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Berli S, Barbagallo M, Keller E, Esposito G, Pagnamenta A, Brandi G. Sex-Related Differences in Mortality, Delayed Cerebral Ischemia, and Functional Outcomes in Patients with Aneurysmal Subarachnoid Hemorrhage: A Systematic Review and Meta-Analysis. J Clin Med 2024; 13:2781. [PMID: 38792323 PMCID: PMC11122382 DOI: 10.3390/jcm13102781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Revised: 04/30/2024] [Accepted: 05/06/2024] [Indexed: 05/26/2024] Open
Abstract
Background/Objective: Sex-related differences among patients with aneurysmal subarachnoid hemorrhage (aSAH) and their potential clinical implications have been insufficiently investigated. To address this knowledge gap, we conduct a comprehensive systematic review and meta-analysis. Methods: Sex-specific differences in patients with aSAH, including mortality, delayed cerebral ischemia (DCI), and functional outcomes were assessed. The functional outcome was dichotomized into favorable or unfavorable based on the modified Rankin Scale (mRS), Glasgow Outcome Scale (GOS), and Glasgow Outcome Scale Extended (GOSE). Results: Overall, 2823 studies were identified in EMBASE, MEDLINE, PubMed, and by manual search on 14 February 2024. After an initial assessment, 74 studies were included in the meta-analysis. In the analysis of mortality, including 18,534 aSAH patients, no statistically significant differences could be detected (risk ratio (RR) 0.99; 95% CI, 0.90-1.09; p = 0.91). In contrast, the risk analysis for DCI, including 23,864 aSAH patients, showed an 11% relative risk reduction in DCI in males versus females (RR, 0.89; 95% CI, 0.81-0.97; p = 0.01). The functional outcome analysis (favorable vs. unfavorable), including 7739 aSAH patients, showed a tendency towards better functional outcomes in men than women; however, this did not reach statistical significance (RR, 1.02; 95% CI, 0.98-1.07; p = 0.34). Conclusions: In conclusion, the available data suggest that sex/gender may play a significant role in the risk of DCI in patients with aSAH, emphasizing the need for sex-specific management strategies.
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Affiliation(s)
- Sarah Berli
- Faculty of Medicine, University of Zurich, 8032 Zurich, Switzerland
- Neurocritical Care Unit, Department of Neurosurgery, Institute for Intensive Care Medicine, University Hospital Zurich, 8091 Zurich, Switzerland
| | - Massimo Barbagallo
- Neurocritical Care Unit, Department of Neurosurgery, Institute for Intensive Care Medicine, University Hospital Zurich, 8091 Zurich, Switzerland
| | - Emanuela Keller
- Faculty of Medicine, University of Zurich, 8032 Zurich, Switzerland
- Neurocritical Care Unit, Department of Neurosurgery, Institute for Intensive Care Medicine, University Hospital Zurich, 8091 Zurich, Switzerland
- Clinical Neuroscience Center, University Hospital Zurich and University of Zurich, 8091 Zurich, Switzerland
| | - Giuseppe Esposito
- Clinical Neuroscience Center, University Hospital Zurich and University of Zurich, 8091 Zurich, Switzerland
- Department of Neurosurgery, University Hospital Zurich, 8091 Zurich, Switzerland
| | - Alberto Pagnamenta
- Clinical Trial Unit, Ente Ospedaliero Cantonale, 6900 Lugano, Switzerland
- Department of Intensive Care, Ente Ospedaliero Cantonale, 6900 Lugano, Switzerland
- Division of Pneumology, University of Geneva, 1211 Geneva, Switzerland
| | - Giovanna Brandi
- Faculty of Medicine, University of Zurich, 8032 Zurich, Switzerland
- Neurocritical Care Unit, Department of Neurosurgery, Institute for Intensive Care Medicine, University Hospital Zurich, 8091 Zurich, Switzerland
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Svedung Wettervik T, Hånell A, Ronne-Engström E, Lewén A, Enblad P. Temperature Changes in Poor-Grade Aneurysmal Subarachnoid Hemorrhage: Relation to Injury Pattern, Intracranial Pressure Dynamics, Cerebral Energy Metabolism, and Clinical Outcome. Neurocrit Care 2023; 39:145-154. [PMID: 36922474 PMCID: PMC10499919 DOI: 10.1007/s12028-023-01699-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 02/13/2023] [Indexed: 03/17/2023]
Abstract
