Publications

2020

Melgar, Mario, Tea Reljic, Guillermo Barahona, Kattia Camacho, Alicia Chang, Johanny Contreras, Darrell Espinoza, et al. (2020) 2020. “Guidance Statement for the Management of Febrile Neutropenia in Pediatric Patients Receiving Cancer-Directed Therapy in Central America and the Caribbean.”. JCO Global Oncology 6: 508-17. https://doi.org/10.1200/JGO.19.00329.

PURPOSE: Our objective was to provide regionally appropriate, resource-conscious recommendations for the diagnosis and treatment of pediatric patients with febrile neutropenia.

METHODS: A multinational panel of Central American and Caribbean clinicians who deliver pediatric oncology care prioritized clinically important questions and then used the Grading of Recommendations Assessment, Development and Evaluation methodology to provide recommendations on the selected topics.

RESULTS: Twenty-two questions and 2 definitions were included in the guideline, which was intended to establish minimum care standards for pediatric patients treated in regional centers. Of all the included studies, 6.9% were conducted in low- and middle-income countries, and no studies were performed in countries represented on the panel.

CONCLUSION: The panel made recommendations on the basis of existing evidence but identified important gaps in knowledge from the region and from resource-limited settings that may affect the clinical applicability of these recommendations. These deficiencies suggest a research agenda that will enable future guidelines to be more responsive to the local context.

Kumar, Ambuj, Subhash Sahu, Shivank Sethi, Shailendra Ratre, Vijay Parihar, Narayan Swamy, and Yad Ram Yadav. (2020) 2020. “Computerized Tomography-Based Morphometric Analysis of Cervical Spinal Canal in Central Indian Population.”. Journal of Neurosciences in Rural Practice 11 (2): 274-77. https://doi.org/10.1055/s-0040-1703962.

Objective  Normal cervical spine canal morphometry is critical for understanding the pathology of certain diseases and for proper preoperative planning. Computerized tomography (CT) scan can replace older conventional radiography techniques by providing more accurate morphometric measurements. This study was aimed to find out various dimensions of the cervical spinal canal of central Indian population. Materials and Methods  A prospective study was conducted including 100 consecutive cervical spine CT scan of asymptomatic adult subjects. The anteroposterior sagittal canal diameter (SCD), transverse canal diameter (TCD), canal surface area (CSA), and Pavlov-Torg Ratio (PTR) from C2 to C7 were calculated. Statistical Analysis  Data were entered in Microsoft Excel Sheet 2007 and statistical analysis was performed by IBM SPSS statistics 2.0 version. p -Value < 0.05 was considered as significant. Results  Age ranged from 18 years to 77 years with mean age 39.5 years. There was no significant difference in all the dimensions (SCD, TCD, CSA) in male and female except at C2 level, where SCD, TCD, and CSA were significant larger in male. The mean SCD, TCD, and CSA is largest at C2 level (14.4 ± 1.63 mm, 21.57 ± 1.59 mm, and 156.20 ± 24.98 mm 2 , respectively) and smallest at C4 level (12.77 ± 1.48 mm, 20.37 ± 1.72 mm, and 130.42 ± 21.20 mm 2 ). PTR showed very little variation. Conclusion  Normal values of cervical spinal canal could serve as a future reference. CT scan provides more accurate measurement. More studies are needed as there could be variations in dimensions in different regions in India.

Kaur, Rimplejeet, Jaykaran Charan, Tea Reljic, Surjit Singh, Pankaj Bhardwaj, Athanasios Tsalatsanis, and Ambuj Kumar. (2020) 2020. “Relationship Between Clinical Trials and Disease Burden of India: A Cross-Sectional Study.”. Journal of Pharmacy & Bioallied Sciences 12 (3): 269-76. https://doi.org/10.4103/jpbs.JPBS_197_19.

BACKGROUND: Research output/efforts in a country should be reflective of the disease burden. India is a site for several national and multinational clinical trials. However, whether clinical trials performed in India reflect the disease burden is not well known.

OBJECTIVES: The aim of this study was to evaluate the relationship between disease burden and clinical trials performed in India.

