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Davidson S. Building nursing competencies for quality nursing practice. THE OREGON NURSE 2000; 65:3. [PMID: 12024569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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152
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Luehrsen KR, Davidson S, Lee YJ, Rouhani R, Soleimani A, Raich T, Cain CA, Collarini EJ, Yamanishi DT, Pearson J, Magee K, Madlansacay MR, Bodepudi V, Davoudzadeh D, Schueler PA, Mahoney W. High-density hapten labeling and HRP conjugation of oligonucleotides for use as in situ hybridization probes to detect mRNA targets in cells and tissues. J Histochem Cytochem 2000; 48:133-45. [PMID: 10653594 DOI: 10.1177/002215540004800114] [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: 11/16/2022] Open
Abstract
Oligonucleotides that carry a detectable label can be used to probe for mRNA targets in in situ hybridization experiments. Oligonucleotide probes (OPs) have several advantages over cDNA probes and riboprobes. These include the easy synthesis of large quantities of probe, superior penetration of probe into cells and tissues, and the ability to design gene- or allele-specific probes. One significant disadvantage of OPs is poor sensitivity, in part due to the constraints of adding and subsequently detecting multiple labels per oligonucleotide. In this study, we compared OPs labeled with multiple detectable haptens (such as biotin, digoxigenin, or fluorescein) to those directly conjugated with horseradish peroxidase (HRP). We used branching phosphoramidites to add from two to 64 haptens per OP and show that in cells, 16-32 haptens per OP give the best detection sensitivity for mRNA targets. OPs were also made by directly conjugating the same oligonucleotide sequences to HRP. In general, the HRP-conjugated OPs were more sensitive than the multihapten versions of the same sequence. Both probe designs work well both on cells and on formaldehyde-fixed, paraffin-embedded tissues. We also show that a cocktail of OPs further increases sensitivity and that OPs can be designed to detect specific members of a gene family. This work demonstrates that multihapten-labeled and HRP-conjugated OPs are sensitive and specific and can make superior in situ hybridization probes for both research and diagnostic applications.
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Davidson S. Supporting nursing's essential values. THE OREGON NURSE 1999; 64:3. [PMID: 12024575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/18/2023]
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154
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Hibbert JM, Davidson S, Hall JS, Jackson AA. Maternal pre-pregnancy weight and placental weight determine birth weight in normal Jamaican infants. W INDIAN MED J 1999; 48:216-20. [PMID: 10639843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
Birth weight is related to neonatal health and long-term risk of chronic disease. Since animal studies have shown that birth outcome is related to placental function, the present project was designed to explore the relationship between birth weight and placental growth and composition with maternal factors during pregnancy among normal term pregnancies in 51 primiparous and 40 multiparous women delivering at the University Hospital of the West Indies. Both groups were followed from 15 weeks of gestation to term. The primiparous group was generally younger than the multiparous (mean age 22 +/- 4 versus 31 +/- 5 yr). They were significantly lighter (55 +/- 8 versus 61 +/- 9 kg) with a lower body mass index (21 +/- 3 versus 23 +/- 4 kg/m2) during early pregnancy, but gained more weight during pregnancy, 11 kg compared with 8 kg, respectively. The duration of pregnancy was similar for both groups. Although the size of the placenta was not significantly different between the two groups, the mean weight of the multiparous placentae was more than that of the primiparous placentae. Also, for all mothers both placental weight and initial maternal weight related directly to birth weight. Placental non collagen protein (NCP), sodium and potassium contents were significantly higher for multiparous women and were related to birth weight. The primiparous group had babies who were significantly lighter, 3.03 kg compared with 3.36 kg, for the multiparous and this could be attributed to differences in placental function and maternal weight. When account was taken of the difference in maternal weight at the start of pregnancy and the difference in placental weight, parity no longer explained any of the differences in birth weight. It is concluded that maternal body weight at the time of becoming pregnant and the early development of the placenta determine the efficiency with which nutrients might be delivered to the foetus and hence foetal growth. The difference in birth weight between primiparous and multiparous women can be explained by the differences in maternal weight at the time of becoming pregnant.
