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Soliman SM, EL-Houssini OM. HPTLC Method for Determination of R, R-Glycopyrronium Bromide and its Related Impurities. J Chromatogr Sci 2019; 57:799-805. [DOI: 10.1093/chromsci/bmz055] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Revised: 12/12/2018] [Accepted: 06/23/2019] [Indexed: 11/13/2022]
Abstract
Abstract
An innovative high-performance thin layer chromatographic (HPTLC) method was designed, optimized and validated for the quantification of R, R-glycopyrronium bromide (GLY) and its related impurities in drug substance and drug product. Separation was performed on HPTLC plates pre-coated with silica gel 60 F254 by dichloromethane:methanol:formic acid (10:0.5:0.5, v/v/v) as a developing system. GLY and its related impurities namely, glycopyrronium impurity G and glycopyrronium impurity J, were separated giving compact well-resolved spots with significant retardation factor (Rf) values of 0.17 ± 0.02, 0.34 ± 0.02 and 0.69 ± 0.02, respectively. Quantification was done at 220 nm in the ranges of 0.3–10 and 0.2–4.0 μg/spot with limits of detection and quantification of 0.1, 0.3 and 0.05, 0.2 μg/spot for GLY and its related impurities, respectively. Good accuracy was obtained with mean percentage recovery of 99.48 ± 1.36, 100.04 ± 1.32 and 99.61 ± 0.80 and R2 ≥ 0.9968 for GLY and its impurities, consecutively. Validation parameters were presented according to the International Conference on Harmonization. The method was used to investigate impurity profile of GLY in drug substance and drug product and could be applied in routine analysis of the drug. Comparison between the developed method and the reported method revealed no statistical difference.
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Affiliation(s)
- Suzan M Soliman
- National Organization for Drug Control and Research (NODCAR), 51 wezerat El- Zeraa Street St, Agouza PO Box 12553, Giza 35521, Egypt
| | - Ola M EL-Houssini
- National Organization for Drug Control and Research (NODCAR), 51 wezerat El- Zeraa Street St, Agouza PO Box 12553, Giza 35521, Egypt
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Mabrouk MM, Soliman SM, El-Agizy HM, Mansour FR. A UPLC/DAD method for simultaneous determination of empagliflozin and three related substances in spiked human plasma. BMC Chem 2019; 13:83. [PMID: 31384830 PMCID: PMC6661951 DOI: 10.1186/s13065-019-0604-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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: 03/06/2019] [Accepted: 06/29/2019] [Indexed: 12/03/2022] Open
Abstract
A simple, rapid and sensitive ultrahigh performance liquid chromatographic method was developed for the determination of the anti-diabetic drug: empagliflozin (EMPA) and three related substances in spiked human plasma, using dapagliflozin (DAPA) as an internal standard and tetrahydrofuran as a plasma protein precipitating agent. The chromatographic separation was achieved on an Acquity “UPLC® BEH” C18 column (50 mm × 2.1 mm i.d, 1.7 µm particle size), and a mobile phase consisting of aqueous trifluoroacetic acid (0.1%, pH 2.5): acetonitrile (60:40, v/v) at a flow rate of 0.5 mL/min. Upon using the UPLC system, the run time could be reduced to less than 1.2 min, and the solvents consumption decreased to 0.36 mL of acetonitrile per run. The response was linear over a concentration range of 50–700 ng/mL and 40–200 ng/mL (r2 = 0.9994–0.9999) with lower limits of detection and quantification (LOD/LOQ) of 15/50, 11.5/40, 12/40 and 12.5/40 ng/mL for EMPA and the three related substances, respectively. Good accuracy was obtained with mean percentage recoveries ≥ 96.97% for the studied compounds. The method was validated according to the ICH guidelines and was found suitable for routine analysis of EMPA and its related substances in human plasma.
