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Tripathy NK, Mishra SK, Nathan G, Srivastava S, Gupta A, Lingaiah R. A Rapid Method for Determination of Serum Methotrexate Using Ultra-High-Performance Liquid Chromatography-Tandem Mass Spectrometry and Its Application in Therapeutic Drug Monitoring. J Lab Physicians 2023; 15:344-353. [PMID: 37564228 PMCID: PMC10411162 DOI: 10.1055/s-0042-1760668] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Objectives Methotrexate (MTX) has anticancer therapeutic potential with multiple doses-related adverse effects and toxicities. Immunoassays for therapeutic monitoring of serum MTX have their own limitations. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) is considered as the reference method; however, commercially availability of them is limited. We aimed to adapt/develop an in-house LC-MS/MS method for therapeutic monitoring of serum MTX. Materials and Methods Serum protein precipitation was performed using acetonitrile-water containing 250 μM solution of aminoacetophenone as internal standard (IS). Chromatographic separation was achieved on a C18 column with mobile phase of 0.1% solution of formic acid (solvent A) and acetonitrile (solvent B) at a flow rate of 0.4 mL/min. MS was performed under positive ion mode with mass transition for MTX and IS as m/z 455.1→308.1 and 136.2→94.1, respectively. The method was validated by following Bioanalytical Method Validation Guidance for Industry, 2018 and applied on leukemia patients' samples on MTX therapy. Results The correlation coefficient of eight serially diluted calibration standards of 0.09 to 12.5 μM was >0.99 and had linearity with > 95% precision and accuracy at analytical quality control levels. The lower limit of MTX quantification achieved was 0.09 μM with good intensity and sharp peak as compared with blank sample. The total run time of the assay was 5 minutes. The serum MTX levels obtained by this method in leukemia patients exhibited clinical correlation and an excellent agreement with commercial immunoassay used in parallel. Conclusion We were able to develop a rapid, sensitive, and cost-effective LC-MS/MS method suitable for therapeutic drug monitoring of MTX in routine clinical diagnostic laboratories.
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Affiliation(s)
- Naresh Kumar Tripathy
- Department of Haematology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Shravan Kumar Mishra
- Department of Pathology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Gopi Nathan
- Department of Haematology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Shreya Srivastava
- Department of Pathology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Anshul Gupta
- Department of Haematology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Raghavendra Lingaiah
- Department of Pathology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
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Abstract
In general, innovation governance models, which deal with organizational structure, innovation process, strategy and leadership, are becoming increasingly important for innovative companies for effective innovation management. Moreover, responsible innovation (RI) as a topic among academic scholars and policy makers is gaining importance, in order to address some of the ethical concerns and dilemmas as issues of governance in general and with special reference to technological innovations. This article attempts to show that technological innovation processes require a circular RI process instead of a linear one with embedded ethical decision-making framework for ethical innovation governance.
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Affiliation(s)
- G. Nathan
- School of Business, Institute of Management, University of Applied Sciences and Arts Northwestern Switzerland (FHNW), Bahnhofstrasse 6, 5210 Windisch, Switzerland
- Business School Lausanne (BSL), Route de la Maladière 21, 1022 Chavannes, Switzerland
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Casady RJ, Nathan G, Sirken MG. Alternative dual system network estimators. Int Stat Rev 2002; 53:183-97. [PMID: 12179595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