MATERIALS AND METHODS: We extracted data on the disease burden from the World Health Organization (WHO) website and on characteristics of clinical trials performed in India from the Clinical Trial Registry of India (CRTI). The correlation between disease burden parameters of overall mortality, disability-adjusted life years (DALYs), years lost due to disability (YLD) and years of life lost (YLL), and the frequency of clinical trials associated with a particular disease was assessed. Additional subgroup analysis according to the number of trial centers, study phase, and medicine type was also performed.

RESULTS: Only 18% of clinical trials addressed top 10 diseases associated with 68.3% of overall mortality, and 8% of clinical trials addressed top 10 diseases associated with 52.3% of DALYs. Similarly, 16% of clinical trials addressed top 10 diseases associated with 53.2% YLDs. Furthermore, top 10 diseases associated with 65.9% of YLLs were addressed in only 8% of ongoing clinical trials. The overall correlation between any disease burden parameters with the diseases being explored in clinical trials was poor.

CONCLUSION: There is a mismatch between diseases for which clinical trials are happening in the India and the disease burden of India. Measures need to be taken to fulfill this gap between demand and need.

Kumar, Ambuj, Ahmed Ansari, Yasuhiro Yamada, Tsukasa Kawase, and Yoko Kato. (2020) 2020. “Hearing Outcomes After Microvascular Decompression for Hemifacial Spasm: An Institutional Experience.”. Asian Journal of Neurosurgery 15 (2): 344-48. https://doi.org/10.4103/ajns.AJNS_362_19.

INTRODUCTION: Hearing loss following microvascular decompression (MVD) for hemifacial spasm is one of the most dreaded complications. Several factors such as stretching of VIII cranial nerve, vasospasm of labyrinthine artery, and acoustic trauma due to drill noise may be considered in its causation. We evaluated the incidence and severity of hearing loss following MVD in hemifacial spasm and the factors which might be responsible for this complication.

METHODS: A retrospective analysis of 30 patients operated for hemifacial spasm between January 1, 2014, and December 31, 2018, with at least 3 months of follow-up were included in the study. Retromastoid craniotomy was made, and Teflon was placed between involved vessel and VII nerve.

RESULTS: Freedom from hemifacial spasm was noted in 27 of 30 patients. Moderate spasm persisted in one patient, which was controlled with medications. The recurrence was noted in 3 patients at 6 months follow-up. Postoperatively, hearing loss was found in one female patient. The offending vessel was both anterior inferior cerebellar artery (AICA) and posterior inferior cerebellar artery (PICA) loop, which was transpositioned during surgery, and the patient was spasm free postoperatively.

CONCLUSION: The incidence of hearing loss following MVD can be minimized using proper surgical techniques and various intraoperative adjuncts such as brainstem auditory evoked responses monitoring, use of endoscope, and indocyanine green or dual-image video angiography.

Silva, Marc A, Dayana Calvo, Erin M Brennan, Tea Reljic, Leah Drasher-Phillips, Daniel J Schwartz, Ambuj Kumar, Bridget A Cotner, Daniel J Taylor, and Risa Nakase-Richardson. (2020) 2020. “Incidence and Predictors of Adherence to Sleep Apnea Treatment in Rehabilitation Inpatients With Acquired Brain Injury.”. Sleep Medicine 69: 159-67. https://doi.org/10.1016/j.sleep.2020.01.016.

OBJECTIVE: The purpose of this study was to describe incidence and assess predictors of adherence to Positive Airway Pressure (PAP) therapy for Obstructive Sleep Apnea (OSA) in persons with acquired brain injury (ABI).

METHODS: A 2012-2015 retrospective analysis of consecutive ABI patients admitted for neurorehabilitation, referred for polysomnography (PSG), and prescribed PAP for OSA. Univariable linear regressions were conducted to examine predictors of average hours of nightly PAP use. Univariable logistic regressions were conducted to examine predictors of PAP adherence using the conventional clinical definition of ≥4 h per night ≥70% of the time. Persons with traumatic etiology were separately analyzed.

RESULTS: ABI etiology was 51% traumatic, 36% stroke, and 13% other nontraumatic causes. Nearly two-thirds were nonadherent to PAP. For the overall sample, higher average nightly PAP usage was significantly predicted by positive hypertension diagnosis (β = 0.271, p = 0.019). Likewise, greater adherence based on the conventional cutoff was predicted by poorer motor functioning at hospital admission (OR = 0.98, p = 0.001) and lower oxygen saturation nadir (OR = 0.99, p = 0.003). For those with traumatic injuries, greater adherence was predicted by poorer functional status at hospital admission (OR = 0.98, p = 0.010) and positive hypertension diagnosis (OR = 0.16, p = 0.023).

