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Query: UMLS:C0017168 (gastroesophageal reflux disease)
 11,783 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

We have previously documented anatomic and functional relationships between ventilatory and autonomic neural output. Therefore, we hypothesized in this study that hypoxia-induced changes in respiratory neural output are associated with changes in autonomic regulation of lower esophageal sphincter (LES) pressure. Respiratory neural output, heart rate, and LES pressure were measured before and during a 3-min exposure to 8% oxygen (balance nitrogen) in 12 3- to 7-d-old piglets. Respiratory neural output was determined from diaphragmatic electromyogram and LES pressure from an esophageal catheter. Studies were repeated after atropine administration in eight animals. Hypoxic exposure resulted in significant increases in diaphragmatic amplitude, respiratory rate, and minute diaphragmatic activity as well as heart rate. The biphasic response of diaphragm amplitude peaked at 1 min, whereas the responses of respiratory frequency and heart rate were sustained. Hypoxia caused a 50% increase in LES pressure (p < 0.05), which was eliminated by i.v. atropine administration. Development of apnea during subsequent hyperoxic exposure was always followed by a decline in LES pressure. Hypoxia-induced increase in respiratory neural output and accompanying increase in heart rate are associated with enhanced constrictive output to the LES. Blockade by atropine implicates a peripheral cholinergic mechanism for this LES response. We speculate that whereas hypoxia in the presence of enhanced respiratory neural output seems to be protective against reflux, decreased respiratory drive and accompanying apnea may be associated with a decline in LES tone and predispose to gastroesophageal reflux.
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PMID:Effects of hypoxia on respiratory neural output and lower esophageal sphincter pressure in piglets. 1208 47

Children with severe physical disabilities frequently have respiratory problems which affect their quality of life (QOL). They commonly stem from central nervous system dysfunctions and/or severe motor disabilities, and consist of various impairments deriving primarily from central and motor dysfunctions, such as dysmyotonia, deformation, dysphagia, and gastro-esophageal reflux (GER), which often influence each other and result in respiratory insufficiency without adequate interventions. Aging is also an important factor to worsen respiratory involvements and to change their underlying pathophysiology gradually, even if the primary cause of the disability is non-progressive. A key to effective treatment and improvement of their QOL is to understand the pathophysiology. Evaluation is primarily based on regular physical examination. Other examinations include blood sampling to examine inflammation, nutritional state and blood gas analysis, round-the-clock SpO2 and TcPCO2 or EtCO2 monitoring, chest X ray and computed tomography, polysomnography, laryngoscopy, bronchoscopy, evaluation of swallowing function, and evaluation of GER. Postural control, relaxation, respiratory physiotherapy, and treatment of dysphagia are the most important and common therapeutic procedures. Treatment of GER, treatment of upper airway obstruction, oxygen therapy, tracheostomy, or mechanical ventilation may be needed. It is also important to take into account the possibility that the treatment procedures themselves could affect the patient's QOL. Counseling should be performed before and throughout the treatment process about how patient's and family's everyday life will be influenced positively and negatively by the treatment, and a multidisciplinary team should support all aspects of their needs.
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PMID:[Treatment of respiratory disturbance in children with severe physical disabilities to improve their quality of life]. 1275 51

OBJECTIVE: To verify the association between oxygen desaturation episodes and the dips in pH in infants with chronic obstructive respiratory symptoms. METHOD: Cross-sectional study with children 24 months old or younger hospitalized for investigation of chronic obstructive respiratory symptoms from 1997 to 1999. The patients underwent esophageal pH monitoring associated with transcutaneous oxygen saturation during the night. The patients were included in the study according to their need to be hospitalized and availability of equipment. The indices used to measure this association were reflux index, total number of refluxes, number of refluxes longer than 5 minutes, Euler index, ZMD index, 24-hour mean pH, and mean pH of desaturation. RESULTS: We studied 44 children. The mean age was 7.5 months, and 20% had desaturation below 93% during pH monitoring. We used the t test to compare the occurrence of desaturation with the pH monitoring parameters. We found higher significance with the reflux index (RI), number of episodes longer than 5 minutes, ZMD index, 24-hour mean pH, and mean pH of desaturation. The bivariate analysis, taking into account possible confounding factors and RI, showed PR equal to 6.61 (IC 95% 1.67 - 26.12) for an RI higher than 4%. CONCLUSION: Oxygen saturation monitoring associated with pH monitoring may be a useful tool to establish an association between GER and respiratory problems in patients with chronic or recurrent wheeze.
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PMID:[Association between gastroesophageal reflux and dips in the oxygen transcutaneous saturation of the hemoglobin in infants with chronic obstructive ventilatory disease] 1464 97

