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An assessment of heart failure screening tools for an outpatient arrhythmia devices clinicPaul, Lucy Joanne 01 January 2017 (has links)
People living with heart failure (PLHF) should be screened for symptoms at every
healthcare visit since they are 3 times more likely to experience ventricular arrhythmias. This quality improvement project (QIP) compared 3 self-administered HF symptoms questionnaires to determine the best screening tool for a tertiary hospital arrhythmia devices clinic. The instruments included the Minnesota Living with Heart Failure Questionnaire (MLHFQ), the Kansas City Cardiomyopathy Questionnaire (KCCQ), and the Self-Reported Heart Failure Symptoms (SHEFS) questionnaire. For a 30-day period, 76 people were eligible to participate in the QIP, with 55 participants included in the final analysis (72.5% participation). The questionnaires were compared and assessed with the gold standard laboratory test for HF (NT-proBNP) for sensitivity and specificity. For HF, the SHEFS was the most sensitive (83%) compared to the NT-proBNP, but the MLHFQ was most specific (89%). When compared to the MLHFQ as the standard, SHEFS was 71% sensitive, and 73% specific for HF. Similarly, when compared to the KCCQ, the SHEFS was both, 75% specific and sensitive in identifying HF. However, the rate of correlation to a positive or negative NT-proBNP test results was the highest for the SHEFS (87%). All 3 questionnaires were statistically significant in predicting admission to hospital for HF in the past 6 months (p = 0.02 to 0.03). Finally, given the shortest length and simplicity of use, the SHEFS was selected by the stakeholders to be the standard screening tool for the clinic. This project contributes to positive social change by providing the first reported comparison in the literature to implement questionnaires in a clinic to assess symptoms for PLHF attending an arrhythmia devices clinic.
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Predictors Of Metabolic Control In Youth With Type 1 Diabetes: Examining Racial Disparities In The Relationship Between Depressive Symptoms And AdherenceUnknown Date (has links)
Poor metabolic control is a major health concern for children and adolescents with type 1 diabetes, particularly for African American youth. The aims of this study were to test the mediating relationship between two variables consistently related to metabolic control, depressive symptoms and adherence, as well as to attempt to explain racial disparities in metabolic control. The study sample consisted of 53 European American youth and 33 African American youth ages 5 to 20 (M = 13.59, SD = 3.49) with type 1 diabetes. Information on depressive symptoms, adherence, and HbA1c was collected during routine outpatient clinic visits. Significant associations were found between depressive symptoms and metabolic control, depressive symptoms and adherence, and adherence and metabolic control. When included together in a regression model, adherence mediated the relationship between depressive symptoms and metabolic control. This mediation pathway did not significantly differ between African American youth and European American youth; however, African American youth had significantly higher HbA1c levels. These findings indicate the importance of considering depressive symptoms during treatment for type 1 diabetes. This study also supports previous research findings of racial disparities in metabolic control among youth with type 1 diabetes. Future studies should further examine mechanisms by which these racial disparities emerge. / acase@tulane.edu
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The Role of Negative Emotions and Cultural Acceptability in Explaining Somatic Symptoms in Latino and White non-Latino ChildrenJanuary 2013 (has links)
To date, not much is known about why past research has found that Latino youth report higher levels of internalizing symptoms than White non-Latino youth. At a more basic level, our current understanding of phenomenology of internalizing problems in Latino youth is limited. This study explored the relationship among anxiety, depression, and somatic symptoms and investigated the influence of cultural acceptability on somatic symptom expression within a school-based sample (5th through 8th grade) of Latino and White non-Latino youth. Anxiety and depression uniquely explained variability in somatic symptom expression. Contrary to past research, Latino and White non-Latino youth did not report different somatic symptoms levels. Cultural acceptability did not vary by ethnicity. Cultural acceptability also did not predict somatic symptoms. Exploratory analyses were conducted including African-American youth and with male only samples. Cultural acceptability predicted somatic symptoms among the male only samples. Future studies should further explore possible interactions between gender and culture on the expression of psychological distress. / acase@tulane.edu
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Examination of Possible Protective Effect of Rhesus D Positive Blood Factor on Toxoplasma-related Depressive Symptoms in PregnancyParnell, Lisa Lynn 14 November 2014 (has links)
