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Campos JK, Zarrin DA, Meyer BM, Khan MW, Laghari FJ, Collard de Beaufort JC, Amin G, Beaty NB, Bender MT, Suzuki S, Colby GP, Lin LM, Coon AL. Use of a large-bore 088 intracranial access support catheter for delivery of large intracranial devices: case series with the TracStar LDP in 125 cases. J Neurointerv Surg 2024:jnis-2023-021054. [PMID: 38418227 DOI: 10.1136/jnis-2023-021054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 02/02/2024] [Indexed: 03/01/2024]
Abstract
BACKGROUND The delivery of neuroendovascular devices requires a robust proximal access platform. This demand has previously been met with a 6Fr long sheath (8Fr guide) that is placed in the proximal internal carotid artery (ICA) or vertebral artery segments. We share our experience with the first 0.088 inch 8Fr guide catheter designed for direct intracranial access. METHODS We retrospectively reviewed a prospectively maintained IRB-approved institutional database of the senior authors to identify all cases where the TracStar Large Distal Platform (LDP) was positioned within the intracranial vasculature, defined as within or distal to the petrous ICA, vertebral artery (V3) segments, or transverse sinus. Technical success was defined as safe placement of the TracStar LDP within or distal to the described distal vessel segments with subsequent complication-free device implantation. RESULTS Over the 41-month study period from January 2020 to June 2023, 125 consecutive cases were identified in whom the TracStar LDP was navigated into the intracranial vasculature for triaxial delivery of large devices, 0.027 inch microcatheter and greater, for aneurysm treatment (n=108, 86%), intracranial angioplasty/stenting (n=15, 12%), and venous sinus stenting (n=2, 1.6%). All cases used a direct select catheter technique for initial guide placement (no exchange). Posterior circulation treatments occurred in 14.4% (n=18) of cases. Technical success was achieved in 100% of cases. No vessel dissections occurred in any cases. CONCLUSION The TracStar LDP is an 0.088 inch 8Fr guide catheter that can establish direct intracranial access with an acceptable safety profile. This can be achieved in a wide range of neurointerventional cases with a high rate of technical success.
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Affiliation(s)
- Jessica K Campos
- Department of Neurosurgery, University of California Irvine, Orange, California, USA
| | - David A Zarrin
- David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
| | - Benjamen M Meyer
- College of Medicine Tucson, The University of Arizona, Tucson, Arizona, USA
| | - Muhammad Waqas Khan
- Carondelet Neurological Institute, Carondelet Saint Joseph's Hospital, Tucson, Arizona, USA
| | - Fahad J Laghari
- Carondelet Neurological Institute, Carondelet Saint Joseph's Hospital, Tucson, Arizona, USA
| | | | - Gizal Amin
- Carondelet Neurological Institute, Carondelet Saint Joseph's Hospital, Tucson, Arizona, USA
| | - Narlin B Beaty
- Department of Neurosurgery Tallahassee Memorial Hospital, Tallahassee Memorial Hospital Florida State University, Tallahassee, Florida, USA
| | - Matthew T Bender
- Department of Neurosurgery, University of Rochester Medical Center, Rochester, New York, USA
| | - Shuichi Suzuki
- Department of Neurosurgery, University of California Irvine, Orange, California, USA
| | - Geoffrey P Colby
- Department of Neurosurgery, University of California Los Angeles, Los Angeles, California, USA
| | - Li-Mei Lin
- Carondelet Neurological Institute, Carondelet Saint Joseph's Hospital, Tucson, Arizona, USA
| | - Alexander L Coon
- Carondelet Neurological Institute, Carondelet Saint Joseph's Hospital, Tucson, Arizona, USA
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Campos JK, Meyer BM, Khan MW, Laghari FJ, Zarrin DA, Collard de Beaufort J, Amin G, Golshani K, Bender MT, Colby GP, Lin LM, Coon AL. Feasibility of super-bore 0.088″ mechanical thrombectomy in M1 vessels smaller than 8 French: Experience in 20 consecutive cases. Interv Neuroradiol 2024:15910199241229198. [PMID: 38418397 DOI: 10.1177/15910199241229198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2024] Open
Abstract