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Affiliation(s)
- Mokhtar M Mabrouk
- 1Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Tanta University, Elgeish Street, Medical Campus, Tanta, 31111 Egypt.,2Pharmaceutical Services Center, Faculty of Pharmacy, Tanta University, Tanta, 31111 Egypt
| | - Suzan M Soliman
- 3National Organization for Drug Control and Research (NODCAR), Giza, 12511 Egypt
| | - Heba M El-Agizy
- 3National Organization for Drug Control and Research (NODCAR), Giza, 12511 Egypt
| | - Fotouh R Mansour
- 1Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Tanta University, Elgeish Street, Medical Campus, Tanta, 31111 Egypt.,2Pharmaceutical Services Center, Faculty of Pharmacy, Tanta University, Tanta, 31111 Egypt
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Mabkhot YN, Al-Showiman SS, Barakat A, Soliman SM, Kheder NA, Alharbi MM, Asayari A, Muhsinah AB, Ullah A, Badshah SL. Computational studies of 2-(4-oxo-3-phenylthiazolidin-2-ylidene)malononitrile. BMC Chem 2019; 13:25. [PMID: 31384774 PMCID: PMC6661733 DOI: 10.1186/s13065-019-0542-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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: 09/30/2017] [Accepted: 02/01/2019] [Indexed: 11/10/2022] Open
Abstract
The molecular structure of the 2-(4-oxo-3-phenylthiazolidin-2-ylidene) malononitrile (3) is calculated using DFT B3LYP/6-311G(d, p) method. The calculated geometric parameters are in good agreement with the experimental data. The NBO calculations were performed to predict the natural atomic charges at the different atomic sites and study the different intramolecular charge transfer (ICT) interactions occurring in the studied system. The BD(2)C17-C19 → BD*(2)C14-C15, LP(2)O2 → BD*(1)N5-C9 and LP(1)N5 → BD*(2)C10-C11 ICT interactions causing stabilization of the system by 23.30, 30.63 and 52.48 kcal/mol, respectively. The two intense electronic transition bands observed experimentally at 249 nm and 296 nm are predicted using the TD-DFT calculations at 237.9 nm (f = 0.1618) and 276.4 nm (f = 0.3408), respectively. These electronic transitions are due to H-3 → L (94%) and H → L (95%) excitations, respectively.
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Affiliation(s)
- Yahia N Mabkhot
- 1Department of Pharmaceutical Chemistry, College of Pharmacy, King Khalid University, Abha, 61441 Saudi Arabia
| | - Salim S Al-Showiman
- 2Department of Chemistry, College of Science, King Saud University, P. O. Box 2455, Riyadh, 11451 Saudi Arabia
| | - A Barakat
- 2Department of Chemistry, College of Science, King Saud University, P. O. Box 2455, Riyadh, 11451 Saudi Arabia.,3Department of Chemistry, Faculty of Science, Alexandria University, P.O Box 426, Ibrahimia Alexandria, 21321 Egypt
| | - S M Soliman
- 3Department of Chemistry, Faculty of Science, Alexandria University, P.O Box 426, Ibrahimia Alexandria, 21321 Egypt.,4Department of Chemistry, Rabigh College of Science and Art, King Abdulaziz University, Jeddah, 21589 Saudi Arabia
| | - Nabila A Kheder
- 5Department of Chemistry, Faculty of Science, Cairo University, Giza, 12613 Egypt
| | - Mohammed M Alharbi
- 2Department of Chemistry, College of Science, King Saud University, P. O. Box 2455, Riyadh, 11451 Saudi Arabia
| | - Abdulrahman Asayari
- 6Department of Pharmacognosy, College of Pharmacy, King Khalid University, Abha, 61441 Saudi Arabia
| | - Abdullatif Bin Muhsinah
- 6Department of Pharmacognosy, College of Pharmacy, King Khalid University, Abha, 61441 Saudi Arabia
| | - Asad Ullah
- 7Department of Chemistry, Islamia College University Peshawar, Peshawar, 25120 KPK Pakistan
| | - Syed Lal Badshah
- 7Department of Chemistry, Islamia College University Peshawar, Peshawar, 25120 KPK Pakistan
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Abdel Razeq SA, Soliman SM, Mohamed AS. Validated stability-indicating high-performance liquid chromatography and thin-layer chromatography methods for the determination of zopiclone in pharmaceutical formulation. JPC-J PLANAR CHROMAT 2018. [DOI: 10.1556/1006.2018.31.4.5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Sawsan A. Abdel Razeq
- Analytical Chemistry Departments, Faculty of Pharmacy, Al-Azhar University, Cairo, Egypt
| | - Suzan M. Soliman
- National Organization for Drug Control and Research (NODCAR), Giza, Egypt
| | - Amal S. Mohamed
- National Organization for Drug Control and Research (NODCAR), Giza, Egypt
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Soliman SM, Abdel Malak NS, El-Gazayerly ON, Abdel Rehim AA. Formulation of microemulsion gel systems for transdermal delivery of celecoxib: In vitro permeation, anti-inflammatory activity and skin irritation tests. Drug Discov Ther 2010; 4:459-471. [PMID: 22491312] [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: 05/31/2023]
Abstract
The aim of this study was to develop suitable microemulsion gel systems for transdermal delivery that could assist dissolution enhancement of poorly water soluble celecoxib and thus improve its skin permeability. Long term oral administration of celecoxib causes serious gastrointestinal adverse effects, which makes it a good candidate for transdermal formulations, yet its low water solubility (4 mg/L) makes this challenging. Ternary phase diagrams were constructed using isopropyl myristate and oleic acid as oils, Tween 80 as surfactant, and Cremophor RH40 as cosurfactant. Microemulsion areas were identified and two systems each of 36 formulas were prepared and assessed for visual inspection, spreadability, pH measurements, and droplet size analysis. Drug release and in vitro permeation of celecoxib from microemulsion formulas through semi-permeable membranes and excised abdominal rabbit skin, respectively, were carried out and compared to celecoxib cream. In all tested formulas, celecoxib was released and permeation was at a higher rate than that from the corresponding cream. The optimized formula (F12) was found to be superior to all other formulas. This formula increased the permeation rate of celecoxib up to 11 times compared to that of the cream. Its stability was retained after one year of storage under ambient conditions and its anti-inflammatory effect was significantly higher than that of celecoxib cream and the oral commercial formula. Skin irritancy and histopathological investigation of rat skin revealed its safety. The results revealed that the developed microemulsion gel has great potential for transdermal delivery of celecoxib.