Toxoplasma gondii infects approximately one third of the population worldwide. There is strong evidence that a relationship between T. gondii titer and depressive symptoms exists. There is also evidence suggesting a protective effect of RhD positive blood factor on toxoplasma-induced behavioral and personality changes. This protective effect may influence the relationship between T. gondii and prenatal depressive symptoms. The purpose of this secondary data analysis was to examine the possible protective effect of RhD positive blood factor on prenatal depressive symptoms in 56 pregnant women with T. gondii infection. The cross-sectional design was utilized to answer the question “Does positive RhD blood factor provide a protective effect on prenatal depressive symptoms of patients infected with T. gondii when controlling for ethnicity, race, income, marital status, age and stress?” The conceptual model hypothesized that there was a relationship between socio-demographic variables (age, income, marital status, race, and ethnicity), stress, positive T. gondii titers, RhD positive blood factor, and prenatal depressive symptoms. Pearson correlations and multiple regression were utilized to explore the aims of this study demonstrated in the four statistical models. Significant relationship between stress and positive T.gondii seropositivity on prenatal depressive symptoms was identified. There was no significant relationship identified between RhD positive blood factor on the pregnant women infected with T. gondii which could be attributed to the small sample size.
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Service Utilization among Bereaved Spouses and Family CaregiversBergman, Elizabeth J 11 July 2008 (has links)
For family caregivers, response to the death of the care recipient is marked by a high degree of variability. In recognition of this variability, a range of services and interventions is available to assist individuals in the adjustment to bereavement. The present dissertation, consisting of three related studies, was conducted to examine the utilization of bereavement services by family caregivers.
The first study examined the role of psychological distress in the utilization of bereavement services by spousal caregivers in the Changing Lives of Older Couples (CLOC) study. The second study examined bereavement service utilization among dementia caregiver participants in the Resources for Enhancing Alzheimer's Caregiver Health (REACH) study. Both employed Andersen's Behavioral Model of Health Services Use. The third study examined bereavement service utilization, barriers, and preferences among bereaved spousal caregivers of patients of three hospices in Tampa Bay.
Taken together, results of the current studies point to the importance of family physicians and members of the clergy in the provision of services to bereaved family caregivers and to the prominent role of bereavement outcomes (e.g., depressive symptoms, grief) as need factors in the utilization of bereavement services.
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Birthing and the development of trauma symptoms: Incidence and contributing factorsCreedy, Debra Kay, D.Creedy@mailbox.gu.edu.au January 1999 (has links)
Background: Little is known about the relationship between women's birthing experiences and the development of trauma symptoms. This study aimed to determine the incidence of acute trauma symptoms and posttraumatic stress disorder (PTSD) in women as a result of their labor and delivery experiences, and identify factors that contributed to the women's psychological distress. Method: Using a prospective, longitudinal design, women in their last trimester of pregnancy were recruited from four public hospital antenatal clinics. Four to six weeks postpartum, telephone interviews were conducted with participants (n = 499) and explored the medical and midwifery management of the birth, perceptions of intrapartum care, and the presence of trauma symptoms. Results: One in three women (33%) identified a traumatic birthing event and reported the presence of at least three trauma symptoms. Twenty-eight women (5.6%) met DSM-IV criteria for acute posttraumatic stress disorder. Antenatal variables were not found to contribute to the development of acute or chronic trauma symptoms. The level of obstetric intervention experienced during childbirth (beta = .351, p <.0001) and the perception of inadequate intrapartum care (beta = .319, p <.0001) during labor were consistently associated with the development of acute trauma symptoms. Conclusions: Posttraumatic stress disorder following childbirth is an under-recognized phenomenon. Women who experienced both a high level of obstetric intervention and were dissatisfied with their intrapartum care were more likely to develop trauma symptoms than women who received a high level of obstetric intervention or women who perceived their care to be inadequate. Such findings should prompt a serious review of intrusive obstetric intervention during labor and delivery, and the psychological care provided to birthing women.