"When there are two or more data systems and none of them enumerates the population at an acceptable completeness level, concern about the bias due to underenumeration suggests an estimator which makes joint use of data compiled by the combined imperfect data systems. Conventional dual system estimators are based on the existence of two separate data collection systems. Dual system network estimators assume a main survey and a follow-up quality check survey. The main survey adopts a multiplicity counting rule that combines two mutually exclusive partial counting rules." Three dual system network estimators are presented. "One was previously proposed by Sirken (1979) and is the natural analogue of the conventional dual system estimator. The two other estimators are proposed as potential improvements, although neither of them is the natural analogue of the conventional dual system estimator. The design effects of the three estimators are compared analytically and empirically with one another, and with those of the single system conventional and network estimators." (summary in FRE)
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Saks NP, Hartigan P, Howard N, Schneider JM, Nathan G, Fidler C, Beck CH. Collaboration to implement smoking cessation guidelines during the childbirth continuum. Jt Comm J Qual Improv 2001; 27:664-72. [PMID: 11765383 DOI: 10.1016/s1070-3241(01)27056-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
BACKGROUND Smoking during pregnancy has been linked with such negative outcomes as increased risk for spontaneous abortions, low birth weight, and perinatal and neonatal mortality. In spring 1998 three leading health care systems in San Diego initiated the Trilateral Partnership ("the Partnership"), whose mission is to improve the health and well-being of children. The Partnership chose tobacco control in pregnant women and their families as its first initiative. PROGRAM COMPONENTS-YEAR ONE (1999): Three interventions were developed: intervention by the prenatal care provider, initiation of a referral process to telephone counseling for pregnant women, and intervention for women reporting spontaneously quitting smoking. To date, 83% of the more-than 20,000 women who have been seen in prenatal screening in 28 months counted themselves as nonsmokers. Eleven percent of the women reported they independently stopped smoking once they learned they were pregnant. Six percent reported that they were still smoking. Twenty-three percent of the women reported living in a household with other smokers. PROGRAM COMPONENTS-YEAR TWO (2000): Activity focused on continuing the previous components, hospital intervention for all new mothers at the time of delivery, pediatric intervention at the newborn's visits at 2 and 6 months of age, and development and refinement of a telephone protocol for new parents. ELEMENTS OF SUCCESS The noncontroversial topic of encouraging smoking cessation during pregnancy was one that enhanced immediate buy-in by most individuals contacted to support and engage in the program. Strong commitment and financial support from three health care systems opened doors for the Smoke-Free Families staff and increased the program's visibility in the community.
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Affiliation(s)
- N P Saks
- Women's/Children's Services, Sharp HealthCare, San Diego, USA.
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Julian TB, Patel N, Dusi D, Olson P, Nathan G, Jasnosz K, Isaacs G, Wolmark N. Sentinel lymph node biopsy after neoadjuvant chemotherapy for breast cancer. Am J Surg 2001; 182:407-10. [PMID: 11720681 DOI: 10.1016/s0002-9610(01)00736-x] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
BACKGROUND Sentinel lymph node biopsy (SLNB) is a developing alternative to axillary dissection and may prove to be accurate in the detection of micrometastases in lymph nodes of breast cancer patients. Limited studies exist in the use of SLNB after neoadjuvant therapy. This study was undertaken to determine the accuracy of SLNB after neoadjuvant chemotherapy. METHODS Thirty-one patients with stage I or II breast cancer underwent SLNB after neoadjuvant chemotherapy. RESULTS Lymphatic mapping was performed by radioisotope, blue dye, or both techniques. Sentinel nodes (SN) were identified in 29 patients (93.5%). The SN was positive in 11 patients (38.0%), and was the only positive node in 5 patients (45.5%). There were no false negative SN by hematoxyin and eosin stain or immunohistochemistry (IHC) studies. CONCLUSIONS Sentinel node identification rate is similar to that in nonneoadjuvant studies. The sentinel node accurately predicted metastatic disease in the axilla. IHC studies failed to detect any additional micrometastases. This diagnostic technique may provide treatment guidance for patients after neoadjuvant therapy.