INTRODUCTION Superbore 0.088″ catheters provide a platform for optimizing aspiration efficiency and flow control during stroke mechanical thrombectomy procedures. New superbore catheters have the distal flexibility necessary to navigate complex neurovascular anatomy while providing the proximal support of traditional 8F catheters. The safety and feasibility of Zoom 88™ superbore angled-tip catheters in the middle cerebral artery (MCA) segments smaller than the catheter diameter have not been previously described. METHODS Twenty consecutive cases of acute MCA mechanical thrombectomy were retrospectively identified from the senior authors' prospectively maintained Institutional Review Board-approved database, in which the Zoom 88 (Imperative Care, Campbell, CA) catheter was successfully navigated to at least the M1 segment. Patient demographics, procedural details, and periprocedural information were analyzed. Rates and averages (standard errors) are generally reported. RESULTS The average National Institutes of Health Stroke Scale at presentation and age were 15 ± 2 and 73 ± 3 years, respectively. The M1 and M2 occlusions were evenly distributed. The average M1 measurements before thrombectomy ranged from 2.36 ± 0.07 mm proximally to 2.00 ± 0.11 mm distally, and after thrombectomy, they ranged from 2.34 ± 0.07 mm proximally to 1.97 ± 0.10 mm distally. First-pass modified thrombolysis in cerebral infarction (mTICI) 2C/3 recanalization was achieved in 40% of cases, and final mTICI 2C/3 recanalization was achieved in 90% of cases. A single case of mild vasospasm was managed with verapamil. No hemorrhagic or periprocedural complications were noted. CONCLUSION Superbore 0.088″ catheters with flexible distal segments can be safely navigated to the MCA to augment mechanical thrombectomy even when the MCA segment is smaller than the catheter.
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Affiliation(s)
- Jessica K Campos
- Department of Neurological Surgery, University of California Irvine, Orange, CA, USA
| | | | | | - Fahad J Laghari
- Carondelet Neurological Institute, St. Joseph's Hospital, Tucson, AZ, USA
| | - David A Zarrin
- University of California Los Angeles, David Geffen School of Medicine, Los Angeles, CA, USA
| | | | - Gizal Amin
- Carondelet Neurological Institute, St. Joseph's Hospital, Tucson, AZ, USA
| | - Kiarash Golshani
- Department of Neurological Surgery, University of California Irvine, Orange, CA, USA
| | - Matthew T Bender
- Department of Neurosurgery, University of Rochester, Rochester, NY, USA
| | - Geoffrey P Colby
- Department of Neurosurgery, University of California Los Angeles, Los Angeles, CA, USA
| | - Li-Mei Lin
- Carondelet Neurological Institute, St. Joseph's Hospital, Tucson, AZ, USA
| | - Alexander L Coon
- Carondelet Neurological Institute, St. Joseph's Hospital, Tucson, AZ, USA
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Campos JK, Meyer BM, Zarrin DA, Khan MW, Collard de Beaufort JC, Amin G, Avery MB, Golshani K, Beaty NB, Bender MT, Colby GP, Lin LM, Coon AL. Immediate procedural safety of adjunctive proximal coil occlusion in middle meningeal artery embolization for chronic subdural hematomas: Experience in 137 cases. Interv Neuroradiol 2024:15910199231224003. [PMID: 38166510 DOI: 10.1177/15910199231224003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2024] Open
Abstract
BACKGROUND Endovascular embolization of the middle meningeal artery (MMA) has emerged as an adjunctive and stand-alone modality for the management of chronic subdural hematomas (cSDH). We report our experience utilizing proximal MMA coil embolization to augment cSDH devascularization in MMA embolization. METHODS MMA embolization cases with adjunctive proximal MMA coiling were retrospectively identified from a prospectively maintained IRB-approved database of the senior authors. RESULTS Of the 137 cases, all patients (n = 89, 100%) were symptomatic and underwent an MMA embolization procedure for cSDH. 50 of the patients underwent bilateral embolizations, with 53% (n = 72) for left-sided and 47% (n = 65) for right-sided cSDH. The anterior MMA branch was embolized in 19 (14%), posterior in 16 (12%), and both in 102 (74.5%) cases. Penetration of the liquid embolic to the contralateral MMA or into the falx was present in 38 (28%) and 31 (23%) cases, respectively, and 46 (34%) cases had ophthalmic or petrous collateral (n = 41, 30%) branches. MMA branches coiled include the primary trunk (25.5%, n = 35), primary and anterior or posterior MMA trunks (20%, n = 28), or primary with the anterior and posterior trunks (54%, n = 74). A mild ipsilateral facial nerve palsy was reported, which remained stable at discharge and follow-up. Absence of anterograde flow in the MMA occurred in 137 (100%) cases, and no cases required periprocedural rescue surgery for cSDH evacuation. The average follow-up length was 170 ± 17.9 days, cSDH was reduced by 4.24 ± 0.5(mm) and the midline shift by 1.46 ± 0.27(mm). Complete resolution was achieved in 63 (46.0%) cases. CONCLUSION Proximal MMA coil embolization is a safe technique for providing additional embolization/occlusion of the MMA in cSDH embolization procedures. Further studies are needed to evaluate the potential added efficacy of this technique.