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Occupational Exposure to Wood DustAlwis, Kuruppuge Udeni January 1998 (has links)
ABSTRACT Occupational exposure to wood dust and biohazards associated with wood dust (endotoxins, (1->3)-b-D-glucans, Gram (-)ve bacteria and fungi), their correlation to respiratory function, and symptoms among woodworkers have been investigated in the present study. Wood dust, endotoxins, and allergenic fungi are the main hazards found in woodworking environments. Relatively very few studies have been done on wood dust exposure. The present study was designed to comprehensively investigate the health effects of wood dust exposure, and in particular provide new information regarding: Exposure to (1->3)-b-D-glucans in an occupational environment; Levels of exposure to wood dust and biohazards associated with wood dust in different woodworking environments; Correlations among personal exposures, especially correlations between (1->3)-b-D-glucans and fungi exposures, and endotoxins and Gram (-)ve bacteria exposures; Effects of personal exposure to biohazards on lung function; Effects of personal exposure to biohazards on work-related symptoms; and Determinants of inhalable exposures (provide which factors in the environment influence the personal inhalable exposures). Workers at four different woodworking processes; two logging sites, four sawmills, one major woodchipping operation and five joineries situated in the state of New South Wales in Australia were studied for personal exposure to inhalable dust (n=182) and respirable dust (n=81), fungi (n=120), Gram (-)ve bacteria (n=120), inhalable endotoxin (n=160), respirable endotoxin (n=79), inhalable (1->3)-b-D-glucan (n=105), and respirable (1->3)-b-D-glucan (n=62). The workers (n=168) were also tested for lung function. A questionnaire study (n=195) was carried out to determine the prevalence of work-related symptoms. The geometric mean inhalable exposure at logging sites was 0.56 mg/m3 (n=7), sawmills 1.59 mg/m3 (n=93), the woodchipping mill 1.86 mg/m3 (n=9) and joineries 3.68 mg/m3 (n=66). Overall, sixty two percent of the exposures exceeded the current standards. Among joineries, 95% of the hardwood exposures and 35% of the softwood exposures were above the relevant standards. Compared with green mills, the percentage of samples, which exceeded the hardwood standard was high for dry mills (70% in dry mills, 50% in green mills). The respirable dust exposures were high at the joineries compared with the other worksites. Exposure levels to fungi at logging sites and sawmills were in the range 103-104 cfu/m3, woodchipping 103-105 cfu/m3 and joineries 102-104 cfu/m3. The predominant fungi found at sawmills were Penicillium spp. High exposure levels of Aureobasidium pullulans were also found at two sawmills. At the woodchipping mill the predominant species were Aspergillus fumigatus, Penicillium spp., and Paecilomyces spp. The sawmills, which employed kiln drying processes, had lower exposure levels of fungi compared with the green mills. Those workplaces which had efficient dust control systems showed less exposure to fungi and bacteria. Although mean endotoxin levels were lower than the suggested threshold value of 20 ng/m3, some personal exposures at sawmills and joineries exceeded the threshold limit value. The mean inhalable (1->3)-b-D-glucan level at the woodchipping mill was 2.32 ng/m3, at sawmills 1.37 ng/m3, at logging sites 2.02 ng/m3, and at joineries 0.43 ng/m3. For the respirable size fraction, mean endotoxin and mean (1->3)-b-D-glucan concentrations were much lower, being similar to observed dust concentrations. Significant correlations were found between mean inhalable endotoxin and Gram (-)ve bacteria levels (p<0.0001), and mean airborne inhalable (1->3)-b-D-glucan and fungi levels (p=0.0003). The correlations between mean respirable endotoxin levels vs Gram (-)ve bacteria exposure levels (p=0.005), and respirable (1->3)-b-D-glucan exposure levels vs total fungi levels (p=0.005) were also significant. Significant correlations were found between lung function and personal exposures. Multivariate analyses showed that the effect of all the personal exposures on cross-shift decrements in lung function was more prominent among sawmill and chip mill workers compared with joinery workers. Woodworkers had markedly high prevalence of cough, phlegm, chronic bronchitis, frequent headaches, throat and eye irritations, and nasal symptoms compared with controls. Among the woodworkers, smokers had a high prevalence of chronic bronchitis (20%) compared with non-smokers (10%). Some workers also reported a variety of allergy problems due to exposure to various types of wood dust. Both joinery workers and sawmill and chip mill workers revealed significant correlations between work-related symptoms and personal exposures. Chronic bronchitis was significantly correlated with personal