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Aslan P, Hall SC, Preminger GM. Images in clinical urology. Suture nidus as a cause for renal nephrolithiasis. Urology 1998; 52:707-8. [PMID: 9763099 DOI: 10.1016/s0090-4295(98)00283-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Rockoff MA, Hall SC. Allocating Subspecialist Pediatric Anesthesiologists. Anesth Analg 1998. [DOI: 10.1213/00000539-199809000-00052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Stevenson GW, Tobin MJ, Horn BJ, Sautel M, Chen EH, Hall SC, Coté CJ. The effect of circuit compliance on delivered ventilation with use of an adult circle system for time cycled volume controlled ventilation using an infant lung model. Paediatr Anaesth 1998; 8:139-44. [PMID: 9549741 DOI: 10.1046/j.1460-9592.1998.00736.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
This in vitro study examined the effect of circuit compliance on delivered ventilation (VE) using a time-cycled, volume controlled circle system in an infant lung model. A Bio-Tek ventilator tester set to simulate normal and abnormal lung compliance measured VE delivered by the Narkomed 2B system. Circle circuits of varied compliance (2.75, 1.22 and 0.73 microliters.cm H2O-1) were tested. Tidal volume was adjusted to peak inflation pressures (PIP) of 20, 30, 40, and 50 cm H2O with three circuits, two lung compliances, and four different size tracheal tubes (TT) (2.5, 3.5, 4, 4.5 mm ID). Data were analysed using the multiple regression technique. Delivered VE was directly related to PIP and lung compliance. Delivered VE was not affected by the choice of circuit. TT size had minimal effects on VE when lung compliance was low; TT size was a more important factor when test lung compliance was normal. Extrapolating this data to the clinical setting, adequate ventilation of infants can be achieved with an adult circle system if an appropriate PIP is chosen, regardless of the compliance of the circuit used. Infants with poor lung compliance may require very high PIP for adequate ventilation.
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Abstract
The effects of omega-conotoxin (CTX) GVIA, omega-agatoxin (Aga) IVA, and the dihydropyridine nicardipine were studied on synaptic transmission in the hippocampus during aging. Field excitatory postsynaptic potentials (fEPSPs) were recorded in the CA1 region in slices from young and aged Fischer 344 rats. Peptide toxins reduced synaptic transmissions similarly in both age groups while nicardipine showed no effect. These results suggests that the well documented age-related changes in synaptic transmissions in the hippocampus cannot be explained by changes in the types of Ca2+ channel mediating synaptic transmission.
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Frush DP, Bisset GS, Hall SC. Pediatric sedation in radiology: the practice of safe sleep. AJR Am J Roentgenol 1996; 167:1381-7. [PMID: 8956563 DOI: 10.2214/ajr.167.6.8956563] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Children will probably always need to be sedated for some radiologic procedures, and controlling the state of consciousness of a child involves more than selecting an agent. The safe and effective sedation process emanates from a carefully designed sedation program. This program begins even before it is determined that sedation is necessary to properly perform a radiologic examination or procedure. Although several issues, controversies, and choices are involved, the context and dialogue of sedation must originate from the principle of protecting the health and safety of children.
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Epstein LB, Smith DM, Matsui NM, Tran HM, Sullivan C, Raineri I, Burlingame AL, Clauser KR, Hall SC, Andrews LE. Identification of cytokine-regulated proteins in normal and malignant cells by the combination of two-dimensional polyacrylamide gel electrophoresis, mass spectrometry, Edman degradation and immunoblotting and approaches to the analysis of their functional roles. Electrophoresis 1996; 17:1655-70. [PMID: 8982598 DOI: 10.1002/elps.1150171103] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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59
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Birmingham PK, Dsida RM, Grayhack JJ, Han J, Wheeler M, Pongracic JA, Coté CJ, Hall SC. Do latex precautions in children with myelodysplasia reduce intraoperative allergic reactions? J Pediatr Orthop 1996; 16:799-802. [PMID: 8906655 DOI: 10.1097/00004694-199611000-00018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Children with myelodysplasia have an increased incidence of latex allergy, which can lead to severe intraoperative allergic reactions. Despite widespread recommendations to avoid intraoperative latex exposure, little evidence exists to support the efficacy of this practice. We examined the incidence of intraoperative allergic reactions in children with myelodysplasia who underwent 1,025 operations in a 36-month period before and after institution of a standardized latex-avoidance protocol. Risk factors for an intraoperative reaction were found to be a history of latex allergy (p = 0.001) and surgery performed before institution of the latex-avoidance protocol (p = 0.01). The estimate of increased risk for allergic reaction was 3.09 times higher in cases performed without latex avoidance. Recognized violation of the protocol after its institution led to severe allergic reactions in three patients. Our experience suggests that a latex-avoidance protocol reduces intraoperative allergic reactions in children with myelodysplasia. Development of severe allergic reactions with violation of the protocol reinforces the importance of vigilance on the part of all operating room personnel in its implementation.