BACKGROUND The aim was to study the course of body temperature in the acute phase of poor-grade aneurysmal subarachnoid hemorrhage (aSAH) in relation to the primary brain injury, cerebral physiology, and clinical outcome. METHODS In this observational study, 166 patients with aSAH treated at the neurosurgery department at Uppsala University Hospital in Sweden between 2008 and2018 with temperature, intracranial pressure (ICP), and microdialysis (MD) monitoring were included. The first 10 days were divided into the early phase (days 1-3) and the vasospasm phase (days 4-10). RESULTS Normothermia (temperature = 36-38 °C) was most prevalent in the early phase. A lower mean temperature at this stage was univariately associated with a worse primary brain injury, with higher Fisher grade and higher MD glycerol concentration, as well as a worse neurological recovery at 1 year. There was otherwise no association between temperature and cerebral physiological variables in the early phase. There was a transition toward an increased burden of hyperthermia (temperature > 38 °C) in the vasospasm phase. This was associated with concurrent infections but not with neurological or radiological injury severity at admission. Elevated temperature was associated with higher MD pyruvate concentration, lower rate of an MD pattern indicative of ischemia, and higher rate of poor neurological recovery at 1 year. There was otherwise no association between temperature and cerebral physiological variables in the vasospasm phase. The associations between temperature and clinical outcome did not hold true in multiple logistic regression analyses. CONCLUSIONS Spontaneously low temperature in the early phase reflected a worse primary brain injury and indicated a worse outcome prognosis. Hyperthermia was common in the vasospasm phase and was more related to infections than primary injury severity but also with a more favorable energy metabolic pattern with better substrate supply, possibly related to hyperemia.
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Affiliation(s)
- Teodor Svedung Wettervik
- Section of Neurosurgery, Department of Medical Sciences, Uppsala University, 751 85, Uppsala, Sweden.
| | - Anders Hånell
- Section of Neurosurgery, Department of Medical Sciences, Uppsala University, 751 85, Uppsala, Sweden
| | - Elisabeth Ronne-Engström
- Section of Neurosurgery, Department of Medical Sciences, Uppsala University, 751 85, Uppsala, Sweden
| | - Anders Lewén
- Section of Neurosurgery, Department of Medical Sciences, Uppsala University, 751 85, Uppsala, Sweden
| | - Per Enblad
- Section of Neurosurgery, Department of Medical Sciences, Uppsala University, 751 85, Uppsala, Sweden
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Chai CZ, Ho UC, Kuo LT. Systemic Inflammation after Aneurysmal Subarachnoid Hemorrhage. Int J Mol Sci 2023; 24:10943. [PMID: 37446118 DOI: 10.3390/ijms241310943] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 06/16/2023] [Accepted: 06/18/2023] [Indexed: 07/15/2023] Open
Abstract
Aneurysmal subarachnoid hemorrhage (aSAH) is one of the most severe neurological disorders, with a high mortality rate and severe disabling functional sequelae. Systemic inflammation following hemorrhagic stroke may play an important role in mediating intracranial and extracranial tissue damage. Previous studies showed that various systemic inflammatory biomarkers might be useful in predicting clinical outcomes. Anti-inflammatory treatment might be a promising therapeutic approach for improving the prognosis of patients with aSAH. This review summarizes the complicated interactions between the nervous system and the immune system.
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Affiliation(s)
- Chang-Zhang Chai
- Department of Medical Education, National Taiwan University, School of Medicine, Taipei 100, Taiwan
| | - Ue-Cheung Ho
- Division of Neurosurgery, Department of Surgery, National Taiwan University Hospital Yunlin Branch, Yunlin 640, Taiwan
| | - Lu-Ting Kuo
- Division of Neurosurgery, Department of Surgery, National Taiwan University Hospital Yunlin Branch, Yunlin 640, Taiwan
- Division of Neurosurgery, Department of Surgery, National Taiwan University Hospital, Taipei 100, Taiwan
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Zhang Z, Liu C, Zhou X, Zhang X. The Critical Role of Sirt1 in Subarachnoid Hemorrhages: Mechanism and Therapeutic Considerations. Brain Sci 2023; 13:brainsci13040674. [PMID: 37190639 DOI: 10.3390/brainsci13040674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 03/28/2023] [Accepted: 04/13/2023] [Indexed: 05/17/2023] Open
Abstract
The subarachnoid hemorrhage (SAH) is an important cause of death and long-term disability worldwide. As a nicotinamide adenine dinucleotide-dependent deacetylase, silent information regulator 1 (Sirt1) is a multipotent molecule involved in many pathophysiological processes. A growing number of studies have demonstrated that Sirt1 activation may exert positive effects on SAHs by regulating inflammation, oxidative stress, apoptosis, autophagy, and ferroptosis. Thus, Sirt1 agonists may serve as potential therapeutic drugs for SAHs. In this review, we summarized the current state of our knowledge on the relationship between Sirt1 and SAHs and provided an updated overview of the downstream molecules of Sirt1 in SAHs.