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Affiliation(s)
- T B Julian
- Department of Human Oncology, Allegheny General Hospital, Pittsburgh, PA 15212, USA
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Pereira TC, Landreneau R, Nathan G, Sturgis CD. Pathologic quiz case. Large posterior mediastinal mass in a young woman. Pathologic diagnosis: localized hyaline-vascular-type Castleman disease (angiofollicular lymphoid hyperplasia). Arch Pathol Lab Med 2001. [PMID: 11419989 DOI: 10.1043/0003-9985(2001)125<0964: pqclpm>2.0.co; 2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- T C Pereira
- Department of Pathology, Allegheny General Hospital, Pittsburgh, PA, USA
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Pereira TC, Landreneau R, Nathan G, Sturgis CD. Pathologic quiz case. Large posterior mediastinal mass in a young woman. Pathologic diagnosis: localized hyaline-vascular-type Castleman disease (angiofollicular lymphoid hyperplasia). Arch Pathol Lab Med 2001; 125:964-7. [PMID: 11419989 DOI: 10.5858/2001-125-0964-pqclpm] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- T C Pereira
- Department of Pathology, Allegheny General Hospital, Pittsburgh, PA, USA
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Nathan G. Diagnosing pulmonary embolism in pregnancy--an ongoing debate. Aust Fam Physician 2001; 30:98. [PMID: 11280128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
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Abstract
We report on the fine-needle aspiration (FNA) findings of a low-grade fibromyxoid sarcoma arising from the renal capsule in a 70-yr-old male. Cytologic examination revealed a spindle-cell and myxoid lesion characterized by microtissue fragments of delicate spindle-shaped cells and thin-walled capillary-type channels enmeshed in metachromatically staining myxoid material, best appreciated in Diff-Quik-stained smears. The spindle cells had slightly elongated, bland, oval to tapered nuclei. Based on the FNA diagnosis, the renal mass was resected, which revealed a hypocellular to moderately cellular, spindle-shaped neoplasm showing alternating hypercellular fibrous foci with hypocellular myxoid areas arranged in a swirling growth pattern, characteristic of low-grade fibromyxoid sarcoma. We believe that this is the first report of a low-grade fibromyxoid sarcoma arising in the renal capsule (capsuloma), as well as the first capsuloma diagnosed by FNA biopsy. Differential diagnoses of other sarcomas arising from the kidney and nearby retroperitoneal region are discussed, as well as other entities that might enter into the differential diagnosis of this low-grade sarcoma.
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Affiliation(s)
- J F Silverman
- Department of Pathology and Laboratory Medicine, Allegheny General Hospital, Pittsburgh, Pennsylvania 15212-4772, USA
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Abstract
OBJECTIVE The purpose of this study is to describe the imaging features of tubular adenomas, which are rare benign breast tumors usually found in women younger than 35 years old. CONCLUSION In young women, tubular adenomas can look like noncalcified fibroadenomas on mammography and sonography. In older women, tubular adenomas may resemble malignant masses with microcalcifications. Awareness of these findings may help in assessing concordance between imaging and histologic findings after percutaneous core biopsy of these rare lesions.
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Affiliation(s)
- M S Soo
- Department of Radiology, Duke University Medical Center, Durham, NC 27710, USA
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Terasaka S, Medary MB, Whiting DM, Fukushima T, Espejo EJ, Nathan G. Prolonged survival in a patient with sinonasal teratocarcinosarcoma with cranial extension. Case report. J Neurosurg 1998; 88:753-6. [PMID: 9525723 DOI: 10.3171/jns.1998.88.4.0753] [Citation(s) in RCA: 19] [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: 02/06/2023]
Abstract
Sinonasal teratocarcinosarcoma is a rare malignant neoplasm characterized by the combined histological features of carcinosarcoma and teratoma. The primary symptoms of this tumor are usually nasal obstruction and epistaxis, and a nasal cavity mass is the most common clinical finding. The authors describe an exceptionally rare case in which the patient presented with massive intracranial extension and exhibited confusion as an initial symptom. He subsequently underwent combined radical surgery and radiation therapy and has remained free of disease for 31 months. The surgical approach to the lesion, histological features, and clinical course are detailed.
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Affiliation(s)
- S Terasaka
- Department of Neurosurgery, Allegheny University of the Health Sciences, Pittsburgh, Pennsylvania 15212-4746, USA
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Affiliation(s)
- R H Daffner
- Department of Diagnostic Radiology, Allegheny General Hospital, Pittsburgh, PA 15212-4772
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Abstract
We have presented a case of mesenchymal chondrosarcoma of the sacrum in a 20-year-old woman. We have emphasized that CT and MR are the best imaging modalities for the assessment of the neoplasm and the surgical decision-making process. Histologic study is mandatory for diagnosis of the tumor, with its characteristic dual pattern of chondroid tissue and undifferentiated mesenchymal cells. The rarity of the neoplasm, its deep pelvic location and nonspecific symptomatology led to a late diagnosis and an unfortunate but necessary sacral amputation resulting in bladder and bowel functional sequelae.
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Affiliation(s)
- B D Nguyen
- Department of Diagnostic Radiology, Allegheny General Hospital, Pittsburgh, PA 15212-9986
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Stanko RT, Nathan G, Mendelow H, Adibi SA. Development of hepatic cholestasis and fibrosis in patients with massive loss of intestine supported by prolonged parenteral nutrition. Gastroenterology 1987; 92:197-202. [PMID: 3096806 DOI: 10.1016/0016-5085(87)90859-6] [Citation(s) in RCA: 97] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We studied the effect of 1 yr of parenteral nutrition on liver function tests and, when indicated, liver histology and ultrastructure of 18 patients with no (n = 6), modest (n = 6), and massive (n = 6) loss of intestine. The resection was for Crohn's disease and infarction, respectively. The liver function tests remained normal in all patients with no loss and modest loss of intestine. Four patients with massive loss of intestine, 4-10 mo after initiation of parenteral nutrition, began to develop progressive, marked increases in serum alkaline phosphatase (2-10 times normal), glutamic oxaloacetic transaminase (7-20 times normal), and glutamic pyruvic transaminase (5-14 times normal) activity levels, and bilirubin concentration (5-22 times normal). Light microscopic examination of liver showed cholestasis, bile ductular proliferation, periportal inflammation, fibrosis, and mild steatosis. Electron microscopic examination of liver showed cholestasis with nonspecific organelle changes. None of the patients had any evidence of extrahepatic obstruction. Our data suggest that massive loss of intestine is a contributing factor to hepatic cholestasis and fibrosis in patients maintained on prolonged parenteral nutrition.
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Abstract
Subjects set the extremities of a horizontal rod to appear equidistant from a central reference point, with or without central fixation. On either side, the contrast (salience) of the rod against the background was high or low. Extents to the left were set smaller than those to the right, an effect (LSU) which was stronger with central fixation, indicating that both hemispatial and anatomical pathway factors contribute. Reduced salience on the left increased rather than decreased the LSU, indicating the importance of attentional factors.
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Affiliation(s)
- J L Bradshaw
- Department of Psychology, Monash University, Clayton, Victoria, Australia
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Bradshaw JL, Bradshaw JA, Nathan G, Nettleton NC, Wilson LE. Leftwards error in bisecting the gap between two points: stimulus quality and hand effects. Neuropsychologia 1986; 24:849-55. [PMID: 3808292 DOI: 10.1016/0028-3932(86)90084-9] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Subjects attempted to bisect the gap between two LEDs; these differed from each other in brightness, stimulus duration, onset/offset (a) synchronies, and in continuous or flashing mode of presentation. There was a systematic bias to the left, especially with the left hand, indicating a motor contribution to this perceptual task. A brief, faint or flashing LED attracted the subjective midpoint, perhaps because of increased processing demands; indeed the general leftwards bias was attributed to a greater visuospatial processing capacity in the right hemisphere. Leftwards bias was rather greater when central fixation was maintained, indicating that hemispatial mechanisms may be more important than anatomical connectivities. The technique may be useful for understanding and treating unilateral neglect.
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Bradshaw JL, Nettleton NC, Nathan G, Wilson L. Tactual-kinesthetic matching of horizontal extents by the long-term blind: absence or reversal of normal left-side underestimation. Neuropsychologia 1986; 24:261-4. [PMID: 3714030 DOI: 10.1016/0028-3932(86)90058-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Ten adults, who were blind from infancy or childhood, laterally slid a horizontal rod within a short length of pipe located at the body midline, until the rod extremities were tactually-kinesthetically judged to be equidistant from the ends of the pipe. Whereas sighted subjects normally set the left extremity of the rod closer to the midline than the right irrespective of arm posture, crossed or uncrossed, blind subjects, especially those blind from birth showed trends in the opposite direction. The role of vision is discussed with respect to the development and expression of asymmetries relating to the coding of extracorporeal space.
