151
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Gagnon R, Hunse C, Carmichael L, Fellows F, Patrick J. Fetal heart rate and fetal activity patterns after vibratory acoustic stimulation at thirty to thirty-two weeks' gestational age. Am J Obstet Gynecol 1988; 158:75-9. [PMID: 3337183 DOI: 10.1016/0002-9378(88)90781-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Twenty pregnant women between 30 and 32 weeks' gestational age were studied to examine the effects of a 5-second external vibratory acoustic stimulus on the fetal heart rate, fetal heart rate variability, and fetal activity patterns. There was an immediate significant increase in the basal fetal heart rate for 10 minutes compared with controls. There was also a significant increase in the mean duration of fetal heart rate accelerations without any change in the number of fetal heart rate accelerations. There were no changes in long-term fetal heart rate variability, fetal breathing, and gross fetal body movements.
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152
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Gagnon R, Hunse C, Carmichael L, Fellows F, Patrick J. Human fetal responses to vibratory acoustic stimulation from twenty-six weeks to term. Am J Obstet Gynecol 1987; 157:1375-81. [PMID: 3425645 DOI: 10.1016/s0002-9378(87)80227-2] [Citation(s) in RCA: 78] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Eighty-three healthy pregnant women between 26 and 40 weeks' gestational age were studied to examine effects of a 5-second external vibratory acoustic stimulus on the fetal heart rate, fetal breathing, and gross fetal body movement patterns. There was an immediate fetal heart rate response, following stimulus, characterized by an increase in duration of fetal heart rate accelerations from 26 weeks to term with an increase in basal fetal heart rate after 30 weeks. There was also a delayed response after 33 weeks' gestation, which consisted of an increase in the number of fetal heart rate accelerations and the incidence of gross fetal body movements for up to 1 hour after a 5-second stimulus with the electronic artificial larynx. Term (36 to 40 weeks) fetuses made breathing movements more irregularly after vibratory acoustic stimulation. We suggest that human fetal responses to stimulation with the electronic artificial larynx may reflect a functional maturation of the fetal central nervous system.
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153
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Moutquin JM, Gagnon R, Rainville C, Giroux L, Amyot G, Bilodeau R, Raynauld P. Maternal and neonatal outcome in pregnancies with no risk factors. CMAJ 1987; 137:728-32. [PMID: 3651944 PMCID: PMC1267309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Between November 1979 and April 1984, 790 consecutive pregnant women who considered themselves as having a "normal" pregnancy were followed in private practice from 9 weeks' gestation until 6 weeks post partum. The women had no pre-existing disease or problem classified as a risk to the pregnancy at the time of their first visit, had a singleton pregnancy and gave birth at Notre-Dame Hospital, Montreal. Maternal complications occurred during the course of pregnancy in 181 women (23%). Complications were mostly related to obstetric conditions (10%), such as preterm labour, intrauterine growth retardation (IUGR) and antepartum hemorrhage, or to medical conditions (12%), the most prevalent of which was hypertension (77% of medical conditions). Neonatal complications occurred in 183 infants (23%). The corrected perinatal death rate was 2.5 per 1000. Prematurity, IUGR and dysmaturity/postmaturity accounted for nearly half of the complications. Hyperbilirubinemia occurred in 7% of the cases. Among women without any maternal complications during pregnancy, the frequency rate of neonatal complications was 19%, compared with 23% among the entire group of 790 women. Our results suggest that the absence of maternal complications does not protect the infant from a neonatal complication. Further refinement is needed to identify markers of obstetric, medical and neonatal complications in pregnancies with no risk factors.
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154
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Gagnon R, Campbell K, Hunse C, Patrick J. Patterns of human fetal heart rate accelerations from 26 weeks to term. Am J Obstet Gynecol 1987; 157:743-8. [PMID: 3631176 DOI: 10.1016/s0002-9378(87)80042-x] [Citation(s) in RCA: 68] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Computerized analysis of the distribution of 2598 fetal heart rate accelerations in 83 healthy fetuses at 26 to 40 weeks' gestation demonstrated that the currently used definition of an acceleration as greater than or equal to 15 beats/min for greater than or equal to 15 seconds is applicable only after 30 weeks' gestational age in fetuses with a basal fetal heart rate of less than or equal to 128 beats/min. A significant negative correlation was found between the mean hourly basal fetal heart rate and the mean amplitude of fetal heart rate accelerations from 30 weeks to term. There was also a significant maturational process in the pattern of fetal heart rate and fetal heart rate accelerations that occurred between 26 and 28 and between 30 and 32 weeks; this was characterized by a decrease in basal fetal heart rate, an increase in the amplitude of fetal heart rate accelerations, and an increase in long-term fetal heart rate variability.