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Affiliation(s)
- Jessica K Campos
- Department of Neurological Surgery, University of California Irvine, Orange, CA, USA
| | | | - David A Zarrin
- David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA, USA
| | | | | | - Gizal Amin
- Carondelet Neurological Institute, St Joseph's Hospital, Tucson, AZ, USA
| | - Michael B Avery
- Department of Neurosurgery, Banner University Medical Center / The University of Arizona, Tucson, AZ, USA
| | - Kiarash Golshani
- Department of Neurological Surgery, University of California Irvine, Orange, CA, USA
| | - Narlin B Beaty
- Department of Neurosurgery, Florida State University, Tallahassee Memorial Hospital, Tallahassee, FL, USA
| | - Matthew T Bender
- Department of Neurosurgery, University of Rochester, Rochester, NY, USA
| | - Geoffrey P Colby
- Department of Neurosurgery, University of California Los Angeles, Los Angeles, CA, USA
| | - Li-Mei Lin
- Carondelet Neurological Institute, St Joseph's Hospital, Tucson, AZ, USA
| | - Alexander L Coon
- Carondelet Neurological Institute, St Joseph's Hospital, Tucson, AZ, USA
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Campos JK, Meyer BM, Khan MW, Zarrin DA, Beaufort JCCD, Amin G, Lin LM, Coon AL. Triple Stentriever "Bouquet" Deployment with Zoom 88 Large-Bore Aspiration and Walrus Balloon-Guide Catheter for the Definitive Thrombectomy of a Carotid Free-Floating Thrombus. J Neurol Surg Rep 2024; 85:e17-e22. [PMID: 38348015 PMCID: PMC10861319 DOI: 10.1055/s-0044-1778695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 12/02/2023] [Indexed: 02/15/2024] Open
Abstract
Formation of a carotid free-floating thrombus (CFFT) is a rare and life-threatening condition without an optimal management plan. A 78-year-old woman with a history of prior right internal carotid artery (ICA) mechanical thrombectomy and antiplatelet noncompliance presented with transient ischemic attacks secondary to a recurrent CFFT in the right ICA. Given her symptoms and recurrent CFFT, endovascular mechanical thrombectomy was performed. A balloon guide-catheter (BGC) and a Zoom 88 distal access catheter were brought into the right distal common carotid artery and proximal ICA bulb, respectively. Three 0.021-inch microcatheters, each loaded with a unique stentriever, were navigated beyond the thrombus into the upper cervical ICA and deployed in a bouquet fashion. The BGC was inflated to achieve flow arrest, and the Zoom 88 aspiration catheter was tracked over the three bouquet stentrievers to ingest the thrombus. Follow-up angiography demonstrated recanalization of the proximal cervical ICA without evidence of residual thrombus. Twenty-four-hour postoperative computed tomography imaging did not reveal any evidence of new infarction. The patient was discharged home with an intact neurological examination, compliant on aspirin and apixaban. We demonstrate a novel technique utilizing a large-bore catheter with a triple stentriever "bouquet" to thrombectomize a CFFT.
