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Article: Traumatic spondyloptosis of the cervical spine: A case report and discussion of worldwide treatment trends.

Wong, Kelly E / Chang, Peter S / Monasky, Mark S / Samuelson, Rodney M

Surgical neurology international

2017 Volume 8, Page(s) 89

Abstract: Background: Cervical spondyloptosis is defined as the dislocation of the spinal column most often caused by trauma. Due to compression or transection of the spinal cord, severe neurological deficits are common. Here, we review the literature and report ... ...

Abstract	Background: Cervical spondyloptosis is defined as the dislocation of the spinal column most often caused by trauma. Due to compression or transection of the spinal cord, severe neurological deficits are common. Here, we review the literature and report a case of traumatic C5-6 spondyloptosis that was successfully treated using an anterior-only surgical approach. Methods: The patient presented with quadriplegia and absent sensation distal to the C5 dermatome following a rollover motor vehicle accident. The preoperative American Spinal Injury Association Impairment Scale was A. Computed tomography of the cervical spine revealed C5-6 spondyloptosis, lamina fractures on the right side at the C3-4 level, and widened facet joint on the right side at C6-7. Results: The patient underwent cervical traction and anterior cervical discectomy and fusion at the C5-6, C6-7 levels; no 360° fusion was warranted. Six months postoperatively, the patient remained quadriplegic below the C5 level. Conclusion: Presently, no consensus is present regarding the best treatment for spondyloptosis. Worldwide, the 360° approach is the most commonly used (45%), followed by anterior-only surgery (31%) and posterior-only surgery (25%). The surgical choice depends upon patient-specific features but markedly varies among geographical regions.
Language	English
Publishing date	2017-05-26
Publishing country	United States
Document type	Journal Article
ISSN	2229-5097
ISSN	2229-5097
DOI	10.4103/sni.sni_434_16
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Spatial variability in tree-ring carbon isotope discrimination in response to local drought across the entire loblolly pine natural range.

Lin, Wen / Noormets, Asko / King, John S / Marshall, John / Akers, Madison / Cucinella, Josh / Fox, Thomas R / Laviner, Marshall A / Martin, Timothy A / Mcnulty, Steve / Meek, Cassandra / Samuelson, Lisa / Sun, Ge / Vogel, Jason / Will, Rodney E / Domec, Jean-Christophe

Tree physiology

2021 Volume 42, Issue 1, Page(s) 44–58

Abstract: ... in well-watered conditions (Δ13Cmax) and isotopic drought sensitivity (m) as a change in Δ13C per unit ... PDSI, was the primary factor affecting Δ13Cmax. The strong spatial correlation exhibited by m was ... between lifetime average PDSI and m indicated that loblolly pines were more sensitive to drought at mesic ...

Abstract	Considering the temporal responses of carbon isotope discrimination (Δ13C) to local water availability in the spatial analysis of Δ13C is essential for evaluating the contribution of environmental and genetic facets of plant Δ13C. Using tree-ring Δ13C from years with contrasting water availability at 76 locations across the natural range of loblolly pine, we decomposed site-level Δ13C signals to maximum Δ13C in well-watered conditions (Δ13Cmax) and isotopic drought sensitivity (m) as a change in Δ13C per unit change of Palmer's Drought Severity Index (PDSI). Site water status, especially the tree lifetime average PDSI, was the primary factor affecting Δ13Cmax. The strong spatial correlation exhibited by m was related to both genetic and environmental factors. The long-term average water availability during the period relevant to trees as indicated by lifetime average PDSI correlated with Δ13Cmax, suggesting acclimation in tree gas-exchange traits, independent of incident water availability. The positive correlation between lifetime average PDSI and m indicated that loblolly pines were more sensitive to drought at mesic than xeric sites. The m was found to relate to a plant's stomatal control and may be employed as a genetic indicator of efficient water use strategies. Partitioning Δ13C to Δ13Cmax and m provided a new angle for understanding sources of variation in plant Δ13C, with several fundamental and applied implications.
MeSH term(s)	Carbon Isotopes/analysis ; Droughts ; Pinus taeda ; Trees/physiology ; Water/physiology
Chemical Substances	Carbon Isotopes ; Water (059QF0KO0R)
Language	English
Publishing date	2021-10-06
Publishing country	Canada
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	743341-4
ISSN	1758-4469 ; 0829-318X
ISSN (online)	1758-4469
ISSN	0829-318X
DOI	10.1093/treephys/tpab097
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Article ; Online: Traumatic spondyloptosis of the cervical spine