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155
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Bugada DC, Gagnon R, Rudin A. Specific refractive index increments of ethylene–vinyl acetate copolymers in trichlorobenzene solutions at 145°C. J Appl Polym Sci 1987. [DOI: 10.1002/app.1987.070340205] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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156
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Gagnon R, Marleau L. Density of states in the quantum-chromodynamic bag model with a nonzero baryon number. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1987; 36:910-915. [PMID: 9958245 DOI: 10.1103/physrevd.36.910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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157
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Abstract
Dialysis patients are at risk for toxicity from formaldehyde used in the reprocessing of dialyzers for reuse; therefore, replacing formaldehyde as a dialyzer sterilant would be advantageous. The potential for RenNew-D as a sterilizing agent was investigated in seven stable in-center hemodialysis patients over 20 consecutive dialyses with cuprammonium cellulose hollow-fiber dialyzers. Treatment with RenNew-D showed no toxicity to patients or dialyzers except for two blood leaks occurring in one patient. The mean number of dialyzer uses was 4.9. In all the dialyzers that passed functional testing small solute clearances were maintained with reuse. The ability of RenNew-D to improve the biocompatibility of reused dialyzers was documented with mean neutrophil counts falling to only 78% of initial values during first reuse of dialyzers processed with RenNew-D compared with a decrease in neutrophil count to 2% of initial values during first use of the same dialyzers. Our results suggest that RenNew-D may be a useful alternative to formaldehyde for the purpose of dialyzer reuse. A reuse procedure that includes processing with RenNew-D is associated with improved biocompatibility, possibly because of maintenance of the blood-derived membrane coating established during prior dialysis.
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158
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Gagnon R, Hunse C, Carmichael L, Fellows F, Patrick J. External vibratory acoustic stimulation near term: fetal heart rate and heart rate variability responses. Am J Obstet Gynecol 1987; 156:323-7. [PMID: 3826167 DOI: 10.1016/0002-9378(87)90276-6] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Twenty-five pregnant women between 36 and 40 weeks' gestational age were studied to examine effects of a 5-second external vibratory acoustic stimulus on the fetal heart rate and fetal heart rate variability. There was an immediate significant increase in the basal heart rate, which persisted for 1 hour after the stimulus, compared to that of the control subjects. There was also a significant increase in the total time during which accelerations occurred for the first 20 minutes after the stimulus. There were no changes in computer-derived indices of fetal heart rate variability. Maternal blood pressure and heart rate were not altered following vibratory acoustic stimulus. We hypothesize that external vibratory acoustic stimulus causes a change from a state of sleep to a state of wakefulness in near term healthy fetuses.
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159
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Gagnon R. [At home alone ... "latchkey children"]. NURSING QUEBEC 1987; 7:30-3. [PMID: 3644205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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160
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Gagnon R, Hunse C, Carmichael L, Fellows F, Patrick J. Effects of vibratory acoustic stimulation on human fetal breathing and gross fetal body movements near term. Am J Obstet Gynecol 1986; 155:1227-30. [PMID: 3789036 DOI: 10.1016/0002-9378(86)90149-3] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Twenty-five pregnant women between 36 and 40 weeks' gestational age were studied to examine effects of a 5-second external vibratory acoustic stimulus on fetal breathing and gross fetal body movement patterns. When the study period was compared with the control period, there was an immediate significant decrease in the incidence of fetal breathing movements that persisted for 1 hour after the stimulus. Moreover the fetal breathing pattern was more irregular for the hour after the stimulus. There was also a significant but delayed increase in the incidence of gross fetal body movements that persisted for 1 hour after the stimulus. We hypothesize that an external vibratory acoustic stimulus causes a change from a state of sleep to a state of wakefulness in near-term healthy fetuses.
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161
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Gagnon R, Patrick J, Foreman J, West R. Stimulation of human fetuses with sound and vibration. Am J Obstet Gynecol 1986; 155:848-51. [PMID: 3766640 DOI: 10.1016/s0002-9378(86)80037-0] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Forty pregnant women between 30 and 42 weeks' gestational age were studied to examine the effects of external sound and vibration on the fetal heart rate. A significant increase in the mean duration and amplitude of the first acceleration after sound stimulus was found when these values were compared with the control values. Conversely the mean time to the first acceleration in the control period was greater than that in the stimulated period. There was a significant increase in the mean duration of fetal heart rate accelerations, the mean amplitude of fetal heart rate accelerations, and the total time spent in accelerations up to 15 minutes after the sound stimulus as compared with the control period. There was no change in the number of accelerations following the sound stimulus compared to control. These data suggest that vibratory acoustic stimuli may influence patterns of fetal heart rate during human pregnancy.