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Przybylo HJ, Stevenson GW, Vicari FA, Horn B, Hall SC. Retrograde fibreoptic intubation in a child with Nager's syndrome. Can J Anaesth 1996; 43:697-9. [PMID: 8807177 DOI: 10.1007/bf03017955] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
PURPOSE The authors describe a retrograde fibreoptic technique for tracheal intubation in a micrognathic child with a tracheo-cutaneous fistula. CLINICAL FEATURES A four-year-old child with Nager's syndrome presented for surgical closure of a tracheocutaneous fistula. A tracheostomy tube had been placed in the neonatal period for management of upper airway obstruction due to severe micrognathia. At 2 1/2 yr of age, after a successful mandibular advancement procedure, the tracheostomy was removed and the child allowed to breathe through the natural airway. Preoperative physical examination revealed an uncooperative child, unable to open her mouth due to limited temporo-mandibular motion. The child was first anaesthetized with ketamine, 70 mg im, then halothane by mask. The authors were unable to open the child's mouth sufficiently to allow rigid laryngoscopy. Attempts at oral and nasal fibreoptic intubation were unsuccessful. Ultimately, the authors were able to intubate nasally by passing an ultrathin Olympus LF-P laryngoscope under direct vision through the tracheocutaneous fistula in a cephalad direction, through the larynx and nasopharynx, then out the nares. An endotracheal tube was then advanced over the fibreoptic scope and positioned distal to the tracheocutaneous fistula. The surgical procedure was successfully accomplished and the trachea was extubated postoperatively without difficulty. CONCLUSION Retrograde fibreoptic intubation may be an option for airway management of a select group of children who cannot be intubated by traditional techniques.
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Przybylo HJ, Stevenson GW, Hall SC. Sodium Nitroprusside Metabolism in Children. Anesth Analg 1996. [DOI: 10.1213/00000539-199606000-00042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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63
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Mill AJ, Wells J, Hall SC, Butler A. Micronucleus induction in human lymphocytes: comparative effects of X rays, alpha particles, beta particles and neutrons and implications for biological dosimetry. Radiat Res 1996; 145:575-85. [PMID: 8619023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The cytokinesis-block micronucleus assay in peripheral blood lymphocytes has the potential for being a simple and rapid method of biological dosimetry. This technique has been used to study the induction of micronuclei in the blood from 12 donors after exposure to a range of radiations with track-averaged LET values ranging from 0.26 to 44 keV microns -1. Data based on the average response of the 12 individuals for 250 kVp X rays were found to agree well with results published previously from other laboratories using similar techniques. Low dose-limiting RBE values relative to 250 kVp X rays for the radiations studied were found to be 0.50 for strontium/yttrium-90 beta particles, 6.9 for 20-23 keV microns -1 alpha particles and 17 for 24 keV neutrons. The pattern of the variation of individual radiosensitivity was found to be complex and dependent on dose, and the evaluation of individual radiosensitivity based on the response at one dose only can be misleading. It is concluded that, although the cytokinesis-block micronucleus assay in blood lymphocytes is a radiobiologically appropriate technique to use for biological dosimetry, its practical implementation may be limited by a need to perform individual pre-exposure calibrations.
