptococcal meningitis in an immunocompetent individual, where absolutely no identifiable risk factor was present.

A computational study of metal ions interaction with amyloid-ß 1-42 peptide structure in hyperpyrexia: Implications for Alzheimer disease.

Given the current context of the SARS-CoV-19 pandemic, among the interfering risky factors with the Aß peptide aggregation in the brains of Alzheimer's disease (AD) patients can be hyperpyrexia and increased intracranial pressure (ICP). According to our hypothesis on the relationship between hyperpyrexia and cognitive decline in AD, two models of Aß peptides were used in this study: the structure of AD amyloid beta-peptide and near-atomic resolution fibril structures of the Aß peptide. Therefore, the binding templates were constructed for Aß peptide regions able to bind 9 different metal ions. The fragment transformation method was used for the structural comparison between Aß chains. Molecular dynamics simulation (MDS) was applied using the Nose-Poincare-Anderson equation to generate a theoretically correct NPT (isothermal-isobaric ensemble). The smallest dissimilarities were observed in the case of Cu+ binding potential followed by Co2+, both with similar variation. Structural changes have also occurred as a result of the dynamic simulation. All these changes suggest an aggravating factor in both hyperpyretic and AD conditions. Our findings suggest that elevated temperature and increased intracranial pressure rise the effect of peptide aggregation, by converting α-helix motif to ß-sheet and random coil conformation, which are related to the formation of senile plaques in AD brains.

Kratom-induced Liver Failure and Death: A Case Report

Introduction: Kratom (mitragynine speciosa) is a tree native to Southeast Asia that has both opioid, stimulant, and other unknown properties. It is currently legal in the United States and used for therapeutic and recreational purposes. There is a dearth of literature on kratom’s effects on the body. At least half of reported kratom exposures resulted in a serious medical outcome, including death (1). In contrast, there are no controlled clinical trials on safety and efficacy of kratom as a treatment (2). Case: A 32-year-old Caucasian, currently unemployed, unmarried, mother of two children presented intubated to the MICU from an outside hospital with acute fulminant hepatic failure in the setting of significant kratom use. The patient also presented febrile with intracranial hemorrhage, cerebral edema, GI bleeding, acute renal failure, and diffuse intravascular coagulation. Psychiatry was consulted for potential liver transplant candidacy. Her previous history included six years of opioid use and transition to kratom 1-2 years prior to admission, with recent ingestion up to twenty-five times the patient’s usual amount (up to 125mg). Pertinent positive labs included elevated troponin (0.4), transaminitis ( >11,000), elevated PT/PTT (99/52), D-dimer ( >20), hematuria, pyuria, serum ferritin, prolonged QTc (514), and hypoglycemia. Pertinent negatives included unrevealing serum ethanol, phosphatidylethanol, viral hepatitis, HIV, COVID-19, EBV, CMV, other viral panels, acetaminophen level, toxicology screen, and EEG. Imaging revealed interstitial pulmonary edema and diffuse cerebral edema. Given lack of published information on kratom, the team emergently listed the patient for liver transplant despite significant concern for kratom use disorder. Over the course of three days, the patient’s mental status and labs continued to worsen, ultimately resulting in death. Interventions pursued included dialysis, mechanical ventilation, intracranial pressure monitoring with pressure optimization, anticonvulsant therapy, antibiotic therapy, N-acetylcysteine, and other routine MICU care. Due to relatively unremarkable health before ingestion, lack of other significant events, and severe rapid decline, multidisciplinary team consensus cause of death was due to kratom ingestion causing “acute liver failure with hepatic coma”. Discussion: This case report will go into further detail on kratom by analyzing kratom’s mechanism of action, therapeutic use, known side effects including addictive potential, effects on the liver including acute fulminant injury, and current laws and regulations surrounding kratom in the United States with relevance to public health. This is relevant to psychiatrists in the general consult, transplant, and addictions services. References: 1. Post S, Spiller HA, Chounthirath T, Smith GA. Kratom exposures reported to United States poison control centers: 2011–2017. Clinical Toxicology. 2019 57:10,847-854. DOI:10.1080/15563650.2019.1569236 2. Prozialeck W. Update on the Pharmacology and Legal Status of Kratom. J of the AOA. 2016, 116, 802-809. DOI: https://doi.org/10.7556/jaoa.2016.156

Intraparenchymal fiberoptic intracranial pressure monitoring and decompressive craniectomy in meningioma case with critical intracranial pressure: A case report during COVID-19 pandemic.