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162
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Dobrowolski JA, Ho FC, Baby L, Boulay R, Drouin B, Gagnon R, Bélanger PA. Use of the inverse synthesis method for the determination of the optical constants of paper in the far infrared. APPLIED OPTICS 1986; 25:2681. [PMID: 18231542 DOI: 10.1364/ao.25.002681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
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163
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Gagnon R, Simard M. Model of heavy-ion collisions in the few-GeV region. PHYSICAL REVIEW. D, PARTICLES AND FIELDS 1986; 33:2592-2596. [PMID: 9956943 DOI: 10.1103/physrevd.33.2592] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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164
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165
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Kaye M, Lella J, Gagnon R, Mulhearn B, Low G. Dialyser reuse: a study in applied medical ethics. CANADIAN MEDICAL ASSOCIATION JOURNAL 1985; 132:335-6. [PMID: 3971249 PMCID: PMC1345818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A dialysis unit's introduction of automated recycling of dialysers is described. The responses of the staff and the patients are outlined, along with the pertinent ethical issues. Suggestions regarding the educational processes necessary with any innovation in long-term medical care are discussed.
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166
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Abstract
It is argued that consent by the patient to reuse dialyzers which have been mechanically cleansed is not required provided adequate standards of practice and safety are utilized. Based on medical benefits, administrative order and cost saving we propose that specific informed consent for such reuse should not be mandatory and that it could at times be unhelpful, both to care givers and recipients.
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167
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Gagnon R. Phase transition and density of states in the quantum-chromodynamic bag model. Int J Clin Exp Med 1983. [DOI: 10.1103/physrevd.28.2862] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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168
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Corman J, Jasmin L, Bayardelle P, Daloze P, Smeesters C, Péloquin A, Gagnon R, Falardeau M. [Diagnosis and treatment of hepatic abscess at Notre Dame Hospital. Study of prognostic factors]. L'UNION MEDICALE DU CANADA 1983; 112:1009-13. [PMID: 6665936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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169
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Gagnon R. Advertising optometry. CANADIAN MEDICAL ASSOCIATION JOURNAL 1982; 126:115-6. [PMID: 7059880 PMCID: PMC1862945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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170
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Rosenthall L, Kloiber R, Gagnon R, Damtew B, Lough L. Frostbite with rhabdomyolsis and renal failure: radionuclide study. AJR Am J Roentgenol 1981; 137:387-90. [PMID: 6455050 DOI: 10.2214/ajr.137.2.387] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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171
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Descamps B, Gagnon R, van der Gaag R, Feuillet MN, Crosnier J. Antibody dependent cell mediated cytotoxicity (ADCC) and complement dependent cytotoxicity (CDC) in 229 sera from human renal allograft recipients. JOURNAL OF CLINICAL & LABORATORY IMMUNOLOGY 1979; 2:303-9. [PMID: 395307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Comparison between CDC and ADCC in a human allogeneic model using the same cytotoxicity marker, i.e. 51Cr release from labelled target cells, provided a better definition of the optimal technical conditions for revealing ADCC. Testing 229 sera from human renal allograft recipients after transplantation, we found that CDC is detected only during rejection (43% of cases) whereas ADCC can be found both in those recipients tolerating their grafts and in those undergoing rejection, more frequently in the former than in the latter (39% vs. 21%, p less than 0.05). These in vivo results and other in vitro experiments support the assumption that two distinct varieties of antibody can mediate the in vitro ADCC phenomenon, some directed against the A, B and C HLA loci and having a deleterious effect on the graft, and others capable of exerting a protective effect and which could be directed against D related HLA determinants.
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172
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Van de Velde JM, Gagnon R. [Synchronous bilateral cancer of the breast histologically different in men]. L'UNION MEDICALE DU CANADA 1977; 106:1005-8. [PMID: 898400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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173
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Descamps B, Gagnon R, van Der Gaag R, Meyer O, Crosnier J. Influence of azathioprine and prednisone in vivo treatment on lymphocyte-dependent antibody-mediated cytotoxicity (LDAC) in 57 human renal allograft recipients. Transplant Proc 1977; 9:981-4. [PMID: 325832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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174
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Lough J, Noonan R, Gagnon R, Kaye M. Effects of fluoride on bone in chronic renal failure. ARCHIVES OF PATHOLOGY 1975; 99:484-7. [PMID: 1164250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Fluoride is concentrated in the bones of patients with chronic renal failure when fluoridated water is used during hemodialysis. Excessive osteoid is produced that is not normally mineralized and severe osteomalacia occurs. Electron microscopical examination of iliac crest bone biopsy specimens from four patients suggests that fluoride induces the synthesis of disarrayed collagen by the activated osteoblasts. Collagen fibers were found to be normal in size and in axial periodicity.
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175
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Lorrain J, Gagnon R. [Preconceptional sex selection]. L'UNION MEDICALE DU CANADA 1975; 104:800-803. [PMID: 1136076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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