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Bradshaw JL, Nettleton NC, Nathan G, Wilson L. Bisecting rods and lines: effects of horizontal and vertical posture on left-side underestimation by normal subjects. Neuropsychologia 1985; 23:421-5. [PMID: 4022310 DOI: 10.1016/0028-3932(85)90029-6] [Citation(s) in RCA: 108] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
In Experiment I normal subjects performed the classical clinical line-bisection task, and demonstrated a left-side underestimation. In Experiment II subjects maintained fixation upon a central position and adjusted a rod passing through this fixation point so that both extremities were judged equal. The left-side underestimation was very much greater under these conditions, but was considerably reduced when retinal and gravitational coordinates were dissociated by making the subjects lie horizontally on one or other side. Subjects then demonstrated greater left-side and top-half underestimation when lying on the left than on the right side. Gravitational coordinates and the apparent locus of events in extrapersonal space are determinants of perceptual asymmetries at least as important as anatomical connectivities.
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Bradshaw JL, Nettleton NC, Wilson L, Nathan G. A moving video window or a mask yoked to eye movements: experiments on letters, words and biological movement with prolonged hemifield stimulation. Int J Neurosci 1984; 25:81-98. [PMID: 6526594 DOI: 10.3109/00207458408985591] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
We describe the first use of a new technique, which permits prolonged presentation to one or other visual field of complex, realistic, "ecologically valid" stimuli. An infrared eye movement transducer is linked to a visual display such that an electronic mask (of adjustable dimensions) or, alternatively, a "window" can be made to move as consequence of eye movements. The mask can be made to move exactly with the initiating eye movement, or with positive gain, or in the opposite direction (with or without gain), or in both directions simultaneously ("scissoring"). Alternatively, the apparatus can be set to blank the entire display should an eye movement occur with an excursion greater than a preset criterion level. The display itself can be either computer generated or can consist of a pre-recorded video film. We report preliminary findings with this apparatus. When subjects detected a letter target in a three-by-three letter matrix of laterally presented letters, exposure durations from 50 msec to 400 msec showed consistent right visual field (RVF) superiorities. (Nor was there any evidence of left visual-field, LVF, superiorities at very brief exposures as others have claimed.) Equally strong RVF superiorities also appeared when subjects decided whether or not two simultaneously and laterally presented (for 500 msec) words rhymed, the word pairs being phonologically and orthographically similar (DOWN-GOWN), phonologically similar and orthographically distinct (FARE-HAIR), phonologically distinct and orthographically similar (MOWN-DOWN), or both phonologically and orthographically distinct (FORT-GOAT). Finally, Johansson's (1973, 1976) biological movement procedure was adapted for lateral viewing, with unlimited exposure times. However, the predicted LVF superiority did not eventuate, when subjects decided whether moving points of light, attached to the limbs of darkened walkers, were worn by males or females. Further possible applications of this technique are described for normal and clinical subjects.
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Bradshaw JL, Nathan G, Nettleton NC, Pierson JM, Wilson LE. Head and body hemispace to left and right III: Vibrotactile stimulation and sensory and motor components. Perception 1983; 12:651-61. [PMID: 6678410 DOI: 10.1068/p120651] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Response latencies were measured to vibrotactile stimulation delivered to the forefingers of the left or right hands which were positioned ipsilaterally or contralaterally (across the midline) in left or right hemispace. While the two hands did not differ in speed of response, either hand performed better when located in right hemispace (experiment 1). This effect was greatly reduced, though not eliminated, with 90 degrees lateral head turn, when performance was better with stimulation and responding in right-of-head hemispace, but not right-of-body hemispace (experiment 2). When different hands received stimulation and initiated responses, and were located in either the same or opposite hemispace, right-hemispace superiority was found to be motor rather than sensory (experiment 3). These findings are discussed in the context of the true and the phenomenological midline and the clinical syndrome of hemineglect.
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Ruben FL, Hines SL, Williams SL, Nathan G, Mendelow H. Loiasis in an American naturalist. Am J Trop Med Hyg 1983; 32:738-40. [PMID: 6576646 DOI: 10.4269/ajtmh.1983.32.738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
In March 1981, a 32-year-old male naturalist involved with collecting mammals for study was found to have an unexpected eosinophilia. Serum parasitic screening done at the Centers for Disease Control showed filarial titer by indirect hemagglutination of 1:1,024 and of 1:40 by bentonite flocculation. His travel history disclosed 3 months spent in Cameroon in 1978. He also gave a history of intermittent arm swelling for at least a year. Peripheral blood, collected repeatedly at mid-day and midnight and tested for microfilariae by the Knott technique, was negative. He was begun empirically on diethylcarbamazine, and on day 11 of treatment he removed a worm, identified as a male Loa loa, from his leg. He completed treatment without difficulty and has done well.