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Affiliation(s)
- Jessica K. Campos
- Department of Neurological Surgery, University of California Irvine, Orange, California, United States
| | - Benjamen M. Meyer
- University of Arizona, College of Medicine, Tucson, Arizona, United States
| | - Muhammad W. Khan
- Department of Neurological Surgery, Carondelet Neurological Institute, St. Joseph's Hospital, Tucson, Arizona, United States
| | - David A. Zarrin
- Department of Neurosurgery, University of California Los Angeles, Los Angeles, California, United States
| | | | - Gizal Amin
- Department of Neurological Surgery, Carondelet Neurological Institute, St. Joseph's Hospital, Tucson, Arizona, United States
| | - Li-Mei Lin
- Department of Neurological Surgery, Carondelet Neurological Institute, St. Joseph's Hospital, Tucson, Arizona, United States
| | - Alexander L. Coon
- Department of Neurological Surgery, Carondelet Neurological Institute, St. Joseph's Hospital, Tucson, Arizona, United States
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Lin LM, Collard de Beaufort J, Wang AS, Campos JK, Zarrin DA, Meyer BM, Colby GP, Coon AL. Augmentation of flow diverter vessel wall apposition using the Comaneci device: case experience from a novel, off-label technique. J Neurointerv Surg 2023:jnis-2023-020533. [PMID: 37586816 DOI: 10.1136/jnis-2023-020533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Accepted: 07/15/2023] [Indexed: 08/18/2023]
Abstract
BACKGROUND Flow diversion (FD) embolization of intracranial cerebral aneurysms is an increasingly common modality where treatment success depends on adequate vessel wall apposition of the device. This study aimed to investigate off-label use of the Comaneci device for augmenting vessel wall apposition in post-deployed flow diversion stents (FDS). METHODS Over a 20- month period, all FD cases for the treatment of internal carotid artery (ICA) aneurysms were reviewed. Cases in which the Comaneci device was used to augment vessel wall apposition were analyzed. Data including patient demographics, case characteristics, and procedural outcomes were collected and analyzed as counts. RESULTS From a total of 74 ICA FD cases, the Comaneci device was used to improve vessel wall apposition in 22 cases (29.7%) . Of these cases, 91% were female with a mean patient age of 64.9±11.3 years, and an average aneurysm size of 4.5±2.5 mm. Comaneci device deployment and retrieval was successful in all (100%) cases, with an average fluoroscopy time of 27.3±7.8 min, an average contrast usage of 25.8±13.2 mL, and an average radiation exposure of 915.1±320.8 mGy. Only two cases (9%) required subsequent balloon angioplasty after Comaneci deployment to improve vessel wall apposition throughout the FDS. CONCLUSION Our experience with this technique demonstrates the feasibility of using the Comaneci device for augmentation of FDS vessel wall apposition with 100% success in the deployment and retrieval of the Comaneci device.
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Affiliation(s)
- Li-Mei Lin
- Neurosurgery, Carondelet Neurological Institute, Carondelet Health Network, St. Joseph's Hospital, Tucson, Arizona, USA
| | | | - Alice S Wang
- Neurosurgery, Riverside University Health System, Moreno Valley, California, USA
| | - Jessica K Campos
- Neurosurgery, University of California Irvine, Irvine, California, USA
| | - David A Zarrin
- Neurosurgery, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, USA
| | - Benjamen M Meyer
- Neurosurgery, College of Medicine, University of Arizona, Tucson, Arizona, USA
| | - Geoffrey P Colby
- Neurosurgery, University of California Los Angeles, Los Angeles, California, USA
| | - Alexander L Coon
- Neurosurgery, Carondelet Neurological Institute, Carondelet Health Network, St. Joseph's Hospital, Tucson, Arizona, USA
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Meyer BM, Campos JK, Collard de Beaufort JC, Chen I, Khan MW, Amin G, Zarrin DA, Lien BV, Coon AL. Trends in Dual Antiplatelet Therapy Use for Neurointerventional Procedures for the Management of Intracranial Aneurysms. Biomedicines 2023; 11:2234. [PMID: 37626730 PMCID: PMC10452183 DOI: 10.3390/biomedicines11082234] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 07/30/2023] [Accepted: 08/03/2023] [Indexed: 08/27/2023] Open
Abstract
The use of periprocedural dual antiplatelet therapy (DAPT) has significantly evolved along with innovations in the endovascular management of intracranial aneurysms. Historically, aspirin and clopidogrel have been the most commonly employed regimen due to its safety and efficacy. However, recent studies highlight the importance of tailoring DAPT regimens to individual patient characteristics which may affect clopidogrel metabolism, such as genetic polymorphisms. In the present report, a systematic review of the literature was performed to determine optimal antiplatelet use with flow diverting stents, intracranial stents, intrasaccular devices, and stent-assisted coiling. Studies were analyzed for the number of aneurysms treated, DAPT regimen, and any thromboembolic complications. Based on inclusion criteria, 368 studies were selected, which revealed the increasing popularity of alternative DAPT regimens with the aforementioned devices. Thromboembolic or hemorrhagic complications associated with antiplatelet medications were similar across all medications. DAPT with ticagrelor, tirofiban, or prasugrel are effective and safe alternatives to clopidogrel and do not require enzymatic activation. Further clinical trials are needed to evaluate different antiplatelet regimens with various devices to establish highest-level evidence-based guidelines and recommendations.