Kelly E Wong / Peter S Chang / Mark S Monasky / Rodney M Samuelson

Surgical Neurology International, Vol 8, Iss 1, Pp 89-

A case report and discussion of worldwide treatment trends

2017 Volume 89

Abstract	Background: Cervical spondyloptosis is defined as the dislocation of the spinal column most often caused by trauma. Due to compression or transection of the spinal cord, severe neurological deficits are common. Here, we review the literature and report a case of traumatic C5–6 spondyloptosis that was successfully treated using an anterior-only surgical approach. Methods: The patient presented with quadriplegia and absent sensation distal to the C5 dermatome following a rollover motor vehicle accident. The preoperative American Spinal Injury Association Impairment Scale was A. Computed tomography of the cervical spine revealed C5–6 spondyloptosis, lamina fractures on the right side at the C3–4 level, and widened facet joint on the right side at C6–7. Results: The patient underwent cervical traction and anterior cervical discectomy and fusion at the C5–6, C6–7 levels; no 360° fusion was warranted. Six months postoperatively, the patient remained quadriplegic below the C5 level. Conclusion: Presently, no consensus is present regarding the best treatment for spondyloptosis. Worldwide, the 360° approach is the most commonly used (45%), followed by anterior-only surgery (31%) and posterior-only surgery (25%). The surgical choice depends upon patient-specific features but markedly varies among geographical regions.
Keywords	Cervical ; trauma ; spondylolisthesis ; spondyloptosis ; Medicine ; R ; Surgery ; RD1-811 ; Internal medicine ; RC31-1245 ; Neurosciences. Biological psychiatry. Neuropsychiatry ; RC321-571 ; Neurology. Diseases of the nervous system ; RC346-429
Subject code	616
Language	English
Publishing date	2017-01-01T00:00:00Z
Publisher	Medknow Publications
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: The cost of stroke prevention.

Samuelson, Rodney M / Levy, Elad I / Siddiqui, Adnan H / Hopkins, L Nelson

Stroke

2009 Volume 40, Issue 2, Page(s) e41–2; author reply e43

MeSH term(s)	Atorvastatin Calcium ; Clinical Trials as Topic ; Cost-Benefit Analysis ; Heptanoic Acids/economics ; Heptanoic Acids/therapeutic use ; Humans ; Hydroxymethylglutaryl-CoA Reductase Inhibitors/economics ; Hydroxymethylglutaryl-CoA Reductase Inhibitors/therapeutic use ; Pyrroles/economics ; Pyrroles/therapeutic use ; Stroke/economics ; Stroke/prevention & control
Chemical Substances	Heptanoic Acids ; Hydroxymethylglutaryl-CoA Reductase Inhibitors ; Pyrroles ; Atorvastatin Calcium (48A5M73Z4Q)
Language	English
Publishing date	2009-02
Publishing country	United States
Document type	Comment ; Letter ; Research Support, Non-U.S. Gov't
ZDB-ID	80381-9
ISSN	1524-4628 ; 0039-2499 ; 0749-7954
ISSN (online)	1524-4628
ISSN	0039-2499 ; 0749-7954
DOI	10.1161/STROKEAHA.108.520734
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Article: Treatment of ischemic stroke secondary to intracranial vascular disease.

Samuelson, Rodney M / Atwal, Gursant / Levy, Elad I / Hopkins, L Nelson

Clinical neurosurgery

2007 Volume 54, Page(s) 118–121

MeSH term(s)	Angioplasty, Balloon/methods ; Cerebral Infarction/etiology ; Cerebral Infarction/therapy ; Fibrinolytic Agents/therapeutic use ; Humans ; Randomized Controlled Trials as Topic ; Stents ; Thrombolytic Therapy/methods
Chemical Substances	Fibrinolytic Agents
Language	English
Publishing date	2007
Publishing country	United States
Document type	Journal Article ; Review
ZDB-ID	127548-3
ISSN	0069-4827
ISSN	0069-4827
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Article ; Online: The argument to support broader application of extracranial carotid artery stent technology.

Samuelson, Rodney M / Yamamoto, Junichi / Levy, Elad I / Siddiqui, Adnan H / Hopkins, L Nelson

Circulation

2007 Volume 116, Issue 14, Page(s) 1602–10; discussion 1610

MeSH term(s)	Angioplasty ; Carotid Stenosis/mortality ; Carotid Stenosis/surgery ; Humans ; Randomized Controlled Trials as Topic/statistics & numerical data ; Stents
Language	English
Publishing date	2007-10-02
Publishing country	United States
Document type	Comment ; Journal Article ; Review
ZDB-ID	80099-5
ISSN	1524-4539 ; 0009-7322 ; 0069-4193 ; 0065-8499
ISSN (online)	1524-4539
ISSN	0009-7322 ; 0069-4193 ; 0065-8499
DOI	10.1161/CIRCULATIONAHA.106.670034
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Article: Retrograde angioplasty for basilar artery stenosis: bypassing bilateral vertebral artery occlusions.