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Affiliation(s)
- S M Soliman
- Department of Pharmaceutics, Faculty of Pharmacy, Cairo University, Egypt
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Zayed SMAD, Farghaly M, Mahdy F, Soliman SM. Impact of repeated pesticide applications on the binding and release of methyl 14C-monocrotophos and U-ring labelled 14C-carbaryl to soil matrices under field conditions. J Environ Sci Health B 2008; 43:595-604. [PMID: 18803114 DOI: 10.1080/03601230802234666] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The dissipation of (O-methyl-14C) monocrotophos and U-ring labelled 14C-carbaryl was monitored for over two years in absence and presence of other insecticides using in situ soil columns. The dissipation of 14C-monocrotophos from soil treated with methomyl and carbaryl showed a faster rate of downward movement than in a control column tagged with the labelled insecticide alone. The same trend was observed in experiments with 14C-carbaryl that dissipated more readily in soil treated with non-labelled monocrotophos and methomyl. In the presence of other insecticides the percentage of bound residues was generally lower than in control experiments. The bound residues at the top of the column are released at a low rate under conditions prevailing in the field. The overall time required for dissipation of 50% of monocrotophos and carbaryl (t50) as estimated from control experiment was approximately 20 and 24 weeks, respectively. The data indicate that repeated applications of pesticides might enhance the release of 14C-bound residues.
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Affiliation(s)
- S M A D Zayed
- Department of Applied Organic Chemistry, National Research Centre, Dokki, Cairo, Egypt
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Abdellatef HE, Ayad MM, Soliman SM, Youssef NF. Spectrophotometric and spectrodensitometric determination of paracetamol and drotaverine HCl in combination. Spectrochim Acta A Mol Biomol Spectrosc 2007; 66:1147-51. [PMID: 17045518 DOI: 10.1016/j.saa.2006.05.028] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2006] [Revised: 05/26/2006] [Accepted: 05/27/2006] [Indexed: 05/12/2023]
Abstract
Thin-layer chromatography, first derivative, ratio spectra derivative spectrophotometry and Vierordt's method have been developed for the simultaneous determination of paracetamol and drotaverine HCl. TLC densitometric method depends on the difference in Rf values using ethyl acetate:methanol:ammonia (100:1:5 v/v/v) as a mobile phase. The spots of the two drugs were scanned at 249 and 308 nm over concentration ranges of 60-1200 microg/ml and 20-400 microg/ml with mean percentage recovery 100.11%+/-1.91 and 100.15%+/-1.87, respectively. The first derivative spectrophotometric method deals with the measurements at zero-crossing points 259 and 325 nm with mean percentage recovery 99.25%+/-1.08 and 99.45%+/-1.14, respectively. The ratio spectra first derivative technique was used at 246 and 305 nm with mean percentage recovery 99.75%+/-1.93 and 99.08%+/-1.22, respectively. Beer's law for first derivative and ratio spectra derivative methods was obeyed in the concentration range 0.8-12.8 and 0.4-6.4 microg/ml of paracetamol and drotaverine HCl, respectively. Vierordt's method was applied to over come the overlapping of paracetamol and drotaverine HCl in zero-order spectra in concentration range 2-26 and 2-40 microg/ml respectively. The suggested methods were successfully applied for the analysis of the two drugs in laboratory prepared mixtures and their pharmaceutical formulation. The validity of the methods was assessed by applying the standard addition technique. The obtained results were statistically agreed with those obtained by the reported method.