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Affiliation(s)
| | - Jessica K. Campos
- Department of Neurological Surgery, University of California Irvine, Orange, CA 92868, USA
| | | | - Ivette Chen
- Harvard University, Cambridge, MA 02138, USA
| | - Muhammad Waqas Khan
- Carondelet Neurological Institute, St. Joseph’s Hospital, Tucson, AZ 85711, USA
| | - Gizal Amin
- Carondelet Neurological Institute, St. Joseph’s Hospital, Tucson, AZ 85711, USA
| | - David A. Zarrin
- School of Medicine, University of California, Los Angeles, CA 90095, USA
| | - Brian V. Lien
- Department of Neurological Surgery, University of California Irvine, Orange, CA 92868, USA
| | - Alexander L. Coon
- Carondelet Neurological Institute, St. Joseph’s Hospital, Tucson, AZ 85711, USA
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Meyer BM, de Andrada Pereira B, Mamaril-Davis J, Hurlbert RJ. Consultations during COVID: Effects of a Pandemic on Neurosurgical Care. World Neurosurg 2023:S1878-8750(23)00794-5. [PMID: 37331476 DOI: 10.1016/j.wneu.2023.06.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 06/07/2023] [Accepted: 06/08/2023] [Indexed: 06/20/2023]
Abstract
INTRODUCTION COVID-19 has impacted Neurosurgical care around the world. But reports describing patient admission trends during the pandemic have provided limited time frames and diagnoses. The purpose of this paper was to analyze the impact of COVID-19 on Neurosurgical care provided to our Emergency Department during the outbreak. METHODS Patient admission data were collected based on a list of 35 ICD-10 codes, which were placed into one of four categories: head and spine trauma ("Trauma"), head and spine infection ("Infection"), degenerative spine ("Degenerative") and subarachnoid hemorrhage / brain tumor ("Control"). Emergency room consultations to the Neurosurgery Department were collected from March 2018 to March 2022, representing 2 years before COVID and 2 years of pandemic. We hypothesized that Control cases would remain stable throughout the two time periods while Trauma, and Infection would decrease. Because of widespread clinic restrictions we postulated Degenerative (spine) cases presenting to the ER would increase. RESULTS During the first two years of the COVID pandemic, Neurosurgical Trauma and Degenerative ER patients decreased compared to pre-pandemic levels, while Cranial and Spinal infections increased, and continued to do so during the pandemic period studied. Brain tumors and sub-arachnoid hemorrhages ('control' cases) did not change in a significant way throughout the four-year analysis. CONCLUSION The COVID pandemic significantly altered the demographics of our Neurosurgical Emergency Room patient population and continues to do so.
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Affiliation(s)
- Benjamen M Meyer
- College of Medicine, The University of Arizona College of Medicine - Tucson, Tucson, Arizona
| | | | - James Mamaril-Davis
- College of Medicine, The University of Arizona College of Medicine - Tucson, Tucson, Arizona
| | - R John Hurlbert
- Department of Neurosurgery, Banner University Medical Center / The University of Arizona, Tucson, Arizona.