OBJECTIVES: To present indications and results of prolonged esophageal pH monitoring in diagnosing pathologic gastroesophageal reflux in newborns during their stay in the neonatal unit. METHODS: This retrospective descriptive-analytical study of 85 prolonged esophageal pH monitoring in neonates was performed, between October 1995 and March 1998, in a tertiary intensive care unity. A Digitrapper MKIII device, pH probes with one or two channels, and antimony electrodes were utilized. The probe was placed 3 cm above the gastroesophageal junction. RESULTS: The main indications of this esophageal pH study were hypoxemia episodes demanding supplemental oxygen, and caffeine resistant apnea. The means -/+ SD of birth-weight and gestational age in the patients evaluated were, respectively, 1,204-/+460 g and 30.5 -/+ 2.9 weeks. There was no statistical difference observed in newborns with and without pathologic gastroesophageal reflux according to clinical manifestations and monitoring conditions. Forty-eight newborns (56.4%) presented 17.6-/+9.1% of the whole examination time with a pH below 4. Of these patients, 31.1% presented birth-weight below 1,000 g. Duodenogastroesophagic was diagnosed in two cases. Of the studied premature with chronic lung disease, 66.7% presented pathologic reflux. CONCLUSION: Prolonged pH esophageal monitoring is helpful in the differential diagnosis of the unspecific and very frequent clinic manifestations in very low birth-weight infants.
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PMID:[Prolonged esophageal pH monitoring utilization in the diagnosis of pathologic reflux in neonates] 1468 24

Dysphagia is a common finding in infants and children with neuromuscular disabilities. Dysphagia may be developmental, as in the preterm infant, transient, chronic, or progressive. The evaluation of dysphagia must take into account the age of the patient and typical development of feeding and swallowing for that age. The typical abilities seen in neonatal, early infancy, later infancy and early childhood periods vary in sensorimotor skills and feeding efficiency. In addition to knowing the substrate of expected skills by age, knowledge of the neurophysiology of feeding and swallowing is essential to diagnosis. Each physiologic phase of deglutition: oral, pharyngeal, and esophageal can present with symptoms of dysphagia that can guide investigation. Common symptoms of dysphagia include generalized feeding difficulty such as poor efficiency, food refusal and failure to thrive. Specific symptoms include tongue thrust, choking, cough, and oxygen desaturation. The possibility of dysphagia can be identified through a thorough feeding history. Examination initially includes the infant's muscle tone and posture in the head, neck and body. Anomalies of structures of the head and neck must be identified and examined for their effect on function. Next, examination of oral structures for reflexes, tongue movements, and symmetry will identify neurologic abnormalities. Observation of feeding is essential and will reveal signs of dysphagia. Aspiration in the infant can present without specific signs. Respiratory abnormalities or Gastroesophageal reflux can be identified during history or examination. Investigation of dysphagia most commonly includes videofluoroscopy, endoscopy, and ultrasonography. The management of dysphagia requires an individualized approach and will include neurologic, respiratory, nutritional and possibly gastrointestinal management. Six broad areas are identified that must be considered in the management of dysphagia in infants and children. They include: normalization of posture and positioning, adaptation of foods and feeding equipment, oromotor therapy, feeding therapy, nutritional support and management of associated disorders. A team of professionals will assist the parent and child in achieving pleasant feedings to foster appropriate growth and development.
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PMID:Investigation and management of dysphagia. 1499 57

Although alteration of airway pH may serve an innate host defense capacity, it also is implicated in the pathophysiology of obstructive airway diseases. Acid-induced asthma appears in association with gastroesophageal reflux after accidental inhalation of acid (fog, pollution, and workplace exposure) and in the presence of altered airway pH homeostasis. Endogenous and exogenous exposures to acids evoke cough, bronchoconstriction, airway hyperreactivity, microvascular leakage, and heightened production of mucous, fluid, and nitric oxide. Abnormal acidity of the airways is reflected in exhaled breath assays. The intimate mechanisms of acid-induced airway obstruction are dependent on activation of capsaicin-sensitive sensory nerves. Protons activate these nerves with the subsequent release of tachykinins (major mediators of this pathway) that, in conjunction with kinins, nitric oxide, oxygen radicals, and proteases, modulate diverse aspects of airway dysfunction and inflammation. The recognition that acid stress might initiate or exacerbate airway obstructive symptomatology has prompted the consideration of new therapies targeting pH homeostasis.
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PMID:Acid stress in the pathology of asthma. 1510 Jun 63