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Stevenson GW, Roth AG, Wheeler M, Hall SC. Use of the Olympus LF-P fibreoptic laryngoscope by trainees in paediatric anaesthesia. Anaesthesia 1996; 51:201-2. [PMID: 8779389 DOI: 10.1111/j.1365-2044.1996.tb07721.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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65
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Suresh S, Hall SC. Sedation in pediatric patients. Indian J Pediatr 1996; 63:13-22. [PMID: 10829960 DOI: 10.1007/bf02823860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Sedation is being used increasingly in children to allay anxiety and discomfort. Sedation can also increase the efficiency of performing both diagnostic and therapeutic procedures in children. There are a wide array of available sedation methods that are used by radiologists, gastroenterologists, hematologists/oncologists and emergency room physicians everyday. Indiscriminate use of sedatives has led to seizures, respiratory arrests and death in a variety of practice settings. With improved monitoring capability, more potent drugs and better understanding of the pharmacokinetics in children, it is possible to provide batter care.
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Przybylo HJ, Stevenson GW, Schanbacher P, Backer C, Dsida RM, Hall SC. Sodium Nitroprusside Metabolism in Children During Hypothermic Cardiopulmonary Bypass. Anesth Analg 1995. [DOI: 10.1213/00000539-199511000-00010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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67
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Przybylo HJ, Stevenson GW, Schanbacher P, Backer C, Dsida RM, Hall SC. Sodium nitroprusside metabolism in children during hypothermic cardiopulmonary bypass. Anesth Analg 1995; 81:952-6. [PMID: 7486083 DOI: 10.1097/00000539-199511000-00010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Ten children, aged 1-7 yr, presenting for repair of complex congenital heart lesions, were prospectively studied. A ketamine, halothane/isoflurane, and fentanyl anesthetic was used. After initiation of hypothermic cardiopulmonary bypass, sodium nitroprusside (SNP) was titrated as necessary to maintain a target mean arterial blood pressure of 35-60 mm Hg. Blood samples drawn immediately prior to starting SNP infusion, every 15 min during infusion, and at 1, 4, and 24 h postinfusion were analyzed for whole blood cyanide (CN-) and serum thiocyanate (SCN-). Blood gas analysis was performed every 30 min during SNP infusion. A maximum CN- level > or = 1.0 micrograms/mL was observed in two children; four others had maximum CN- levels between 0.5 micrograms/mL and 1.0 micrograms/mL (normal, < 0.2 micrograms/mL). No child had a clinically important increase of SCN- subsequent to SNP infusion. There was substantial variability in observed CN- accumulation during SNP infusion. CN- levels during the first 60 min correlated with the average SNP rate of administration (P = 0.02). Cyanide levels rapidly decreased after termination of SNP infusion and were undetectable 4 h postinfusion. Despite the short-term increase of CN- level, no child showed biochemical signs of toxicity (acidosis or increased mixed venous oxygen tension).
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Abstract
The PACU is a dynamic environment where children undergo significant physiologic changes. Their safe care is dependent on the concerted, prospective efforts of the medical and nursing staff. This can best be done when the staff is well trained in the care of children and the unit is sufficiently equipped. Attention and leadership from anesthesiologists can ensure ongoing quality care for children.