CONCLUSIONS: In this study of hospitalized neurorehabilitation patients with ABI and comorbid OSA, predictors of adherence included lower oxygen saturation, poorer functional status and hypertension diagnosis, perhaps signifying the role of greater severity of illness on treatment adherence. High rates of refusal and nonadherence to frontline PAP therapy for sleep apnea is a concern for persons in recovery form ABI who are at a time of critical neural repair.

Kumar, Ambuj, Raghavendra Kumar Sharma, Riki Tanaka, Yashuhiro Yamada, Katsumi Takizawa, and Yoko Kato. (2020) 2020. “High-Flow Bypass With Radial Artery Graft for Cavernous Carotid Aneurysm.”. Asian Journal of Neurosurgery 15 (3): 678-82. https://doi.org/10.4103/ajns.AJNS_82_20.

Cavernous carotid aneurysms can be managed by different surgical as well as endovascular methods. The aim of treatment is to exclude the aneurysm from circulation and maintain normal cerebral blood flow. We are reporting a case of incidentally detected CCA managed by high flow bypass with radial artery graft. We discuss the surgical technique and nuances of high flow bypass surgery.

Kutty, Raja K, Ambuj Kumar, Yasuhiro Yamada, Tsukosa Kawase, Riki Tanaka, Kyosuke Miyatani, Saeko Higashiguchi, Vigneswar Ravishankar, Katsumi Takizawa, and Yoko Kato. (2020) 2020. “Visual Outcomes After Surgery for Paraclinoid Aneurysms: A Fujita Experience.”. Asian Journal of Neurosurgery 15 (2): 363-69. https://doi.org/10.4103/ajns.AJNS_39_20.

INTRODUCTION: The surgical strategies for clipping of paraclinoid aneurysms are diverse. These aneurysms are unique in their location, as they closely abut the anterior clinoid process (ACP) and the optic nerve. The ultimate goal of clipping encompasses the exposure of neck of the aneurysm which is seldom complete without the manipulation of optic nerve and the ACP. This manipulation may result in disturbances of vision postoperatively. We analyze our results of visual outcomes in the surgery for paraclinoid aneurysms in this retrospective study.

MATERIALS AND METHODS: All patients with paraclinoid aneurysms who underwent surgery from June 2014 to June 2019 were included in the study. Surgical procedure was uniform in all patients which included anterior clinoidectomy and clipping of aneurysms as per the Bantane protocol. Glasgow Outcome Scale as well as vision was assessed at discharge and at 1 month and 6 months.

RESULTS: There were 77 cases of paraclinoid aneurysms operated during the abovementioned period. All patients had no symptoms related to vision preoperatively. Visual deterioration was noted in two patients. All patients were discharged with a good outcome on the Glasgow Outcome Scale.

CONCLUSION: Paraclinoid aneurysm has a good outcome when treated with surgery. The visual deterioration following surgery can be minimized with extradural anterior clinoidectomy and careful handling of the vessels and nerve.

Desai, Binita, Jayendrakumar K Kosambiya, Bharat Patel, Apurva Barve, Ambuj Kumar, and Kristen J Wells. (2020) 2020. “Knowledge about Reproductive Tract Infections and Sex Work Among Female Textile Workers in Surat, India.”. Health Care for Women International 41 (10): 1182-97. https://doi.org/10.1080/07399332.2019.1597873.

In this qualitative study, we investigated knowledge about reproductive tract infections (RTIs) and commercial sex work among female textile workers of Surat, India. We analyzed data from three focus groups conducted with 18 women using content analysis. Participants had some knowledge about the symptoms of RTIs; however, they had limited knowledge about RTI prevention, transmission, and treatment. None used condoms consistently for RTI prevention. The women attributed economic hardship as one of the main reasons for engaging in commercial sex work. Our study is one of the first to evaluate sexual and reproductive health among female textile workers in India.