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Affiliation(s)
- Zhonghua Zhang
- Department of Neurosurgery, Jinling Hospital, Jinling School of Clinical Medicine, Nanjing Medical University, Nanjing 210029, China
| | - Cong Liu
- Department of Ophthalmology, Jinling Hospital, Jinling School of Clinical Medicine, Nanjing Medical University, Nanjing 210029, China
| | - Xiaoming Zhou
- Department of Neurosurgery, Jinling Hospital, Jinling School of Clinical Medicine, Nanjing Medical University, Nanjing 210029, China
| | - Xin Zhang
- Department of Neurosurgery, Jinling Hospital, Jinling School of Clinical Medicine, Nanjing Medical University, Nanjing 210029, China
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Alsbrook DL, Di Napoli M, Bhatia K, Desai M, Hinduja A, Rubinos CA, Mansueto G, Singh P, Domeniconi GG, Ikram A, Sabbagh SY, Divani AA. Pathophysiology of Early Brain Injury and Its Association with Delayed Cerebral Ischemia in Aneurysmal Subarachnoid Hemorrhage: A Review of Current Literature. J Clin Med 2023; 12:jcm12031015. [PMID: 36769660 PMCID: PMC9918117 DOI: 10.3390/jcm12031015] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/25/2023] [Accepted: 01/25/2023] [Indexed: 02/03/2023] Open
Abstract
Background: Delayed cerebral ischemia (DCI) is a common and serious complication of aneurysmal subarachnoid hemorrhage (aSAH). Though many clinical trials have looked at therapies for DCI and vasospasm in aSAH, along with reducing rebleeding risks, none have led to improving outcomes in this patient population. We present an up-to-date review of the pathophysiology of DCI and its association with early brain injury (EBI). Recent Findings: Recent studies have demonstrated that EBI, as opposed to delayed brain injury, is the main contributor to downstream pathophysiological mechanisms that play a role in the development of DCI. New predictive models, including advanced monitoring and neuroimaging techniques, can help detect EBI and improve the clinical management of aSAH patients. Summary: EBI, the severity of subarachnoid hemorrhage, and physiological/imaging markers can serve as indicators for potential early therapeutics in aSAH. The microcellular milieu and hemodynamic pathomechanisms should remain a focus of researchers and clinicians. With the advancement in understanding the pathophysiology of DCI, we are hopeful that we will make strides toward better outcomes for this unique patient population.
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Affiliation(s)
- Diana L Alsbrook
- Department of Neurology, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Mario Di Napoli
- Neurological Service, SS Annunziata Hospital, Sulmona, 67039 L'Aquila, Italy
| | - Kunal Bhatia
- Department of Neurology, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Masoom Desai
- Department of Neurology, University of New Mexico, Albuquerque, NM 87131, USA
| | - Archana Hinduja
- Department of Neurology, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA
| | - Clio A Rubinos
- Department of Neurology, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Gelsomina Mansueto
- Department of Advanced Medical and Surgical Sciences, University of Campania, 80138 Naples, Italy
| | - Puneetpal Singh
- Department of Human Genetics, Punjabi University, Patiala 147002, India
| | - Gustavo G Domeniconi
- Unidad de Cuidados Intensivos, Sanatorio de la Trinidad San Isidro, Buenos Aires 1640, Argentina
| | - Asad Ikram
- Stroke Division, Department of Neurology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA
| | - Sara Y Sabbagh
- Department of Neurology, University of New Mexico, Albuquerque, NM 87131, USA
| | - Afshin A Divani
- Department of Neurology, University of New Mexico, Albuquerque, NM 87131, USA
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Solar P, Joukal M, Silar C, Jancalek R. Impact of analgesic regimen on patient outcome following subarachnoid hemorrhage: positive adjuvant effects of metamizole. Br J Neurosurg 2022:1-8. [PMID: 36469604 DOI: 10.1080/02688697.2022.2151563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 10/24/2022] [Accepted: 11/20/2022] [Indexed: 12/12/2022]
Abstract
INTRODUCTION Various analgesics are used to control intense headaches in patients following subarachnoid hemorrhage. In addition to pain control, it has been shown that some analgesics can affect various pathophysiological cascades. Therefore, we devised a study to assess whether the use of metamizole has a significant impact on the development of ischemic complications, hydrocephalus, and the overall outcome in patients following aneurysmal subarachnoid hemorrhage in the context of the other non-opioids and opioids effects. METHODS In our retrospective, single-center cohort study, we enrolled 192 patients diagnosed with subarachnoid hemorrhage. We recorded their initial clinical status, comorbidities, and the daily dosage of analgesics over 14 days of hospitalization after the onset of subarachnoid hemorrhage. Using univariate and subsequent multivariate logistic regression analysis, we assessed the influence of various factors, including analgesics, on the development of delayed cerebral ischemia and hydrocephalus, as well as on 2-week and 6-month outcomes. RESULTS Although the administration of non-opioids, in general, had no effect on the development of delayed cerebral ischemia or hydrocephalus, the use of metamizole as the main analgesic was associated with a significantly lower chance of poor outcome at both 2-weeks and 6-months, as well as the development of delayed cerebral ischemia. As opioids were indicated primarily for analgosedation in mechanically ventilated patients with poor clinical status, their usage was associated with a significantly higher chance of poor outcome, delayed cerebral ischemia, and hydrocephalus. CONCLUSION Our results suggest that the prescription of metamizole may be associated with better outcomes and a lower chance of delayed cerebral ischemia development in patients after subarachnoid hemorrhage. Considering the retrospective nature of our study and the limited worldwide availability of metamizole due to its prohibition in some countries, our results do not demonstrate a clear benefit but rather justify the need for subsequent prospective studies.