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Michie C, Tulloch R, Davidson S, Hunter B, Chadwick B, Hunter L, Treasure E, Chestnutt I, Goodger N, Sheppard P, Marshall K, Pretty I, Brinton L, Maunder K, Harrison J. Br Dent J 1999; 187:179-180. [DOI: 10.1038/sj.bdj.4800235a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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156
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Michie CA, Tulloch R, Davidson S. Recurrent Kawasaki disease. Br Dent J 1999; 187:179. [PMID: 10513106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
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157
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Davidson S. Thinking in the future tense. HEALTH FORUM JOURNAL 1999; 42:39-40. [PMID: 10539021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
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158
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Abstract
OBJECTIVES To describe the most severe disruptive vocalizers in nursing facilities, in regard to their clinical and behavioral characteristics, staff responses, and treatments used, and to report on their prognosis over 6 months. DESIGN A longitudinal cohort study. SETTING One hundred seven skilled nursing facilities. PARTICIPANTS The 203 residents who were among the two most disruptive vocalizers in their respective facilities and who vocalized at least 2 hours a day. MEASUREMENTS Telephone interviews of licensed nursing staff who cared for the subjects, conducted at baseline, 2, 4, and 6 months. Data gathered included subject demographics, physical function, diagnoses, medication and restraint use, behavioral problems, vocalization characteristics, treatments used, and status at follow-up. RESULTS Subjects tended to have dementia, to be dependent in most activities of daily living, to have multiple medical problems, to be physically restrained (48%), and to be taking psychotropic medication (76%). Nearly all (95%) were audible at least 50 feet away, with loudness associated with more severe cognitive impairment (OR 4.90, P = .001). When subjects who primarily made nonverbal noises ("screamers") were compared with those whose predominant expressions were words ("talkers"), hearing impairment, severe cognitive impairment, and greater dependency in activities of daily living characterized the screamers. Staff reported trying a variety of treatments with all subjects, often with little success. Two months after enrollment, 66% of surviving subjects vocalized fewer hours than at baseline, and 45% were rated as improved. Independent predictors of improvement included greater ADL independence, hearing and vision problems, shorter length of stay, urinary incontinence, and use of a treatment other than one-on-one interventions. Nearly one-quarter of subjects (23.4%) died within 6 months. Baseline factors associated independently with a higher probability of death included age, use of activity intervention, physical abusiveness, and absence of wandering. CONCLUSION Severe disruptive vocalization is associated with severe cognitive and physical impairment and with a high probability of mortality within 6 months. Subcategorization of severe vocalizers by vocalization type or other associated factors may be useful for prognostic and treatment purposes.
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Jakobsson I, Heidvall M, Davidson S. The sevoflurane-sparing effect of nitrous oxide: a clinical study. Acta Anaesthesiol Scand 1999; 43:411-4. [PMID: 10225074 DOI: 10.1034/j.1399-6576.1999.430408.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND We studied the sevoflurane-sparing effect of nitrous oxide in a prospective randomised study. METHODS Forty-two ASA I-II patients scheduled for elective knee arthroscopy under general anaesthesia were randomly assigned to a fresh gas flow consisting of oxygen in air or oxygen in nitrous oxide 1:2. All patients received a standardised anaesthesia consisting of induction with fentanyl and propofol and maintenance with sevoflurane adjusted according to clinical signs. The sevoflurane consumption was studied by means of weighing the vaporiser before and after every anaesthesia. RESULTS The mean sevoflurane consumption was reduced from 0.62 to 0.25 g/min, a 60% reduction, by the use of oxygen in nitrous oxide 1:2 in the fresh gas flow. The emergence was faster for the patients receiving nitrous oxide. No major differences were observed during recovery. CONCLUSION Nitrous oxide was found to be cost-effective for use during short ambulatory knee arthroscopy.