exposure to wood dust, endotoxin, (1->3)-b-D-glucan, fungi, and Gram (-)ve bacteria among joinery workers. Whereas among sawmill workers chronic bronchitis was significantly correlated with personal exposure to endotoxin, (1->3)-b-D-glucan, and fungi. Woodworkers showed significant positive correlations between percentage cross-shift change (decrease) in lung function and respiratory symptoms. Significant inverse correlations were also found among percentage predicted lung function and respiratory symptoms. The elevated inhalable dust exposures observed in this study can be explained by a combination of factors, including: lack of awareness of potential health effects of wood dust exposure among both management and workers, aging equipment, inadequate and ineffective dust extraction systems or usually none especially for hand held tools, poor maintenance of the ventilation system in some, non-segregation of dusty processes, dry sweeping, and the use of compressed air jets. The determinant-of-exposure analysis confirmed the field observations. The significant determinants of personal inhalable dust exposures (n=163) were found to be: local exhaust ventilation, job title, use of hand-held tools, cleaning method used, use of compressed air, and green or dry wood processed. Type of wood processed was not found to be statistically significant. A majority of workers (~90%) did not wear appropriate respirators approved for wood dust, while the workers who did wear them, used them on average less than 50% of the time. Workers should be protected by controlling dust at its source. When exposure to wood dust cannot be avoided, engineering controls should be supplemented with the use of appropriate personal protective equipment.
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Effects of premenstrual symptoms on young female singersRyan, Maree Carol January 2006 (has links)
Master of Music / Throughout the 20th Century, female operatic singers in most of the major European opera houses were given “grace days” (where they were not required to sing) in recognition of the effect of hormonal changes on the singing voice. Financial constraints in professional companies have resulted in a reduction of such considerations, but to date, there has been no systematic study of the effects of hormonal fluctuations on the quality of the female singing voice, or of its potential adverse effects on the vocal apparatus for singers who are affected by pre-menstrual syndrome. This study investigated the effects of hormonal fluctuations on young professional female classical singers. Female and male professional singers in training (students) at the Sydney Conservatorium of Music, University of Sydney, were asked to participate as volunteers in the study by keeping daily diaries. The female singers kept a diary for two separate months beginning on the first day of menstruation, in which they recorded their daily basal temperature, mood, voice state and physical well being. The male control subjects kept daily diaries for one month. Acoustic analysis of two vocal samples taken during the second month, on days 1 and 14 of the cycle, were completed on the six most severely affected female subjects, who were identified through their diary ratings of changes in vocal quality during menstruation. The selected students assessed their own vocal samples, presented in random order, to determine whether they could reliably identify which of their samples were affected by menstruation. Vocal staff at the Conservatorium (pedagogues), who were blind to the purpose of the study, also assessed recordings presented randomly. Results indicated that self-perceived vocal quality varied over the course of the menstrual cycle, particularly during the first seven days of the cycle, that negative changes in mood affected the voice, and that fatigue, effort, hoarseness, weakness & peak performance were the most frequently affected vocal states. A surprising finding was that male self-perceived voice quality also varied over the course of one month of diary keeping. There was no consistent change in direction of scores during menstrual and non-menstrual phases. Five of the six most affected singers correctly identified their performance during menstruation but pedagogues were not consistently able to do so.. These results indicate that perceived quality of the voice through changes in the menstrual cycle may not be as obvious to a highly trained observer even though they were reliably perceived by the singer. This study demonstrates that menstruation has a discernible impact on the self-perception of female singers’ vocal quality and implies that the premenstrual or menstrual female may not feel able to present her peak performance at these times of hormonal fluctuation. Further detailed research in this area may be warranted on a larger scale to elaborate a more precise clinical management of the problem.