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Affiliation(s)
- Hisham E Abdellatef
- Analytical Chemistry Department, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt.
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Shalaby RY, Fawy M, Soliman SM, Dorgham A. Needlescopic inguinal herniorrhaphy in children - A new simplified technique. J Indian Assoc Pediatr Surg 2005. [DOI: 10.4103/0971-9261.16969] [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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Abstract
OBJECTIVE To evaluate histopathologically the ingrowth of urothelium over a demucosalized gastric flap used for augmentation, as such flaps increase the capacity of the bladder if the urothelium can cover the seromuscular patch. MATERIALS AND METHODS The study included eight male dogs; the urinary bladder was widely divided at its dome anteroposteriorly to receive a seromuscular gastric flap, sutured to the edges of the urinary bladder. Before and 1 month after surgery the changes in bladder capacity and pressure were recorded, and urothelial ingrowth assessed histopathologically. RESULTS Two of the eight dogs died; the increase in mean bladder capacity in the remaining dogs was 20% and the decrease in mean intravesical pressure 34%. Gross pathological examination of the urinary bladder showed good 'take' of the gastric flap by the urinary bladder. Histopathologically, there was good healing of the flap, active ingrowth of urothelium, and no mucosal re-growth. CONCLUSION Bladder augmentation with a demucosalized gastrocystoplasty allows the creation of a large compliant urinary bladder with few complications caused by the incorporation of the enteric or gastric epithelium into the urinary bladder. The stomach has a rich blood supply, allowing the harvesting of a well-vascularized flap, and urothelial ingrowth over this flap in the present study was significant.
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Affiliation(s)
- S Abdel Hay
- Paediatric Urology Unit, Paediatric Surgery Department, Ain Shams University, Cairo, Egipt.
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Taha EA, Soliman SM, Abdellatef HE, Ayad MM. Colorimetric Methods for the Determination of Some Tricyclic Antidepressant Drugs in their Pure and Dosage Forms. Mikrochim Acta 2002. [DOI: 10.1007/s00604-002-0904-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Zayed SM, Farghaly M, Soliman SM, Gotta H, Sorg B, Hecker E. Dietary cancer risk from conditional cancerogens (tumor promoters) in produce of livestock fed on species of spurge (Euphorbiaceae). V. Skin irriitant and tumor-promoting diterpene ester toxins of the tigliane and ingenane type in the herbs Euphorbia nubica and Euphorbia helioscopia contaminating fodder of livestock. J Cancer Res Clin Oncol 2001; 127:40-7. [PMID: 11206270 DOI: 10.1007/s004320000214] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Irritant diterpene ester toxins were isolated from Euphorbia nubica and E. helioscopia, which are contaminants of the green fodder of livestock in Egypt. Fractionations of methanol extracts of aerial parts of both plants were monitored by the irritation unit on the mouse ear. Plant extracts were subjected to multiplicative distribution methods, yielding irritant hydrophilic fractions that were further purified by column chromatography. Final purification of the materials was achieved by TLC (silica gel) followed by HPLC, or by TLC alone. In this way, from E. nubica, five Euphorbia factors (Nu1-Nu5) were isolated and characterized as short-chain polyfunctional diterpene esters of tigliane-type parent alcohols. The two weak irritants Nul and Nu3 were triesters of 4-deoxy(4alpha)phorbol. Nu2 was shown to be a triester of the stereoisomeric tigliane-type parent alcohol 4-deoxyphorbol. Weak irritant Nu4 probably is a positional isomer of Nu2. Nu5 was characterized as a short-chain triester of 4,20-dideoxy-5xi-hydroxyphorbol. From E. helioscopia, six short- to medium-chain polyfunctional diterpene esters of the ingenane type, generally containing unsaturated acids were obtained, i.e., four irritant esters of ingenol (Euphorbia factors H1, H2, H5, and H6) and two esters of 20-deoxyingenol (non-irritant Euphorbia substance HS4, and irritant Euphorbia factor H8). All irritant Euphorbia factors of the tigliane and ingenane diterpene ester type described in this investigation are considered to be more or less active tumor promoters, i.e., conditional (non-genotoxic) cancerogens. The Euphorbia factors assayed exhibited moderate (H1) to low (H8) relative tumor-promoting potency in comparison to the ingenane prototype DTE tumor promoter 3-TI.
