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Patel AM, Dee EC, Hubbard A, Milligan MG, Ebner DK, Alcorn SR, LaVigne A, Kudner RF, Mayo C, Adler D, Suggs K, Greathouse A, Ludwig MS, Nguyen PL, Waddle MR, Thompson RF, Mahal BA, Yamoah K. Health Equity Achievement in Radiation Therapy (HEART) Score: A Social Prognosis. Int J Radiat Oncol Biol Phys 2023; 117:e612-e613. [PMID: 37785841 DOI: 10.1016/j.ijrobp.2023.06.1988] [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: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) The aim of this study was to develop a Health Equity Achievement in Radiation Therapy (HEART) score that can help identify patients at risk of experiencing suboptimal quality-of-care (QoC) early on in the patient-provider encounter and prior to initiation of treatment. Such a score may improve shared decision making to improve QoC. MATERIALS/METHODS A retrospective analysis was conducted using the National Cancer Database (NCDB) for prostate cancer cases between 2004-2017. Sociodemographic factors, clinical characteristics, and treatment information were collected. A composite HEART score was built to predict suboptimal QoC, defined as treatment refusal, incomplete treatment, or treatment delay. 70% of the data was allocated to training and 30% to validating a logistic regression model through which a nomogram was constructed. RESULTS A total of 1,599,785 patients were included in the analysis, of whom 126,917 (7.9%) had at least one suboptimal QoC. The strongest predictors were Black race, uninsured status, lower educational status, geographic location, and nodal disease (Table). The nomogram demonstrated a fair ability to predict quality metrics, with an area under the receiver operating characteristic curve (AUC) of 0.57 in the test group. The nomogram facilitated graphic interpretation of systemic factors in contributing to suboptimal QoC. CONCLUSION With observed potential for predicting suboptimal QoC outcomes in patients with prostate cancer by considering systemic barriers, this NCDB-based nomogram has potential utility as a tool for identifying patients who may benefit from additional social support, including the financial resources associated with these services, to improve access to care. Further validation in diverse datasets is needed to improve performance and generalizability to broader patient populations and different disease sites.
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Affiliation(s)
- A M Patel
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX
| | - E C Dee
- Memorial Sloan Kettering Cancer Center, New York, NY
| | - A Hubbard
- American Society for Radiation Oncology, Arlington, VA
| | | | - D K Ebner
- Rhode Island Hospital, Providence, RI
| | - S R Alcorn
- Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University School of Medicine, Baltimore, MD
| | - A LaVigne
- Johns Hopkins University School of Medicine, Baltimore, MA
| | - R F Kudner
- American Society for Radiation Oncology, Arlington, VA
| | - C Mayo
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI
| | - D Adler
- American Society for Radiation Oncology, Arlington, VA
| | - K Suggs
- American Society for Radiation Oncology, Arlington, VA
| | - A Greathouse
- American Society for Radiation Oncology, Arlington, VA
| | - M S Ludwig
- Department of Radiation Oncology, Dan L. Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, TX
| | - P L Nguyen
- Brigham and Women's Hospital/Dana-Farber Cancer Institute, Boston, MA
| | - M R Waddle
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN
| | - R F Thompson
- Department of Radiation Medicine, Oregon Health & Science University, Portland, OR
| | - B A Mahal
- Department of Radiation Oncology, University of Miami/Sylvester Comprehensive Cancer Center, Miami, FL
| | - K Yamoah
- H. Lee Moffitt Cancer Center and Research Institute, Department of Radiation Oncology, Tampa, FL
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Motaghi M, England RW, Nejad NH, Sankaran N, Patel AM, Khan MA. Assessing long-term locoregional control of spinal osseous metastases after microwave ablation. J Clin Neurosci 2022; 104:48-55. [PMID: 35963064 DOI: 10.1016/j.jocn.2022.07.025] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 07/26/2022] [Accepted: 07/31/2022] [Indexed: 11/18/2022]
Abstract
Osseous metastases to the spine result in significant pain and decreased quality of life. The purpose of this study was to evaluate the long-term efficacy of microwave ablation (MWA) for the treatment of spinal metastases regarding pain reduction and local control of disease progression. In this single center retrospective study, patients with osseous metastases to the spine undergoing MWA with vertebroplasty from 2013 to 2020 were included. Locoregional control of metabolic activity at the treated level was assessed using PET/CT scan both pre- and post-procedure. Pain reduction was measured using change in visual analog scale (VAS) pain score. Forty-eight spinal levels were treated with MWA in 28 patients (57 % male, mean age 68 ± 9 years). Median ablation time, energy, and temperature were 4 min and 13 s, 3.6 kJ, and 80 °C, respectively. Median pre-procedure maximum standard uptake value (SUVmax) was significantly reduced following ablation, from 4.55 (IQR 3.65-6.1) to 0 (IQR 0-1.8; p < 0.001), over an average of 29 ± 14.1 month follow up period. Pre-procedure VAS pain score was reduced from median (IQR) of 8 (6.5-9) to 1(1-2), 2(1-3) and 1(0.5-3) at 24 h, four weeks, and six months post-procedure, respectively (all p < 0.001 with respect to pre-procedure scores). In conclusion, this study supports microwave ablation as an effective technique for pain palliation and long-term locoregional tumor control of oligometastatic spinal disease as assessed by metabolic response.
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Affiliation(s)
- Mina Motaghi
- Department of Internal Medicine, Brookdale University Medical Center, Brooklyn, NY 11212, USA
| | - Ryan W England
- Russell H. Morgan Department of Radiology and Radiological Science, Division of Vascular and Interventional Radiology, the Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Nima Hafezi Nejad
- Russell H. Morgan Department of Radiology and Radiological Science, Division of Vascular and Interventional Radiology, the Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Nisha Sankaran
- Russell H. Morgan Department of Radiology and Radiological Science, Division of Vascular and Interventional Radiology, the Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Akash M Patel
- Department of Radiology, Division of Interventional Radiology, The University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Majid A Khan
- Russell H. Morgan Department of Radiology and Radiological Science, Division of Vascular and Interventional Radiology, the Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA; Department of Radiology. Division of Neuroradiology, Thomas Jefferson University Hospital, Philadelphia, PA 19107, USA.
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Mak VW, Patel AM, Yen R, Hanisak J, Lim YH, Bao J, Zheng R, Seganish WM, Yu Y, Healy DR, Ogawa A, Ren Z, Soriano A, Ermakov GP, Beaumont M, Metwally E, Cheng AC, Verras A, Fischmann T, Zebisch M, Silvestre HL, McEwan PA, Barker J, Rearden P, Greshock TJ. Optimization and Mechanistic Investigations of Novel Allosteric Activators of PKG1α. J Med Chem 2022; 65:10318-10340. [PMID: 35878399 DOI: 10.1021/acs.jmedchem.1c02109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Activation of PKG1α is a compelling strategy for the treatment of cardiovascular diseases. As the main effector of cyclic guanosine monophosphate (cGMP), activation of PKG1α induces smooth muscle relaxation in blood vessels, lowers pulmonary blood pressure, prevents platelet aggregation, and protects against cardiac stress. The development of activators has been mostly limited to cGMP mimetics and synthetic peptides. Described herein is the optimization of a piperidine series of small molecules to yield activators that demonstrate in vitro phosphorylation of vasodilator-stimulated phosphoprotein as well as antiproliferative effects in human pulmonary arterial smooth muscle cells. Hydrogen/deuterium exchange mass spectrometry experiments with the small molecule activators revealed a mechanism of action consistent with cGMP-induced activation, and an X-ray co-crystal structure with a construct encompassing the regulatory domains illustrated a binding mode in an allosteric pocket proximal to the low-affinity cyclic nucleotide-binding domain.