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69
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Stevenson GW, Horn B, Hall SC. A simple method of blood pressure determination in pediatric patients when automated noninvasive blood pressure measurement fails. J Clin Anesth 1995; 7:549-50. [PMID: 8534477 DOI: 10.1016/0952-8180(95)00061-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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70
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71
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Clauser KR, Hall SC, Smith DM, Webb JW, Andrews LE, Tran HM, Epstein LB, Burlingame AL. Rapid mass spectrometric peptide sequencing and mass matching for characterization of human melanoma proteins isolated by two-dimensional PAGE. Proc Natl Acad Sci U S A 1995; 92:5072-6. [PMID: 7761450 PMCID: PMC41850 DOI: 10.1073/pnas.92.11.5072] [Citation(s) in RCA: 187] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
We report a general mass spectrometric approach for the rapid identification and characterization of proteins isolated by preparative two-dimensional polyacrylamide gel electrophoresis. This method possesses the inherent power to detect and structurally characterize covalent modifications. Absolute sensitivities of matrix-assisted laser desorption ionization and high-energy collision-induced dissociation tandem mass spectrometry are exploited to determine the mass and sequence of subpicomole sample quantities of tryptic peptides. These data permit mass matching and sequence homology searching of computerized peptide mass and protein sequence data bases for known proteins and design of oligonucleotide probes for cloning unknown proteins. We have identified 11 proteins in lysates of human A375 melanoma cells, including: alpha-enolase, cytokeratin, stathmin, protein disulfide isomerase, tropomyosin, Cu/Zn superoxide dismutase, nucleoside diphosphate kinase A, galaptin, and triosephosphate isomerase. We have characterized several posttranslational modifications and chemical modifications that may result from electrophoresis or subsequent sample processing steps. Detection of comigrating and covalently modified proteins illustrates the necessity of peptide sequencing and the advantages of tandem mass spectrometry to reliably and unambiguously establish the identity of each protein. This technology paves the way for studies of cell-type dependent gene expression and studies of large suites of cellular proteins with unprecedented speed and rigor to provide information complementary to the ongoing Human Genome Project.
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72
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Stevenson GW, Tobin M, Hall SC. Fluid Warmer as a Potential Source of Air Bubble Emboli. Anesth Analg 1995. [DOI: 10.1213/00000539-199505000-00044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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73
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Stevenson GW, Bauer B, Hall SC. An easy-to-perform test to help confirm intravascular placement of pediatric intravenous lines. Anesth Analg 1995; 80:1062-3. [PMID: 7726415 DOI: 10.1097/00000539-199505000-00047] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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74
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75
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Stevenson GW, Hall SC. Cardiovascular reactivity among surgeons: not music to everyone's ears. JAMA 1995; 273:1090. [PMID: 7707591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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76
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Tobin MJ, Stevenson GW, Hall SC. A simple, cost-effective method of preventing laryngoscope handle contamination. Anesthesiology 1995; 82:790. [PMID: 7879950 DOI: 10.1097/00000542-199503000-00025] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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77
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Stevenson GW, Tobin M, Hall SC. Bubbles, bubbles, everywhere. Paediatr Anaesth 1995; 5:205-6. [PMID: 7489447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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78
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Roth AG, Wheeler M, Stevenson GW, Hall SC. Comparison of a rigid laryngoscope with the ultrathin fibreoptic laryngoscope for tracheal intubation in infants. Can J Anaesth 1994; 41:1069-73. [PMID: 7828254 DOI: 10.1007/bf03015656] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The flexible ultrathin fibreoptic laryngoscope allows placement of endotracheal tubes as small as 2.5 mm internal diameter. The purpose of this study was to document the safety and efficacy of intubation using an ultrathin fibreoptic laryngoscope. Proved safety and efficacy would justify the routine use of fibreoptic laryngoscopy in normal infants to maintain skills needed for management of the difficult infant airway. In this prospective study, 40 infants < 24 mo of age scheduled for elective surgery were randomly divided into two equal groups. After inhalation induction of anaesthesia, in 20 infants the trachea was intubated using direct rigid laryngoscopy, and in 20 using the ultrathin fibreoptic laryngoscope (size 1.8 mm OD) Olympus LFP. Time to successful intubation was recorded, as well as blood pressure, heart rate, end-tidal CO2 and oxygen saturation. Airway trauma in the operating room, the post-anaesthesia care unit, and on the first postoperative day was recorded. The intubation times using rigid laryngoscopy were less than those using fibreoptic laryngoscopy (13.6 +/- 0.9 sec (mean +/- SEM) vs 22.8 +/- 1.7 sec; P < 0.01). Oxygen saturation and end-tidal CO2 readings were not different between the two groups. After intubation, blood pressure and heart rate increased equally in both groups, returning to normal within one to two minutes. There was no difference in the airway trauma between groups. We conclude that the ultrathin fibreoptic laryngoscope is a safe and effective method for tracheal intubation in infants and may be used routinely in order to maintain fibreoptic airway skills.