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Davidson S. Therapeutic breakthroughs in the millennium: what to look for in the next two decades. Part 2: New therapeutics reverse old thinking. HEALTH FORUM JOURNAL 1999; 42:61-3. [PMID: 10538905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
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161
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Otto LK, Davidson S. Radiation exposure of Certified Registered Nurse Anesthetists during ureteroscopic procedures using fluoroscopy. AANA JOURNAL 1999; 67:53-8. [PMID: 10488277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
Due to the use of fluoroscopy in the operating room, Certified Registered Nurse Anesthetists (CRNAs) frequently are exposed to the dangers of radiation emitted during surgical procedures using fluoroscopy. The purposes of this research were to determine the level of radiation exposure of the CRNA during fluoroscopic procedures in the operating room and to determine whether these levels are within the limits of maximum permissible dose equivalents published in the Code of Federal Regulations (CFR). This research was conducted in an operating room specifically designated for urological procedures using fluoroscopy. A stationary dosimeter was used to measure radiation exposure. The dosimeter was exchanged monthly for 6 months. Data from this study confirmed that the total radiation exposure was above the limit set by the CFR for whole body radiation exposure, thus exposing the thyroid, which is typically unprotected. The data from this study also supported earlier works that suggested that the radiation to the lens of the eye is of little concern since the exposure rarely exceeds the dose limits set by the CFR.
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Malhotra K, Luehrsen KR, Costello LL, Raich TJ, Sim K, Foltz L, Davidson S, Xu H, Chen A, Yamanishi DT, Lindemann GW, Cain CA, Madlansacay MR, Hashima SM, Pham TL, Mahoney W, Schueler PA. Identification of differentially expressed mRNAs in human fetal liver across gestation. Nucleic Acids Res 1999; 27:839-47. [PMID: 9889281 PMCID: PMC148255 DOI: 10.1093/nar/27.3.839] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Differential gene expression, with its precise start and stop times, is believed to be critical for the programmed development of new cells and tissues. Within the developing fetus, one tissue of particular interest is fetal liver. This organ undergoes rapid changes in the pathway toward liver development in utero since it is also the major site of hematopoiesis, until bone marrow hematopoiesis predominates. Believing that patterns would emerge from the bi-weekly large-scale inspection of expressed genes in the fetal liver, we employed differential display reverse transcription-polymerase chain reaction (DDRT-PCR) as ourprimary inspection tool. Using DDRT-PCR, we isolated cDNAs differentially expressed throughout fetal liver development and in adult liver. We displayed approximately 25 000 cDNAs from 10 and 24 week fetal liver and adult liver. From this initial screen, we determined that approximately 0.1-1% of the mRNA population undergoes expression changes. We extracted, purified and sequenced 25 differentially displayed cDNA bands. Fourteen cDNAs had similarities to known genes, while 11 cDNAs were not similar to any characterized gene. The differentially expressed cDNAs from known genes present in fetal liver include alpha-fetoprotein, stem cell factor, erythroid alpha-spectrin, 2,3-bisphosphoglycerate mutase, insulin-like growth factor-2, porphobilinogen deaminase and Mac30. The differentially expressed cDNAs present in adult liver but not in 10 week fetal liver were nicotinamide deaminase, human fibrinogen-related protein and alpha-acid glycoprotein. The majority of differentially expressed genes found during this effort appear to be turned on during organogenesis, however, some genes were found that are apparently turned off completely.
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Davidson S. Therapeutic breakthroughs in the new millennium: what to look for in the next two decades. Part 1: New answers for cancer, drug resistance, food poisoning. HEALTH FORUM JOURNAL 1999; 42:54-6. [PMID: 10387918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
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164
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Yadav RP, Saxena RK, Gupta R, Davidson S. Lipase production by Aspergillus and Penicillium species. Folia Microbiol (Praha) 1998; 43:373-8. [PMID: 9821291 DOI: 10.1007/bf02818576] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Forty each of aspergilli and penicillia were screened for extracellular lipase production on agar plates and in liquid medium containing olive oil as substrate. Twenty-nine aspergilli and twenty-six penicillia produced lipase. Out of these, 19 aspergilli and 22 penicillia showed activity both on Nile blue sulfate and glycerol tributyrate agar plates while only 10 aspergilli and 4 penicillia showed a positive response to glycerol tributyrate agar alone. The screening revealed 11 Aspergillus spp. and 15 Penicillium spp. as new lipase producers. Pig fat as an economic substrate for lipase production was also investigated.