Aslam, Sadaf, Jacentha Buggs, Jacob Wasserman, Kendall Chaves, Ebonie Rogers, Ambuj Kumar, and James Huang. (2020) 2020. “Outcomes With Age Combinations in Living Donor Kidney Transplantation.”. The American Surgeon 86 (6): 659-64. https://doi.org/10.1177/0003134820923312.

INTRODUCTION: Reevaluation of donor criteria, including age, is needed to combat organ shortages, lengthy wait times, and anticipated recipient mortality rates. The purpose of this study was to evaluate donor and recipient (D/R) age combinations and patient and graft survival outcomes.

METHODS: Single-organ, living donor kidney transplantations (LDKTs) from 2012 to 2018 were retrospectively reviewed. Donors and recipients were placed into "older" and "younger" age categories of 50 years and above or below age 50, then analyzed with SPSS version 25.

RESULTS: We performed 347 LDKTs. Younger-to-older pairings had significantly higher rates of smoking in recipient (53.6%) and hepatitis C (5.5%), but shorter hospital stays (5.3 days). Older-to-younger pairings had the longest hospital stays (7.4 days) but the shortest cold ischemic time (2.3 hours). Notably, there was no significant variance in delayed graft function (first-week dialysis) between groups. Regarding complication rates, only bleeding within 30 days, highest in older-to-older pairings (7.7%), and renal complications, highest in older-to-younger pairings, significantly varied between groups. Interestingly, though younger-to-older cases had the longest mean graft survival time, older kidneys lasted 537 days longer in older recipients than in younger recipients.

DISCUSSION: These results indicate there is not a one-size-fits-all approach when considering outcomes of donor/recipient age-pairings in LDKT, as significant correlations did not consistently favor one age-pairing over others. Regardless of age-pairing, LDKT provides gold standard treatment and expands the availability of organs. Future research into the impact of age-pairing on specific variables, national or multicenter studies, and protocol development for evaluating donor/recipient age-pairings is needed.

Sharma, Raghavendra Kumar, Ambuj Kumar, Yasuhiro Yamada, Riki Tanaka, Saurabh Sharma, Kyosuke Miyatani, Saeko Higashiguchi, Tsukasa Kawase, Srikanth Talluri, and Yoko Kato. (2020) 2020. “Institutional Experience of Microsurgical Management in Posterior Circulation Aneurysm.”. Asian Journal of Neurosurgery 15 (3): 484-93. https://doi.org/10.4103/ajns.AJNS_69_20.

INTRODUCTION: Posterior circulation aneurysm constitutes 15%-20% of all intracerebral aneurysms. With the advancement of endovascular techniques, the microsurgery for posterior circulation aneurysms has been pushed back a little. Even the International Subarachnoid Aneurysmal Trial gave support to the concepts of endovascular procedures, but microsurgical modality should not be discouraged. We present our institutional experience of microsurgical techniques on posterior circulation aneurysms.

MATERIALS AND METHODS: We performed a retrospective analysis of 37 patients of posterior circulation aneurysm from 2015 to 2019, referred to Bantane Hospital, Japan. We included all posterior circulation aneurysms such as basilar tip, basilar trunk, and vertebral artery-posterior inferior cerebellar artery (VA-PICA) aneurysms, admitted and treated with clipping or bypass and trapping. We assessed the outcome as measured by modified Rankin Score (mRS), complications, and mortality.

RESULTS: Out of 37 patients, 10 cases were a basilar tip, one case was the basilar trunk, and 26 cases were VA-PICA aneurysm. Intraoperatively, neuromonitoring, indocyanine green dye, dual-image videoangiography (DIVA), and neuro endoscope were used. Two patients of basilar tip aneurysm developed third cranial nerve paresis and six patients of VA-PICA aneurysm developed lower cranial nerve paresis which resolved spontaneously. All the patients were discharged with mRS of 0 or 1. No mortality was recorded in our study.

CONCLUSION: Microsurgical clipping of posterior circulation aneurysm is safe in unruptured aneurysm with a very low risk of mortality and morbidity under experienced hands. All postoperative complications in our study were transient and resolved with time with no residual deficits. Preoperative simulation, intraoperative neuromonitoring, DIVA, and neuro endoscope help achieve complete obliteration of aneurysmal sac and avoid complications.