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Affiliation(s)
- Peter Solar
- Department of Neurosurgery, St. Anne's University Hospital Brno, Brno, Czech Republic
- Department of Neurosurgery, Faculty of Medicine, St. Anne's University Hospital Brno, Masaryk University, Brno, Czech Republic
| | - Marek Joukal
- Department of Anatomy, Faculty of Medicine, Cellular and Molecular Neurobiology Research Group, Masaryk University, Brno, Czech Republic
| | - Cenek Silar
- Department of Neurosurgery, St. Anne's University Hospital Brno, Brno, Czech Republic
- Department of Neurosurgery, Faculty of Medicine, St. Anne's University Hospital Brno, Masaryk University, Brno, Czech Republic
| | - Radim Jancalek
- Department of Neurosurgery, St. Anne's University Hospital Brno, Brno, Czech Republic
- Department of Neurosurgery, Faculty of Medicine, St. Anne's University Hospital Brno, Masaryk University, Brno, Czech Republic
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Dowlati E, Mualem W, Carpenter A, Chang JJ, Felbaum DR, Sur S, Liu AH, Mai JC, Armonda RA. Early Fevers and Elevated Neutrophil-to-Lymphocyte Ratio are Associated with Repeat Endovascular Interventions for Cerebral Vasospasm in Patients with Aneurysmal Subarachnoid Hemorrhage. Neurocrit Care 2021; 36:916-926. [PMID: 34850332 DOI: 10.1007/s12028-021-01399-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Accepted: 11/09/2021] [Indexed: 12/19/2022]
Abstract
BACKGROUND Patients with aneurysmal subarachnoid hemorrhage (aSAH) may develop refractory arterial cerebral vasospasm requiring multiple endovascular interventions. The aim of our study is to evaluate variables associated with need for repeat endovascular treatments in refractory vasospasm and to identify differences in outcomes following one versus multiple treatments. METHODS We retrospectively reviewed patients treated for aSAH between 2017 and 2020 at two tertiary care centers. We included patients who underwent treatment (intraarterial infusion of vasodilatory agents or mechanical angioplasty) for radiographically diagnosed vasospasm in our analysis. Patients were divided into those who underwent single treatment versus those who underwent multiple endovascular treatments for vasospasm. RESULTS Of the total 418 patients with aSAH, 151 (45.9%) underwent endovascular intervention for vasospasm. Of 151 patients, 95 (62.9%) underwent a single treatment and 56 (37.1%) underwent two or more treatments. Patients were more likely to undergo multiple endovascular treatments if they had a Hunt-Hess score > 2 (odds ratio [OR] 5.10 [95% confidence interval (CI) 1.82-15.84]; p = 0.003), a neutrophil-to-lymphocyte ratio > 8.0 (OR 3.19 [95% CI 1.40-7.62]; p = 0.028), and more than two fevers within the first 5 days of admission (OR 7.03 [95% CI 2.68-20.94]; p < 0.001). Patients with multiple treatments had poorer outcomes, including increased length of stay, delayed cerebral ischemia, in-hospital complications, and higher modified Rankin scores at discharge. CONCLUSIONS A Hunt-Hess score > 2, a neutrophil-to-lymphocyte ratio > 8.0, and early fevers may be predictive of need for multiple endovascular interventions in refractory cerebral vasospasm after aSAH. These patients have poorer functional outcomes at discharge and higher rates of in-hospital complications.