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The effect of the peripherally acting opioid receptor antgonist, naloxone methiodide, on opioid induced respiratory depression.Lewanowitsch, Tanya January 2004 (has links)
Fatal and non-fatal opioid overdoses resulting from opioid induced respiratory depression are a significant problem throughout the world. Whilst the opioid receptor antagonist, naloxone hydrochloride, can effectively reverse opioid overdoses, its use is limited because of the adverse effects it produces. These include severe withdrawal and the reversal of analgesia produced by opioid receptor agonists. In this project, the peripherally acting opioid receptor antagonist, naloxone methiodide, was investigated for its potential to reverse opioid induced respiratory depression without altering centrally mediated effects, such as withdrawal. In the publications presented in this thesis, naloxone hydrochloride and naloxone methiodide were shown to effectively reverse the decreases in respiratory rate produced by the administration of morphine, methadone and heroin in mice. Naloxone hydrochloride and naloxone methiodide also reversed the analgesia produced by these opioid receptor agonist treatments, but only naloxone hydrochloride induced significant withdrawal. The doses of naloxone methiodide required to produce the effects described above were higher than the naloxone hydrochloride doses required. Radioligand binding techniques indicated that this was due to a difference in the affinity of naloxone hydrochloride and naloxone methiodide for µ, δ and κ opioid receptor binding sites. Radioligand binding techniques were also used to confirm that naloxone methiodide, or its metabolites, could not readily cross the blood brain barrier. Therefore, the effects of naloxone methiodide appear to be mediated outside the central nervous system. The final publication aimed to extend our knowledge of opioid induced respiratory depression by utilising new radiotelemetry technology to test the efficacy of naloxone methiodide in rats subjected to a chronic opioid administration regime. This experiment showed that circadian rhythm plays a role in the development of tolerance to the cardiorespiratory effects of continuous and chronic methadone administration, and that naloxone hydrochloride and naloxone methiodide treatment can increase respiratory rate and heart rate after this methadone administration. Therefore, naloxone methiodide can effectively antagonise the peripheral effects produced by opioid receptor agonists. Peripherally acting opioid receptor antagonists should be developed in the future to prevent or treat the adverse effects of opioid receptor agonists. / Thesis (Ph.D.)--Department of Clinical and Experimental Pharmacology, 2004.
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Factors involved in the regulation of gastrointestinal motility, hormone release, symptoms and energy intake in health and patients with functional dyspepsia.Pilichiewicz, Amelia January 2008 (has links)
This thesis presents studies relating to effects of different macronutrients, predominantly fat and carbohydrate, on gastrointestinal motility, hormone release/suppression, appetite and energy intake in healthy subjects, and on symptom generation in patients with functional dyspepsia. The three broad areas that have been investigated in these studies are: (i) the effect of load, and duration, of small intestinal nutrient exposure on gastric motility, gastrointestinal hormone release/suppression, appetite and energy intake in healthy subjects, (ii) the dietary factors that may contribute to symptom generation in patients with functional dyspepsia, through analysis of diet diaries and acute nutrient challenges, and (iii) the effects of the herbal medication, Iberogast®, on gastric motility in healthy subjects. The ingestion of nutrients, triggers a number of gastrointestinal responses, including the modulation of antropyloroduodenal motility, gastrointestinal hormone release/suppression, and the suppression of appetite and energy intake, resulting in a slowing of gastric emptying to an average rate of 1 - 3 kcal/min, which is required for efficient nutrient digestion and absorption. Additionally, the rate at which glucose enters the small intestine influences postprandial glycaemia and incretin responses. These responses have been demonstrated in animals to be dependent on the length, and region, of the small intestine exposed to fat and glucose, however, this has not been directly investigated in humans. Functional dyspepsia is a clinical condition, characterised by chronic upper abdominal symptoms, such as nausea, bloating and early fullness, without a known cause, which affects approximately 11 - 29 % of the population. Many studies have reported that disturbed gastric motor activity may be the cause of these symptoms, but patients frequently experience symptoms following ingestion of food, and some patients report to eat smaller meals more frequently and avoid fatty and spicy foods. In addition, laboratory-based studies have indicated that functional dyspepsia patients may be hypersensitive to fat, but not carbohydrate. To date, the treatments used to reduce symptoms are frequently directed at the normalisation of gastroduodenal motility, using prokinetics. However, the beneficial effect of these drugs is relatively small and variable, and their adverse effects can be substantial. Herbal drug preparations have recently received considerable interest as an alternative treatment option in functional dyspepsia. A commercially available herbal preparation, Iberogast® which contains nine plant extracts, has been reported to improve upper abdominal symptoms in functional dyspepsia and to decrease fundic tone, increase antral contractility and decrease afferent nerve sensitivity in experimental animals. The effects of Iberogast® in the human gastrointestinal tract have not been investigated. The first three studies presented in this thesis have focused on the effects of delivering fat and glucose into the small intestine at different loads (Chapter 5, 6 and 7), lower, comparable to, and higher than gastric emptying normally occurs, and at different durations of infusion (but still at similar caloric loads - Chapter 5, fat only), on gastrointestinal motility, plasma hormone release/suppression, glycaemia, and energy intake in healthy male subjects. The study in Chapter 5 demonstrated that antral pressure waves and pressure wave sequences were suppressed, and basal pyloric pressure, isolated pyloric pressure waves, and plasma cholecystokinin and peptide YY stimulated, during both the low (1.33 kcal/min for 50 min: 67 kcal/min), and high (4 kcal/min for 50 min: 200 kcal), loads of lipid. The effect of the 4 kcal/min load was sustained so that the suppression of antral pressure waves and pressure wave sequences and increase in peptide YY remained evident after cessation of the infusion. The prolonged lipid infusion (1.33 kcal/min for 150 min: 200 kcal) suppressed antral pressure waves, stimulated cholecystokinin and peptide YY and basal pyloric pressure and tended to stimulate isolated pyloric pressure waves when compared with saline throughout the entire infusion period. These results indicate that both the load, and duration, of small intestinal lipid have an influence on antropyloroduodenal motility and patterns of cholecystokinin and peptide YY release. Chapter 6 demonstrated that lipid loads lower than gastric emptying normally occurs (0.25 kcal/min for 50 min: 12.5 kcal) transiently stimulated isolated pyloric pressure waves and cholecystokinin release and suppressed pressure wave sequences and hunger scores. Loads comparable to (1.5 kcal/min for 50 min: 75 kcal) and higher (4 kcal/min for 50 min: 200 kcal), than the normal rate of gastric emptying, were