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Bradshaw JL, Nettleton NC, Nathan G, Wilson L. Head and body space to left and right, front and rear--II. Visuotactual and kinesthetic studies and left-side underestimation. Neuropsychologia 1983; 21:475-86. [PMID: 6646400 DOI: 10.1016/0028-3932(83)90004-0] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
We report seven experiments involving unimanual or bimanual tactual or visuotactual judgments with horizontally or vertically disposed rods, performed in left or right hemispace, in the context of Bowers and Heilman's (Neuropsychologia 18, 491-498, 1980) hemispace hypothesis. We were only able to weakly confirm their finding of a left hemispace superiority, though either hand was more accurate when in its own hemispace. However, their observation of a left pseudoneglect phenomenon was supported and extended: we found that the left hand underestimates relative to the right, and that there may be left hemispace underestimation which is lost with 90 degree head turns, when horizontal extents are underestimated in the direction of the head turn.
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Marquand J, Guivarc'h M, Garat P, Nathan G, Roullet-Audy JC, Lemaitre F, Mouchet A. [The place of Hartmann's operation in the treatment of complicated lesions of the descending colon. 58 Hartmann resections including 43 as an emergency (author's transl)]. J Chir (Paris) 1979; 116:161-6. [PMID: 489677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Nathan G, Schmelz UO, Kenvin J. Multiplicity study of marriages and births in Israel. Vital Health Stat 2 1977:i-vi, 1-64. [PMID: 303407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Morgan JP, Nathan G, Rivera-Calimlim L, Trabert N. Imipramine-caused interference with levodopa absorption from the gastrointestinal tract in rats. J Pharmacol Exp Ther 1975; 192:451-7. [PMID: 1117428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Rats treated for 3 or 30 days with imipramine (30 mg/kg) have impaired absorption of a single dose of 14C-levodopa. Treated animals retain larger amounts of radioactivity in their gastric lumen and this interfers with delivery of levodopa to intestinal absorptive sites. Tissues of treated animals have lower levels of radioactivity than controls and urinary excretion of radioactivity is also lessened. Imipramine does not interfere with uptake of levodopa by everted sacs of rat jejunum. Imipramine does, however, interfere with the transit of radioactivity through the gastrointestinal tract of rats, since treated animals have lower ileal radioactivity than controls. Lower relative concentration of levodopa metabolites in gastric fluid and tissue may reflect an interference of uptake of levodopa by gastric enterochromaffin-like cells.
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Mouchet A, Guivarc'h M, Nathan G, Picard J, Vital J. [Cystic retroperitoneal lymphangioma with chylous content opacified by lymphangiography. Apropos of a case]. Chirurgie 1975; 101:68-73. [PMID: 1212896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Kohlmann G, Nathan G, Largier A, Jacob M, Terquem J, Veyrieres M, Flabeau F. [Gastrectomy in the treatment of gastroduodenal ulcers. Current status considering their operative mortality and immediate severity]. Ann Chir 1974; 28:35-41. [PMID: 4820220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Guivarc'h M, Nathan G, Mouchet A, Saglier G. [A case of primary malignant melanoma of the rectal ampula]. Arch Fr Mal App Dig 1973; 62:613-24. [PMID: 4802038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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29
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Guivarc'h M, Nathan G, Mouchet A. [Villous tumors of the colon and rectum. Symptoms, diagnosis, and treatment]. Rev Prat 1973; 23:2315-6. [PMID: 4732758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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30
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Guivarc'h M, Nathan G. [Isolated polyps of the large intestine in adults]. Rev Prat 1973; 23:2255-6 passim. [PMID: 4732755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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31
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Nathan G. Approximate tests of independence in contingency tables from complex stratified cluster samples. Vital Health Stat 2 1973:1-14. [PMID: 4540945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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32
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Mouchet A, Marquand J, Guivarc'h M, Nathan G. [Statistical study (500 cases of ano-rectal cancers). Therapeutic indications. Long-term results]. J Chir (Paris) 1972; 104:237-64. [PMID: 4350346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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