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Medzihradszky KF, Maltby DA, Hall SC, Settineri CA, Burlingame AL. Characterization of protein iv-glycosylation by reversed-phase microbore liquid chromatography / electrospray mass spectrometry, complementary mobile phases, and sequential exoglycosidase digestion. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 1994; 5:350-358. [PMID: 24222589 DOI: 10.1016/1044-0305(94)85050-x] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/1993] [Revised: 12/24/1993] [Accepted: 01/05/1994] [Indexed: 06/02/2023]
Abstract
A strategy for the identification of the site occupancy and glycoform heterogeneity, including sialylation occurring at specific sites of N-linked giycoproteins is presented using the asparagine-linked glycosylation on bovine fetuin for illustration. This is achieved by microbore high-performance liquid chromatography/electrospray ionization mass analysis (LC/ESIMS) of the tryptic glycopeptide mixtures with an acetonitrile-based mobile phase followed by sequential steps of residue (and linkage) specific glycoform degradation and LC/ESIMS analysis at each stage. In addition, chromatographic separation of the site-specific glycoforms of tryptic glycopeptides is accomplished by the use of an alternative, mass spectrometrically compatible mobile phase-water/ethanol/propanol/formic acid. By employing this nontraditional mobile phase for characterizing the complete tryptic digest, and using highly specific exoglycosidases in combination with LC/ESIMS analysis, a previously uncharacterized carbohydrate (a disialo biantennary complex oligosaccharide) was identified as a novel structure at Asn(81) of bovine fetuin. (J Am Sot Mass Spectrom 1994, 5, 350-358).
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80
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Tobin M, Stevenson GW, Hall SC. Anesthetic considerations for the pediatric plastic surgical patient. Plast Surg Nurs 1994; 14:71-85. [PMID: 7831407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
An understanding of the anesthesiologist's concerns during pediatric plastic surgical procedures can facilitate the coordination of efforts between the multiple services involved in the care of these children. Prior to surgery, the child's history is obtained and physical examination is performed. The condition of the airway is the primary concern. Preoperative medication is usually given by oral routes to avoid injections. Induction intubation, maintenance, and emergence are discussed. Specific postanesthesia care is described. Special precautions are given for children having surgical repair of craniofacial anomalies. Cleft lip and palate and mandibular advancement are described.
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Badgwell JM, Hall SC, Lockhart C. Revised label regarding use of succinylcholine in children and adolescents. Anesthesiology 1994; 80:243-5. [PMID: 8291725 DOI: 10.1097/00000542-199401000-00047] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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82
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Przybylo HJ, Stevenson GW, Backer C, Luck SR, Webb CL, Morgan E, Hall SC. Anesthetic management of children with intracardiac extension of abdominal tumors. Anesth Analg 1994; 78:172-5. [PMID: 8267158 DOI: 10.1213/00000539-199401000-00030] [Citation(s) in RCA: 80] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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83
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Hall SC, Halford SE. Specificity of DNA recognition in the nucleoprotein complex for site-specific recombination by Tn21 resolvase. Nucleic Acids Res 1993; 21:5712-9. [PMID: 8284219 PMCID: PMC310539 DOI: 10.1093/nar/21.24.5712] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Resolvases from Tn3-like transposons catalyse site-specific recombination at res sites. Each res site has 3 binding sites for resolvase, I, II, and III. The res sites in Tn3 and Tn21 have similar structures at I and II but they differ at III. Mutagenesis of the Tn21 res site showed that sub-site III is essential for recombination though the sequences in III that are recognized by Tn21 resolvase are positioned differently from the equivalent sequences in the Tn3 site. The deletion of III caused a 1,000-fold drop in the rate of recombination. But other mutations at III, changing 3 or 4 consecutive base pairs, caused only 1.5- to 4-fold decreases in rate, even when the mutations were in target sequences for this helix-turn-helix protein. The reason why Tn21 resolvase has similar activities at a number of different DNA sequences may be due to the multiplicity of protein-protein and protein-DNA interactions in its recombinogenic complex. This lack of precision may be a general feature of nucleoprotein complexes.