Introduction: Meningioma is a slow-growing tumor that can cause neurological emergency due to intracranial hypertension. The definitive therapy is indeed emergency resection, but it is not always possible in several countries due to limited capacity and/or capability of the emergency operating room. The use of intraparenchymal fiberoptic intracranial pressure (ICP) monitoring and decompressive craniectomy (DC) in cases of brain tumors might be possible, but it is uncommon. We report a meningioma patient in whom immediate meningioma resection was considered too risky due to intensive care unit (ICU) shortage during COVID-19 pandemic and, therefore, underwent these procedures as life-saving measures. Case presentation: A 24-year-old man was brought to the emergency room with a chief complaint of seizure. Physical examination was notable for decreased consciousness (Glasgow Coma Scale (GCS) 11) and a dilated left pupil with intact light reflex. A contrasted Brain CT Scan revealed extra-axial mass on the left sphenoid with extensive tentacle edema, which pushed the midline structures 2 cm toward the contralateral side. Discussion: The patient was diagnosed with Left Sphenoid Meningioma. We decided to perform intraparenchymal fiberoptic ICP monitor insertion and DC considering the situation, device availability, safety, and efficacy. The patient slowly regained consciousness in the recovery room after the procedure. The best-observed GCS was 12. Two weeks afterward, the patient came back to our outpatient clinic neurologically intact. The patient was then planned for elective tumor resection. Conclusion: ICP monitoring and DC are not commonly performed on brain tumor cases. However, in suboptimal situations, these procedures might save lives. The present case showed that ICP monitor and DC were helpful in times of ICU shortage.

Abstracts from International Emergency Medicine Journals

Editor’s note: EMJ has partnered with the journals of multiple international emergency medicine societies to share from each a highlighted research study, as selected by their editors. This edition will feature an from each publication.

Pediatric Multi-System Inflammatory Syndrome With Fatal Cerebral Edema in a Patient With COVID-19

INTRODUCTION: There are increasing reports of a pediatric multisystem inflammatory syndrome associated with coronavirus disease 2019 (COVID-19) that presents with varying clinical features, but includes features of Kawasaki disease or toxic shock syndrome. Symptoms include fever, rash, abdominal pain, vomiting, and diarrhea. Many patients present without any respiratory symptoms and testing for SARS-CoV-2 is often negative. METHODS: A retrospective chart review was performed. RESULTS: A 7-year-old previously healthy male presented with 3 days of fevers up to 102.4F, headaches, abdominal pain, and intractable vomiting. Both parents had tested positive for SARS-CoV-2 four weeks prior. Nasopharyngeal swab tested positive for SARS-CoV-2 RNA. Echocardiogram was normal. CT venogram of his head was negative for any pathology. He developed severe neck pain and persistent headache during his hospitalization. Soon after receiving hydroxychloroquine, he developed a facial rash and altered mental status with episodes of aphasia, agitation, and pinpoint pupils. He then became unresponsive with left gaze deviation. A non-contrast head CT and CT angiography were negative. He was given levetiracetam and cefazolin and transferred to the pediatric intensive care unit. An electroencephalogram (EEG) showed no epileptiform activity. Over the following 7 hours, the EEG demonstrated left frontotemporal slowing, which progressed into a loss of fast activity over the right hemisphere with increased delta activity in the left hemisphere, then abruptly changed to generalized voltage attenuation.He rapidly lost brainstem reflexes, developing fixed and dilated pupils. Repeat CT scan revealed diffuse cerebral edema with loss of gray-white differentiation. Lab results then were consistent with severe inflammation. An intracranial pressure monitor revealed pressures greater than 76 mmHg. His exam soon became consistent with brain death. Pathologic evaluation showed diffuse cerebral edema with perivascular mononuclear infiltrates. CONCLUSION: The cause of this pediatric multi-system inflammatory syndrome is unclear and the mechanism by which SARS-CoV-2 affects the nervous system is unknown. Pediatric patients with COVID-19 and neurologic symptoms should be closely monitored as they can rapidly decline due to fulminant cerebral edema.

COVID 19 RELATED ACUTE NECROTIZING ENCEPHALOPATHY COMPLICATED WITH PITUITARY APOPLEXY

Background: Severe Acute Respiratory Syndrome Corona Virus 2(SARS-Cov2) is well known to cause a multitude of neurologic conditions out of which remains the rather rare condition of Acute Necrotizing Encephalopathy. It's a devastating condition with early immunotherapy bringing a more favorable outcome. Pathophysiology suggests the dysregulation of the blood brain barrier secondary to the cytokine storm. Pituitary apoplexy is an unrelated acute condition in which there is either hemorrhagic or non- hemorrhagic necrosis of the pituitary gland. It again has multiple predisposing factors including changes in intracranial pressure and underlying coagulation disorders. Case Presentation: A thirty-five-year-old male patient with poorly controlled diabetes presented to our emergency department with fever, cough and progressive respiratory distress for three days. He was drowsy with clinical features of bronchopneumonia and his COVID PCR was positive (He had taken only the first dose of Sinopharm nearly a month before). Within twenty-four hours, he was sent to the ICU for ventilatory support mainly due to low GCS. His HRCT Chest revealed severe COVID pneumonia. MRI brain revealed high signal intensities involving cerebellum, brainstem, bilateral thalami and mesial temporal lobes compatible with acute necrotizing encephalopathy with a pituitary macroadenoma and bleeding into it. He received high dose steroids followed by plasma exchange leading to resolution of the above changes within a month but passed away at the end of six weeks due to secondary bacterial sepsis. Discussion: Here the pituitary macroadema was an incidental finding and the bleeding was postulated to be secondary to changes in intra cranial pressure. Both the Necrotizing encephalopathy and the pituitary apoplexy might have resulted in the reduced conscious level in the above patient in the background of severe COVID pneumonia. The immunotherapy was successful in resolution of the radiologic changes though the patient deteriorated clinically following a transient improvement due to bacterial sepsis.