Chiam, Paul T L / Mocco, J / Samuelson, Rodney M / Siddiqui, Adnan H / Hopkins, L Nelson / Levy, Elad I

Journal of neurosurgery

2009 Volume 110, Issue 3, Page(s) 427–430

Abstract: Basilar artery angioplasty with or without stenting is an emerging and promising treatment for vertebrobasilar insufficiency that is refractory to medical therapy. The usual approach is via a transfemoral route, with access directly through the vertebral ...

Abstract	Basilar artery angioplasty with or without stenting is an emerging and promising treatment for vertebrobasilar insufficiency that is refractory to medical therapy. The usual approach is via a transfemoral route, with access directly through the vertebral artery (VA). An approach from the anterior circulation via the posterior communicating artery has been reported for optimal stent positioning and deployment across basilar apex aneurysms. No similar technique has been reported for treatment of midbasilar stenosis. The authors report a case of severe symptomatic basilar stenosis in which both VAs were occluded. The only option was to perform retrograde basilar angioplasty via the posterior communicating artery. This useful technique should be part of the armamentarium for the percutaneous treatment of symptomatic vertebrobasilar insufficiency for the occasional patient in whom occlusion or tortuosity precludes direct access to the VA.
MeSH term(s)	Aged ; Angioplasty/methods ; Cerebral Angiography ; Female ; Humans ; Stents ; Tomography, X-Ray Computed ; Vertebrobasilar Insufficiency/complications ; Vertebrobasilar Insufficiency/diagnostic imaging ; Vertebrobasilar Insufficiency/surgery
Language	English
Publishing date	2009-03
Publishing country	United States
Document type	Case Reports ; Journal Article
ZDB-ID	3089-2
ISSN	1933-0693 ; 0022-3085
ISSN (online)	1933-0693
ISSN	0022-3085
DOI	10.3171/2008.7.JNS08436
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Article: Use of the 8 French Simmons-2 guide catheter for carotid artery stent placement in patients with difficult aortic arch anatomy.

Chang, Feng-Chi / Tummala, Ramachandra P / Jahromi, Babak S / Samuelson, Rodney M / Siddiqui, Adnan H / Levy, Elad I / Hopkins, L Nelson

Journal of neurosurgery

2009 Volume 110, Issue 3, Page(s) 437–441

Abstract: Inability to achieve vascular access is a common reason for failure to perform carotid artery angioplasty and stent placement. The authors report their experience with the use of an 8 Fr Simmons-2 catheter to gain carotid artery access in the setting of ... ...

Abstract	Inability to achieve vascular access is a common reason for failure to perform carotid artery angioplasty and stent placement. The authors report their experience with the use of an 8 Fr Simmons-2 catheter to gain carotid artery access in the setting of complex aortic arch anatomy. This guide catheter was used successfully to perform carotid artery angioplasty and stent placement in 10 patients with markedly tortuous aortic arches or supra-aortic branches. As the authors gained experience with this catheter, they used it as a first option in patients with the appropriate aortic arch anatomy.
MeSH term(s)	Aged ; Aged, 80 and over ; Angioplasty ; Aorta, Thoracic/anatomy & histology ; Carotid Arteries ; Catheterization ; Female ; Humans ; Male ; Stents
Language	English
Publishing date	2009-03
Publishing country	United States
Document type	Journal Article
ZDB-ID	3089-2
ISSN	1933-0693 ; 0022-3085
ISSN (online)	1933-0693
ISSN	0022-3085
DOI	10.3171/2008.7.17627
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Article ; Online: Rapidly successive, symptomatic, bilateral, spontaneous vertebral artery dissections: treatment with stent reconstruction.

Komotar, Ricardo J / Mocco, J / Samuelson, Rodney M / Tawk, Rabih G / Siddiqui, Adnan H / Levy, Elad I / Hopkins, L Nelson

Surgical neurology

2009 Volume 72, Issue 3, Page(s) 300–305

Abstract: Background: Vertebral artery dissection has been increasingly identified as a cause of ischemic stroke in young adults. This condition is typically secondary to trauma, with spontaneous VA dissection accounting for only a minority of cases. We report ... ...

