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Boudreau MW, Tonogai EJ, Schane CP, Xi MX, Fischer JH, Vijayakumar J, Ji Y, Tarasow TM, Fan TM, Hergenrother PJ, Dudek AZ. The combination of PAC-1 and entrectinib for the treatment of metastatic uveal melanoma. Melanoma Res 2023; 33:514-524. [PMID: 37738028 PMCID: PMC10615773 DOI: 10.1097/cmr.0000000000000927] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/23/2023]
Abstract
The treatment of metastatic uveal melanoma remains a major clinical challenge. Procaspase-3, a proapoptotic protein and precursor to the key apoptotic executioner caspase-3, is overexpressed in a wide range of malignancies, and the drug PAC-1 leverages this overexpression to selectively kill cancer cells. Herein, we investigate the efficacy of PAC-1 against uveal melanoma cell lines and report the synergistic combination of PAC-1 and entrectinib. This preclinical activity, tolerability data in mice, and the known clinical effectiveness of these drugs in human cancer patients led to a small Phase 1b study in patients with metastatic uveal melanoma. The combination of PAC-1 and entrectinib was tolerated with no treatment-related grade ≥3 toxicities in these patients. The pharmacokinetics of entrectinib were not affected by PAC-1 treatment. In this small and heavily pretreated initial cohort, stable disease was observed in four out of six patients, with a median progression-free survival of 3.38 months (95% CI 1.6-6.5 months). This study is an initial demonstration that the combination of PAC-1 and entrectinib may warrant further clinical investigation. Clinical trial registration: Clinical Trials.gov: NCT04589832.
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Affiliation(s)
- Matthew W. Boudreau
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
- Carl R. Woese Institute for Genomic Biology University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Emily J. Tonogai
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
- Carl R. Woese Institute for Genomic Biology University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Claire P. Schane
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
- Carl R. Woese Institute for Genomic Biology University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Min X. Xi
- HealthPartners Institute, Minneapolis, MN, USA
| | - James H. Fischer
- Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, Chicago, IL, USA
| | | | - Yan Ji
- HealthPartners Institute, Minneapolis, MN, USA
| | | | - Timothy M. Fan
- Carl R. Woese Institute for Genomic Biology University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
- Vanquish Oncology, Inc, Champaign, IL
- Cancer Center at Illinois, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
- Department of Veterinary Clinical Medicine, University of Illinois at Urbana-Champaign, Urbana, IL, 61802 USA
| | - Paul J. Hergenrother
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
- Carl R. Woese Institute for Genomic Biology University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
- Vanquish Oncology, Inc, Champaign, IL
- Cancer Center at Illinois, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Arkadiusz Z. Dudek
- HealthPartners Institute, Minneapolis, MN, USA
- Vanquish Oncology, Inc, Champaign, IL
- Division of Hematology, Oncology and Transplantation, University of Minnesota, Minneapolis, MN, USA
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2
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Danciu OC, Holdhoff M, Peterson RA, Fischer JH, Liu LC, Wang H, Venepalli NK, Chowdhery R, Nicholas MK, Russell MJ, Fan TM, Hergenrother PJ, Tarasow TM, Dudek AZ. Phase I study of procaspase-activating compound-1 (PAC-1) in the treatment of advanced malignancies. Br J Cancer 2023; 128:783-792. [PMID: 36470974 PMCID: PMC9977881 DOI: 10.1038/s41416-022-02089-7] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 11/18/2022] [Accepted: 11/22/2022] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Procaspase-3 (PC-3) is overexpressed in multiple tumour types and procaspase-activating compound 1 (PAC-1) directly activates PC-3 and induces apoptosis in cancer cells. This report describes the first-in-human, phase I study of PAC-1 assessing maximum tolerated dose, safety, and pharmacokinetics. METHODS Modified-Fibonacci dose-escalation 3 + 3 design was used. PAC-1 was administered orally at 7 dose levels (DL) on days 1-21 of a 28-day cycle. Dose-limiting toxicity (DLT) was assessed during the first two cycles of therapy, and pharmacokinetics analysis was conducted on days 1 and 21 of the first cycle. Neurologic and neurocognitive function (NNCF) tests were performed throughout the study. RESULTS Forty-eight patients were enrolled with 33 completing ≥2 cycles of therapy and evaluable for DLT. DL 7 (750 mg/day) was established as the recommended phase 2 dose, with grade 1 and 2 neurological adverse events noted, while NNCF testing showed stable neurologic and cognitive evaluations. PAC-1's t1/2 was 28.5 h after multi-dosing, and systemic drug exposures achieved predicted therapeutic concentrations. PAC-1 clinical activity was observed in patients with neuroendocrine tumour (NET) with 2/5 patients achieving durable partial response. CONCLUSIONS PAC-1 dose at 750 mg/day was recommended for phase 2 studies. Activity of PAC-1 in treatment-refractory NET warrants further investigation. CLINICAL TRIAL REGISTRATION Clinical Trials.gov: NCT02355535.
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Affiliation(s)
- Oana C Danciu
- Division of Hematology/Oncology, Department of Medicine, University of Illinois at Chicago, Chicago, IL, USA.
- Clinical Trials Office, University of Illinois Cancer Center, University of Illinois at Chicago, Chicago, IL, USA.
| | - Matthias Holdhoff
- The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD, USA
| | | | - James H Fischer
- Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, Chicago, IL, USA
| | - Li C Liu
- Division of Epidemiology and Biostatistics, School of Public Health, University of Illinois at Chicago, Chicago, IL, USA
| | - Heng Wang
- Division of Epidemiology and Biostatistics, School of Public Health, University of Illinois at Chicago, Chicago, IL, USA
| | - Neeta K Venepalli
- Division of Hematology/Oncology, Department of Medicine, University of Illinois at Chicago, Chicago, IL, USA
| | - Rozina Chowdhery
- Division of Hematology/Oncology, Department of Medicine, University of Illinois at Chicago, Chicago, IL, USA
| | - M Kelly Nicholas
- Division of Hematology/Oncology, Department of Medicine, University of Illinois at Chicago, Chicago, IL, USA
| | - Meredith J Russell
- Clinical Trials Office, University of Illinois Cancer Center, University of Illinois at Chicago, Chicago, IL, USA
| | - Timothy M Fan
- Vanquish Oncology, Inc., Champaign, IL, USA
- Department of Veterinary Clinical Medicine, University of Illinois, Urbana-Champaign, IL, USA
- Cancer Center at Illinois, Urbana-Champaign, IL, USA
- Institute for Genomic Biology, University of Illinois, Urbana-Champaign, IL, USA
| | - Paul J Hergenrother
- Vanquish Oncology, Inc., Champaign, IL, USA
- Cancer Center at Illinois, Urbana-Champaign, IL, USA
- Institute for Genomic Biology, University of Illinois, Urbana-Champaign, IL, USA
- Department of Chemistry, University of Illinois, Urbana-Champaign, IL, USA
| | | | - Arkadiusz Z Dudek
- HealthPartners Institute, Regions Cancer Care Center, St. Paul, MN, USA
- Vanquish Oncology, Inc., Champaign, IL, USA
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3
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Holdhoff M, Nicholas MK, Peterson RA, Maraka S, Liu LC, Fischer JH, Wefel JS, Fan TM, Vannorsdall T, Russell M, Iacoboni M, Tarasow TM, Hergenrother PJ, Dudek AZ, Danciu OC. Phase I dose-escalation study of procaspase-activating compound-1 in combination with temozolomide in patients with recurrent high-grade astrocytomas. Neurooncol Adv 2023; 5:vdad087. [PMID: 37554223 PMCID: PMC10406430 DOI: 10.1093/noajnl/vdad087] [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] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/10/2023] Open
Abstract
BACKGROUND Procaspase-3 (PC-3) is overexpressed in various tumor types, including gliomas. Targeted PC-3 activation combined with chemotherapy is a novel strategy for treating patients with high-grade gliomas, with promising preclinical activity. This study aimed to define safety and tolerability of procaspase-activating compound-1 (PAC-1) in combination with temozolomide (TMZ) for patients with recurrent high-grade astrocytomas. METHODS A modified-Fibonacci dose-escalation 3 + 3 design was used. PAC-1 was administered at increasing dose levels (DL; DL1 = 375 mg) on days 1-21, in combination with TMZ 150 mg/m2/5 days, per 28-day cycle. Dose-limiting toxicity was assessed during the first 2 cycles. Neurocognitive function (NCF) testing was conducted throughout the study. RESULTS Eighteen patients were enrolled (13 GBM, IDH-wild type; 2 astrocytoma, IDH-mutant, grade 3; 3 astrocytoma, IDH-mutant, grade 4). Dose escalation was discontinued after DL3 (ie, PAC-1, 625 mg) due to lack of additional funding. Grade 3 toxicity was observed in 1 patient at DL1 (elevated liver transaminases) and 1 at DL 2 (headache). Two partial responses were observed at DL1 in patients with GBM, O6-methylguanine-DNA methyltransferase (MGMT) promoter methylated. Two patients had stable disease, and 11 experienced progression. NCF testing did not show a clear relationship between PAC-1 dose, treatment duration, and declines in NCF. CONCLUSIONS Combination of PAC-1 and TMZ was well tolerated up to 625 mg orally daily and TMZ orally 150 mg/m2/5 days per 28-day cycle. The maximum tolerated dose was not reached. Further dose escalation of PAC-1 in combination with TMZ is advised before conducting a formal prospective efficacy study in this patient population.