required to stimulate basal pyloric tone and peptide YY release and suppress antral and duodenal pressure waves. Only the 4 kcal/min load suppressed energy intake. The effects of lipid on all parameters, with the exception of hunger, were load-dependent. In addition, there were relationships between antropyloroduodenal motility and cholecystokinin and peptide YY concentrations with energy/food intake. The study in Chapter 7 demonstrated that loads of glucose lower than (1 kcal/min for 120 min: 120 kcal), comparable to (2 kcal/min for 120 min: 240 kcal) and higher than (4 kcal/min for 120 min: 480 kcal) the rate gastric emptying normally occurs, stimulated blood glucose, plasma insulin, glucagon-like peptide-1, glucose-dependent insulinotropic polypeptide and cholecystokinin concentrations and suppressed the number of antral pressure waves, 2 and 4 kcal/min loads were required for the suppression of duodenal pressure waves and pressure wave sequences and the stimulation of basal pyloric pressure and suppression of energy intake only after the 4 kcal/min loads. There were also relationships between glucagon-like peptide-1 and glucose-dependent insulinotropic peptide with basal pyloric tone, and food/energy intake with pyloric pressures. The studies presented in the subsequent three chapters investigated the contribution of dietary factors on the generation of symptoms in patients with functional dyspepsia when compared with healthy subjects (Chapter 8 and 9) and the effect of Iberogast® on motility in the healthy gastrointestinal tract (Chapter 10). The effects of equi-caloric high-carbohydrate vs. high-fat yoghurt preloads on symptom generation, plasma hormone concentrations, antral area and energy intake were compared between functional dyspepsia patients and healthy subjects (Chapter 8). Nausea and pain were greater in patients after the high-fat, when compared with high-carbohydrate and control, preloads and with healthy subjects. Discomfort was greater after all preloads in patients when compared with healthy subjects. Fasting cholecystokinin and stimulation of cholecystokinin by the high-fat preload were greater in patients, while fasting and postprandial peptide YY were lower in patients than in healthy subjects, with no differences in fasting, or postprandial, plasma ghrelin between patients and healthy subjects. Fasting antral area was greater in patients, with no differences postprandially between patients and healthy subjects. There were no differences in energy intake between the two groups. The relationship between the effect of dietary intake and eating behaviour over a 7-day period on the occurrence and severity of abdominal symptoms was compared between patients and healthy subjects (Chapter 9). The symptoms experienced by the patients included nausea, fullness discomfort, bloating and upper abdominal, and epigastric, pain, of a modest severity, which occurred within 30 min of eating. The number of “meals” ingested was significantly less in functional dyspepsia patients and there was a trend for total energy and fat intake to be less. The occurrence of these symptoms was also statistically related to the ingestion of fat and energy intake. The results of these studies indicate that diet, particularly the ingestion of fat, influences the development of symptoms in a subgroup of patients with functional dyspepsia. The study in Chapter 10 evaluated the effect of the herbal drug Iberogast® on gastric motility in the gastrointestinal tract. Iberogast® increased proximal gastric volume, increased antral pressure waves without affecting pyloric or duodenal pressures, and slightly increased the retention of liquid in the total stomach, but had no effect on gastric emptying of solids or intragastric distribution. These results demonstrate that Iberogast® affects gastric motility in humans, and the stimulation of gastric relaxation and antral motility may contribute to the reported therapeutic efficacy of Iberogast® in functional dyspepsia. The studies reported in this thesis provide new information about the regulation of gastric motility, hormone release/suppression, appetite and energy intake, by varying the loads of lipid and glucose infused into the small intestine in healthy subjects, which may have implications in patients with altered gastric motor functions, such as obese, type-2 diabetes and functional dyspepsia patients. In addition, studies in functional dyspepsia patients revealed that diet, in particular the ingestion of fat, contribute to the cause of their symptoms, and these findings may have important implications for the development of diet-based therapies for the treatment of functional dyspepsia. Furthermore, functional dyspepsia patients with impaired gastric relaxation and antral dysmotility may benefit from the effects of Iberogast® as demonstrated in the healthy gastrointestinal tract. / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1331606 / Thesis (Ph.D.) - University of Adelaide, School of Medicine, 2008
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