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Hall SC, Smith DM, Masiarz FR, Soo VW, Tran HM, Epstein LB, Burlingame AL. Mass spectrometric and Edman sequencing of lipocortin I isolated by two-dimensional SDS/PAGE of human melanoma lysates. Proc Natl Acad Sci U S A 1993; 90:1927-31. [PMID: 8446611 PMCID: PMC45993 DOI: 10.1073/pnas.90.5.1927] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
We have integrated preparative two-dimensional polyacrylamide gel electrophoresis with high-performance tandem mass spectrometry and Edman degradation. By using this approach, we have isolated and identified, by partial sequencing, a human melanoma protein (34 kDa, pI 6.4) as lipocortin I. To our knowledge, this protein was not previously known to be associated with melanoma cells. The identity of the protein was confirmed by two-dimensional immunoblot analysis. High-energy collision-induced dissociation analysis revealed the sequence and acetylation of the N-terminal tryptic peptide and an acrylamide-modified cysteine in another tryptic peptide. Thus, knowledge concerning both the primary structure and covalent modifications of proteins isolated from two-dimensional gels can be obtained directly by this approach, which is applicable to a broad range of biological problems.
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85
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Hall SC, Stevenson GW, Suresh S. Burn associated with temperature monitoring during magnetic resonance imaging. Anesthesiology 1992; 76:152. [PMID: 1729926 DOI: 10.1097/00000542-199201000-00031] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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86
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Stevenson GW, Hall SC, Bauer BS, Vicari FA, Seleny FL. Anaesthetic management of Miller's syndrome. Can J Anaesth 1991; 38:1046-9. [PMID: 1752007 DOI: 10.1007/bf03008625] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Miller's syndrome is a rare congenital disorder with facial features similar to that of Treacher-Collins syndrome. This report details the anaesthetic management of an infant during multiple surgical procedures, beginning with pylormyotomy at one month of age. Airway management was difficult because of severe micrognathia and was accomplished using an awake intubation with a conventional straight blade modified for continuous administration of oxygen ("oxyscope"). Due to recurrent upper airway obstruction and the anticipated need for multiple surgical procedures in the first years of life, a tracheostomy was placed. Because of the multiple airway, orthopaedic, and nutritional difficulties, it is important that a prospective, multidisciplinary approach be used in these patients' care. Consideration should be given to early tracheostomy for airway maintenance.
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Hall SC, Ofodile FA. Mandibular fractures in an American inner city: the Harlem Hospital Center experience. J Natl Med Assoc 1991; 83:421-3. [PMID: 1875422 PMCID: PMC2627083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A retrospective study of 116 patients treated at Harlem Hospital for mandibular fractures between 1984 and 1987 was performed. Men comprised 84% of the population studied. The mechanisms of injury were assault with fists and blunt objects (33%), falls (10%), kicking (3%), penetrating injuries (3%), and vehicular accidents (1%). The body of the mandible (46%) and the angle (22%) were the most common fracture sites. Intermaxillary fixation with arch bars was the most frequent method of treatment (55%), followed by open reduction and internal fixation (33%). The complication rate with open reduction was relatively low (15%) despite the fact that 73% of these patients were heavy drug or alcohol abusers with documented poor oral hygiene. This study further substantiates the findings that in the poor inner cities, blunt trauma from drug-related violence has become the major cause of mandibular fracture. Treatment of these patients should include prophylactic broad-spectrum antibiotics, improved oral hygiene, and supplemental nutrition.
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89
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Rudnick S, Stevenson GW, Hall SC, Espinoza-Delgado I, Stevenson HC, Longo DL. Halothane potentiates the antitumor activity of gamma-interferon and mimics calmodulin-blocking agents. Anesthesiology 1991; 74:115-9. [PMID: 1898840 DOI: 10.1097/00000542-199101000-00019] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This study reports effects of halothane on tumor cells in vitro. Cells from the human colon cancer cell line HT-29 were exposed to various concentrations of halothane for 8-72 h. The effect of this exposure on this colon cancer cell line, with and without coincubation with the biologic response modifier gamma-interferon (IFN-gamma), was studied. Using the tumor target cell survival (TTCS) assay, concentrations of halothane from 0.5 to 2% markedly augmented the antitumor activities of IFN-gamma against HT-29. The tumor cell cytostatic effects of IFN-gamma in the 0.75-6-unit/ml range were increased nearly 400% by concentrations of halothane as low as 1%. These results were confirmed in a separate cytolytic assay (Indium-111 release assay), which revealed that halothane concentrations in the 2-4% range markedly increased the cytolytic capacity of IFN-gamma at doses of IFN-gamma between 75 and 1,250 units/ml. The cytolytic activity of IFN-gamma was increased nearly 300% by doses of halothane as low as 1%. A nearly identical pattern of augmentation of IFN-gamma-induced antitumor activity was observed when the known calmodulin inhibitor trifluoperazine (TFP) was coincubated with IFN-gamma. At concentrations of 4-10 microM, the antitumor activity of IFN-gamma was increased nearly 400%. These observations suggest that the pattern of halothane potentiation of the antitumor activity of IFN-gamma is similar to that exhibited by known calmodulin inhibitors.