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Affiliation(s)
- Victor W Mak
- Discovery Chemistry, Merck & Co., Inc., South San Francisco, California 94080, United States
| | - Akash M Patel
- Discovery Chemistry, Merck & Co., Inc., South San Francisco, California 94080, United States
| | - Rose Yen
- Discovery Chemistry, Merck & Co., Inc., South San Francisco, California 94080, United States
| | - Jennifer Hanisak
- Discovery Chemistry, Merck & Co., Inc., Kenilworth, New Jersey 07033, United States
| | - Yeon-Hee Lim
- Discovery Chemistry, Merck & Co., Inc., South San Francisco, California 94080, United States
| | - Jianming Bao
- Discovery Chemistry, Merck & Co., Inc., South San Francisco, California 94080, United States.,Ionova Life Science, Shenzhen 518122, Guangdong, China
| | - Rong Zheng
- IDSU, Wuxi AppTec Co., Ltd, Shanghai 200131, China
| | - W Michael Seganish
- Discovery Chemistry, Merck & Co., Inc., South San Francisco, California 94080, United States
| | - Yang Yu
- Discovery Chemistry, Merck & Co., Inc., Kenilworth, New Jersey 07033, United States
| | - David R Healy
- Discovery Biology, Merck & Co., Inc., Boston, Massachusetts 02115, United States
| | - Aimie Ogawa
- Quantitative Biosciences, Merck & Co., Inc., South San Francisco, California 94080, United States
| | - Zhao Ren
- Quantitative Biosciences, Merck & Co., Inc., South San Francisco, California 94080, United States
| | - Aileen Soriano
- Mass Spectrometry and Biophysics, Computation and Structural Chemistry, Merck & Co., Inc., Kenilworth, New Jersey 07033, United States
| | - Grigori P Ermakov
- PPDM Discovery Bioanalytics, Merck & Co., Inc., South San Francisco, California 94080, United States
| | - Maribel Beaumont
- PPDM Discovery Bioanalytics, Merck & Co., Inc., South San Francisco, California 94080, United States
| | - Essam Metwally
- Computational and Structural Chemistry, Merck & Co., Inc., South San Francisco, California 94080, United States
| | - Alan C Cheng
- Computational and Structural Chemistry, Merck & Co., Inc., South San Francisco, California 94080, United States
| | - Andreas Verras
- Schrodinger Inc., 120 West 45th Street, 17th Floor, New York, New York 10036-4041, United States.,Computational and Structural Chemistry, Merck & Co., Inc., Kenilworth, New Jersey 07033, United States
| | - Thierry Fischmann
- Computational and Structural Chemistry, Merck & Co., Inc., Kenilworth, New Jersey 07033, United States
| | - Matthias Zebisch
- Evotec (UK) Ltd, 114 Innovation Drive, Milton Park, Abingdon, Oxfordshire OX14 4RZ, U.K
| | - H Leonardo Silvestre
- Evotec (UK) Ltd, 114 Innovation Drive, Milton Park, Abingdon, Oxfordshire OX14 4RZ, U.K
| | - Paul A McEwan
- Evotec (UK) Ltd, 114 Innovation Drive, Milton Park, Abingdon, Oxfordshire OX14 4RZ, U.K
| | - John Barker
- Evotec (UK) Ltd, 114 Innovation Drive, Milton Park, Abingdon, Oxfordshire OX14 4RZ, U.K
| | - Paul Rearden
- DMPK, Recursion Pharmaceuticals, Salt Lake City, Utah 84101, United States.,PPDM, Merck & Co., Inc., South San Francisco, California 94080, United States
| | - Thomas J Greshock
- Discovery Chemistry, Merck & Co., Inc., South San Francisco, California 94080, United States
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4
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Berger I, Simpson S, Friedberg JS, Culligan MJ, Wileyto EP, Alley EW, Sterman D, Patel AM, Khalid U, Simone CB, Cengel KA, Katz SI, Roshkovan L. CT for detection of malignant posterior intercostal lymph nodes in patients undergoing pre-operative staging for malignant pleural mesothelioma. Lung Cancer 2020; 152:34-38. [PMID: 33341086 DOI: 10.1016/j.lungcan.2020.12.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 09/06/2020] [Accepted: 12/01/2020] [Indexed: 10/22/2022]
Abstract
INTRODUCTION Recent evidence suggests that patients with malignant pleural mesothelioma (MPM) undergoing extended pleurectomy/decortication (eP/D) with metastasis to the posterior intercostal lymph nodes (PILN) have a worse prognosis. In this study, we determine if MPM PILN metastasis can be reliably detected on computed tomography (CT). MATERIALS AND METHODS Preoperative staging CT exams were reviewed for the presence of PILN in MPM patients undergoing eP/D between 2007-2013 with surgical sampling of their PILN. CT images were reviewed by two thoracic radiologists blinded to clinical records, including operative pathology reports. The number and short axis size of PILN were recorded and correlated with surgical pathology. Statistical analysis examined the value of preoperative CT to detect metastatic PILN. RESULTS Of 36 patients that underwent eP/D with PILN sampling had preoperative CT images for review. At surgery, 22 of these patients had metastatic PILN and 14 had benign PILN. The positive and negative predictive values for one or more nodes seen on preoperative CT were 60 % and 38 % respectively. The number of PILN on preoperative CT did not predict metastasis (p = 0.40) with an average of 2 PILN seen, regardless of PILN pathology. The average nodal short axis size was 4.6 mm and 4.8 mm for benign and malignant PILN, respectively, and PILN short axis size did not predict metastasis (p = 0.39). There was little inter-observer variability between the size and number of nodes detected by each radiologist. CONCLUSIONS CT does not reliably identify metastatic PILN on preoperative CT for patients with MPM undergoing extended pleurectomy/decortication.
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Affiliation(s)
- I Berger
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Scott Simpson
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - J S Friedberg
- University of Maryland School of Medicine, Baltimore, MD, USA
| | | | - E Paul Wileyto
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Evan W Alley
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - D Sterman
- NYU School of Medicine, New York, NY, USA
| | - Akash M Patel
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - U Khalid
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - C B Simone
- New York Proton Center and Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Keith A Cengel
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Sharyn I Katz
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA.
| | - L Roshkovan
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA.
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Abstract
INTRODUCTION Toll-like receptors 7 and 8 (TLR7 and TLR8) are endosomal immune receptors that initiate an innate immune response and can facilitate activation of the adaptive immune system. Both preclinical and clinical studies have shown the downstream inflammatory response from TLR7 and TLR8 agonism results in preliminary efficacy for the treatment of cancer, viral infections, and for use as a vaccine adjuvant. AREAS COVERED This patent review covers recent developments in small molecule TLR7 and TLR8 agonists published between January 2014 - February 2020. We summarize relevant chemical scaffolds, observed structure-activity relationships, and where available, preliminary animal models, and clinical data. EXPERT OPINION In the last 6 years, there has been significant progress in the optimization of novel TLR7 and TLR8 small molecule agonists. These novel compounds are currently being evaluated in the clinic for multiple antiviral and oncology indications. Clinical data from these trials will provide a clearer outlook on 1) the TLR7/8 engagement necessary to obtain the desired immune response, 2) safety margin improvement using directed delivery, and 3) potential synergistic effects with checkpoint inhibitor combination therapies.
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Affiliation(s)
- Madeleine E Kieffer
- Department of Discovery Chemistry, Merck & Co., Inc , South San Francisco, California, USA
| | - Akash M Patel
- Department of Discovery Chemistry, Merck & Co., Inc , South San Francisco, California, USA
| | - Scott A Hollingsworth
- Department of Discovery Chemistry, Merck & Co., Inc , South San Francisco, California, USA
| | - W Michael Seganish
- Department of Discovery Chemistry, Merck & Co., Inc , South San Francisco, California, USA
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6
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Berger I, Cengel KA, Simone CB, Alley EW, Roshkovan L, Haas AR, Patel AM, Khalid U, Culligan MJ, McNulty S, Singhal S, Friedberg JS, Katz SI. Lymphangitic carcinomatosis: A common radiographic manifestation of local failure following extended pleurectomy/decortication in patients with malignant pleural mesothelioma. Lung Cancer 2019; 132:94-98. [PMID: 31097101 DOI: 10.1016/j.lungcan.2019.03.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 03/19/2019] [Accepted: 03/25/2019] [Indexed: 10/27/2022]
Abstract
INTRODUCTION The lymphangitic carcinomatosis (LC) pattern of metastatic malignancy is associated with a poor prognosis but is currently not well defined in malignant pleural mesothelioma (MPM). Here, we report the incidence and prognostic significance of the radiographic development of LC in MPM following extended pleurectomy/decortication (EPD). METHODS Consecutive patients with biopsy-proven MPM undergoing EPD with intraoperative photodynamic therapy (PDT) at our institution from 2008 to 2014 were included in this retrospective study. Patients without available post-surgical clinical or imaging data for direct review were excluded. CT images were reviewed by an experienced, board-certified thoracic radiologist and confirmed by consensus review. Overall survival (OS) and progression-free survival (PFS) were calculated by Kaplan Meier methodology. Hazard ratios were compared with a cox proportional hazard model. RESULTS 44 patients underwent EPD with PDT during the study period and had available clinical and imaging data. During the follow-up period (median 34 months), 17 patients (39%) developed LC at a median of 10 months after surgery (IQR 5-21 months). 16 of the 17 patients who developed LC (94%) died during the follow-up period, compared to 17 of the 27 who did not develop LC (63%). OS for the LC versus non-LC group was 53% versus 93% at 1 year and 18% versus 67% at 3 years. LC was significantly associated with a lower OS (HR 4.07; 95% confidence interval 1.44-11.48; p = 0.008). PFS for the LC group versus non-LC group was 8 months (IQR 5-9 months) compared to 17 months (IQR 11-24 months) (p < 0.001). CONCLUSION LC is a common form of failure in MPM following EPD and is associated with a poor prognosis. Thus, further studies are warranted to determine if any evidence of preoperative LC should be an absolute contraindication to EPD and may warrant an EPP or no surgery at all.
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Affiliation(s)
- Ian Berger
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, United States
| | - Keith A Cengel
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, United States
| | - Charles B Simone
- University of Maryland School of Medicine, Baltimore, MD, United States
| | - Evan W Alley
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, United States
| | - Leonid Roshkovan
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, United States
| | - Andrew R Haas
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, United States
| | - Akash M Patel
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, United States
| | - Urooj Khalid
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, United States
| | | | - Sally McNulty
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, United States
| | - Sunil Singhal
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, United States
| | | | - Sharyn I Katz
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, United States.