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de Andrada Pereira B, Meyer BM, Alvarez Reyes A, Orenday-Barraza JM, Brasiliense LB, Hurlbert RJ. Traumatic cervical spine subarachnoid hemorrhage with hematoma and cord compression presenting as Brown-Séqüard syndrome: illustrative case. J Neurosurg Case Lessons 2022; 4:CASE22431. [PMID: 36471576 PMCID: PMC9724008 DOI: 10.3171/case22431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 11/01/2022] [Indexed: 12/12/2022]
Abstract
BACKGROUND Spinal hematomas are a rare entity with broad etiologies, which stem from idiopathic, tumor-related, and vascular malformation etiologies. Less common causes include traumatic blunt nonpenetrating spinal hematomas with very few cases being reported. In the present manuscript presents a case report and review of the literature of a rare traumatic entity of a cervical subarachnoid hematoma in association with Brown-Séquard syndrome in a patient on anticoagulants. Searches were performed on PubMed and Embase for specific terms related. OBSERVATIONS A well-documented case of an 83-year-old female taking anticoagulants with traumatic cervical subarachnoid hematoma presenting as Brown-Séquard syndrome was reported. Six similar cases were identified, scrutinized, and analyzed in the literature review. LESSONS Traumatic blunt nonpenetrating cervical spine subarachnoid hematomas are a rare entity that can happen more specifically in anticoagulant users and in patients with arthritic changes and stenosis of the spinal canal. Rapid neurological deterioration and severe disability warrant early aggressive surgical treatment. This report has the intention to record this case in the medical literature for registry purposes.
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Affiliation(s)
| | - Benjamen M. Meyer
- College of Medicine, University of Arizona Tucson, Tucson, Arizona; and
| | | | - Jose Manuel Orenday-Barraza
- Department of Neurosurgery, University of Arizona Phoenix, Banner University Medical Center, Phoenix, Arizona
| | - Leonardo B. Brasiliense
- Department of Neurosurgery, University of Arizona Tucson, Banner University Medical Center, Tucson, Arizona
| | - R. John Hurlbert
- Department of Neurosurgery, University of Arizona Tucson, Banner University Medical Center, Tucson, Arizona
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Singh R, Meyer BM, Doan MK, Pollock JR, Garcia JO, Rahmani R, Srinivasan VM, Catapano JS, Lawton MT. Opioid Prescription Practices of Neurosurgeons in the United States: An Analysis of the Medicare Database, 2013-2017. Neurosurg open 2021. [DOI: 10.1093/neuopn/okab034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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Turner RE, Overton EB, Meyer BM, Miles MS, Hooper-Bui L. Changes in the concentration and relative abundance of alkanes and PAHs from the Deepwater Horizon oiling of coastal marshes. Mar Pollut Bull 2014; 86:291-297. [PMID: 25127500 DOI: 10.1016/j.marpolbul.2014.07.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 06/28/2014] [Accepted: 07/06/2014] [Indexed: 06/03/2023]
Abstract
We determined changes of 28 alkanes and 43 different PAHs in 418 wetland soil samples collected on ten sampling trips to three Louisiana estuaries before and after they were oiled from the 2010 Deepwater Horizon disaster. There was a significant decline in 22 of the 28 alkane analytes (0.42% day(-1)), no change in 6, over 2.5 years. The concentration of five aromatic petroleum hydrocarbons (PAHs) increased (range 0.25-0.70% day(-1)), whereas the total PAH pool did not change. Of these five, naphthalene and C-1-naphthalenes are suggested to be of higher toxicity than the other three because of their relatively higher volatility or solubility. The relative proportions of alkane analytes, but not PAHs, does not yet resemble that in the pre-oiled marshes after 3 years, The trajectories of nine indicators for degradation/weathering were either inconclusive or misleading (alkanes) or confirmed the relatively meager degradation of PAHs.
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Affiliation(s)
- R E Turner
- Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, LA 70803, United States.
| | - E B Overton
- Department of Environmental Sciences, Louisiana State University, Baton Rouge, LA 70803, United States.
| | - B M Meyer
- Department of Environmental Sciences, Louisiana State University, Baton Rouge, LA 70803, United States.
| | - M S Miles
- Department of Environmental Sciences, Louisiana State University, Baton Rouge, LA 70803, United States.
| | - L Hooper-Bui
- Department of Environmental Sciences, Louisiana State University, Baton Rouge, LA 70803, United States.