Abstract	Background: Vertebral artery dissection has been increasingly identified as a cause of ischemic stroke in young adults. This condition is typically secondary to trauma, with spontaneous VA dissection accounting for only a minority of cases. We report the case of a patient with bilateral symptomatic spontaneous VA dissections, presenting in rapid succession. Each ictal event was successfully managed with stent reconstruction and antiplatelet therapy. Case description: A 40-year-old gentleman, with no preceding trauma or apparent inciting event, presented with the acute onset of imbalance, dysarthria, right-sided paresthesias, headache, dysphagia, and dysmetria. Workup revealed a right VA dissection with pseudoaneurysm formation, which was treated with multiple stents. He was scheduled for a 3-week follow-up angiogram and maintained on aspirin and clopidogrel. Three days before his appointment, the patient presented with severe headache and significant worsening of his dysarthria and right-sided dysmetria. Imaging demonstrated a healing right VA pseudoaneurysm, but his left VA was newly dissected with an associated pseudoaneurysm. This lesion was also successfully treated in a similar fashion. The patient did well postoperatively. Follow-up angiography demonstrated excellent vessel patency and pseudoaneurysm stabilization/regression. Conclusion: A case of rapidly successive, symptomatic bilateral VA dissections is presented. Ictal events occurred at separate time points and were successfully managed with stent-reconstruction and antiplatelet therapy. Through reporting our experience, we hope to raise awareness regarding this rare condition in young adults.
MeSH term(s)	Adult ; Blood Vessel Prosthesis Implantation/methods ; Humans ; Male ; Stents ; Treatment Outcome ; Vertebral Artery Dissection/physiopathology ; Vertebral Artery Dissection/surgery
Language	English
Publishing date	2009-09
Publishing country	United States
Document type	Case Reports ; Journal Article
ZDB-ID	221938-4
ISSN	1879-3339 ; 0090-3019
ISSN (online)	1879-3339
ISSN	0090-3019
DOI	10.1016/j.surneu.2008.02.029
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Article: Carbon accumulation in loblolly pine plantations is increased by fertilization across a soil moisture availability gradient

Forest ecology and management. 2018 Sept. 15, v. 424

2018

Abstract: Silvicultural practices, particularly fertilization, may counteract or accentuate the effects of climate change on carbon cycling in planted pine ecosystems, but few studies have empirically assessed the potential effects. In the southeastern United ... ...

Abstract	Silvicultural practices, particularly fertilization, may counteract or accentuate the effects of climate change on carbon cycling in planted pine ecosystems, but few studies have empirically assessed the potential effects. In the southeastern United States, we established a factorial throughfall reduction (D) × fertilization (F) experiment in 2012 in four loblolly pine (Pinus taeda L.) plantations encompassing the climatic range of the species in Florida (FL), Georgia (GA), Oklahoma (OK), and Virginia (VA). Net primary productivity (NPP) was estimated from tree inventories for four consecutive years, and net ecosystem productivity (NEP) as NPP minus heterotrophic respiration (RH). Soil respiration (RS) was measured biweekly-monthly for at least one year at each site and simultaneous measurements of RS & RH were taken five to eight times through the year for at least one year during the experiment. Reducing throughfall by 30% decreased available soil water at the surface and for the 0–90 cm soil profile. Fertilization increased NPP at all sites and D decreased NPP (to a lesser extent) at the GA and OK sites. The F + D treatment did not affect NPP. Mean annual NPP under F ranged from 10.01 ± 0.21 MgC·ha−1·yr−1 at VA (mean ± SE) to 17.20 ± 0.50 MgC·ha−1·yr−1 at FL, while the lowest levels were under the D treatment, ranging from 8.63 ± 0.21 MgC·ha−1·yr−1 at VA to 14.97 ± 0.50 MgC·ha−1·yr−1 at FL. RS and RH were, in general, decreased by F and D with differential responses among sites, leading to NEP increases under F. Throughfall reduction increased NEP at FL and VA due to a negative effect on RH and no effect on NPP. Mean annual NEP ranged from 1.63 ± 0.59 MgC·ha−1·yr−1 in the control at OK to 8.18 ± 0.82 MgC·ha−1·yr−1 under F + D at GA. These results suggest that fertilization will increase NEP under a wide range of climatic conditions including reduced precipitation, but either NPP or RH could be the primary driver because F can increase stand growth, as well as suppress RS and RH. Moreover, D and F never significantly interacted for an annual C flux, potentially simplifying estimates of how fertilization and drought will affect C cycling in these ecosystems.
Keywords	carbon ; carbon cycle ; climate change ; climatic factors ; drought ; ecosystems ; inventories ; net ecosystem production ; Pinus taeda ; plant available water ; plantations ; primary productivity ; silvicultural practices ; soil profiles ; soil respiration ; throughfall ; trees ; Florida ; Georgia ; Oklahoma ; Virginia
Language	English
Dates of publication	2018-0915
Size	p. 39-52.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	751138-3
ISSN	0378-1127
ISSN	0378-1127
DOI	10.1016/j.foreco.2018.04.029
Database	NAL-Catalogue (AGRICOLA)

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