Intracranial Pressure Dynamics and Cerebral Vasomotor Reactivity in Coronavirus Disease 2019 Patient With Acute Encephalitis.

We describe the intracranial pressure dynamics and cerebral vasomotor reactivity in a coronavirus disease 2019 patient with acute encephalitis treated with cerebrospinal fluid drainage and therapeutic plasma exchange. DATA SOURCES: Coronavirus disease ICU, Uppsala University Hospital, Sweden. STUDY SELECTION: Case report. DATA EXTRACTION: Radiology, intracranial pressure, intracranial compliance (correlation between intracranial pressure amplitude and mean intracranial pressure), cerebral vasomotor reactivity (pressure reactivity index), arterial blood pressure, cerebrospinal fluid chemistry, and treatment. DATA SYNTHESIS: None. CONCLUSIONS: This is the first reported case of intracranial pressure monitoring in a patient with acute encephalitis following coronavirus disease 2019. Intracranial pressure data exhibited a high incidence of plateau waves with intracranial pressure insults above 40 mm Hg that required cerebrospinal fluid drainage. Intracranial compliance was low, and pressure reactivity was intact. It is probable that the combination of low intracranial compliance and intact pressure autoregulation explain the high degree of plateau intracranial pressure waves and intracranial pressure variability. This case illustrates that it could be of value to consider intracranial pressure monitoring in selected coronavirus disease 2019 patients with suspicion of increased intracranial pressure to be able to confirm and treat intracranial hypertension if needed. In this patient, therapeutic plasma exchange was safe and efficacious as the level of neuroinflammation decreased and the patient regained consciousness.

Optic nerve sheath diameter measurement by ultrasound: Evaluation of a standardized protocol.

BACKGROUND AND PURPOSE: Treatment of elevated intracranial pressure (ICP) is central to neurocritical care, but not all patients are eligible for invasive ICP-monitoring. A promising noninvasive option is ultrasound measurement of the optic nerve sheath diameter (ONSD). However, meta-analyses of ONSD for elevated ICP show wide confidence intervals. This might be due to baseline variations, inter-rater variability, and varying measurement methods. No standardized protocol has been validated. Corrections for eyeball diameter (ED) and optic nerve diameter (OND) may compensate for baseline variations. We evaluated a protocol and compared two different measurement methods for ONSD ultrasound. METHODS: Two operators, blinded to each other's measurements, measured ONSD, ED, and OND twice in 20 patients. ONSD was measured with two different methods in use: internal (ONSDint) or external (ONSDext) of the dura mater. Intra-class correlation (ICC) was calculated for inter-rater and intra-rater reliability. RESULTS: ICCs for inter-rater reliability of ONSDext and ONSDint (95% confidence interval) were 0.96 (0.93, 0.98) and 0.88 (0.79, 0.94), respectively. ICCs for intra-rater reliability of ONSDext and ONSDint were 0.97 (0.94, 0.99) and 0.93 (0.87, 0.96), respectively. There was no significant bias or difference in intra-rater reliability between operators. CONCLUSIONS: ONSD can be measured with an excellent inter- and intra-rater reliability and low risk of inter-rater bias, when using this protocol. ONSDext yields a higher inter- and intra-rater reliability than ONSDint. Corrections for ED and OND can be performed reliably.

A Novel Noninvasive Technique for Intracranial Pressure Waveform Monitoring in Critical Care.