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165
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Mizrahi J, Katz K, Davidson S, Wielunsky E, Minzly J, Soudry M. Weight-bearing patterns on the knees of preterm infants. Med Eng Phys 1998; 20:625-8. [PMID: 9888242 DOI: 10.1016/s1350-4533(98)00060-5] [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: 11/26/2022]
Abstract
In this study we present a method of monitoring the forces under the knees of preterm infants lying in the prone position. Dual force sensing resistor transducers, connected to optically-isolated amplifiers, were used to monitor the forces. A thermistor airflow sensor was used for the parallel monitoring of the respiratory signal. The measurements were made on ten preterm infants. The average forces were 0.51 and 0.50 N for the left and right knees, respectively. In the frequency domain, the basic harmonic of the force traces was 1.27 Hz approximately, corresponding to the respiratory rhythm. Additional, smaller harmonics, were detected in the force traces at 2.54 and 3.81 Hz. A rather notable power signal could also be seen around 0.1 Hz. The results obtained indicate that the system developed is highly sensitive for providing data on the amplitudes, periods and sequences of oscillations and symmetry of load bearing in preterm infants. Knowledge of the normal and abnormal reaction force patterns may assist in the early diagnosis of abnormal neurodevelopment.
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Parmar VS, Kumar A, Pati HN, Saxena RK, Davidson S, Gupta R. Potential use of a novel lipase from Aspergillus carneus in deacetylation reactions. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1387:325-30. [PMID: 9748644 DOI: 10.1016/s0167-4838(98)00148-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
A novel lipase from Aspergillus carneus has been used in organic solvents for efficient regioselective and chemoselective deacetylation of the peracetates of polyphenolic aromatic ketones, esters and amides. A reversal of regioselectivity was observed as compared with the results obtained during deacetylation with porcine pancreatic lipase (PPL).
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Davidson S. Regeneration as therapy. THE HEALTHCARE FORUM JOURNAL 1998; 41:62-4. [PMID: 10185490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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169
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Albukrek D, Davidson S, Merlob P. [Fluconazole administration during pregnancy]. HAREFUAH 1998; 135:243-6. [PMID: 9885646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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170
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Shefi O, Davidson S, Maayan A, Akselrod S. The effect of thermal stimulation on the heart-rate variability in neonates. Early Hum Dev 1998; 52:49-66. [PMID: 9758248 DOI: 10.1016/s0378-3782(98)00005-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Thermoregulation in humans can be divided into three broad mechanisms of control, namely: shivering, sweating and vasomotor activity. Previous investigations suggested the presence of an autonomic rhythm, originating in the central nervous system, possibly related to thermal vasomotor control and directly affecting heart rate by reflex changes in cardiac sympathetic and parasympathetic activity. The objective of the present work was to study the maturation process of the thermoregulatory system in newborns. We used peripheral thermal entrainment and focused on the reflections of vasomotor control in the heart-rate (HR) power spectrum (PS). The study included three groups of neonates at three different ages: 10 premature infants, 6 full-terms and 7 older infants (4 to 6 months). Thermal stimulation was achieved by placing a hot and cold surface on the subject's right palm alternately at three different rates: replacing the touching surface every 4 s (0.25 Hz), 7 s (0.14 Hz) and 10 s (0.1 Hz). 'Double period' stimulation was defined as the total duration of each period of hot and cold stimulation at the three rates, namely 8 s (0.125 Hz), 14 s (0.07 Hz), 20 s (0.05 Hz). The ECG of every infant was measured and recorded during the various stages of the experiment. The HR power spectrum from 0.02 Hz up to 2.00 Hz was considered, focusing on narrow ranges around the thermal stimulation frequencies. We found that in most subjects, clear peaks arise in the HR PS at the thermal entrainment frequency and its corresponding half frequency ('double period'). In premature infants, the reaction is best in response to the longest (10 s) stimulus (9 out of 10 prematures reacted positively), in group B (full-term infants) the reaction responds best to the 7-s stimulus (6 out of 6 reacted) and in older infants the reaction is slightly better at the 4-s stimulus. Since sympathetic control is slower, this ability to entrain the control system at increasing frequencies, might be related to the gradual maturation of parasympathetic control after birth. The different reaction of the three groups may help to understand the maturation process of the thermoregulation system.
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Maxwell J, Briscoe F, Davidson S, Eisen L, Robbins M, Temin P, Young C. Managed competition in practice: 'value purchasing' by fourteen employers. Health Aff (Millwood) 1998; 17:216-26. [PMID: 9637978 DOI: 10.1377/hlthaff.17.3.216] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Many large U.S. companies have transformed their procurement of health benefits in the 1990s by combining the principles of managed competition with other business tactics to create a business-savvy hybrid of the private sector's own design, often referred to as "value purchasing." Until recently, few policymakers or health care observers believed that large firms would be a force in health system reform. Yet to implement value purchasing, the large companies in this study created new organizational forms, provided employees with financial incentives to select low-cost health plans, and used business tactics such as competitive bidding to negotiate more favorable rates and to improve quality among health plans. The financial results were impressive for the companies studied. In addition, the companies' demands on the health care delivery system are multiplying as the interface between business firms and health care organizations changes. These demands will only increase as the practices we found become more widespread.
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172
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Trimpey M, Davidson S. Nursing care of personality disorders in the medical surgery setting. Nurs Clin North Am 1998; 33:173-86. [PMID: 9478913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
When patients with personality disorders are treated for medical conditions in an acute care setting, nurses are frequently unaware of the diagnosis. Yet the behavior patterns can create problems for both patient and nursing staff. This article will (1) present an overview of personality disorders; (2) examine personality characteristics of patients with borderline and antisocial personality disorders and the difficulties that arise from splitting, impulsiveness, suicide attempts, manipulation, and aggression; and (3) discuss intervention strategies the nurse who encounters a patient exhibiting a personality disorder can use.
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Anderson L, Laing RBS, Mackenzie AR, Davidson S, Smith CC, Douglas JG. Treatment of soft tissue infections and attitudes to outpatient therapy. J Infect 1998. [DOI: 10.1016/s0163-4453(98)80078-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Davidson S. New European clinical trial regulations are "unacceptable" to industry. Nat Biotechnol 1998; 16:127. [PMID: 9487504 DOI: 10.1038/nbt0298-127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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175
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Davidson S, Reina N, Shefi O, Hai-Tov U, Akselrod S. Spectral analysis of heart rate fluctuations and optimum thermal management for low birth weight infants. Med Biol Eng Comput 1997; 35:619-25. [PMID: 9538537 DOI: 10.1007/bf02510969] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Spectral analysis of heart rate variability is studied in 10 healthy growing premature infants to investigate the changes in autonomic balance achieved as a function of changes in skin temperature. Heart rate is obtained from ECG recordings and the power spectrum of beat-to-beat heart rate fluctuations is computed. The infants maintain mean rectal temperature within 36.3-37.2 degrees C, while skin temperature changes. The respiratory rate does not change at the different servocontrol set points. Heart rate is found to increase slightly, but consistently. The low-frequency band (0.02-0.2 Hz), reflecting the interplay of the sympathetic and parasympathetic tone and known to be maximum at the thermoneutral zone, is maximum at 35.5 and 36 degrees C and decreases gradually to a lower level at a servocontrol temperature of 36.5-37 degrees C. The high-frequency band (0.2-2.0 Hz), coinciding with the respiratory peak and reflecting parasympathetic activity, is significantly elevated at 36 degrees C (p < 0.01). The minimum low: high ratio, indicating the minimum sympathetic-parasympathetic balance and possibly reflecting the most comfortable conditions, occurs at 36 degrees C, although the differences are not statistically significant. Servocontrol skin temperature may thus be adapted, and possibly selected at 36 degrees C for growing premature infants in an attempt to achieve thermal comfort and more balanced autonomic activity.
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