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90
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Stevenson GW, Schuster J, Kross J, Hall SC. Transoesophageal pacing for perioperative control of neonatal paroxysmal supraventricular tachycardia. Can J Anaesth 1990; 37:672-4. [PMID: 2208540 DOI: 10.1007/bf03006488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The perioperative management of a 16-day-old infant with recurrent supraventricular tachycardia (SVT) is discussed. Vagal manoeuvres and medication were not adequate in controlling the SVT. Since the patient was scheduled for extensive surgery in the prone position, it was decided to use transoesophageal pacing as the method of choice for conversion of SVT. Transoesophageal pacing succeeded several times in overriding the SVT and restoring normal heart rate and haemodynamic variables. The advantages and disadvantages of various methods of treating SVT in the newborn are discussed.
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91
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Stevenson GW, Hall SC, Rudnick S, Seleny FL, Stevenson HC. The effect of anesthetic agents on the human immune response. Anesthesiology 1990; 72:542-52. [PMID: 2178494 DOI: 10.1097/00000542-199003000-00024] [Citation(s) in RCA: 117] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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92
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Hall SC, Stevenson GW. Anesthetic considerations in the pediatric cancer patient. SEMINARS IN SURGICAL ONCOLOGY 1990; 6:148-55. [PMID: 2189195 DOI: 10.1002/ssu.2980060305] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Cancer is second only to trauma as the leading cause of death in children 1-15 years of age. Pediatric cancer patients have unique physiologic, pharmacologic, and psychologic considerations that present a unique challenge to plan anesthesiologist. A thorough understanding of pediatric tumors, along with chemotherapeutics and their complications, is necessary to plan anesthetic management properly. Special attention is directed to the psychologic needs and preparation of both the patient and parents. Close cooperation and coordination among the pediatric oncologist, surgeon, and anesthesiologist are necessary for safe and expeditious operative care.
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93
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Birmingham PK, Stevenson GW, Uejima T, Hall SC. Isolated Postoperative Myoglobinuria in a Pediatric Outpatient A Case Report of Malignant Hyperthermia. Anesth Analg 1989. [DOI: 10.1213/00000539-198912000-00029] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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94
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Birmingham PK, Stevenson GW, Uejima T, Hall SC. Isolated postoperative myoglobinuria in a pediatric outpatient. A case report of malignant hyperthermia. Anesth Analg 1989; 69:846-9. [PMID: 2589665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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95
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Hall SC. The pediatric cancer patient and general anesthesia. JOURNAL OF THE ASSOCIATION OF PEDIATRIC ONCOLOGY NURSES 1984; 1:8-14. [PMID: 6565044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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96
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Levin RM, Zadigian ME, Hall SC. The combined effect of hyperventilation and hypotension on cerebral oxygenation in anaesthetized dogs. CANADIAN ANAESTHETISTS' SOCIETY JOURNAL 1980; 27:264-53. [PMID: 6769568 DOI: 10.1007/bf03007438] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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97
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Hall SC, Ovassapian A. Apnea after intravenous diazepam therapy. JAMA 1977; 238:1052. [PMID: 577948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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98
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Hall SC, Kehoe EL. Case reports. Prolonged survival of Schistosoma japonicum. Calif Med 1970; 113:75-7. [PMID: 5527889 PMCID: PMC1501527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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