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Westerman S, Hoskins MH, Merchant FM, Delurgio DB, Patel AM, El-Chami MF, Patel AM, Ndubisi NM, Halkos M, Lattouf O. P5768Continuous rhythm monitoring of atrial fibrillation recurrence after hybrid endocardial-epicardial ablation. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy566.p5768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- S Westerman
- Emory University, Electrophysiology, Atlanta, United States of America
| | - M H Hoskins
- Emory University, Electrophysiology, Atlanta, United States of America
| | - F M Merchant
- Emory University, Electrophysiology, Atlanta, United States of America
| | - D B Delurgio
- Emory University, Electrophysiology, Atlanta, United States of America
| | - A M Patel
- Emory University, Electrophysiology, Atlanta, United States of America
| | - M F El-Chami
- Emory University, Electrophysiology, Atlanta, United States of America
| | - A M Patel
- Emory University School of Medicine, Atlanta, United States of America
| | - N M Ndubisi
- Emory University, Cardiothoracic Surgery, Atlanta, United States of America
| | - M Halkos
- Emory University, Cardiothoracic Surgery, Atlanta, United States of America
| | - O Lattouf
- Emory University, Cardiothoracic Surgery, Atlanta, United States of America
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Khan MA, Deib G, Deldar B, Patel AM, Barr JS. Efficacy and Safety of Percutaneous Microwave Ablation and Cementoplasty in the Treatment of Painful Spinal Metastases and Myeloma. AJNR Am J Neuroradiol 2018; 39:1376-1383. [PMID: 29794238 PMCID: PMC7655455 DOI: 10.3174/ajnr.a5680] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Accepted: 03/06/2018] [Indexed: 12/22/2022]
Abstract
BACKGROUND AND PURPOSE Painful spinal metastases are a common cause of cancer-related morbidity. Percutaneous ablation presents an attractive minimally invasive alternative to conventional therapies. We performed a retrospective review of 69 patients with 102 painful spinal metastases undergoing microwave ablation and cementoplasty to determine the efficacy and safety of this treatment. MATERIALS AND METHODS Procedures were performed between January 2015 and October 2016 with the patient under general anesthesia using image guidance for 102 spinal metastases in 69 patients in the following areas: cervical (n = 2), thoracic (n = 50), lumbar (n = 34), and sacral (n = 16) spine. Tumor pathologies included the following: multiple myeloma (n = 10), breast (n = 27), lung (n = 12), thyroid (n = 6), prostate (n = 5), colon (n = 4), renal cell (n = 3), oral squamous cell (n = 1), and adenocarcinoma of unknown origin (n = 1). Procedural efficacy was determined using the visual analog scale measured preprocedurally and at 2-4 weeks and 20-24 weeks postprocedure. Tumor locoregional control was assessed on follow-up cross-sectional imaging. Procedural complications were recorded to establish the safety profile. RESULTS The median ablation time was 4 minutes 30 seconds ± 7 seconds, and energy dose, 4.1 ± 1.6 kJ. Median visual analog scale scores were the following: 7.0 ± 1.8 preprocedurally, 2 ± 1.6 at 2-4 weeks, and 2 ± 2.1 at 20-24 weeks. Eight patients died within 6 months following the procedure. Follow-up imaging in the surviving patients at 20-24 weeks demonstrated no locoregional progression in 59/61 patients. Two complications were documented (S1 nerve thermal injury and skin burn). CONCLUSIONS Microwave ablation is an effective and safe treatment technique for painful spinal metastases. Further studies may be helpful in determining the role of microwave ablation in locoregional control of metastases.
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Affiliation(s)
- M A Khan
- From the Department of Radiology (M.A.K., G.D.), John Hopkins University, Baltimore, Maryland
| | - G Deib
- From the Department of Radiology (M.A.K., G.D.), John Hopkins University, Baltimore, Maryland
| | - B Deldar
- St. George's University of London (B.D.), London, UK
| | | | - J S Barr
- Orthopedics (J.S.B.), University of Mississippi Medical Centre, Jackson, Mississippi
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Patel AM, Berger I, Wileyto EP, Khalid U, Torigian DA, Nachiappan AC, Barbosa EM, Gefter WB, Galperin-Aizenberg M, Gupta NK, Simone CB, Haas AR, Alley EW, Singhal S, Cengel KA, Katz SI. The value of delayed phase enhanced imaging in malignant pleural mesothelioma. J Thorac Dis 2017; 9:2344-2349. [PMID: 28932538 DOI: 10.21037/jtd.2017.07.86] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [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: 11/06/2022]
Abstract
BACKGROUND Cross-sectional imaging of malignant pleural mesothelioma (MPM) can underestimate the presence of local tumor invasion. Since accurate staging is vital optimal choice of therapy, techniques that optimize pleural imaging are needed. Here we estimate the optimal timing of MPM enhancement on magnetic resonance imaging (MRI). METHODS All MPM patients with intravenous (IV) contrast enhanced staging MRI between 2000-2016 at our institution were retrospectively selected for image analysis. Patients with incomplete imaging protocol and maximum pleural tumor thickness <1 cm were excluded. Quantitative measurements of tumor signal intensity were obtained on pre-contrast and post-contrast phases where MRI acquisition parameters were fixed. Using best-fit model curves, predicted maximum time points of enhancement were determined using a simulation of predicted values. Additionally, a qualitative assessment of tumor conspicuity was performed at all IV contrast time delays imaged. A statistical analysis assessed for correlation between qualitative lesion conspicuity and quantitative tumor enhancement. RESULTS Of the 42 MPM patients who had undergone staging MRI during the study period, 12 patients met the study criteria. Peak tumor enhancement was between 150 and 300 sec following IV contrast administration. Within this time window, 80% of patients are projected to have reached >80%, >85%, and >90% peak tumor enhancement. There was a statistically significant correlation between increasing tumor enhancement and subjective lesion conspicuity. CONCLUSIONS Optimal MPM enhancement on MRI likely occurs at a time delay between 2.5-5 min following IV contrast administration. Further study of delayed phase enhancement of MPM with dynamic contrast enhanced MRI is warranted.
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Affiliation(s)
- Akash M Patel
- Department of Radiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Ian Berger
- Department of Radiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - E Paul Wileyto
- Department of Radiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Urooj Khalid
- Department of Radiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Drew A Torigian
- Department of Radiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Arun C Nachiappan
- Department of Radiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Eduardo M Barbosa
- Department of Radiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Warren B Gefter
- Department of Radiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Maya Galperin-Aizenberg
- Department of Radiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Narainder K Gupta
- Department of Radiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Charles B Simone
- Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Andrew R Haas
- Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Evan W Alley
- Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Sunil Singhal
- Department of Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Keith A Cengel
- Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Sharyn I Katz
- Department of Radiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
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Patel AM, Green J, Jowhari F, Hookey L. Use of warm carbon dioxide insufflators does not affect intra-colonic gas temperature and has no effect on polyp detection rate during colonoscopy - a randomized controlled trial. Endosc Int Open 2017; 5:E683-E689. [PMID: 28691054 PMCID: PMC5500117 DOI: 10.1055/s-0043-107779] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 03/02/2017] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND AND STUDY AIMS Methods to improve polyp detection during colonoscopy have been investigated, with conflicting results for warm water irrigation. Carbon Dioxide (CO 2) warmed to 37 °C may have similar or more pronounced effects on bowel motility. This study aimed to assess whether warmed CO 2 would improve polyp detection compared to room temperature air insufflation. PATIENTS AND METHODS This was a double-blind, randomized controlled trial that enrolled 204 patients undergoing screening or surveillance outpatient colonoscopy. The primary outcome was polyp per patient detection rate. Secondary outcomes included adenoma per patient detection rates, bowel spasm, and patient comfort. RESULTS The trial was terminated after an interim analysis determined futility. Between the warmed CO 2 and room air groups, no significant differences were found in the per-colonoscopy polyp detection rate ( P = 0.57); overall polyp detection rate ( P = 0.69); or adenoma detection rates ( P = 0.74). More patients in the room temperature group had lower spasm scores (p = 0.02); however, there was a trend towards greater patient comfort in the warmed CO 2 group ( P = 0.054). An ex-vivo study showed a significant difference between exiting CO 2 temperature at the insufflator end vs. delivered CO 2 temperature at the colonoscope tip end. The temperature of insufflation at the tip of the colonoscope was not different when using warmed vs. unwarmed insufflation ( P = 0.62). CONCLUSION When compared with room air insufflation, warmed CO 2 insufflation did not affect polyp detection rates.
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Affiliation(s)
- Akash M. Patel
- Gastrointestinal Diseases Research Unit, Department of Medicine, Queen’s University, Kingston, Ontario
| | - Jordan Green
- Gastrointestinal Diseases Research Unit, Department of Medicine, Queen’s University, Kingston, Ontario
| | - Fahd Jowhari
- Gastrointestinal Diseases Research Unit, Department of Medicine, Queen’s University, Kingston, Ontario
| | - Lawrence Hookey
- Gastrointestinal Diseases Research Unit, Department of Medicine, Queen’s University, Kingston, Ontario,Corresponding author Lawrence Hookey Division of GastroenterologyHotel Dieu Hospital166 Brock StreetKingston, Ontario, CanadaK7L 5G2+613 544 3400, ext 2292+614 544 3114
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Ray DM, Srinivasan I, Tang SJ, Vilmann AS, Vilmann P, McCowan TC, Patel AM. Complementary roles of interventional radiology and therapeutic endoscopy in gastroenterology. World J Radiol 2017; 9:97-111. [PMID: 28396724 PMCID: PMC5368632 DOI: 10.4329/wjr.v9.i3.97] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Revised: 11/12/2016] [Accepted: 01/14/2017] [Indexed: 02/06/2023] Open
Abstract
Acute upper and lower gastrointestinal bleeding, enteral feeding, cecostomy tubes and luminal strictures are some of the common reasons for gastroenterology service. While surgery was initially considered the main treatment modality, the advent of both therapeutic endoscopy and interventional radiology have resulted in the paradigm shift in the management of these conditions. In this paper, we discuss the patient’s work up, indications, and complementary roles of endoscopic and angiographic management in the settings of gastrointestinal bleeding, enteral feeding, cecostomy tube placement and luminal strictures. These conditions often require multidisciplinary approaches involving a team of interventional radiologists, gastroenterologists and surgeons. Further, the authors also aim to describe how the fields of interventional radiology and gastrointestinal endoscopy are overlapping and complementary in the management of these complex conditions.
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Weng FL, Lee DC, Dhillon N, Tibaldi KN, Davis LA, Patel AM, Goldberg RJ, Morgievich M, Mulgaonkar S. Characteristics and Evaluation of Geographically Distant vs Geographically Nearby Living Kidney Donors. Transplant Proc 2017; 48:1934-9. [PMID: 27569925 DOI: 10.1016/j.transproceed.2016.03.042] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [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] [Received: 03/02/2016] [Accepted: 03/21/2016] [Indexed: 11/16/2022]
Abstract
BACKGROUND Living donor kidney transplant (LDKT) can be impeded by multiple barriers. One possible barrier to LDKT is a large physical distance between the living donor's home residence and the procuring transplant center. METHODS We performed a retrospective, single-center study of living kidney donors in the United States who were geographically distant (residing ≥150 miles) from our transplant center. Each distant donor was matched to 4 geographically nearby donors (<150 miles from our center) as controls. RESULTS From 2007 to 2010, of 429 live kidney donors, 55 (12.8%) were geographically distant. Black donors composed a higher proportion of geographically distant vs nearby donors (34.6% vs 15.5%), whereas Hispanic and Asian donors composed a lower proportion (P = .001). Distant vs nearby donors had similar median times from donor referral to actual donation (165 vs 161 days, P = .81). The geographically distant donors lived a median of 703 miles (25% to 75% range, 244 to 1072) from our center and 21.2 miles (25% to 75% range, 9.8 to 49.7) from the nearest kidney transplant center. The proportion of geographically distant donors who had their physician evaluation (21.6%), psychosocial evaluation (21.6%), or computed tomography angiogram (29.4%) performed close to home, rather than at our center, was low. CONCLUSIONS Many geographically distant donors live close to transplant centers other than the procuring transplant center, but few of these donors perform parts of their donor evaluation at these closer centers. Black donors comprise a large proportion of geographically distant donors. The evaluation of geographically distant donors, especially among minorities, warrants further study.
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Affiliation(s)
- F L Weng
- Renal and Pancreas Transplant Division, Saint Barnabas Medical Center, Livingston, New Jersey, USA; Rutgers School of Public Health, Department of Epidemiology, Piscataway, New Jersey, USA.
| | - D C Lee
- Ronald O. Perelman Department of Emergency Medicine, New York University School of Medicine, New York, New York, USA; Department of Population Health, New York University School of Medicine, New York, New York, USA
| | - N Dhillon
- Renal and Pancreas Transplant Division, Saint Barnabas Medical Center, Livingston, New Jersey, USA
| | - K N Tibaldi
- Renal and Pancreas Transplant Division, Saint Barnabas Medical Center, Livingston, New Jersey, USA
| | - L A Davis
- Renal and Pancreas Transplant Division, Saint Barnabas Medical Center, Livingston, New Jersey, USA
| | - A M Patel
- Renal and Pancreas Transplant Division, Saint Barnabas Medical Center, Livingston, New Jersey, USA
| | - R J Goldberg
- Renal and Pancreas Transplant Division, Saint Barnabas Medical Center, Livingston, New Jersey, USA
| | - M Morgievich
- Renal and Pancreas Transplant Division, Saint Barnabas Medical Center, Livingston, New Jersey, USA
| | - S Mulgaonkar
- Renal and Pancreas Transplant Division, Saint Barnabas Medical Center, Livingston, New Jersey, USA
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13
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Patel MH, Patel AM, Shah AM. Seroprevalence of HIV, HBV, HCV & RPR among cornea donor in the regional institute of ophthalmology. ACTA ACUST UNITED AC 2017. [DOI: 10.4103/2347-6486.240223] [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: 11/04/2022]
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14
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Kazimirko DN, Beam WB, Saleh K, Patel AM. Beware of positive pressure: coronary artery air embolism following percutaneous lung biopsy. Radiol Case Rep 2016; 11:344-347. [PMID: 27920858 PMCID: PMC5128362 DOI: 10.1016/j.radcr.2016.08.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2016] [Revised: 07/18/2016] [Accepted: 08/12/2016] [Indexed: 12/18/2022] Open
Abstract
Patients undergoing percutaneous lung biopsy are at risk of developing a systemic air embolism. Air embolism may manifest as a catastrophic iatrogenic event with ischemic insult to the end organs, with sites of least resistance such as coronary and cerebral circulation the most susceptible. We review the available literature and present a case of iatrogenic air embolism during computed tomography guided percutaenous lung biopsy under general anesthesia. Management, outcome, and periprocedural factors that may have contributed to the complication are discussed.
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Affiliation(s)
- Dmitriy N. Kazimirko
- Department of Radiology, University of Mississippi Medical Center, 2500 N State St, Jackson, MS 39216, USA
- Corresponding author.
| | - William B. Beam
- Department of Anesthesiology, Mayo Clinic, 200 First St SW, Rochester, MN, 55905, USA
| | - Khalid Saleh
- Department of Radiology, University of Mississippi Medical Center, 2500 N State St, Jackson, MS 39216, USA
| | - Akash M. Patel
- Department of Radiology, University of Mississippi Medical Center, 2500 N State St, Jackson, MS 39216, USA
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Affiliation(s)
- Thiwanka Wijeratne
- Queen's University; Division of Internal Medicine; 76 Stuart Street Kingston ON Canada K7L 2V7
| | - Akash M Patel
- Queen's University; Division of Gastroenterology; 76 Stuart Street Kingston ON Canada K7L 2V7
| | - Fahd Jowhari
- Queen's University; Division of Gastroenterology; 76 Stuart Street Kingston ON Canada K7L 2V7
| | - Nishardi T Wijeratne
- Queen's University; Division of Psychiatry; 76 Stuart Street Kingston ON Canada K7L 2V7
| | - William G Paterson
- Queen's University; Division of Gastroenterology; 76 Stuart Street Kingston ON Canada K7L 2V7
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16
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Patel V, Patel AM, McArdle JJ. Synaptic abnormalities of mice lacking toll-like receptor (TLR)-9. Neuroscience 2016; 324:1-10. [PMID: 26955780 DOI: 10.1016/j.neuroscience.2016.03.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Revised: 02/23/2016] [Accepted: 03/01/2016] [Indexed: 02/07/2023]
Abstract
Motor, sensory, and autonomic abnormalities are reported for toll-like receptor 9 (TLR9) knock-out (KO) mice. However, a physiological role of TLR9 in the nervous system is largely unknown. Since altered synaptic transmission can contribute to sensory and motor abnormalities, we evaluated neuromuscular junction (NMJ) function and morphology of TLR9 KO mice. Triangularis sterni nerve-muscle preparations were dissected from TLR9 KO and age-matched control mice. Two-electrode voltage clamp of the motor endplate revealed that the amplitude and frequency of miniature end plate currents (mEPCs) for TLR9 KO NMJs were significantly greater than control. In contrast, mean endplate current (EPC, 1Hz) amplitude was equivalent to control. The ratio of mean EPC to mean mEPC amplitude indicated a decline of quantal content (m) for TLR9 KO NMJs. Furthermore, m declined more rapidly than control in response to 50-Hz stimulus trains. A rightward shift of the mEPC amplitude distribution suggested formation of vesicles containing larger amounts of acetylcholine (ACh). Staining with rhodamine α-bungarotoxin revealed a significant decline of endplate size in TLR9 KO mice. This alteration may result from ACh-induced decline of acetylcholine receptor (AChR) expression resulting from increased frequency and amplitude of mEPCs. At the same time, excessive spontaneous vesicular ACh release may initiate retrograde suppression of excitation-secretion coupling. These data suggest a novel role of TLR9 in the development of the NMJ.
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Affiliation(s)
- V Patel
- Department of Pharmacology, Physiology, and Neuroscience, New Jersey Medical School-Rutgers University, Newark, NJ 07103, USA.
| | - A M Patel
- Department of Pharmacology, Physiology, and Neuroscience, New Jersey Medical School-Rutgers University, Newark, NJ 07103, USA
| | - J J McArdle
- Department of Pharmacology, Physiology, and Neuroscience, New Jersey Medical School-Rutgers University, Newark, NJ 07103, USA
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Affiliation(s)
- A M Patel
- Department of Plastic and Reconstructive Surgery, Rush University Medical Center, Chicago, IL, USA
| | - B Gregory
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
| | - R W Wysocki
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
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Patel AM, Amity CL, Frydrych LM, Jones DM, Goudeau D, Eng HF, Kyle D, Saul M, Solomon DH, Wisniewski SR, Moreland LW, Levesque MC. Does ACR/EULAR remission mean improved functional ability, quality of life and work productivity?: Table 1. Ann Rheum Dis 2012. [DOI: 10.1136/annrheumdis-2011-201230.36] [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: 11/04/2022]
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20
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Sottejeau Y, Patel AM, Gerber G, Pierre SV, Maixent JM. Effect of a novel Omegacoeur®/Doluperine® nutritional combination on human embryonic kidney cell viability. Cell Mol Biol (Noisy-le-grand) 2010; 56 Suppl:OL1400-OL1409. [PMID: 21062574] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2010] [Accepted: 09/09/2010] [Indexed: 05/30/2023]
Abstract
Holistica Laboratories (Eguilles, France) developed the nutritional supplements Omegacoeur® and Doluperine® based on two of the most ancient and unique dietary health traditions. Omegacoeur® is formulated to supply key active components of Mediterranean diet (omega 3,6,9 fatty acids, garlic, and basil) and the formulation of Doluperine® was based on the Ayurvedic tradition (curcuma, pepper, ginger extracts). Interestingly, recent studies suggest that an combination of the ingredients supplied by these two supplements could provide additional and previously unanticipated benefit through synergistic actions of some of their key components. However, the effect of such combination on human cell viability has not been investigated. In this present article, a review of the various effects of the individual compounds of the new combination and the reported active doses, and the result of a study of an combination of Omegacoeur® / Dolupérine® on Human Embryonic Kidney (HEK 293) cells. Incremental doses of 4 Omegacoeur® / Dolupérine® combinations prepared so that the molar ratio DHA (Docosahexaenoic acid) in Omegacoeur® / curcumin in Dolupérine® was kept constant, at 2.5 DHA / 1 curcumin, were added to the culture media. After 24h of incubation, cell viability was assessed by the trypan blue exclusion method. The data suggest that the combination of Omegacoeur® with Dolupérine® does not affect HEK 293 cells viability in the range of doses that have demonstrated beneficial effects in earlier studies.
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Affiliation(s)
- Y Sottejeau
- Department of Physiology and Pharmacology, College of Medicine, University of Toledo, Toledo, Ohio, USA
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Weng FL, Pancoska C, Patel AM. Fatal graft-versus-host disease presenting as fever of unknown origin in a pancreas-after-kidney transplant recipient. Am J Transplant 2008; 8:881-3. [PMID: 18294353 DOI: 10.1111/j.1600-6143.2008.02150.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Acute graft-versus-host disease (GVHD) is a rare complication of pancreas transplantation. We describe a 54-year-old male with type 1 diabetes who received a zero-antigen mismatched pancreas-after-kidney transplant from a pancreas donor who was homozygous at the HLA-B, -Cw, -DR, and -DQ alleles. Starting on postoperative day (POD) #22, the patient developed persistent fevers. Workup was notable only for low-grade cytomegalovirus viremia, which was treated. The fevers eventually disappeared. On POD #106, the patient was noted to have a diffuse erythematous rash. A skin biopsy was consistent with GVHD. Short tandem repeat DNA analysis of both peripheral blood lymphocytes and skin demonstrated mixed chimerism, confirming the diagnosis of GHVD. Soon after diagnosis, the patient developed pancytopenia and fevers and died of multiorgan failure on POD #145. Transplant clinicians should consider GVHD as a possible, although admittedly rare, cause of fevers of unknown origin in recipients of pancreas transplants.
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Affiliation(s)
- F L Weng
- Renal and Pancreas Transplant Division, Saint Barnabas Medical Center, Livingston, NJ, USA.
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Patel AM, Pancoska C, Mulgaonkar S, Weng FL. Renal transplantation in patients with pre-transplant donor-specific antibodies and negative flow cytometry crossmatches. Am J Transplant 2007; 7:2371-7. [PMID: 17845571 DOI: 10.1111/j.1600-6143.2007.01944.x] [Citation(s) in RCA: 98] [Impact Index Per Article: 5.8] [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: 01/25/2023]
Abstract
The clinical significance of pre-transplant donor-specific antibodies (DSA), despite negative cytotoxicity and flow cytometry crossmatches (FCXMs), is unknown. We performed a retrospective cohort study of 60 living donor renal transplant recipients, all with pre-transplant cytotoxicity and T-cell and B-cell FCXMs that were negative. Twenty recipients had pre-transplant DSA detected by enzyme-linked immunosorbent assays (ELISA) and/or microbead methods. Forty contemporaneous DSA-negative controls were selected. In the DSA-positive group, after a median follow-up of 8.2 months (25-75% range, 5.4-22.8 months), patient survival was 100% and allograft survival was 95.0%. Acute humoral rejection (AHR) developed in four patients (20.0%). Three of the AHR episodes occurred within the first month post-transplant. Median serum creatinine at last follow-up was 1.3 mg/dL (25-75% range, 1.0-1.6 mg/dL), versus 1.1 mg/dL (25-75% range, 0.9-1.4 mg/dL) in the DSA-negative controls (p = 0.29). Only one of the 40 controls developed AHR (2.5%). Pre-transplant DSA was associated with a significantly increased incidence of AHR (p = 0.02 by log-rank test). In conclusion, despite negative pre-transplant cytotoxicity and FCXMs, renal transplant recipients with pre-transplant DSA detected by solid-phase methods may have an increased incidence of AHR and require close monitoring post-transplant.
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Affiliation(s)
- A M Patel
- Renal and Pancreas Transplant Division, Saint Barnabas Medical Center, Livingston, NJ, USA
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Mathis AS, Liu MT, Adamson RT, Nambi SS, Patel AM. Retrospective analysis of early steroid-induced adverse reactions in kidney and kidney-pancreas transplant recipients. Transplant Proc 2007; 39:199-201. [PMID: 17275506 DOI: 10.1016/j.transproceed.2006.10.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2006] [Indexed: 01/14/2023]
Abstract
Corticosteroids (steroids) are associated with numerous adverse drug reactions (ADRs). Long-term ADRs are well characterized, but there are limited data on the incidence and likelihood of short-term ADRs. We sought to determine the incidence of ADRs potentially related to early administration of steroids in kidney and kidney-pancreas transplant recipients and to determine the probability that the ADR was due to the steroid. We retrospectively evaluated the records of all eligible kidney or pancreas-kidney transplants during 2003. ADRs were rated by two reviewers according to the Naranjo algorithm, and identified as "definite," "probable," "possible," or "doubtful." ADRs were identified in 100% of patients (n = 103) by 8.2 +/- 4.9 days. The mean ADRs per patient were 3.26 +/- 1.04. Weight gain occurred in 79.6%, hypertension in 71.8%, diabetes mellitus in 52.4%, hyperglycemia in 47.6%, leukocytosis in 31.1%, insomnia in 27.2%, anxiety in 10.7%, and psychosis in 1.9%. Based on mean interinvestigator score, leukocytosis was judged as "probable" and weight gain and psychosis were "possible to probable." Diabetes, hyperglycemia, hypertension, and insomnia were "possible" and anxiety was "possible to doubtful." These results provide evidence of the incidence and likelihood of early steroid-related ADRs.
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Affiliation(s)
- A S Mathis
- Saint Barnabas Medical Center-Pharmacy, Livingston, NJ 07039, USA.
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Kumar S, Patel AM, Vaghela DU, Singh K, Solanki RN, Shah HR. The brain arterio-venous malformations (BAVMs): A pictorial essay with emphasis on role of imaging in management. Indian J Radiol Imaging 2006. [DOI: 10.4103/0971-3026.32341] [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: 11/04/2022] Open
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Patel AM, Vaghela DU, Kumar S, Shah UA, Shah AK, Shah HR. A rare case of melorrheostosis with articular involvement: MR appearance. Indian J Radiol Imaging 2006. [DOI: 10.4103/0971-3026.32283] [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: 11/04/2022] Open
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Kumar S, Shah AK, Patel AM, Shah UA. CT and MR images of the flat bone Osteochondromata from head to foot: A pictorial essay. Indian J Radiol Imaging 2006. [DOI: 10.4103/0971-3026.32277] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Patel AM. Appropriate consent and referral for general anaesthesia — a survey in the Paediatric Day Care Unit, Barnsley DGH NHS Trust, South Yorkshire. Br Dent J 2004; 196:275-7; discussion 271. [PMID: 15017416 DOI: 10.1038/sj.bdj.4811039] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2002] [Accepted: 05/15/2003] [Indexed: 11/09/2022]
Abstract
BACKGROUND In November 1998 the General Dental Council introduced guidelines for dental practitioners when referring a patient for general anaesthesia (GA). The practitioner is required to explain the risks associated with GA and the alternatives, give a detailed medical history and a clear justification for providing GA in the letter of referral. METHOD A survey was administered on 202 parents or guardians, which aimed to investigate whether they felt that their dental practitioners had advised them of any risks of GA prior to referral. A record was also made if any reasons were given for the provision of GA in the letter of referral. RESULTS The majority of the parents or guardians (66%) felt that they were not informed of any of the risks of GA and 25% felt that they were. From the letters of referral, 37% contained a reason for GA and 63% did not give any reason or justification for GA. CONCLUSION There is evidence that referring practitioners do not adequately explain the risks of the anaesthetic to parents or guardians of children undergoing GA. There is also a lack of clear justification in the letters of referral for providing GA. PRACTICE IMPLICATION It is essential that the alternatives and the risks of GA are discussed and if GA is still required, a clear justification should be contained in the letter of referral as part of informed consent. More importantly the referring practitioner should keep a contemporaneous record of this, preferably with a signature from the parent or guardian on agreement of referral.
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Affiliation(s)
- A M Patel
- Orthodontic Department, Birmingham Dental Hospital, St. Chad's Queensway, Birmingham B4 6NN.
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Walpola HC, Siskind V, Patel AM, Konstantinos A, Derhy P. Tuberculosis-related deaths in Queensland, Australia, 1989-1998: characteristics and risk factors. Int J Tuberc Lung Dis 2003; 7:742-50. [PMID: 12921150] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023] Open
Abstract
OBJECTIVE To review factors associated with TB-related deaths in Queensland, Australia. DESIGN Review of data for TB patients dying before treatment completion; demographic and clinico-pathological comparison of TB-related deaths with other notified patients after exclusion of losses to follow-up; matched case-control study of co-morbid conditions in patients under 75 years. RESULTS Of 1003 tuberculosis cases notified between 1989 and 1998, 127 died before completing anti-tuberculosis treatment. Tuberculosis was the main cause of death in 53 cases, a significant contributor in 34 and unrelated in 40, giving a TB-related case fatality rate of 8.7%. Decedents were older on average, except among indigenous Australians (IA); age-adjusted case fatality rates did not vary significantly among ethnic groups. Pulmonary and disseminated TB, coexistent malnutrition, renal disease and liver disease increased the risk of death. HIV infection increased the risk of dying, but was uncommon among Queensland cases. Neither sputum smear positivity nor drug resistance was associated with risk of death. Twenty-five TB-related deaths occurred before diagnosis, with significant overrepresentation of IA. Most had serious co-morbidities and symptomatic pulmonary disease. Seven socially or geographically isolated decedents did not access documented health care for tuberculosis. CONCLUSIONS Fatality was related to older age, disseminated disease and co-morbidity. Dying undiagnosed from tuberculosis was associated with respiratory co-morbidity and social and geographical isolation, mainly in the aged in low TB risk populations and in IA in remote regions.
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Affiliation(s)
- H C Walpola
- Queensland Health, Specialised Health Services, Annerley, Queensland, Australia
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Williams PA, Papadakis SJ, Patel AM, Falvo MR, Washburn S, Superfine R. Torsional response and stiffening of individual multiwalled carbon nanotubes. Phys Rev Lett 2002; 89:255502. [PMID: 12484895 DOI: 10.1103/physrevlett.89.255502] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2002] [Indexed: 05/20/2023]
Abstract
We report on the characterization of torsional oscillators which use multiwalled carbon nanotubes as the spring elements. Through atomic-force-microscope force-distance measurements we are able to apply torsional strains to the nanotubes and measure their torsional spring constants, and estimate their effective shear moduli. The data show that the nanotubes are stiffened by repeated flexing. We speculate that changes in the intershell mechanical coupling are responsible for the stiffening.
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Affiliation(s)
- P A Williams
- Department of Physics and Astronomy, University of North Carolina at Chapel Hill, 27599, USA
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Abstract
Hypersensitivity pneumonitis (extrinsic allergic alveolitis) caused by inhaled allergens can progress to disabling or even fatal end-stage lung disease. The only truly effective treatment is early recognition and control of exposure. Although patients produce antibody exuberantly, the immunopathogenesis involves cellular immunity--notably, CD8(+) cytotoxic lymphocytes, multinucleate giant cell granulomas, and ultimately interstitial fibrosis. Many causative agents have been recognized in occupational dusts or mists, but most current new cases arise from residential exposure to pet birds (pigeons and parakeets), contaminated humidifiers, and indoor molds. The symptoms and physical findings are nonspecific. Serum IgG containing high titers of specific antibody to the offending antigen is elevated. Pulmonary function tests show restrictive and diffusion defects with hypoxemia, especially after exercise. Occasionally, small airways disease causes obstruction. Radio-graphic changes vary according to the stage of the disease and are best evaluated by means of high-resolution computed tomography. In typical cases, the history of a known exposure and the presence of a characteristic interstitial lung disease with serologic confirmation of IgG antibody to the offending antigen suffice for diagnosis. In more obscure cases, observation of changes after a natural environmental exposure, bronchoalveolar lavage, and lung biopsy might be indicated. Among the many questions that remain are the following: What is the prevalence of hypersensitivity pneumonitis and how often is it the cause of chronic interstitial fibrosis? What is the long-term prognosis? Why do most individuals exposed to these antigens develop a vigorous antibody response whereas only a few develop the disease? How does exposure to endotoxin and cigarette smoking affect the disease? To answer these questions, standardized and validated clinical laboratory immunochemical tests are needed, in addition to a systematic approach to diagnosis, classification of disease severity, risk assessment, and management. This review is limited to the disease caused by airborne allergens and focuses on its immunopathogenesis, eliciting agents, clinical manifestations, diagnosis, management, and prognosis.
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Affiliation(s)
- A M Patel
- Department of Internal Medicine, Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, MN 55905, USA
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Williams RO, Patel AM, Barron MK, Rogers TL. Investigation of some commercially available spacer devices for the delivery of glucocorticoid steroids from a pMDI. Drug Dev Ind Pharm 2001; 27:401-12. [PMID: 11448047 DOI: 10.1081/ddc-100104315] [Citation(s) in RCA: 17] [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: 11/03/2022]
Abstract
Five commercially available spacers were investigated to determine their influence on the percentage of drug retained in the spacer device, percentage fine particle fraction (FPF), percentage deposited in the induction port, mass median aerodynamic diameter (MMAD), and geometric standard deviation (GSD). Betamethasone valerate (BMV) and triamcinolone acetonide (TAA) were used as model drugs in the pressurized metered dose inhaler (pMDI) formulations containing the propellant HFA 134a. The BMV was dissolved in an ethanol/HFA 134a system, and the TAA was suspended in HFA 134a using ethanol as a dispersing agent. The metering chamber volume of the valve was either 50 microl or 150 microl. The spacer devices investigated included the ACE, Aerochamber, Azmacort, Easivent, and Ellipse spacers. Each spacer device was attached to an Andersen Cascade Impactor powered by a vacuum pump. Cascade impaction data were used to derive the percentage drug deposited in the induction port, MMAD, GSD, and FPF. The BMV particles emitted from the spacers were finer than the TAA particles because the dissolved drug precipitated as the cosolvent evaporated. The TAA particles had significantly larger MMADs because many undissolved drug particles were contained within each droplet following actuation. After evaporation of the liquid continuous phase, the suspended drug aggregated to form larger agglomerates than those particles precipitated from the BMV pMDI solution droplets. The addition of a spacer device lowered the MMAD to less than 4.7 microm for particles from both the BMV pMDI solution and the TAA pMDI suspension. The addition of a spacer device also lowered the percentage drug deposited in the induction port. The FPF was significantly increased when a spacer device was used. The MMAD significantly decreased when a spacer device was added for the two model drugs when using the 150-microl metering valves, but the difference was not statistically significant when the 50-microl valves were used (P < .05). The GSD was not influenced by the use of a spacer device. The use of a spacer device will enhance pMDI therapy by reducing the amount of drug deposited in the oropharyngeal region, which will lead to fewer instances of local and systemic side effects. In addition, the spacer devices investigated will allow a higher dose of drug to reach the deep lung, which may permit the use of lower dosage regimens with increased therapeutic efficacy.
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Affiliation(s)
- R O Williams
- College of Pharmacy, University of Texas at Austin, 78712-1074, USA.
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Abstract
The ultimate goals of managing asthma are to eliminate death, prevent or promptly treat exacerbations, and maximize the quality of life and health status of patients. Current strategies include appropriate education, trigger control, and timely access to effective pharmacotherapy and follow-up. Internet-based technologies have emerged as potentially powerful tools to enable meaningful communication and proactive partnership in care for various medical conditions. The main types of Internet-based applications for asthma management include remote monitoring and feedback between health professionals and their patients; online education and marketing for either patients or professionals; networking and collaborative research; and administrative oversight through policy making, planning, and decision support. With increased understanding of integrated disease management and the technostructural as well as psychodynamic issues related to Internet use, further refinement and evolution of the Internet and related technologies may drastically improve the way we monitor, educate, treat, and establish policies for this global problem while attending to individual or local community needs. This review presents a conceptual overview of the current challenges and use of the Internet for improving asthma management through timely and tailored education and appropriate access to health care expertise.
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Affiliation(s)
- A M Patel
- Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, Minnesota 55905, USA.
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Abstract
About one third of the US adult population experiences symptoms of gastroesophageal reflux on a monthly basis. Asthma is present in about 5% of the same population. This article reviews and summarizes the literature in the following areas: (1) prevalence of gastroesophageal reflux disease (GERD) in asthmatic patients based on clinical symptoms, endoscopic esophagitis, and 24-hour ambulatory esophageal pH recordings; (2) proposed pathophysiologic mechanisms linking the 2 diseases; and (3) medical and surgical treatment trial results of antireflux therapy for asthmatic patients. Asthmatic patients appear to have an increased prevalence of GERD symptoms and 24-hour esophageal acid exposure. The clinical management of these patients remains controversial. Common management approaches to GERD in asthmatic patients include medical therapy with a proton pump inhibitor and/or antireflux surgery, which improve asthma symptoms in many patients but minimally affect pulmonary function.