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Affiliation(s)
- Matthias Holdhoff
- Department of Oncology, Johns Hopkins University School of Medicine, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, Maryland, USA
| | - M Kelly Nicholas
- Department of Neurology and Rehabilitation, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Richard A Peterson
- HealthPartners Institute, Regions Cancer Care Center, St. Paul, Minnesota, USA
| | - Stefania Maraka
- Department of Neurology and Rehabilitation, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Li C Liu
- Division of Epidemiology and Biostatistics, School of Public Health, University of Illinois at Chicago, Chicago, Illinois, USA
| | - James H Fischer
- Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Jeffrey S Wefel
- Department of Neuro-Oncology, MD Anderson Cancer Center, Houston, Texas, USA
| | - Timothy M Fan
- Vanquish Oncology, Inc., Champaign, Illinois, USA
- Department of Veterinary Clinical Medicine, University of Illinois, Urbana-Champaign, Illinois, USA
- Cancer Center at Illinois, Urbana-Champaign, Illinois, USA
| | - Tracy Vannorsdall
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Meredith Russell
- Clinical Trials Office, University of Illinois Cancer Center, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Michaella Iacoboni
- Department of Oncology, Johns Hopkins University School of Medicine, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, Maryland, USA
| | - Theodore M Tarasow
- Vanquish Oncology, Inc., Champaign, Illinois, USA
- Institute for Genomic Biology, University of Illinois, Urbana-Champaign, Illinois, USA
| | - Paul J Hergenrother
- Vanquish Oncology, Inc., Champaign, Illinois, USA
- Cancer Center at Illinois, Urbana-Champaign, Illinois, USA
- Institute for Genomic Biology, University of Illinois, Urbana-Champaign, Illinois, USA
- Department of Chemistry, University of Illinois, Urbana-Champaign, Illinois, USA
| | - Arkadiusz Z Dudek
- HealthPartners Institute, Regions Cancer Care Center, St. Paul, Minnesota, USA
- Vanquish Oncology, Inc., Champaign, Illinois, USA
- Division of Hematology, Oncology and Transplantation, University of Minnesota, Minneapolis, Minnesota, USA
| | - Oana C Danciu
- Clinical Trials Office, University of Illinois Cancer Center, University of Illinois at Chicago, Chicago, Illinois, USA
- Division of Hematology/Oncology, Department of Medicine, University of Illinois at Chicago, Chicago, Illinois, USA
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4
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Fischer JH, Wittmer HU, Kenup CF, Parker KA, Cole R, Debski I, Taylor GA, Ewen JG, Armstrong DP. Predicting harvest impact and establishment success when translocating highly mobile and endangered species. J Appl Ecol 2022. [DOI: 10.1111/1365-2664.14219] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- JH Fischer
- School of Biological Sciences Victoria University of Wellington New Zealand
- Aquatic Unit Department of Conservation Wellington
| | - HU Wittmer
- School of Biological Sciences Victoria University of Wellington New Zealand
| | - CF Kenup
- Wildlife Ecology Group Massey University Palmerston North New Zealand
| | | | - R Cole
- Murihiku District Office Department of Conservation Invercargill
| | - I Debski
- Aquatic Unit Department of Conservation Wellington
| | - GA Taylor
- Aquatic Unit Department of Conservation Wellington
| | - JG Ewen
- Institute of Zoology Zoological Society of London London UK
| | - DP Armstrong
- Wildlife Ecology Group Massey University Palmerston North New Zealand
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5
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McCully CL, Cruz R, Lyubimov AV, Zakharov AD, Fischer JH, Hergenrother PJ, Warren KE. EXTH-57. PLASMA AND CEREBROSPINAL FLUID PHARMACOKINETICS OF THE PROCASPASE-ACTIVATING COMPOUND, PAC-1, FOLLOWING ORAL ADMINISTRATION IN A NON-HUMAN PRIMATE MODEL. Neuro Oncol 2018. [DOI: 10.1093/neuonc/noy148.405] [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] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | - Rafael Cruz
- Leidos Biomedical Research Inc.,, Bethesda, MD, USA
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6
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Desai P, Nasa P, Soo J, Jia C, Berbaum ML, Fischer JH, Johnson TP. Effects of Regulatory Support Services on Institutional Review Board Turnaround Times. J Empir Res Hum Res Ethics 2017; 12:131-139. [PMID: 28412874 PMCID: PMC5546085 DOI: 10.1177/1556264617704294] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We evaluated how regulatory support services provided by University of Illinois at Chicago's Center for Clinical and Translational Science may reduce Institutional Review Board (IRB) turnaround times. IRB applications were categorized by receipt of any regulatory support and amount of support received. Turnaround time included total turnaround time, time for IRB review, and time for investigators to modify protocols. There were no differences in any turnaround times for supported versus nonsupported applications. However, for supported applications, those receiving more intensive support had total turnaround times 16.0 days ( SE 7.62, p < .05) faster than those receiving less intensive support. Receiving higher regulatory support may be associated with faster approval of IRB submissions.
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Affiliation(s)
- Pankaja Desai
- Alliance of Chicago Community Health Services, L3C (USA)
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7
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Welch MJ, Lally R, Miller JE, Pittman S, Brodsky L, Caplan AL, Uhlenbrauck G, Louzao DM, Fischer JH, Wilfond B. The ethics and regulatory landscape of including vulnerable populations in pragmatic clinical trials. Clin Trials 2015. [PMID: 26374681 DOI: 10.1177/174074515597701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Policies have been developed to protect vulnerable populations in clinical research, including the US federal research regulations (45 Code of Federal Regulations 46 Subparts B, C, and D). These policies generally recognize vulnerable populations to include pregnant women, fetuses, neonates, children, prisoners, persons with physical handicaps or mental disabilities, and disadvantaged persons. The aim has been to protect these populations from harm, often by creating regulatory and ethical checks that may limit their participation in many clinical trials. The recent increase in pragmatic clinical trials raises at least two questions about this approach. First, is exclusion itself a harm to vulnerable populations, as these groups may be denied access to understanding how health interventions work for them in clinical settings? Second, are groups considered vulnerable in traditional clinical trials also vulnerable in pragmatic clinical trials? We argue first that excluding vulnerable subjects from participation in pragmatic clinical trials can be harmful by preventing acquisition of data to meaningfully inform clinical decision-making in the future. Second, we argue that protections for vulnerable subjects in traditional clinical trial settings may not be translatable, feasible, or even ethical to apply in pragmatic clinical trials. We conclude by offering specific recommendations for appropriately protecting vulnerable research subjects in pragmatic clinical trials, focusing on pregnant women, fetuses, neonates, children, prisoners, persons with physical handicaps or mental disabilities, and disadvantaged persons.
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Affiliation(s)
- Mary Jane Welch
- Human Subjects' Protection, College of Nursing, Rush University Medical Center, Chicago, IL, USA
| | - Rachel Lally
- Columbia University Medical Center, New York, NY, USA
| | - Jennifer E Miller
- Kenan Institute for Ethics, Duke University, Durham, NC, USA Edmond J. Safra Center for Ethics, Harvard University, Cambridge, MA, USA Division of Medical Ethics, NYU Langone Medical Center, New York, NY, USA
| | - Stephanie Pittman
- Human Subjects' Protection, Rush University Medical Center, Chicago, IL, USA
| | - Lynda Brodsky
- Cook County Health & Hospitals System, Chicago, IL, USA
| | - Arthur L Caplan
- Division of Medical Ethics, NYU Langone Medical Center, New York, NY, USA
| | - Gina Uhlenbrauck
- Duke Clinical Research Institute, Duke University, Durham, NC, USA
| | - Darcy M Louzao
- Duke Clinical Research Institute, Duke University, Durham, NC, USA
| | | | - Benjamin Wilfond
- Treuman Katz Center for Pediatric Bioethics, Seattle Children's Hospital, Seattle, WA, USA Division of Bioethics, Department of Pediatrics, University of Washington School of Medicine, Seattle, WA, USA
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8
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Welch MJ, Lally R, Miller JE, Pittman S, Brodsky L, Caplan AL, Uhlenbrauck G, Louzao DM, Fischer JH, Wilfond B. The ethics and regulatory landscape of including vulnerable populations in pragmatic clinical trials. Clin Trials 2015; 12:503-10. [PMID: 26374681 DOI: 10.1177/1740774515597701] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [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: 11/16/2022]
Abstract
Policies have been developed to protect vulnerable populations in clinical research, including the US federal research regulations (45 Code of Federal Regulations 46 Subparts B, C, and D). These policies generally recognize vulnerable populations to include pregnant women, fetuses, neonates, children, prisoners, persons with physical handicaps or mental disabilities, and disadvantaged persons. The aim has been to protect these populations from harm, often by creating regulatory and ethical checks that may limit their participation in many clinical trials. The recent increase in pragmatic clinical trials raises at least two questions about this approach. First, is exclusion itself a harm to vulnerable populations, as these groups may be denied access to understanding how health interventions work for them in clinical settings? Second, are groups considered vulnerable in traditional clinical trials also vulnerable in pragmatic clinical trials? We argue first that excluding vulnerable subjects from participation in pragmatic clinical trials can be harmful by preventing acquisition of data to meaningfully inform clinical decision-making in the future. Second, we argue that protections for vulnerable subjects in traditional clinical trial settings may not be translatable, feasible, or even ethical to apply in pragmatic clinical trials. We conclude by offering specific recommendations for appropriately protecting vulnerable research subjects in pragmatic clinical trials, focusing on pregnant women, fetuses, neonates, children, prisoners, persons with physical handicaps or mental disabilities, and disadvantaged persons.
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Affiliation(s)
- Mary Jane Welch
- Human Subjects' Protection, College of Nursing, Rush University Medical Center, Chicago, IL, USA
| | - Rachel Lally
- Columbia University Medical Center, New York, NY, USA
| | - Jennifer E Miller
- Kenan Institute for Ethics, Duke University, Durham, NC, USA Edmond J. Safra Center for Ethics, Harvard University, Cambridge, MA, USA Division of Medical Ethics, NYU Langone Medical Center, New York, NY, USA
| | - Stephanie Pittman
- Human Subjects' Protection, Rush University Medical Center, Chicago, IL, USA
| | - Lynda Brodsky
- Cook County Health & Hospitals System, Chicago, IL, USA
| | - Arthur L Caplan
- Division of Medical Ethics, NYU Langone Medical Center, New York, NY, USA
| | - Gina Uhlenbrauck
- Duke Clinical Research Institute, Duke University, Durham, NC, USA
| | - Darcy M Louzao
- Duke Clinical Research Institute, Duke University, Durham, NC, USA
| | | | - Benjamin Wilfond
- Treuman Katz Center for Pediatric Bioethics, Seattle Children's Hospital, Seattle, WA, USA Division of Bioethics, Department of Pediatrics, University of Washington School of Medicine, Seattle, WA, USA
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9
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Fischer JH, Sarto GE, Hardman J, Endres L, Jenkins TM, Kilpatrick SJ, Jeong H, Geller S, Deyo K, Fischer PA, Rodvold KA. Influence of gestational age and body weight on the pharmacokinetics of labetalol in pregnancy. Clin Pharmacokinet 2014; 53:373-83. [PMID: 24297680 PMCID: PMC4310214 DOI: 10.1007/s40262-013-0123-0] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND AND OBJECTIVES Labetalol is frequently prescribed for the treatment of hypertension during pregnancy; however, the influence of pregnancy on labetalol pharmacokinetics is uncertain, with inconsistent findings reported by previous studies. This study examined the population pharmacokinetics of oral labetalol during and after pregnancy in women receiving labetalol for hypertension. METHODS Data were collected from 57 women receiving the drug for hypertension from the 12th week of pregnancy through 12 weeks postpartum using a prospective, longitudinal design. A sparse sampling strategy guided collection of plasma samples. Samples were assayed for labetalol by high-performance liquid chromatography. Estimation of population pharmacokinetic parameters and covariate effects was performed by nonlinear mixed effects modeling using NONMEM. The final population model was validated by bootstrap analysis and visual predictive check. Simulations were performed with the final model to evaluate the appropriate body weight to guide labetalol dosing. RESULTS Lean body weight (LBW) and gestational age, i.e. weeks of pregnancy, were identified as significantly influencing oral clearance (CL/F) of labetalol, with CL/F ranging from 1.4-fold greater than postpartum values at 12 weeks' gestational age to 1.6-fold greater at 40 weeks. Doses adjusted for LBW provide more consistent drug exposure than doses adjusted for total body weight. The apparent volumes of distribution for the central compartment and at steady-state were 1.9-fold higher during pregnancy. CONCLUSIONS Gestational age and LBW impact the pharmacokinetics of labetalol during pregnancy and have clinical implications for adjusting labetalol doses in these women.
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Affiliation(s)
- James H Fischer
- Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, 833 S Wood Street, Room 164, Chicago, IL, 60612, USA,
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10
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Fischer JH, Sarto GE, Habibi M, Kilpatrick SJ, Tuomala RE, Shier JM, Wollett L, Fischer PA, Khorana KS, Rodvold KA. Influence of body weight, ethnicity, oral contraceptives, and pregnancy on the pharmacokinetics of azithromycin in women of childbearing age. Antimicrob Agents Chemother 2012; 56:715-24. [PMID: 22106226 PMCID: PMC3264225 DOI: 10.1128/aac.00717-11] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Accepted: 11/16/2011] [Indexed: 11/20/2022] Open
Abstract
Women of childbearing age commonly receive azithromycin for the treatment of community-acquired infections, including during pregnancy. This study determined azithromycin pharmacokinetics in pregnant and nonpregnant women and identified covariates contributing to pharmacokinetic variability. Plasma samples were collected by using a sparse-sampling strategy from pregnant women at a gestational age of 12 to 40 weeks and from nonpregnant women of childbearing age receiving oral azithromycin for the treatment of an infection. Pharmacokinetic data from extensive sampling conducted on 12 healthy women were also included. Plasma samples were assayed for azithromycin by high-performance liquid chromatography. Population data were analyzed by nonlinear mixed-effects modeling. The population analysis included 53 pregnant and 25 nonpregnant women. A three-compartment model with first-order absorption and a lag time provided the best fit of the data. Lean body weight, pregnancy, ethnicity, and the coadministration of oral contraceptives were covariates identified as significantly influencing the oral clearance of azithromycin and, except for oral contraceptive use, intercompartmental clearance between the central and second peripheral compartments. No other covariate relationships were identified. Compared to nonpregnant women not receiving oral contraceptives, a 21% to 42% higher dose-adjusted azithromycin area under the plasma concentration-time curve (AUC) occurred in non-African American women who were pregnant or receiving oral contraceptives. Conversely, azithromycin AUCs were similar between pregnant African American women and nonpregnant women not receiving oral contraceptives. Although higher levels of maternal and fetal azithromycin exposure suggest that lower doses be administered to non-African American women during pregnancy, the consideration of azithromycin pharmacodynamics during pregnancy should guide any dose adjustments.
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Affiliation(s)
- James H. Fischer
- Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Gloria E. Sarto
- Department of Obstetrics and Gynecology, School of Medicine and Public Health, University of Wisconsin—Madison, and University of Wisconsin Obstetrics Service, Meriter Hospital, Madison, Wisconsin, USA
| | - Mitra Habibi
- Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Sarah J. Kilpatrick
- Department of Obstetrics and Gynecology, College of Medicine, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Ruth E. Tuomala
- Department of Obstetrics and Gynecology, Brigham & Women's Hospital, Harvard University School of Medicine, Boston, Massachusetts, USA
| | - Janice M. Shier
- Department of Obstetrics and Gynecology, College of Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Lori Wollett
- Office of Clinical Trials, University of Wisconsin—Madison, and School of Medicine and Public Health, University of Wisconsin—Madison, Madison, Wisconsin, USA
| | - Patricia A. Fischer
- Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Kinnari S. Khorana
- Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Keith A. Rodvold
- Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois, USA
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11
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Della Torre M, Hibbard JU, Jeong H, Fischer JH. Betamethasone in pregnancy: influence of maternal body weight and multiple gestation on pharmacokinetics. Am J Obstet Gynecol 2010; 203:254.e1-12. [PMID: 20816148 PMCID: PMC4326076 DOI: 10.1016/j.ajog.2010.06.029] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2010] [Revised: 05/04/2010] [Accepted: 06/14/2010] [Indexed: 11/17/2022]
Abstract
OBJECTIVE The goals of the study were to estimate the pharmacokinetic parameters of standard dose betamethasone in a large obstetrics population and evaluate the effect of maternal body size and multiple gestation on the pharmacokinetic parameters and their observed variability. STUDY DESIGN This was a prospective pharmacokinetic study. Liquid chromatography mass spectrometry was used to measure betamethasone plasma concentrations. Pharmacokinetic parameters and significant clinical covariates were estimated with mixed effect modeling. Bootstrap analysis confirmed validity of the model. RESULTS Two hundred seventy-four blood samples from 77 patients were obtained. The greatest effect on pharmacokinetic variability was observed with maternal lean body weight (LBW). The relationship between the pharmacokinetic parameters and LBW remained linear over a wide range of maternal body sizes. Multiple gestations did not affect the pharmacokinetic parameters. CONCLUSION Individualization of betamethasone dosing by maternal LBW reduces variability in drug exposure. Mutiple gestations do not require betamethasone dosing adjustment, because pharmacokinetics are the same as singleton gestations.
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Affiliation(s)
- Micaela Della Torre
- Division of Maternal Fetal Medicine, Department of Obstetric and Gynecology, University of Illinois at Chicago, Chicago, IL, USA.
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Bangard C, Rösgen S, Wahba R, Hellmich M, Wiemker R, Fischer JH, Stippel DL, Lackner KJ. Perkutane intrahepatische RF Ablation im Schweinemodell: erste Ergebnisse mit der Rita XLi Sonde. ROFO-FORTSCHR RONTG 2010. [DOI: 10.1055/s-0030-1252775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Bangard C, Rösgen S, Wahba R, Hellmich M, Wiemker R, Fischer JH, Stippel DL, Lackner KJ. Monopolare RFA in Schweinelebern: Methode zur in vivo Bestimmung der Asymmetrie von Nekrosezonen im Verhältnis zur Applikatorschaftachse. ROFO-FORTSCHR RONTG 2010. [DOI: 10.1055/s-0030-1252797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Fischer UM, Klass O, Cox CS, Stock U, Antonyan A, Brixius K, Fischer JH, Mehlhorn U, Bloch W. Regulation of endothelial nitric oxide synthase (eNOS) in myocardium subjected to cardioplegic arrest. Thorac Cardiovasc Surg 2009; 57:379-85. [PMID: 19795322 DOI: 10.1055/s-0029-1185873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
BACKGROUND Nitric oxide (NO) production by both coronary endothelial cells and cardiomyocytes is thought to play a significant role in myocardial pathophysiology following ischemia/reperfusion (I/R). METHODS In thirteen pigs subjected to 1 hour cardioplegic arrest (CA) on CPB, left ventricular (LV) biopsies were collected prior to CPB (baseline), at 60 min CPA, at 15 and 30 min reperfusion on CPB, and at 120 min post CPB. LV specimens were immunocytochemically stained against phospho-eNOS (Ser1177), phospho-eNOS (Thr495), phosphorylated ERK1/2, and AKT/PKB. Four additional pigs without CA served as controls. Cardiomyocytes were quantitatively investigated using TV densitometry (gray units: U). RESULTS After 60 min CA phosphorylation of eNOS (Ser1177) increased significantly and remained elevated until 30 min of reperfusion. In contrast, eNOS (Thr495) phosphorylation remained unchanged during CA and throughout reperfusion. In control animals, eNOS phosphorylation remained unchanged. Akt/PKB activity significantly increased after 60 min CA and decreased thereafter. ERK1/2 activity remained unchanged during ischemia but increased during reperfusion. CONCLUSIONS ENOS activation during ischemia occurs through phosphorylation at Ser1177 mediated by Akt/PKB. ERK1/2 does not seem to be involved in myocardial eNOS regulation especially not via phosphorylation at eNOS (Thr495).
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Affiliation(s)
- U M Fischer
- Pediatric Surgery, University of Texas Medical School at Houston, Houston, Texas, United States of America
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Dagtekin O, Gerbershagen HJ, Özgür E, Gaertner J, Fischer JH. Effects of Thiopental on Endothelium-Dependent Relaxation in Porcine Coronary Arteries. J Int Med Res 2009; 37:1011-7. [DOI: 10.1177/147323000903700405] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
This study investigated the effects of thiopental on endothelium-dependent relaxation (EDR), and especially the effects on nitric oxide-and prostacyclin-independent EDR. Fresh porcine coronary artery rings (4 mm long), were consecutively tested with and without 20 μg/ml thiopental in Krebs–Henseleit solution. Indomethacin (10 μmol/1) was used in all experiments to eliminate prostacyclin effects. Prostaglandin F2α (10 μmol/l) was used to induce contractions and bradykinin (10−10−10−5 M) was used to induce EDR. Experiments were also carried out using 300 μmol/1 N-nitro-l-arginine to block nitric oxide production and to assess the influence of thiopental on nitric oxide-and prostacyclin-independent EDR. Thiopental induced statistically significant increases in EDR at concentrations of 10−6−10−5 M bradykinin. Following nitric oxide production block, thiopental significantly reduced the relaxation response at concentrations of 10−8−10−5 M bradykinin. At a clinically relevant concentration of 20 μg/ml thiopental, a significant increase in EDR and a significant reduction in nitric oxide-and prostacyclin-independent relaxation was observed in porcine epicardial coronary arteries.
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Affiliation(s)
- O Dagtekin
- Department of Anaesthesiology and Intensive Care Medicine, University of Cologne, Cologne, Germany
| | - HJ Gerbershagen
- Department of Anaesthesiology and Intensive Care Medicine, University of Cologne, Cologne, Germany
| | - E Özgür
- Department of Urology, University of Cologne, Cologne, Germany
| | - J Gaertner
- Department of Palliative Care, University of Cologne, Cologne, Germany
| | - JH Fischer
- nstitute of Experimental Medicine, University of Cologne, Cologne, Germany
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Chen H, Yang K, Choi S, Fischer JH, Jeong H. Up-regulation of UDP-glucuronosyltransferase (UGT) 1A4 by 17beta-estradiol: a potential mechanism of increased lamotrigine elimination in pregnancy. Drug Metab Dispos 2009; 37:1841-7. [PMID: 19546240 DOI: 10.1124/dmd.109.026609] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Oral clearance of lamotrigine, an antiepileptic drug commonly used in pregnant women, is increased in pregnancy by unknown mechanisms. In this study, we show that 17beta-estradiol (E(2)) up-regulates expression of UDP glucuronosyltransferase (UGT) 1A4, the major enzyme responsible for elimination of lamotrigine. Endogenous mRNA expression levels of UGT1A4 in estrogen receptor (ER) alpha-negative HepG2 cells were induced 2.3-fold by E(2) treatment in the presence of ER alpha expression. E(2) enhanced transcriptional activity of UGT1A4 in a concentration-dependent manner in HepG2 cells when ER alpha was cotransfected. Induction of UGT1A4 transcriptional activity by E(2) was also observed in ER alpha-positive MCF7 cells, which was abrogated by pretreatment with the antiestrogen fulvestrant (ICI 182,780). Analysis of UGT1A4 upstream regions using luciferase reporter assays identified a putative specificity protein-1 (Sp1) binding site (-1906 to -1901 base pairs) that is critical for the induction of UGT1A4 transcriptional activity by E(2). Deletion of the Sp1 binding sequence abolished the UGT1A4 up-regulation by E(2), and Sp1 bound to the putative Sp1 binding site as determined by a electrophoretic mobility shift assay. Analysis of ER alpha domains using ER alpha mutants revealed that the activation function (AF) 1 and AF2 domains but not the DNA binding domain of ER alpha are required for UGT1A4 induction by E(2) in HepG2 cells. Finally, E(2) treatment increased lamotrigine glucuronidation in ER alpha-transfected HepG2 cells. Together, our data indicate that up-regulation of UGT1A4 expression by E(2) is mediated by both ER alpha and Sp1 and is a potential mechanism contributing to the enhanced elimination of lamotrigine in pregnancy.
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Affiliation(s)
- Huiqing Chen
- Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, 833 S. Wood St., Chicago, IL 60612, USA
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Haldenwang PL, Strauch JT, Müllem K, Schmalz M, Fischer JH, Wahlers T. Regional distribution of cerebral blood flow during antegrade selective cerebral perfusion. Thorac Cardiovasc Surg 2009. [DOI: 10.1055/s-0029-1191562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Jeong H, Choi S, Song JW, Chen H, Fischer JH. Regulation of UDP-glucuronosyltransferase (UGT) 1A1 by progesterone and its impact on labetalol elimination. Xenobiotica 2008; 38:62-75. [PMID: 18098064 DOI: 10.1080/00498250701744633] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The authors recently reported the increased oral clearance of labetalol in pregnant women. To elucidate the mechanism of the elevated oral clearance, it was hypothesized that female hormones, at the high concentrations attainable during pregnancy, enhance hepatic metabolism of labetalol. Labetalol glucuronidation, which is the major elimination pathway of labetalol, was characterized by screening six recombinant human UGTs (UGT1A1, 1A4, 1A6, 1A9, 2B4, and 2B7) for their capacity to catalyse labetalol glucuronidation. The effect of female hormones (progesterone, oestradiol, oestriol, or oestrone) on the promoter activities of relevant UDP glucuronosyltransferases (UGT) was investigated using a luciferase reporter assay in HepG2 cells. The involvement of oestrogen receptor alpha (ERalpha) and pregnane X receptor (PXR) was examined by co-transfecting ERalpha- or PXR-constructs. UGT1A1 and UGT2B7 were identified as the major UGT enzymes producing labetalol glucuronides (trace amount of glucuronide conjugate was formed by UGT1A9). The activities of the UGT1A1 promoter containing PXR response elements were enhanced by progesterone, but not by oestrogens, indicating PXR-mediated induction of UGT1A1 promoter activity by progesterone. Results from semi-quantitative real-time polymerase chain reaction (PCR) assays are consistent with the above findings. This effect of progesterone on UGT1A1 promoter activities was concentration dependent. Promoter activities of UGT2B7 were not affected by either oestrogens or progesterone. The results suggest a potential role for progesterone in regulating labetalol elimination by modulating the expression of UGT1A1, leading to enhanced drug metabolism during pregnancy.
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Affiliation(s)
- H Jeong
- Department of Pharmacy Practice, College of Pharmacy, Universit of Illinois at Chicago, Chicago, IL 60612, USA
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Adeyemo WL, Reuther T, Bloch W, Korkmaz Y, Fischer JH, Zöller JE, Kuebler AC. Healing of onlay mandibular bone grafts covered with collagen membrane or bovine bone substitutes: a microscopical and immunohistochemical study in the sheep. Int J Oral Maxillofac Surg 2008; 37:651-9. [PMID: 18378427 DOI: 10.1016/j.ijom.2008.02.005] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2006] [Revised: 08/23/2007] [Accepted: 02/06/2008] [Indexed: 11/26/2022]
Abstract
The objective of this study was to evaluate the role of collagen membrane and Bio-Oss coverage in healing of an onlay graft to the mandible. Twelve adult sheep each received an onlay bone graft (experiment 1), bone graft+Bio-Gide (experiment 2), and bone graft+Bio-Oss/Bio-Gide (experiment 3) on the lateral surface of the mandible. The animals were euthanized at 4, 8, 12 or 16 weeks after surgery, and findings were analysed by routine microscopy and immunohistochemistry for proliferation (Ki67) and apoptotic (Caspase-3) markers. Grafts were fully incorporated in all specimens. Pronounced resorption was observed in experiment 1. Minimal loss of graft volume was seen in experiment 2 specimens without membrane displacement. A remarkable increase in the augmented region of the mandible was observed in experiment 3. A high number of osteoclasts were expressed within the grafts during the early healing period, and thereafter declined markedly. Osteoblasts within the grafts expressed a moderate level of Ki67 at 8 weeks, which thereafter declined markedly. The strongest expression of Caspase-3 on the bone surface was observed after 16 weeks. In conclusion, the effect of collagen membrane coverage on bone graft volume maintenance was dependent on membrane stability during healing. An autogenous bone graft covered with Bio-Oss particles resulted in a remarkable increase in augmented lateral surface of the mandible. The late stage of bone graft healing was associated with a high apoptotic induction pathway of osteoblasts lining the surfaces of the new bone, demonstrated by strong positive Caspase-3 immunoreactivity.
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Affiliation(s)
- W L Adeyemo
- Department of Craniomaxillofacial and Plastic Surgery, University of Cologne, Germany.
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Affiliation(s)
- Laura J Miller
- Department of Psychiatry, University of Illinois at Chicago, USA
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Bovenschulte H, Krug B, Tsimpoulis I, Geissler HJ, Flesch M, Fischer JH, Stuetzer H, Lackner KJ. In vivo Validierung koronararterieller Flussmessungen mittels 16-Zeildetektor-CT am Schweinemodell. ROFO-FORTSCHR RONTG 2008. [DOI: 10.1055/s-2008-1073756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Bangard C, Prenzel K, Yavuzyasar S, Fischer JH, Lackner KJ, Hölscher AH, Stippel DL. Welche Parameter sind zur Positionierung einer Radiofrequenzablationssonde notwendig – Evaluation eines einfachen Algorithmus. ROFO-FORTSCHR RONTG 2008. [DOI: 10.1055/s-2008-1073706] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Abstract
BACKGROUND AND OBJECTIVES Phosphate binders such as calcium salts or sevelamer, a cationic polymer, can markedly reduce absorption of oral ciprofloxacin. This randomized, open-label, two-way, crossover study examined the influence of the cation lanthanum on systemic ciprofloxacin exposure after oral administration. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS Twelve patients randomly received in a crossover manner a single oral dose of ciprofloxacin 750 mg alone and plus lanthanum carbonate 1 g three times daily with meals for six doses, with a washout interval of 7 to 14 d. Serial blood and urine samples were collected for 24 h after ciprofloxacin administration, and ciprofloxacin concentrations were determined using reverse-phase HPLC. Pharmacokinetic parameters of ciprofloxacin were calculated by noncompartmental methods, and the effect of lanthanum on ciprofloxacin pharmacokinetic parameters was assessed using ANOVA. RESULTS Lanthanum decreased (P < 0.001) the mean ciprofloxacin area under the plasma concentration-time curve by 54% and the maximum plasma concentration by 56%. The 24-h urinary recovery of ciprofloxacin was reduced by 52% by lanthanum (P < 0.001). No statistically significant differences in ciprofloxacin time to maximum plasma concentration, elimination half-life, and renal clearance occurred between the two arms. CONCLUSIONS Lanthanum carbonate significantly reduces the systemic exposure to orally administered ciprofloxacin. Concomitant administration of both drugs should be avoided to prevent possible suboptimal response to ciprofloxacin.
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Affiliation(s)
- Priscilla P How
- Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, 833 S. Wood Street, Chicago, IL 60612, USA
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Bovenschulte H, Grimme S, Just T, Flesch M, Stützer H, Nagel HD, Fischer JH, Bartz T, Lackner K. In-vitro Messungen des koronaren Blutflusses mittels 16- und 64-Schicht-CT an einem Schlauchmodell. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Tossios P, Mueller-Ehmsen J, Baisch L, Schmidt M, Schomaecker K, Fischer JH, Bloch W, Schwinger RH, Mehlhorn U. Assessment of cardiac function after bone marrow cell transplantation in pigs with myocardial infarction. Thorac Cardiovasc Surg 2006. [DOI: 10.1055/s-2006-925693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Fischer UM, Klass O, Pfriem D, Probst M, Steinhoff M, Fischer JH, Bloch W, Mehlhorn U. Apoptosis inhibition improves myocardial protection during cardioplegic arrest. Thorac Cardiovasc Surg 2006. [DOI: 10.1055/s-2006-925766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Tossios P, Mueller-Ehmsen J, Baisch L, Schmidt M, Schomaecker K, Fischer JH, Bloch W, Schwinger RH, Mehlhorn U. Tissue distribution of radiolabeled bone marrow cells after intramyocardial transplantation in pigs with myocardial infarction. Thorac Cardiovasc Surg 2006. [DOI: 10.1055/s-2006-925671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Fischer UM, Monzon-Posadas WO, Fischer JH, Bloch W, Mehlhorn U. Apoptosis inhibition improves left ventricular function after prolonged cold cardioplegic arrest. Thorac Cardiovasc Surg 2006. [DOI: 10.1055/s-2006-925845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Stippel DL, Bangard C, Kasper HU, Fischer JH, Hölscher AH, Gossmann A. Experimental bile duct protection by intraductal cooling during radiofrequency ablation. Br J Surg 2005; 92:849-55. [PMID: 15892161 DOI: 10.1002/bjs.5002] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
BACKGROUND The use of radiofrequency ablation (RFA) for liver tumours is limited by the proximity of large bile ducts to the targeted lesion. The aim of this randomized study was to evaluate intraductal cooling as a mean of protecting the bile ducts during RFA. METHODS Twelve pigs underwent RFA adjacent to the right bile duct. After placement of an intraductal cooling catheter and a RFA probe, pigs were randomized to cooling or no cooling. Intraductal temperature was measured in all animals. The bile ducts were assessed by magnetic resonance imaging (MRI) and cholangiography 1 and 28 days after the procedure. RESULTS Intraductal cooling abolished the increase of intraductal temperature seen in the absence of cooling. Concurrent cholangiography and MRI showed a biliary lesion in one of six pigs subjected to intraductal cooling and in five of six without cooling (P = 0.040). The biliary injuries were barely visible by MRI on day 1 but were clearly visible on day 28. CONCLUSION Intraductal cooling can prevent biliary injury induced by RFA. The exact parameters for intraductal cooling require further investigation to establish the best compromise between bile duct protection and complete ablation of surrounding tissue.
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Affiliation(s)
- D L Stippel
- Department of Visceral and Vascular Surgery, University of Cologne, Germany.
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Berry S, Fischer JH, Kruip J, Hauser M, Wildner GF. Monitoring cytosolic pH of carboxysome-deficient cells of Synechocystis sp. PCC 6803 using fluorescence analysis. Plant Biol (Stuttg) 2005; 7:342-7. [PMID: 16025406 DOI: 10.1055/s-2005-837710] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Disruption of the ccmM gene in the cyanobacterium Synechocystis sp. PCC 6803 causes a deficiency of carboxysomes and impairs growth in ambient CO2. The effect of this gene defect on cellular metabolism was investigated using electron microscopy, biochemical and fluorescence analysis. Mutant cells were devoid of the characteristic dense polyhedral bodies called carboxysomes. The photosynthetic oxygen evolution was considerably lower in mutant cells compared to wild type, while Rubisco activity in cell extracts was similar. During photosynthetic CO2-dependent oxygen evolution, Rubisco Vmax dropped from 142 micromol mg-1 chlorophyll h-1 (WT) to 77 micromol mg-1 chlorophyll h-1 in the mutant cells, and the Km for Ci (inorganic carbon) increased from 0.5 mM (WT) to 40 mM. The fluorescent indicator, acridine yellow, was used for non-invasive measurements of cytoplasmic pH changes in whole cells induced by addition of Ci, making use of the decrease in fluorescence yield that accompanies cytoplasmic acidification. The experimental results indicate that control of the cytoplasmic pH is linked to the internal carbon pool (Ci). Both wild-type and ccmM-deficient cells showed a linear response of acridine yellow fluorescence quenching and, thus, of internal acidification, with respect to externally added inorganic carbon. However, the fluorescence analysis of mutant (carboxysome-free) cells indicated slower kinetics of Ci accumulation.
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Affiliation(s)
- S Berry
- Lehrstuhl für Biochemie der Pflanzen, Ruhr-Universität Bochum, 44780 Bochum, Germany
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Zähringer M, Holle J, Fischer JH, Riepert T, Herrmann S, Krug B, Rothschild MA, Lackner K. Tierexperimentelle Untersuchungen am Schwein zum Vergleich des Blutverlustes nach perkutanen Milzpunktionen mit und ohne Verschluss des Punktionskanals durch Gelatineschwamm. ROFO-FORTSCHR RONTG 2005. [DOI: 10.1055/s-2005-867849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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French J, Kanner AM, Bautista J, Abou-Khalil B, Browne T, Harden CL, Theodore WH, Bazil C, Stern J, Schachter SC, Bergen D, Hirtz D, Montouris GD, Nespeca M, Gidal B, Marks WJ, Turk WR, Fischer JH, Bourgeois B, Wilner A, Faught RE, Sachdeo RC, Beydoun A, Glauser TA. Efficacy and Tolerability of the New Antiepileptic Drugs, II: Treatment of Refractory Epilepsy. Report of the TTA and QSS Subcommittees of the American Academy of Neurology and the American Epilepsy Society. Epilepsia 2004. [DOI: 10.1111/j.0013-9580.2004.20041020.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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French JA, Kanner AM, Bautista J, Abou-Khalil B, Browne T, Harden CL, Theodore WH, Bazil C, Stern J, Schachter SC, Bergen D, Hirtz D, Montouris GD, Nespeca M, Gidal B, Marks WJ, Turk WR, Fischer JH, Bourgeois B, Wilner A, Faught RE, Sachdeo RC, Beydoun A, Glauser TA. Efficacy and tolerability of the new antiepileptic drugs I: treatment of new onset epilepsy: report of the Therapeutics and Technology Assessment Subcommittee and Quality Standards Subcommittee of the American Academy of Neurology and the American Epilepsy Society. Neurology 2004; 62:1252-60. [PMID: 15111659 DOI: 10.1212/01.wnl.0000123693.82339.fc] [Citation(s) in RCA: 333] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE To assess the evidence demonstrating efficacy, tolerability, and safety of seven new antiepileptic drugs (AEDs) (gabapentin, lamotrigine, topiramate, tiagabine, oxcarbazepine, levetiracetam, and zonisamide-reviewed in the order in which these agents received approval by the US Food and Drug Administration) in the treatment of children and adults with newly diagnosed partial and generalized epilepsies. METHODS A 23-member committee, including general neurologists, pediatric neurologists, epileptologists, and doctors in pharmacy, evaluated the available evidence based on a structured literature review including MEDLINE, Current Contents, and Cochrane library for relevant articles from 1987 until September 2002, with selected manual searches up until 2003. RESULTS There is evidence either from comparative or dose-controlled trials that gabapentin, lamotrigine, topiramate, and oxcarbazepine have efficacy as monotherapy in newly diagnosed adolescents and adults with either partial or mixed seizure disorders. There is also evidence that lamotrigine is effective for newly diagnosed absence seizures in children. Evidence for effectiveness of the new AEDs in newly diagnosed patients with other generalized epilepsy syndromes is lacking. CONCLUSIONS The results of this evidence-based assessment provide guidelines for the prescription of AEDs for patients with newly diagnosed epilepsy and identify those seizure types and syndromes where more evidence is necessary.
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Affiliation(s)
- J A French
- University of Pennsylvania, Philadelphia, USA
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Popken F, Meschede P, von Smekal U, Erberich H, Bosse M, Michael J, Land M, Fischer JH, Eysel P. Rate of perioperative complications in thermal ablation of bone: an animal trial. Arch Orthop Trauma Surg 2004; 124:326-30. [PMID: 15085356 DOI: 10.1007/s00402-004-0648-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2003] [Indexed: 10/26/2022]
Abstract
INTRODUCTION While only few data are available yet for radioablation of bone tissue, the occurrence of bone marrow embolisms during cryoablation has been documented. It was the aim of this study to assess perioperative complication rates of thermoablation in animals using state-of-the-art ablation probes. MATERIALS AND METHODS Eight adult sheep were placed under general anaesthesia, and using a radioprobe, thermoablation was performed on the medial side of the head of the right tibia. In addition, freezing was performed with miniature cryoprobes on both femurs and the head of the left tibia. Haemodynamic monitoring and determination of blood gases and electrolytes were done intraoperatively. The animals were killed 1 week after surgery, and the ablation sites and lung tissue examined macroscopically and microscopically. RESULTS None of the animals showed pathological changes in any of these parameters. Blood gases remained unremarkable throughout the operation. All eight animals showed an average drop in haemoglobin of 0.97 g/100 ml. Two animals showed fresh embolisms in the pulmonary vessels. CONCLUSION Experimental thermoablation of bone tissue in large animals failed to show any significant perioperative complications following surgery. The lung embolisms which did occur were not clinically relevant. The use of mini-cryoprobes or radioprobes as alternative or complementary measures for treating pathologically altered bone tissue seems viable and does not involve any undue risks.
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Affiliation(s)
- F Popken
- Department of Orthopaedic Surgery, University of Cologne, Josef-Stelzmann-Str. 9, 50931 Cologne, Germany.
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French JA, Kanner AM, Bautista J, Abou-Khalil B, Browne T, Harden CL, Theodore WH, Bazil C, Stern J, Schachter SC, Bergen D, Hirtz D, Montouris GD, Nespeca M, Gidal B, Marks WJ, Turk WR, Fischer JH, Bourgeois B, Wilner A, Faught RE, Sachdeo RC, Beydoun A, Glauser TA. Efficacy and tolerability of the new antiepileptic drugs, II: Treatment of refractory epilepsy: report of the TTA and QSS Subcommittees of the American Academy of Neurology and the American Epilepsy Society. Epilepsia 2004; 45:410-23. [PMID: 15101822 DOI: 10.1111/j.0013-9580.2004.06304.x] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
PURPOSE To assess the evidence demonstrating efficacy, tolerability, and safety of seven new antiepileptic drugs (AEDs) [gabapentin (GBP), lamotrigine (LTG), topiramate (TPM), tiagabine (TGB), oxcarbazepine (OXC), levetiracetam (LEV), and zonisamide (ZNS)] in the treatment of children and adults with refractory partial and generalized epilepsies. METHODS A 23-member committee, including general neurologists, pediatric neurologists, epileptologists, and doctors in pharmacy, evaluated the available evidence based on a structured literature review including MEDLINE, Current Contents, and Cochrane Library for relevant articles from 1987 to March 2003. RESULTS All of the new AEDs were found to be appropriate for adjunctive treatment of refractory partial seizures in adults. GBP can be effective for the treatment of mixed seizure disorders, and GBP, LTG, OXC, and TPM for the treatment of refractory partial seizures in children. Limited evidence suggests that LTG and TPM also are effective for adjunctive treatment of idiopathic generalized epilepsy in adults and children, as well as treatment of the Lennox-Gastaut syndrome. CONCLUSIONS The choice of AED depends on seizure and/or syndrome type, patient age, concomitant medications, and AED tolerability, safety, and efficacy. The results of this evidence-based assessment provide guidelines for the prescription of AEDs for patients with refractory epilepsy and identify those seizure types and syndromes for which more evidence is necessary.
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Affiliation(s)
- Jacqueline A French
- Neurological Institute, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
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French JA, Kanner AM, Bautista J, Abou-Khalil B, Browne T, Harden CL, Theodore WH, Bazil C, Stern J, Schachter SC, Bergen D, Hirtz D, Montouris GD, Nespeca M, Gidal B, Marks WJ, Turk WR, Fischer JH, Bourgeois B, Wilner A, Faught RE, Sachdeo RC, Beydoun A, Glauser TA. Efficacy and Tolerability of the New Antiepileptic Drugs, I: Treatment of New-Onset Epilepsy: Report of the TTA and QSS Subcommittees of the American Academy of Neurology and the American Epilepsy Society. Epilepsia 2004; 45:401-9. [PMID: 15101821 DOI: 10.1111/j.0013-9580.2004.06204.x] [Citation(s) in RCA: 109] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
PURPOSE To assess the evidence demonstrating efficacy, tolerability, and safety of seven new antiepileptic drugs [AEDs; gabapentin (GBP), lamotrigine (LTG), topiramate (TPM), tiagabine (TGB), oxcarbazepine (OXC), levetiracetam (LEV), and zonisamide (ZNS), reviewed in the order in which these agents received approval by the U.S. Food and Drug Administration] in the treatment of children and adults with newly diagnosed partial and generalized epilepsies. METHODS A 23-member committee, including general neurologists, pediatric neurologists, epileptologists, and doctors in pharmacy, evaluated the available evidence based on a structured literature review including MEDLINE, Current Contents, and Cochrane Library for relevant articles from 1987 until September 2002, with selected manual searches up to 2003. RESULTS Evidence exists, either from comparative or dose-controlled trials, that GBP, LTG, TPM, and OXC have efficacy as monotherapy in newly diagnosed adolescents and adults with either partial or mixed seizure disorders. Evidence also shows that LTG is effective for newly diagnosed absence seizures in children. Evidence for effectiveness of the new AEDs in newly diagnosed patients with other generalized epilepsy syndromes is lacking. CONCLUSIONS The results of this evidence-based assessment provide guidelines for the prescription of AEDs for patients with newly diagnosed epilepsy and identify those seizure types and syndromes for which more evidence is necessary.
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Affiliation(s)
- Jacqueline A French
- Neurological Institute, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
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French JA, Kanner AM, Bautista J, Abou-Khalil B, Browne T, Harden CL, Theodore WH, Bazil C, Stern J, Schachter SC, Bergen D, Hirtz D, Montouris GD, Nespeca M, Gidal B, Marks WJ, Turk WR, Fischer JH, Bourgeois B, Wilner A, Faught RE, Sachdeo RC, Beydoun A, Glauser TA. Efficacy and tolerability of the new antiepileptic drugs II: Treatment of refractory epilepsy: Report of the Therapeutics and Technology Assessment Subcommittee and Quality Standards Subcommittee of the American Academy of Neurology and the American Epilepsy Society. Neurology 2004; 62:1261-73. [PMID: 15111660 DOI: 10.1212/01.wnl.0000123695.22623.32] [Citation(s) in RCA: 303] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE To assess the evidence demonstrating efficacy, tolerability, and safety of seven new antiepileptic drugs (AEDs) (gabapentin, lamotrigine, topiramate, tiagabine, oxcarbazepine, levetiracetam, and zonisamide) in the treatment of children and adults with refractory partial and generalized epilepsies. METHODS A 23-member committee including general neurologists, pediatric neurologists, epileptologists, and doctors in pharmacy evaluated the available evidence based on a structured literature review including MEDLINE, Current Contents, and Cochrane library for relevant articles from 1987 until March 2003. RESULTS All of the new AEDs were found to be appropriate for adjunctive treatment of refractory partial seizures in adults. Gabapentin can be effective for the treatment of mixed seizure disorders, and gabapentin, lamotrigine, oxcarbazepine, and topiramate for the treatment of refractory partial seizures in children. Limited evidence suggests that lamotrigine and topiramate are also effective for adjunctive treatment of idiopathic generalized epilepsy in adults and children, as well as treatment of the Lennox Gastaut syndrome. CONCLUSIONS The choice of AED depends upon seizure and/or syndrome type, patient age, concomitant medications, AED tolerability, safety, and efficacy. The results of this evidence-based assessment provide guidelines for the prescription of AEDs for patients with refractory epilepsy and identify those seizure types and syndromes where more evidence is necessary.
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Affiliation(s)
- J A French
- University of Pennsylvania, Philadelphia, USA
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Heidemann W, Ruffieux K, Fischer JH, Jeschkeit-Schubbert S, Jung H, Krueger G, Wintermantel E, Gerlach KL. The effect of an admixture of sodium hydrogen phosphate or heparin-coating to poly(D,L)lactide--results of an animal study. BIOMED ENG-BIOMED TE 2004; 48:262-8. [PMID: 14606266 DOI: 10.1515/bmte.2003.48.10.262] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The study was aimed at investigating the effect of an admixture of sodium hydrogen phosphate (NaP) on the pH value around degrading poly(D,L)lactide (PDLLA) and the possible improvement of PDLLA biocompatibility by coating its surface with heparin. PDLLA +/- NaP was injection-molded to form rods (20 x 3 x 2 (mm)) and cubes (3 x 2 x 2 (mm)). Half of the pure PDLLA samples were surface-coated using heparin. One rod and cube each of PDLLA, PDLLA + NaP and PDLLA/Hep were implanted into the dorsal muscles of 42 rats. From the 2nd to 52nd week after operation, pH measurements were performed in the environment around the implants. The samples were then harvested for histological and mechanical analyses. No significant decrease in pH-values was observed in the tissue around the implants. Pure PDLLA and PDLLA/Hep samples were macroscopically resorbed after 52 weeks, while the degradation of PDLLA + NaP was still in progress. Approximately 80% of the initial bending strength of PDLLA or PDLLA/Hep rods was present after six weeks, while the bending strength of PDLLA + Nap was reduced to 50% after 4 weeks. Heparin-coating of PDLLA did not improve its biocompatibility but did increase its resorption. While no significant effect of NaP on pH value was found, its admixture did reduce the mechanical characteristics of the implants.
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Affiliation(s)
- W Heidemann
- Department of Maxillofacial Surgery, Otto-von-Guericke-University, Magdeburg.
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Klass O, Fischer UM, Tossios P, Pfriem D, Probst M, Kanani GR, Steinhoff M, Fischer JH, Bloch W, de Vivie ER, Mehlhorn U. Cardiac apoptosis inhibition is an effective new strategy to improve myocardial protection. Thorac Cardiovasc Surg 2004. [DOI: 10.1055/s-2004-816583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Klass O, Fischer UM, Antonyan A, Kanani GR, Tossios P, Bosse M, Fischer JH, Bloch W, de Vivie ER, Mehlhorn U. Anti-oxidative treatment for prevention of cardiopulmonary bypass-induced pneumocyte apoptosis. Thorac Cardiovasc Surg 2004. [DOI: 10.1055/s-2004-816769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Fischer UM, Klass O, Stock U, Tossios P, Geissler HJ, Fischer JH, Bloch W, de Vivie ER, Mehlhorn U. Cardiac myocyte regulatory proteins: Potential new targets for myocardial preservation in cardiac surgery? Thorac Cardiovasc Surg 2004. [DOI: 10.1055/s-2004-816779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Heidemann W, Fischer JH, Koebke J, Bussmann C, Gerlach KL. In-vivo-Untersuchung zur Degradation von Poly-(D,L-)Laktid- und Poly-(L-Laktid-co-Glykolid)-Osteosynthesematerial. ACTA ACUST UNITED AC 2003; 7:283-8. [PMID: 14551804 DOI: 10.1007/s10006-003-0492-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
AIMS Comparison of the degradation of poly(D,L)lactide (Resorb X) or poly(lactide-co-glycolide) (LactoSorb) in vivo. MATERIAL AND METHODS LactoSorb and Resorb X osteosynthesis plates were fixed at the lateral aspect of the femora of 26 Chinchilla rabbits using the respective osteosynthesis screws. After intraperitoneal injection of fluorochromes the screw plate bone blocks were resected after 1, 6, 12, 14, 16, 21, 26 months and radiologic, histologic as well as fluorescence microscopic examinations were carried out. RESULTS Newly formed bone was detectable above and beneath the polymers 1 month after the implantation. The implants were totally covered by newly formed bone after 6 months. While the LactoSorb screws were found to be as birefringent as after 1 month, in the Resorb X screws a continuous resorption by phagocytizing marrow cells starting from the periphery was detectable. Resorb X was totally resorbed in histologic slides 12 months after implantation, while total resorption of LactoSorb lasted 14 months; both polymers were replaced by marrow cells. Bone remodeling was not finished 26 months after implantation in both polymers. CONCLUSION Resorption of Resorb X was finished earlier than the resorption of LactoSorb. Both materials were found by fluorescence microscope to be completely resorbed after 12 or 14 months, but bone remodeling of the screw holes was not yet finished 26 months after implantation.
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Affiliation(s)
- W Heidemann
- Klinik für Mund-, Kiefer- und Gesichtschirurgie, Otto-von-Guericke-Universität Magdeburg.
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Popken F, Land M, Bosse M, Erberich H, Meschede P, König DP, Fischer JH, Eysel P. Cryosurgery in long bones with new miniature cryoprobe: an experimental in vivo study of the cryosurgical temperature field in sheep. Eur J Surg Oncol 2003; 29:542-7. [PMID: 12875863 DOI: 10.1016/s0748-7983(03)00069-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
AIM The aim of this in vivo study was to determine whether new miniature cryoprobes provide adequate tissue cooling in long bones by measuring the field of temperature under various conditions. METHODS Freezings were performed in femoral and tibial bones of 10 sheep under general anaesthesia. Applying one cryoprobe, temperatures of -75 degrees C resp. -51 degrees C could be reached within 0.75 cm resp. 1.00 cm of the probe. RESULTS Histological examinations revealed compact bone and marrow necroses along the isotherm in all 10 sheep. Using two cryoprobes simultaneously, a mean temperature decrease to -71 degrees C between the two cryoprobes was achieved thanks to the synergistic freezing effect. Looking at consecutive freezes, it was apparent that with similar cryoprobe end temperatures, the temperature dropped faster if the number of freezing cycles was increased. CONCLUSION In conclusion, it was seen that despite its small diameter, the new miniature cryoprobe delivers adequate in vivo tissue cooling in long tubular bones. Employing the synergistic freezing effect by using two or more cryoprobes simultaneously, efficient in vivo freezing of larger bone segments is also possible. Thus, cryosurgery with the new miniature probes can provide a valuable complement to conventional resection of long tubular bones, and offers a viable alternative to surgical treatment of neoplastic diseases of the skeletal system.
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Affiliation(s)
- F Popken
- Department of Orthopaedic Surgery, University of Cologne, Josef-Stelzmann-Str. 9, 50924, Cologne, Germany
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Abstract
Fosphenytoin is a phosphate ester prodrug developed as an alternative to intravenous phenytoin for acute treatment of seizures. Advantages include more convenient and rapid intravenous administration, availability for intramuscular injection, and low potential for adverse local reactions at injection sites. Drawbacks include the occurrence of transient paraesthesias and pruritus at rapid infusion rates, and cost. Fosphenytoin is highly bound (93-98%) to plasma proteins. Saturable binding at higher plasma concentrations accounts for an increase in its distribution volume and clearance with increasing dose and infusion rate. Fosphenytoin is entirely eliminated through metabolism to phenytoin by blood and tissue phosphatases. The bioavailability of the derived phenytoin relative to intravenous phenytoin is approximately 100% following intravenous or intramuscular administration. The half-life for conversion of fosphenytoin to phenytoin ranges from 7-15 minutes. Faster intravenous infusion rates and competitive displacement of derived phenytoin from plasma protein binding sites by fosphenytoin compensate for the expected conversion-related delay in appearance of phenytoin in the plasma. Unbound phenytoin plasma concentrations achieved with intravenous fosphenytoin loading doses of 100-150 or 50-100mg phenytoin sodium equivalents/min are comparable, and achieved at similar times, to those with equimolar doses of intravenous phenytoin at 50 (maximum recommended rate) or 20-40 mg/min, respectively. The rapid achievement of effective concentrations permits the use of fosphenytoin in emergency situations, such as status epilepticus. Following intramuscular administration, therapeutic phenytoin plasma concentrations are observed within 30 minutes and maximum plasma concentrations occur at approximately 30 minutes for fosphenytoin and at 2-4 hours for derived phenytoin. Plasma concentration profiles for fosphenytoin and total and unbound phenytoin in infants and children closely approximate those in adults following intravenous or intramuscular fosphenytoin at comparable doses and infusion rates. Earlier and higher unbound phenytoin plasma concentrations, and thus an increase in systemic adverse effects, may occur following intravenous fosphenytoin loading doses in patients with a decreased ability to bind fosphenytoin and phenytoin (renal or hepatic disease, hypoalbuminaemia, the elderly). Close monitoring and reduction in the infusion rate by 25-50% are recommended when intravenous loading doses of fosphenytoin are administered in these patients. The potential exists for clinically significant interactions when fosphenytoin is coadministered with other highly protein bound drugs. The pharmacokinetic properties of fosphenytoin permit the drug to serve as a well tolerated and effective alternative to parenteral phenytoin in the emergency and non-emergency management of acute seizures in children and adults.
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Affiliation(s)
- James H Fischer
- Department of Pharmacy Practice, Colleges of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, USA.
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Schröder W, Beckurts KTE, Stähler D, Stützer H, Fischer JH, Hölscher AH. Microcirculatory changes associated with gastric tube formation in the pig. Eur Surg Res 2002; 34:411-7. [PMID: 12403940 DOI: 10.1159/000065709] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The standard reconstruction after esophagectomy is the formation of a gastric tube with partial devascularization of the lesser curvature. The purpose of this experimental study was to establish an animal model in order to analyze microcirculation associated with the formation of a gastric tube. In 17 pigs tissue perfusion was measured with a laser Doppler imager (LDI) and partial tissue oxygen pressure (ptO(2)) with a Clark-type polarographic oxygen electrode before and after formation of a gastric tube in well-defined regions of the stomach. The operative procedure included the dissection of the left gastric and short gastric arteries; the left gastroepiploic artery along the greater curvature was preserved. LDI and ptO(2) baseline measurement were significantly lower in the fundus compared to the antrum and corpus. After formation of a gastric tube LDI and ptO(2) baseline values calculated from the mean measurements of the antrum, corpus and fundus decreased significantly (LDI: 1,099 PU +/- 228 SD to 601 PU +/- 125 SD, p < 0.0001; ptO(2): 50.8 mm Hg +/- 5.9 SD to 40.7 mm Hg +/- 9.3 SD, p = 0.0003). Microcirculatory changes did not correlate with changes of cardiac output and systemic vascular resistance. This study suggests that the pig is an appropriate model to investigate microcirculation associated with gastric tube formation. Its use for esophageal reconstruction by pull-up of the gastric interponate is limited.
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Affiliation(s)
- W Schröder
- Department of Visceral and Vascular Surgery, Informatics and Epidemiology, University of Cologne, Germany.
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Itokazu GS, Fischer JH, Manitpisitkul P, Hariharan R, Danziger LH. Lack of effect of nizatidine-induced elevation of gastric pH on the oral bioavailability of dapsone in healthy volunteers. Pharmacotherapy 2002; 22:1420-5. [PMID: 12432968 DOI: 10.1592/phco.22.16.1420.33698] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
STUDY OBJECTIVE To investigate the effect of histamine2 (H2)-receptor antagonist-induced elevation of gastric pH on oral bioavailability of a single dose of dapsone 100 mg. DESIGN Prospective, randomized, crossover, open-label, single-dose pharmacokinetic study. SETTING Teaching hospital. PATIENTS Sixteen men were enrolled in the study; data from 11 subjects were evaluable. INTERVENTIONS Participants received two treatments separated by at least 14 days. Treatment A consisted of a single dose of dapsone 100 mg. Treatment B consisted of a single dose of dapsone 100 mg plus two doses of oral nizatidine 300 mg administered 3-4 hours apart to maintain gastric pH above 6.0. Plasma samples collected before and up to 120 hours after dapsone administration were analyzed for dapsone and monoacetyldapsone (MADDS) by high-performance liquid chromatography. Pharmacokinetic parameters were determined by noncompartmental analysis. MEASUREMENTS AND MAIN RESULTS Gastric pH in the first 6 hours after dapsone administration was above 6.0 for a mean +/- SD of 1.1% +/- 2.9% of the time in the absence of nizatidine and 69.5% +/- 18.0% of the time during nizatidine therapy. The geometric mean dapsone maximum plasma concentration (Cmax) declined by 13% (p<0.01), and median time to Cmax occurred 2 hours later (p<0.01) with nizatidine coadministration compared with dapsone alone. Inclusion of the 90% confidence interval for the mean Cmax ratio within the equivalence interval of 0.8-1.25 demonstrated the lack of clinical significance for this modest decrease in Cmax. Neither the area under the dapsone plasma concentration-time curve from zero to infinity nor the elimination half-life of dapsone were significantly altered by nizatidine. No clinically significant changes were observed in the pharmacokinetics of MADDS with regard to coadministration of nizatidine. CONCLUSION Elevation of gastric pH by H2-receptor antagonists, such as nizatidine, does not result in clinically important changes in the rate or extent of oral dapsone absorption.
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Affiliation(s)
- Gail S Itokazu
- Department of Pharmacy Practice, College of Pharmacy, University of Illinois at Chicago, USA.
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Volk O, Schnitker W, Brass P, Klass O, Bosse M, Boerner U, Fischer JH, Schregel W. [Detection of air embolism by a re-usable Doppler probe integrated in a central venous line--application in-vivo]. Anaesthesist 2002; 51:716-20. [PMID: 12232642 DOI: 10.1007/s00101-002-0357-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
PROBLEM Air embolism frequently occurs under neurosurgical operations performed in the sitting position. Recently we reported the idea of inserting a re-usable doppler probe into a blind-ending lumen of a central venous catheter (Schregel-Volk-Catheter, SVC). In vitro testing in a circulation model showed a high sensitivity: air bubbles as small as 0.5 microliter were reliably detected at a distance up to 4 cm from the tip of the SVC. METHOD After approval by the local ethics committee pigs were anaesthetised and a cardiopulmonary bypass was connected. During the bypass period a 12 F SVC (Medex Medical, Germany) with one blind-ending lumen was positioned into the proximal vena cava cranialis or vena cava caudalis. An 8 MHz doppler probe (MTB Basler, Suisse) was introduced into the SVC and connected with the doppler device Multi-Dop T (DWL, Germany). Well defined air bubbles (3-6 microliter) were generated by a bubble generator and injected into the right femoral vein or the left vena jugularis interna. RESULTS All bubbles were reliably detected by the re-usable doppler probe. Embolic events can be documented, counted and quantified by the Multi-Dop T. CONCLUSION Using SVC's with a blind-ending lumen could improve and simplify the detection of air embolism. We see several advantages (e.g. sensitivity, costs) compared with established methods (precordial doppler, TEE) for detection of air embolism.
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Affiliation(s)
- O Volk
- Medizinische Klinik I, Klinikum Krefeld, Germany.
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Kunze S, Jeschkeit-Schubbert S, Dahnken S, Fischer JH, Herzig S. Endothelial function after prolonged coronary artery oxygen persufflation in a rabbit model of heart preservation. Interact Cardiovasc Thorac Surg 2002; 1:16-22. [PMID: 17669949 DOI: 10.1016/s1569-9293(02)00004-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Abstract
Coronary oxygen persufflation may serve as a means to improve storage conditions and organ preservation time for cardiac transplantation. We examined whether coronary oxygen persufflation and prolonged preservation time alter the endothelium-dependent relaxation of isolated coronary arteries. Isolated rabbit hearts were subjected to four different protocols: control (no preservation), 3 h cold storage in Bretschneider's solution, 18 h cold storage in Bretschneider's or University of Wisconsin solution, combined with coronary oxygen persufflation. After 2 h parabiotic reperfusion, intramural segments of coronary arteries were isolated and isometric tension was recorded using a small-vessel myograph. Endothelial function was examined using carbachol and substance P, applied after vessel constriction using high (30 mmol/l) K(+) or U 46.619, a thromboxane receptor agonist. In another series, coronary flow was measured after Bretschneider's +/-18 h coronary oxygen persufflation, or in freshly isolated, retrogradely perfused Langendorff hearts. Flow responses to substance P, acetylcholine or bradykinin were recorded. In saline-reperfused intact hearts no change in the normal effects of endothelium-dependent relaxants was detected after 18 h, irrespective of coronary oxygen persufflation. However, after isolation of the resistance vessels endothelium-dependent relaxation was abolished after long-term preservation and persufflation. Similar results were obtained after mechanical removal of the endothelium using control hearts. Short-term preservation without persufflation resulted in relaxations similar to those in non-preserved control hearts. Long-term preservation of rabbit heart including coronary oxygen persufflation results in unchanged endothelium-dependent relaxation in intact heart, but abolishes the endothelium-dependent relaxation after isolation of the vessels.
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Affiliation(s)
- S Kunze
- Department of Pharmacology, University of Cologne, Gleueler Strasse 24, 50931 Cologne, Germany
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Heidemann W, Jeschkeit S, Ruffieux K, Fischer JH, Wagner M, Krüger G, Wintermantel E, Gerlach KL. Degradation of poly(D,L)lactide implants with or without addition of calciumphosphates in vivo. Biomaterials 2001; 22:2371-81. [PMID: 11511034 DOI: 10.1016/s0142-9612(00)00424-5] [Citation(s) in RCA: 127] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The study was aimed at examining the in vivo degradation of pure poly(D,L)lactide (PDLLA) or PDLLA with an admixture of calciumphosphates. One rod (20 x 3 x 2 mm) and one cube (3 x 2 x 2 mm) of pure PDLLA, PDLLA with tricalciumphosphate (PDLLA + TCP) or PDLLA with calciumhydrogenphosphate (PDLLA + CHP), respectively, were implanted into the dorsal muscles of 50 male Wistar Albino rats. After definite intervals (from 2nd to 72nd week), pH measurements were performed in the environment of the implants. Afterwards, the cubes with their surrounding tissues were excised for histological examinations, measurements of the outer dimensions and mechanical analyses of the explanted rods were performed. No drop of more than 0.1 pH units was detectable in the tissue surrounding any type of implants. No advantageous effect of the calciumphosphates could be proved. A mild foreign body reaction could be observed around PDLLA implants. After 72 weeks, pure PDLLA had been totally resorbed from the extracellular space, the degradation of calciumphosphate-enriched PDLLA was still in progress. A large amount of inflammations occurred in the tissues surrounding PDLLA with an admixture of slowly degrading TCP or CHP, leading to two abscesses and four fistulas at PDLLA + TCP, and two abscesses and three fistulas at PDLLA + CHP implantation site. Bending strength of pure PDLLA was constant up to the 4th week post-implantation and reduced to 60% of the initial value up to the 12th week. No traces of crystallinity could be observed during the degradation of PDLLA. As a conclusion of the study, complete resorption from the extracellular space and tissue tolerance of pure PDLLA is proved. An admixture of small calciumphosphate particles is not suitable to improve the biocompatibility of PDLLA but leads to a decrease in the mechanical characteristics.
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Affiliation(s)
- W Heidemann
- Department of Maxillofacial Surgery, Otto-von-Guericke-University, Magdeburg, Germany.
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Heidemann W, Jeschkeit S, Ruffieux K, Fischer JH, Wintermantel E, Gerlach KL. The effect of an addition of sodium hydrogenphosphate to poly(D,L)lactide--results of in vitro examinations. BIOMED ENG-BIOMED TE 2001; 46:236-40. [PMID: 11593980 DOI: 10.1515/bmte.2001.46.9.236] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Aim of the study was to examine the influence of sodium hydrogenphosphate (NaP) on the pH value and the mechanical characteristics of degrading poly(D,L)lactide (PDLLA). Test rods of PDLLA with or without NaP amounting to 1, 10, 25 or 50 mol per 100 mol lactate, the degradation product of PDLLA, were produced by injection molding. Molecular weight and bending strength of the rods were measured before and after an accelerated in vitro-test (55 degrees C, Ringer's solution (RS)). For a long-time degradation test PDLLA-rods with or without 1 mol% NaP were placed in RS or Soerensen buffer solution (SB, pH 7.4) at 37 +/- 1 degrees C. Measurements of pH and determination of length, volume and weight of the samples were done in 2-4 week intervals up to the 52nd week after incubation. A pH-drop was measured in RS or SB containing pure PDLLA after 28 or 36 weeks respectively. Stabilization of the pH value due to admixed NaP delayed the degradation related pH drop for 8 weeks in RS or SB. A strong increase of length, volume and weight was measured in PDLLA + NaP-rods. In conclusion minimal stabilization of pH but also an increase of outer dimensions of the samples was found due to the admixture of NaP to PDLLA. Thus, an addition of substantially higher amounts than 1 mol% NaP in PDLLA can not be recommended, regardless of the positive effects on pH stabilization.
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Affiliation(s)
- W Heidemann
- Department of Maxillofacial Surgery, Otto-von-Guericke-University, Magdeburg, Germany.
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