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Abstract
Changes in peripheral nerve structural properties after transection were measured weekly for 5 weeks in the distal stump of the sciatic nerve in 50 Sprague-Dawley rats. Each week after transection, the distal stump of the transected nerve showed increased stiffness when compared to intact nerves. Linear elastic stiffness reached a maximum at weeks 1 and 2 after transection, when the transected nerves were 15% stiffer than the contralateral control sides. Toughness was also increased and reached a maximum at week 4 with a 50% difference between values for experimental and control sides. Overall failure load was between 21% and 27% greater, peaking at week 3. An increase in stiffness of the distal stump would result in increased tension at the suture line, as the nerve gap is overcome when performing a delayed neurorraphy. These data suggest, with respect to structural properties, that an end-to-end repair should be carried out at the time of injury; after only 1 week, significant stiffness in the distal segment of the nerve developed, which should result in an increase in tension at the repair site.
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Affiliation(s)
- E B Toby
- Section of Orthopedic Surgery, University of Kansas Medical Center, Kansas City 66160-7387, USA
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12
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Meyer BM. Prescribing authority for nonphysicians. Am J Hosp Pharm 1994; 51:308, 311. [PMID: 7909194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Abstract
By means of loxiglumide, a potent and highly specific antagonist for cholecystokinin (CCK), the effects of blocking CCK receptors on gastrointestinal motility were investigated in a placebo-controlled study in healthy young men (aged 21-39, mean 24 years). Gallbladder contraction stimulated by ingestion of a liquid test meal was completely abolished by oral administration of loxiglumide 30 min before the test meal. Gastric emptying of radio-opaque markers ingested with the test meal was significantly accelerated by loxiglumide (area under the curve [markers x h] 33.3 [SEM 3.8] vs 17.9 [2.7] after placebo). No effect of loxiglumide was found on small-bowel transit time, but 7 days' treatment with oral loxiglumide (800 mg three times daily) significantly shortened colonic transit time (29.4 [4.1] h after placebo, 15.0 [3.4] h after loxiglumide). It is concluded that CCK is an important mediator of meal-induced gallbladder contraction and is involved in the regulation of gastrointestinal motility in man.
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Affiliation(s)
- B M Meyer
- Division of Gastroenterology, University Hospital, Basle, Switzerland
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14
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Abstract
The bentiromide test reliably detects exocrine pancreatic insufficiency. The synthetic peptide attached to p-aminobenzoic acid (PABA) is cleaved by chymotrypsin, PABA is absorbed in the small intestine, partially conjugated in the liver, and excreted in the urine. It has been claimed that the bentiromide test is abnormal not only in patients with pancreatic insufficiency but also in patients with small bowel or liver disease because of impaired PABA absorption or conjugation, respectively. This study prospectively evaluates the bentiromide test in 12 patients with small bowel disease and 18 patients with biopsy-proven liver disease. One of 30 patients had an abnormal bentiromide test. Cumulative 6-h urinary arylamine excretion and plasma PABA concentration, 2 h after administration, were in the same range as healthy controls. We conclude that the bentiromide test is not affected by small bowel or liver disease. An abnormal test is virtually diagnostic for exocrine pancreatic insufficiency.
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Gibbons LW, Cooper KH, Meyer BM, Ellison RC. The acute cardiac risk of strenuous exercise. JAMA 1980; 244:1799-801. [PMID: 7420679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
During a 65-month period, 2,935 adults (mean age, 37 years) kept computer logs of amount and intensity of exercise performed. A total of 374,798 person-hours of exercise, including 2,726,272 km or running and walking, was recorded. Two cardiac events and no deaths occurred during this period. Considered in age-specific categories, the maximum risk estimates (MREs) consistent with these data (upper 95% confidence limits) range from 0.3 to 2.7 events per 10,000 person-hours of exercise for men and 0.6 to 6.0 events per 10,000 person-hours for women. The MREs for women were higher because there were fewer women in the study. If exercise were performed three time per week for 30 minutes per session for a year, these results would lead to MREs from .002 to .027 events per person-year for men and .005 to .05 events per person-year for women. Actual risks are likely to be lower.
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Meyer BM, Barton RF, Harnes JR, McFarland JR. Letters. PHYSICIAN SPORTSMED 1979; 7:9-13. [PMID: 27421484 DOI: 10.1080/00913847.1979.11710830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- B M Meyer
- a Institute for Aerobics Research Dallas
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