BACKGROUND: We validated a new noninvasive tool (B4C) to assess intracranial pressure waveform (ICPW) morphology in a set of neurocritical patients, correlating the data with ICPW obtained from invasive catheter monitoring. MATERIALS AND METHODS: Patients undergoing invasive intracranial pressure (ICP) monitoring were consecutively evaluated using the B4C sensor. Ultrasound-guided manual internal jugular vein (IJV) compression was performed to elevate ICP from the baseline. ICP values, amplitudes, and time intervals (P2/P1 ratio and time-to-peak [TTP]) between the ICP and B4C waveform peaks were analyzed. RESULTS: Among 41 patients, the main causes for ICP monitoring included traumatic brain injury, subarachnoid hemorrhage, and stroke. Bland-Altman's plot indicated agreement between the ICPW parameters obtained using both techniques. The strongest Pearson's correlation for P2/P1 and TTP was observed among patients with no cranial damage (r = 0.72 and 0.85, respectively) to the detriment of those who have undergone craniotomies or craniectomies. P2/P1 values of 1 were equivalent between the two techniques (area under the receiver operator curve [AUROC], 0.9) whereas B4C cut-off 1.2 was predictive of intracranial hypertension (AUROC 0.9, p < 000.1 for ICP > 20 mmHg). CONCLUSION: B4C provided biometric amplitude ratios correlated with ICPW variation morphology and is useful for noninvasive critical care monitoring.

COVID-19-related diffuse leukoencephalopathy with microbleeds and persistent coma: a case report with good clinical outcome.

A 60-year-old patient presented with respiratory distress, after recently being tested COVID-19 positive and was mechanically ventilated for 15 days. After cessation of sedation, he remained in deep comatose state, without any reaction on pain stimuli (Glasgow Coma Score 3). MRI of the brain showed diffuse leukoencephalopathy and multiple (>50) microbleeds. Diffuse COVID-19-associated leukoencephalopathy with microhaemorrhages is associated with a poor prognosis. However, 3 months later, our patient showed a remarkable recovery and was able to walk independently. This case report shows COVID-related leukoencephalopathy and intracerebral microbleeds, even with persistent comatose state, may have a favourable clinical outcome and prolonged treatment should be considered in individual cases.

Cerebral deep venous thrombosis and COVID-19: case report.

Herein, the authors present the case of a 54-year-old male diagnosed with coronavirus disease 2019 (COVID-19) during a screening test. The patient was asked to self-isolate at home and report with any exacerbations of symptoms. He presented later with pneumonia complicated by encephalopathy at days 14 and 15 from initial diagnosis, respectively. MRI of the brain showed bithalamic and gangliocapsular FLAIR signal abnormality with mild right-sided thalamic and periventricular diffusion restriction. A CT venogram was obtained given the distribution of edema and demonstrated deep venous thrombosis involving the bilateral internal cerebral veins and the vein of Galen. CSF workup was negative for encephalitis, as the COVID-19 polymerase chain reaction (PCR) test and bacterial cultures were negative. A complete hypercoagulable workup was negative, and the venous thrombosis was attributed to a hypercoagulable state induced by COVID-19. The mental decline was attributed to bithalamic and gangliocapsular venous infarction secondary to deep venous thrombosis. Unfortunately, the patient's condition continued to decline, and care was withdrawn.

Cerebral Hemodynamics and Intracranial Compliance Impairment in Critically Ill COVID-19 Patients: A Pilot Study.

Introduction: One of the possible mechanisms by which the new coronavirus (SARS-Cov2) could induce brain damage is the impairment of cerebrovascular hemodynamics (CVH) and intracranial compliance (ICC) due to the elevation of intracranial pressure (ICP). The main objective of this study was to assess the presence of CVH and ICC alterations in patients with COVID-19 and evaluate their association with short-term clinical outcomes. Methods: Fifty consecutive critically ill COVID-19 patients were studied with transcranial Doppler (TCD) and non-invasive monitoring of ICC. Subjects were included upon ICU admission; CVH was evaluated using mean flow velocities in the middle cerebral arteries (mCBFV), pulsatility index (PI), and estimated cerebral perfusion pressure (eCPP), while ICC was assessed by using the P2/P1 ratio of the non-invasive ICP curve. A CVH/ICC score was computed using all these variables. The primary composite outcome was unsuccessful in weaning from respiratory support or death on day 7 (defined as UO). Results: At the first assessment (n = 50), only the P2/P1 ratio (median 1.20 [IQRs 1.00-1.28] vs. 1.00 [0.88-1.16]; p = 0.03) and eICP (14 [11-25] vs. 11 [7-15] mmHg; p = 0.01) were significantly higher among patients with an unfavorable outcome (UO) than others. Patients with UO had a significantly higher CVH/ICC score (9 [8-12] vs. 6 [5-7]; p < 0.001) than those with a favorable outcome; the area under the receiver operating curve (AUROC) for CVH/ICC score to predict UO was 0.86 (95% CIs 0.75-0.97); a score > 8.5 had 63 (46-77)% sensitivity and 87 (62-97)% specificity to predict UO. For those patients undergoing a second assessment (n = 29), after a median of 11 (5-31) days, all measured variables were similar between the two time-points. No differences in the measured variables between ICU non-survivors (n = 30) and survivors were observed. Conclusions: ICC impairment and CVH disturbances are often present in COVID-19 severe illness and could accurately predict an early poor outcome.