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Affiliation(s)
- J A Alexander
- Division of Gastroenterology and Hepatology and Internal Medicine, Mayo Clinic, Rochester, Minn. 55905, USA.
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Abstract
OBJECTIVES The purpose of this study was to evaluate the rate of recognition of atrial fibrillation (AF), use of warfarin and prevalence of cerebrovascular accident (CVA) in paced versus unpaced patients during admission to a tertiary care teaching hospital. BACKGROUND The presence of AF underlying a continuously paced rhythm may be under recognized and result in a lower rate of anticoagulation and higher incidence of CVA. METHODS The identification of AF on 12 lead electrocardiogram (ECG) and telemetry, "optimal use" of anticoagulants that is, warfarin or aspirin, when warfarin is contraindicated and history of prior CVA was studied in three groups: 1) group A with continuously paced rhythm on ECG and telemetry (n = 30), 2) group B with intermittently paced rhythm on ECG and telemetry (n = 59), and 3) group C with persistent AF and no permanent pacemaker (n = 50). RESULTS The identification and documentation of AF was significantly lower in the continuously paced group A (20%) versus the intermittently paced group B (44%). Both groups A and B were substantially lower than unpaced controls. "Optimal use" of anticoagulants was significantly lower in group A (40%) compared with groups B (78%) and C (72%) but was not different between groups B and C. The prevalence of prior CVA was not significantly different between the three groups. CONCLUSIONS All ECGs in patients with paced rhythm should be examined closely for underlying AF to prevent under-recognition and under-treatment with anticoagulants.
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Affiliation(s)
- A M Patel
- Department of Cardiac Electrophysiology, William Beaumont Hospital, Royal Oak, Michigan 48073-6769, USA
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Abstract
BACKGROUND There are few studies that examine referral patterns for asthma and few studies that examine the referring physicians' reasons for consultation. OBJECTIVE The purpose of this study was to survey generalist physicians on their referral patterns for adult patients with asthma. METHODS We mailed a questionnaire to all the staff (faculty) in the Department of Family Medicine and the Division of Community Internal Medicine at the Mayo Clinic in Rochester, Minnesota. There were 37 completed questionnaires (18 family medicine and 19 internal medicine) out of a total of 58 for a response rate of 64%. The survey asked what were reasons for consultation, whether allergists or pulmonologists were preferred, and the characteristics of a good consultation. RESULTS We asked respondents to indicate "how often you consult a specialist for an adult asthma patient" for a variety of clinical indications. The percentage responding "always" (for the top five indications) were if the patient requests one (46%), for allergen immunotherapy (38%), for single life-threatening attack (27%), for allergy testing (14%), and for steroid-dependent asthma or poorly controlled asthma (11%). Twenty-seven percent of respondents generally consulted allergists only, 22% generally consulted pulmonologists only, 3% indicated both, while 46% had no preference. Respondents did express a preference for a pulmonologist when the reported reason for the consultation was diagnosis of asthma uncertain, chronic cough, asthma in smoker, exercise training, or for an allergist when the reported reason for consultation was allergy evaluation or immunotherapy. The respondents indicated that the top six characteristics of a good consultation were the following: clear recommendations, clinically appropriate recommendations, high patient satisfaction, including recommendations for future management scenarios, including educational content in the consultation, and calling the referring physician before requesting a secondary consultation. CONCLUSIONS These results suggest that while consultation occurs often for severe or uncontrolled asthma, some asthma patients who may benefit from consultation may not be seeing the specialist. There were no systematic preferences for consultations with allergists versus pulmonologists for asthma although for some clinical indications pulmonologists or allergists were favored. Referring physicians value clear, clinically appropriate recommendations.
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Affiliation(s)
- J T Li
- Mayo Clinic and Foundation, Rochester, Minnesota 55905, USA
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Abstract
Favorable results using fibrin sealants in vascular surgery and soft tissue reconstruction have prompted investigation of these biologic adhesives for orthopedic applications. One important recent application was as a sealant for periosteal grafts applied to defects in articular surfaces, a procedure that contained injected chondrocytes cultured in vitro. The low and variable adhesive strength of autologous fibrin substances prompted our investigation of allogeneic fibrin. An in vitro test method was developed to investigate the use of a fibrin sealant for attaching periosteal (bovine) patches to articular cartilage (bovine). Dermis-dermis (porcine) adhesion also was evaluated. In tests of the periosteum-to-cartilage bond performed in a physiological environment, we determined the effects of the following variables on the adhesive shear strength: set time, source of fibrinogen (bovine versus human), and fibrinogen concentration. A specially designed test rig was developed to avoid nonshear force components. Adhesive shear strength increased with fibrin set time for both fibrinogen concentrations and sources (p <.03). The 30-min set time yielded data with less variance than the 5-min set time in all cases except with the higher human fibrinogen concentration (50-80 mg/mL). While there was a trend at each set time towards greater shear strength with increased protein concentration (50-80 mg/mL versus 25-40 mg/mL), only the 5-min trial of the bovine product provided a significant advantage (p <.006). There was no significant difference in adhesive strength between the fibrin products produced with human and bovine fibrinogen. The periosteum-cartilage adhesive strengths obtained in our model were comparable to values recorded for the dermis-dermis bonding. The greater strength at the 30-min set time suggests that a certain time period of joint immobilization might be beneficial in procedures in which grafts are glued to articular cartilage. This study has shown that adhesive strengths achieved with fibrin glues in treating skin wounds also can be achieved in the attachment of periosteal grafts to articular cartilage.
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Affiliation(s)
- T E Orr
- Department of Orthopedic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.
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Bosch RR, Smeets RL, Sleutels F, Patel AM, Emst-de Vries SE, Joep J, de Pont HH, Willems PH. Concerted action of cytosolic Ca2+ and protein kinase C in receptor-mediated phospholipase D activation in Chinese hamster ovary cells expressing the cholecystokinin-A receptor. Biochem J 1999; 337 ( Pt 2):263-8. [PMID: 9882623 PMCID: PMC1219960] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Receptor-mediated activation of phosphatidylcholine phosphatidohydrolase or phospholipase D (PLD) was studied in Chinese hamster ovary (CHO) cells expressing the cholecystokinin-A (CCK-A) receptor. Cells were labelled with [3H]myristic acid for 24 h and PLD-catalysed [3H]phosphatidylethanol formation was measured in the presence of 1% (v/v) ethanol. Cholecystokinin-(26-33)-peptide amide (CCK8) increased PLD activity both time- and dose-dependently. Maximal activation of protein kinase C (PKC) with 1 microM PMA or sustained elevation of the cytosolic free Ca2+ concentration ([Ca2+]i) with 1 microM thapsigargin increased PLD activity to 50% and 70% of the maximal value obtained with CCK8 respectively. The stimulatory effects of CCK8, PMA and thapsigargin were abolished in cells in which PKC was downregulated or inhibited by chelerythrine. PMA/Ca2+-stimulated PLD activity was absent in a homogenate of PKC-downregulated cells but could be restored upon addition of purified rat brain PKC. CCK8-induced PLD activation was inhibited by 90% in the absence of external Ca2+, demonstrating that receptor-mediated activation of PKC in itself does not significantly add to PLD activation but requires a sustained increase in [Ca2+]i. Taken together, the results presented demonstrate that, in CHO-CCK-A cells, receptor-mediated PLD activation is completely dependent on PKC, but that the extent to which PLD becomes activated depends largely, if not entirely, on the magnitude and duration of the agonist-induced increase in [Ca2+]i.
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Affiliation(s)
- R R Bosch
- Department of Biochemistry, University of Nijmegen, P.O. Box 9101, NL-6500 HB Nijmegen, The Netherlands
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Bosch RR, Patel AM, Van Emst-de Vries SE, Smeets RL, De Pont JJ, Willems PH. U73122 and U73343 inhibit receptor-mediated phospholipase D activation downstream of phospholipase C in CHO cells. Eur J Pharmacol 1998; 346:345-51. [PMID: 9652379 DOI: 10.1016/s0014-2999(98)00070-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [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: 02/08/2023]
Abstract
The aminosteroid 1-(6-¿[17beta-3-methoxyestra- 1,3,5(10)-trien- 17-yl]-amino¿hexyl)- 1H-pyrrole-2,5-dione (U73122) and its inactive analogue 1-(6-¿[17beta-3-methoxyestra-1,3,5(10)-trien- 17-yl]-amino¿hexyl-2,5-pyrrolidine-dione (U73343) are widely used to study the involvement of G protein-coupled 1-phosphatidylinositol-phosphodiesterase, or phospholipase C, in receptor-mediated cell activation. The present work shows that both aminosteroids inhibit cholecystokinin-(26-33)-peptide amide (CCK-8)-induced phospholipase D activation equipotently in Chinese hamster ovary cells expressing the cholecystokinin-A receptor (CHO-CCK(A) cells). In addition, the two aminosteroids virtually completely inhibited thapsigargin- and 12-O-tetradecanoylphorbol 13-acetate (TPA)-induced phospholipase D activation. Since the latter two drugs mimic inositol 1,4,5-trisphosphate-mediated Ca2+ mobilisation and 1,2-diacylglycerol-mediated protein kinase C activation. respectively, this suggests that both U73122 and U73343 act downstream of phospholipase C to inhibit receptor-mediated phospholipase D activation. U73122, but not U73343. effectively inhibited both TPA/Ca2+-stimulated phospholipase D activation and TPA/phosphatidylserine-stimulated protein kinase C activation in a homogenate of CHO-CCK(A) cells. The data presented suggest that U73122 may act at the level of protein kinase C to inhibit activation of phospholipase D. The exact site of action of U73343 is presently unknown.