Twelve to twenty-five percent of human population suffer from sleep disorders and sleep-related breathing disorders have a frequency of 5-10%. The association between sleep-related breathing disorders and several diseases, mainly cardiovascular and dysmetabolic, is well known. The aim of this study was to assess the prevalence of this association in a group of 620 patients, aged between 18 and 78 years and referred to the Laboratory of Respiratory Pathophysiology of the Umberto I Hospital of Rome. All patients had a clinical history of a sleep-related breathing disorder and answered a specific questionnaire. One-hundred-and-thirty-seven patients (120 males and 17 females, mean age 64 years), whose questionnaire was suggestive of a sleep-related breathing disorder, underwent clinical assessment including blood tests, lung function tests, blood-gas analysis, ECG and nocturnal polysomnography, either as in- or as out-patients. The main associated pathologies were: arterial hypertension (54.7%), chronic obstructive pulmonary disease (17.9%), obesity (63.1%), dyslipidemia (41%), type 2 diabetes mellitus (6.3%), gastroesophageal reflux (27.3%) and cardiac arrhythmias (4.2%); 95 patients with obstructive sleep apnea syndrome were treated, on the basis of the polysomnography outcomes and according to the Italian Association of Sleep Medicine Guidelines, either with preventive strategies for risk factor reduction, or with medical (positive pressure ventilation, oxygen, assessment of the best drug medication) and/or ear, nose end throat surgical therapies. In most patients, the improvement in the sleep-related breathing disorder was associated with an improvement in their systemic pathology, in particular cardiovascular disease, suggesting the need of a deeper consideration and comprehension of nocturnal apneas.
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PMID:[Relationship between the obstructive sleep apnea syndrome and internal medicine]. 1517 2

The prevalence and clinical consequences of gastro-oesophageal reflux disease (GERD) in chronic obstructive pulmonary disease (COPD) are not well characterised. The present study prospectively studied 42 males with COPD (forced expiratory volume in one second % predicted: 35%, range 20-49) and 16 healthy volunteers of similar age without respiratory or gastro-oesophageal symptoms. The diagnosis of GERD was confirmed using oesophageal 24 h pH monitoring. In the current study group, reflux symptoms were measured using the Vigneri score, cough and dyspnoea with the modified Medical Research Council questionnaire, and pulmonary function with bronchodilator response and health status using St George's Respiratory Questionnaire. Pathological reflux was documented in 26 out of 42 patients (62%) and in three volunteers (19%). In patients with GERD, 15 patients (58%) did not report any reflux symptoms. There were no differences in symptoms, health status, bronchodilator treatment and pulmonary function test between patients with and without GERD. Oxygen desaturation coincided with episodes of increased oesophageal acidity in 40% of patients with GERD. Patients with severe chronic obstructive pulmonary disease have a high prevalence of asymptomatic gastro-oesophageal reflux. The association between this reflux and oxygen desaturation deserves further attention.
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PMID:Increased gastro-oesophageal reflux disease in patients with severe COPD. 1521 95

Oxygen free radicals trigger arachidonic acid peroxidation. The end-products of this reaction are malonyl dialdehyde (MDA) and conjugated dienes (CDs). The pattern of changes of MDA and CD concentrations in serum and esophagus mucosa homogenates were estimated in patients with GERD. The study was conducted on a group of 92 patients. They were divided into a non-esophagitis and co-existent esophagitis subgroup. The presence of inflammation was confirmed by means of pathomorphological examination. Results were verified against upper gastrointestinal tract endoscopy outcomes. The measurements were taken before and 8 weeks after anti-GERD treatment. Results were compared against 20 patients awaiting hernia repair. In both groups MDA serum concentrations before treatment were significantly different from the control group (2.02 nmol/mL in group I and 3.92 nmol/mL in group II). It decreased significantly after treatment in group II (2.72 nmol/mL) and insignificantly in group I. Also DS serum concentrations before treatment was significantly different comparing to the control group (1.34 nmol/mL in group I, and 2.13 nmol/mL in group II). Like MDA, dienes' concentrations decreased significantly after treatment in group II and insignificantly in group I. MDA and DS tissue concentrations were always higher than the serum ones. