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Hypertension is associated with cardiac noradrenergic hyperactivity, although it is not clear whether this precedes or follows the development of hypertension itself. We hypothesized that Ca(2+) homeostasis in postganglionic sympathetic neurons is impaired in spontaneously hypertensive rats (SHRs) and may occur before the development of hypertension. The depolarization-induced rise in intracellular free calcium concentration ([Ca(2+)](i); measured using fura-2-acetoxymethyl ester) was significantly larger in cultured sympathetic neurons from prehypertensive SHRs than in age matched normotensive Wistar-Kyoto rats. The decay of the [Ca(2+)](i) transient was also faster in SHRs. The endoplasmic reticulum Ca(2+) content and caffeine-induced [Ca(2+)](i) amplitude were significantly greater in the young SHRs. Lower protein levels of phospholamban and more copies of ryanodine receptor mRNA were also observed in the young SHRs. Depleting the endoplasmic reticulum Ca(2+) store did not alter the difference of the evoked [Ca(2+)](i) transient and decay time between young SHRs and Wistar-Kyoto rats. However, removing mitochondrial Ca(2+) buffering abolished these differences. A lower mitochondrial membrane potential was also observed in young SHR sympathetic neurons. This resulted in impaired mitochondrial Ca(2+) uptake and release, which might partly be responsible for the increased [Ca(2+)](i) transient and faster decay in SHR sympathetic neurons. This Ca(2+) phenotype seen in early development in cardiac stellate and superior cervical ganglion neurons may contribute to the sympathetic hyperresponsiveness that precedes the onset of hypertension. 相似文献
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Jayesh Sardhara Sanjay Behari Awadhesh K. Jaiswal Arun Srivastava Rabi Narayan Sahu Anant Mehrotra Shubha Phadke Uttam Singh 《Acta neurochirurgica》2013,155(7):1157-1167
Background
This prospective study attempts to study the clinico-radiological differences between patients with syndromic AAD (SAAD), non-syndromic AAD (NSAAD), and AAD with Klippel–Feil anomaly (AADKFA) that may impact management.Methods
In 46 patients with AAD [SAAD (including Morquio, Down, Larson and Marshall syndrome and achondroplasia; n?=?6); NSAAD(n?=?20); and, AADKFS (n?=?20)], myelopathy was graded as mild (n?=?17, 37 %), moderate (15, 32.5 %) or severe (14, 30.5 %) based on Japanese Orthopaedic Association Score modified for Indian patients (mJOAS). Basilar invagination (BI), basal angle, odontoid hypoplasia, facet-joint angle, effective canal diameter, Ishihara curvature index, and angle of retroversion of odontoid and vertebral artery (VA) variations were also studied.Statistics
Clinico-radiological differences were assessed by Fisher’s exact test, and mean craniometric values by Kruskal–Wallis test (p value ≤?0.05 significant)Results
Incidence of irreducible AAD in SAAD (n?=?0), NSA AD (11.55 %) and AADKFS (n?=?18.90 %) showed significant difference (p?=?0.01). High incidence of kyphoscoliosis (83 %) and odontoid hypoplasia (83 %) in SAAD, and assimilated atlas and BI in NSAAD and AADKFA groups were found. In AADKFA, effective canal diameter was significantly reduced(p?=?0.017) with increased Ishihara index and increased angle of odontoid retroversion; 61 % patients had VA variations. Thirty-five patients underwent single-stage transoral decompression with posterior fusion (for irreducible AAD) or direct posterior stabilization (for reducible AAD). Postoperative mJOAS evaluation often revealed persistent residual myelopathy despite clinical improvement.Conclusions
Myelopathy is induced by recurrent cord trauma due to reducible AAD in SAAD, and compromised cervicomedullary canal diameter in NSAAD and AADKFA. SAAD in children may be missed due to incomplete odontoid ossification or coexisting angular deformities. In AADKFA, decisions regarding vertebral levels to be included in posterior stabilization should take into consideration intact intervening motion segments and compensatory cervical hyperlordosis. Following VA injury, endovascular primary vessel occlusion/stenting across pseudoaneurysm preempts delayed rehemorrhage. 相似文献24.
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Patient‐specific pharmacokinetic parameter estimation on dynamic contrast‐enhanced MRI of prostate: Preliminary evaluation of a novel AIF‐free estimation method 下载免费PDF全文
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Tirotta Fabio Fadel Michael G. Hodson James Parente Alessandro Wilkerson Helene Almond L. Max Ford Samuel J. Hayes Andrew J. Desai Anant Strauss Dirk C. 《Annals of surgical oncology》2022,29(12):7320-7330
Annals of Surgical Oncology - As the population ages, more elderly patients are receiving surgery for retroperitoneal sarcoma (RPS). However, high-quality data investigating associations between... 相似文献
28.
Tseng William W. Swallow Carol J. Strauss Dirk C. Bonvalot Sylvie Rutkowski Piotr Ford Samuel J. Gonzalez Ricardo J. Gladdy Rebecca A. Gyorki David E. Fairweather Mark Lee Kyo Won Albertsmeier Markus van Houdt Winan J. Fau Magalie Nessim Carolyn Grignani Giovanni Cardona Kenneth Quagliuolo Vittorio Grignol Valerie Farma Jeffrey M. Pennacchioli Elisabetta Fiore Marco Hayes Andrew Tzanis Dimitri Skoczylas Jacek Almond Max L. Mullinax John E. Johnston Wendy Snow Hayden Haas Rick L. Callegaro Dario Smith Myles J. Bouhadiba Toufik Desai Anant Voss Rachel Sanfilippo Roberta Jones Robin L. Baldini Elizabeth H. Wagner Andrew J. Catton Charles N. Stacchiotti Silvia Thway Khin Roland Christina L. Raut Chandrajit P. Gronchi Alessandro 《Annals of surgical oncology》2022,29(12):7335-7348
Annals of Surgical Oncology - Surgery is the mainstay of treatment for retroperitoneal sarcoma (RPS), but local recurrence is common. Biologic behavior and recurrence patterns differ significantly... 相似文献
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Amit Kavimandan Meenakshi Sharma Anil K. Verma Prasenjit Das Prabhash Mishra Sanjeev Sinha Anant Mohan V. Sreenivas Siddhartha Datta Gupta Govind K. Makharia 《Indian journal of gastroenterology》2014,33(2):114-118