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Affiliation(s)
- R R Bosch
- Department of Biochemistry, University of Nijmegen, Netherlands
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40
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Konstantinos A, Patel AM. Missed opportunities for prevention of tuberculosis. Int J Tuberc Lung Dis 1998; 2:345-7. [PMID: 9559410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
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Adlakha A, Demick DS, Patel AM. A woman with recurrent bronchitis and asthma. Hosp Pract (1995) 1998; 33:189, 193-4, 199. [PMID: 9484304 DOI: 10.1080/21548331.1998.11443645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Abstract
Asthma is a common, chronic inflammatory disorder of the airways associated with pronounced health and economic consequences. Consistent and effective education that promotes an active partnership with patients remains the cornerstone for managing asthma. Identification and control of asthma triggers, regular monitoring of lung function, and adequate pharmacologic therapy are three other critical components. In this article, we describe several practical considerations for developing a collaborative, multidisciplinary approach to asthma care that emphasizes patient education and strengthens the partnership between patients and health-care professionals.
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Affiliation(s)
- A M Patel
- Division of Pulmonary and Critical Care Medicine, Mayo Clinic Rochester, Minnesota 55905, USA
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Patel AM, Spector M. Tribological evaluation of oxidized zirconium using an articular cartilage counterface: a novel material for potential use in hemiarthroplasty. Biomaterials 1997; 18:441-7. [PMID: 9061186 DOI: 10.1016/s0142-9612(96)00152-4] [Citation(s) in RCA: 78] [Impact Index Per Article: 2.9] [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: 02/03/2023]
Abstract
Problems with total joint replacement that have surfaced in recent years have made reconsideration of more conservative hip reconstructive procedures compelling. Moreover, procedures such as hemiarthroplasty might benefit from newly developed materials that could provide more favourable tribological performance when employed as a counterface for articulation with articular cartilage. The objective of this study was to evaluate the tribology of a new biomaterial, oxidized zirconium, with articular cartilage in a laboratory test apparatus. Oxidized zirconium components are produced by oxidizing the zirconium alloy to form a relatively thick (7 microns), adherent, abrasion-resistant ceramic surface. We found that the coefficient of friction of bovine articular cartilage rubbed against oxidized zirconium was lower than with cobalt-chromium alloy control surfaces, and that there was a trend toward less wear with oxidized zirconium. A defined layer of degraded tissue was found on the surface of the articular cartilage specimens, providing some indication of the mechanism of wear. Results of this study warrant further investigation of oxidized zirconium as the bearing surface for hemiarthroplasty.
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Affiliation(s)
- A M Patel
- Department of Orthopedic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
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Konstantinos A, Dawson DJ, Patel AM. What's in a name ... TB or not TB? Int J Tuberc Lung Dis 1997; 1:91-2. [PMID: 9441071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
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45
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Patel AM, Incognito LS, Schechter GL, Wasilenko WJ, Somers KD. Amplification and expression of EMS-1 (cortactin) in head and neck squamous cell carcinoma cell lines. Oncogene 1996; 12:31-5. [PMID: 8552396] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Amplification of chromosome 11q13 DNA sequences is detected in approximately 30% of primary head and neck squamous cell carcinomas (HNSCC). The amplified region includes genes for cyclin D1, hst-1, int-2, and more recently, ems-1. Ems-1 encodes an 80/85kd cytoskeletal associated protein termed cortactin, which has been shown to bind F-actin and is a pp60src substrate. We investigated 16 HNSCC cell lines for ems-1 DNA amplification and gene expression by western blotting and immunofluorescence using mAb 4F11. Amplification of ems-1 DNA was detected in 8/16 (50%) cell lines and was related directly to over-expression of cortactin by western blotting and immunofluorescence. Western blotting detected both forms of cortactin, p80 and p85, at equal intensity. Immunofluorescent staining revealed low levels of cortactin localized to the cytoplasm and surface membrane in normal bronchial epithelial cells and tumor cell cultures with single copy ems-1 DNA. In contrast, tumor cell cultures with ems-1 DNA amplification demonstrated intense, homogeneous cortactin cytoplasmic staining. These results suggest that overexpression of p80/85 may be a useful marker to identify 11q13 amplification, a molecular alteration correlated with the presence of lymph node metastasis in head and neck cancer.
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Affiliation(s)
- A M Patel
- Department of Microbiology/Immunology, Eastern Virginia Medical School, Norfolk, Virginia 23501, USA
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Abstract
The mechanism of segmental decay of the uncB sequence near the 5' end of the 7-kb Escherichia coli unc operon mRNA was investigated. Northern (RNA) blots of mRNA expressed from a plasmid carrying the uncBE portion of the operon revealed that the uncB message was rapidly degraded by multiple internal cleavages which resulted in the formation of at least five discrete species having a common 3' end. Turnover studies indicated that processing rapidly converted all species to the smallest. Identification of the 5' ends by primer extension analysis revealed that the cleavages were made either in the uncB coding region or in the intercistronic region between uncB and uncE, the latter being the most 3' cleavage. An rne mutant strain contained much higher levels of the uncBE message, implying that RNase E, the product of the rne gene, is essential for the normal degradation of uncB, and a number of the 5' ends were not detected in the rne mutant. The cleavage sites in chromosomally encoded unc mRNA were also identified by primer extension. These studies reveal that the segmental decay of the uncB region of unc mRNA occurs rapidly through a series of endonucleolytic cleavages. The rapid decay of uncB is expected to play a role in limiting expression of this gene relative to that of the other genes of the operon.
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Affiliation(s)
- A M Patel
- Department of Biochemistry, University of Western Ontario, London, Canada
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47
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McKeon J, Patel AM. Antituberculous therapy and acute liver failure. Lancet 1995; 345:1170-1. [PMID: 7723556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Abstract
Potent antibiotics are required to cure tuberculosis and reduce the burden of illness in the community. Minor adverse effects are commonly encountered and can be managed by reassurance and explanation. Significant hypersensitivity reactions require cessation of all antituberculosis drugs. Adverse effects should be treated appropriately. An effective antituberculosis regimen should be reestablished as soon as possible. Desensitisation may be necessary if suitable alternative drugs cannot be used. In the event of drug-induced hepatitis, all hepatotoxic drugs should be ceased until symptoms resolve and liver function tests return to normal. Other significant direct toxic effects should be promptly detected and appropriately treated. A thorough knowledge of potential adverse reactions and pharmacokinetics is essential for any physician using antituberculosis drugs.
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Affiliation(s)
- A M Patel
- Queensland Health Chest Clinic, Brisbane, Australia
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49
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Abstract
Gossypibomas, masses of retained cotton materials, may produce a variety of postoperative complications. This case report of hemoptysis of 18 months' duration and cavitating chest masses in a 62-year-old man with previous cardiac operations illustrates several salient features about the presentation, differential diagnosis, and management of gossypibomas.
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Affiliation(s)
- A M Patel
- Division of Thoracic Diseases and Internal Medicine, Mayo Clinic, Rochester, Minn
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50
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Abstract
Metastatic spread to subcarinal lymph nodes in patients with bronchogenic carcinoma generally indicates unresectability. Transcarinal needle aspiration of the main carina (TCNA) has been used to obviate the need for more invasive procedures, particularly thoracic surgery. Of 510 transbronchial needle aspirations performed at our institution from 1983 to 1991, 88 (17 percent) were from the main carina in patients with bronchogenic carcinoma. We reviewed these 88 TCNA procedures to assess our experience with TCNA in the staging of lung cancer. The TCNA results were positive in 32 of 88 (36 percent) patients (20 non-small-cell cancers, 12 small-cell lung cancers). Following bronchoscopy, TCNA was the only evidence of unresectability in all 20 patients with non-small-cell lung cancer and was the only mode of diagnosis in 5 of 12 (42 percent) patients with small-cell lung cancer. Thirteen patients with non-small-cell lung cancer and positive TCNA also had positive bronchial secretion cytologic studies. Five of these patients had further subcarinal sampling and in all cases metastatic involvement was confirmed. TCNA was positive in 29 of 67 (43 percent) patients with radiographic evidence of mediastinal adenopathy. Of the remaining 38 patients with radiographic evidence of mediastinal adenopathy and negative TCNA results, 23 patients had further mediastinal sampling with mediastinoscopy or thoracotomy and in all cases mediastinal spread of cancer was established. Nineteen of 58 (33 percent) patients with an endoscopically normal-appearing main carina had a positive TCNA, while 13 of 30 (43 percent) patients with broadening or widening of the main carina had positive TCNA results. There were no complications. We conclude that TCNA is often a safe and useful staging modality in patients with bronchogenic carcinoma.
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Affiliation(s)
- J P Utz
- Division of Thoracic Diseases and Internal Medicine, Mayo Medical Center, Rochester, Minn. 55905
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