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Affiliation(s)
- S M Zayed
- Laboratory of Organic Chemistry, National Research Center, Dokki, Cairo, Egypt
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Farghaly M, Zayed SM, Mahdy F, Soliman SM. Lindane degradation and effects on soil microbial activity. Biomed Environ Sci 1998; 11:218-225. [PMID: 9861480] [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] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The degradation of U-14C-lindane in two Egyptian soils was determined in a three-month laboratory incubation. Lindane mineralization was slow and limited in both soils. Evolution of 14CO2 increased with time but only reached 3.5 to 5.5% of the initial 14C-concentration within 90 days. At that time both soils contained about 88% of the applied radiocarbon; 33% to 37% of the initial dose was unextractable and assumed bound to the soils. The methanol-extractable 14C primarily contained lindane with traces of minor metabolites. Radiorespirometry was used to evaluate the effect of lindane on soil microbial activity. Low concentrations of the insecticide initially supressed 14CO2 evolution from U-14C-glucose and microbial activity was significantly inhibited by 10 mg lindane/kg soil.
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Affiliation(s)
- M Farghaly
- National Research Centre, Dokki, Cairo, Egypt
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Soliman SM. Triple suspension rectopexy for complete rectal prolapse. Ann R Coll Surg Engl 1994; 76:115-6. [PMID: 8154803 PMCID: PMC2502202] [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: 01/29/2023] Open
Abstract
Twenty-eight patients with complete rectal prolapse were treated by a three-level triple suspension abdominal rectopexy with no recurrence and with improvement of rectal function. Rectal suspension was effected by three steel wire slings.
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Affiliation(s)
- S M Soliman
- Department of Surgery, Air Forces Hospital, Abbassia, Cairo, Egypt
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Abstract
Middle latency auditory evoked potentials (MAEP) were recorded in 30 normal subjects and in 19 age-matched patients with temporal lobe lesions. MAEP appeared to be differentially affected by the specific structures involved within the temporal lobe. In the majority of patients with lesions involving the auditory area and/or auditory radiation, Na-Pa amplitude was significantly reduced over the involved hemisphere. No similar reduction in amplitude was noted in subjects with lesions not involving the auditory structures within the temporal lobe. We also observed a shift in a Pa latency over the involved hemisphere in patients with temporal lobe lesions involving the auditory structures. This latency shift was less pronounced than the amplitude reduction. The generators of MAEP in humans are discussed according to these findings and to the available literature. Normal intersubject variability of the conventional amplitude measures, and the occasional myogenic contamination of the response, limits establishing reliable criteria for abnormality that can be applied clinically for the diagnosis of patients with temporal lobe disorders.
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Soliman SM. Anchorage overlapping repair of incisional hernia. J R Coll Surg Edinb 1989; 34:140-2. [PMID: 2810162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Fifty-five incisional hernias at different sites were repaired by fashioning strips of the hernial sac with its entire coverings of collagen scar at one side. The strips are reversed through holes made in the superficial overlapping muscular layer and fixed back to the ipsilateral side. There were no major recurrences over a 2-10-year period except for a minor one at the upper end of a vertical repair. The operation was likewise performed with success in 28 patients with para-umbilical hernias. This triple layer anchorage technique is practically and theoretically sound since recurrences due to sliding of layers of simple overlapping repair with stitches cutting out do not occur.
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Abstract
The thyroid cartilage and thyroid gland forming a lump at the suprasternal notch is a surprising congenital anomaly which I believe has not been previously reported. A case with co-existent low hyoid bone, pharyngo-oesophageal junction and intrathoracic cricoid cartilage with no cervical trachea is presented. Its pathogenesis is suggested and its surgical importance is discussed.
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Affiliation(s)
- S M Soliman
- Department of Surgery, Air Forces Hospital, Cairo, Egypt
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Abstract
Eleven patients were found to have a pattern of bilateral, predominantly low-frequency sensorineural hearing loss and disproportionate speech discrimination scores. These patients were submitted to pure-tone audiometry, Arabic speech audiometry, immittance, auditory brainstem response, middle-latency response, Arabic central auditory tests, EEG and computerised tomographic (CT) scan. Results pointed to a lesion in the central auditory pathway. Two possible etiological factors were considered: infection and epilepsy of the temporal lobe. This disease pattern should raise the audiologist-otologist's index of suspicion necessary for its identification and planning of further investigations. This will help determine the etiology and true nature of the syndrome.
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Affiliation(s)
- S M Soliman
- College of Medicine, Ain Shams University, Otolaryngology Department, Cairo, Egypt
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Soliman SM. Modified supraclavicular approach for upper thoracic sympathectomy. J R Coll Surg Edinb 1984; 29:162-6. [PMID: 6747921] [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: 01/21/2023]
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