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Affiliation(s)
- Ehsan Dowlati
- Department of Neurosurgery, MedStar Georgetown University Hospital, 3800 Reservoir Rd NW, PHC 7, Washington, DC, USA.
| | - William Mualem
- School of Medicine, Georgetown University, Washington, DC, USA
| | - Austin Carpenter
- Department of Neurosurgery, New York Medical College, Valhalla, NY, USA
| | - Jason J Chang
- Department of Critical Care Medicine, MedStar Washington Hospital Center, Washington, DC, USA
| | - Daniel R Felbaum
- Department of Neurosurgery, MedStar Georgetown University Hospital, 3800 Reservoir Rd NW, PHC 7, Washington, DC, USA.,Department of Neurosurgery, MedStar Washington Hospital Center, Washington, DC, USA
| | - Samir Sur
- Department of Neurosurgery, MedStar Georgetown University Hospital, 3800 Reservoir Rd NW, PHC 7, Washington, DC, USA.,Department of Neurosurgery, MedStar Washington Hospital Center, Washington, DC, USA
| | - Ai-Hsi Liu
- Department of Radiology, MedStar Washington Hospital Center, Washington, DC, USA
| | - Jeffrey C Mai
- Department of Neurosurgery, MedStar Georgetown University Hospital, 3800 Reservoir Rd NW, PHC 7, Washington, DC, USA.,Department of Neurosurgery, MedStar Washington Hospital Center, Washington, DC, USA
| | - Rocco A Armonda
- Department of Neurosurgery, MedStar Georgetown University Hospital, 3800 Reservoir Rd NW, PHC 7, Washington, DC, USA.,Department of Neurosurgery, MedStar Washington Hospital Center, Washington, DC, USA
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Mishra S, Garg K, Gaonkar VB, Singh PM, Singh M, Suri A, Chandra PS, Kale SS. Effects of Various Therapeutic Agents on Vasospasm and Functional Outcome After Aneurysmal Subarachnoid Hemorrhage-Results of a Network Meta-Analysis. World Neurosurg 2021; 155:41-53. [PMID: 34339892 DOI: 10.1016/j.wneu.2021.07.104] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2021] [Revised: 07/21/2021] [Accepted: 07/22/2021] [Indexed: 10/20/2022]
Abstract
BACKGROUND Vasospasm and delayed ischemic neurologic deficits are the leading causes of morbidity and mortality after aneurysmal subarachnoid hemorrhage (aSAH). Several therapeutic agents have been assessed in randomized controlled trials for their efficacy in reducing the incidence of vasospasm and improving functional outcome. The aim of this network meta-analysis is to compare all these therapeutic agents for their effect on functional outcome and other parameters after aSAH. METHODS A comprehensive search of different databases was performed to retrieve randomized controlled trials describing the effect of various therapeutic approaches on functional outcome and other parameters after aSAH. RESULTS Ninety-two articles were selected for full text review and 57 articles were selected for the final analysis. Nicardipine prolonged-release implants were found to be the best treatment in terms of favorable outcome (odds ratio [OR], 8.55; 95% credible interval [CrI], 1.63-56.71), decreasing mortality (OR, 0.08; 95% CrI, 0-0.82), and preventing angiographic vasospasm (OR, 0.018; 95% CrI, 0.00057-0.16). Cilostazol was found to be the second-best treatment in improving favorable outcomes (OR, 3.58; 95% CrI, 1.97-6.57) and decreasing mortality (OR, 0.41; 95% CrI, 0.12-1.15). Fasudil (OR, 0.16; 95% CrI, 0.03-0.78) was found to be the best treatment in decreasing increased vessel velocity and enoxaparin (OR, 0.25; 95% CrI, 0.057-1.0) in preventing delayed ischemic neurologic deficits. CONCLUSIONS Our analysis showed that nicardipine prolonged-release implants and cilostazol were associated with the best chance of improving favorable outcome and mortality in patients with aSAH. However, larger multicentric studies from other parts of the world are required to confirm these findings.
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Affiliation(s)
- Sandeep Mishra
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, Delhi, India
| | - Kanwaljeet Garg
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, Delhi, India.
| | - Vishwa Bharathi Gaonkar
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, Delhi, India
| | - Preet Mohinder Singh
- Department of Anesthesia, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Manmohan Singh
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, Delhi, India
| | - Ashish Suri
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, Delhi, India
| | - P Sarat Chandra
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, Delhi, India
| | - Shashank Sharad Kale
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi, Delhi, India
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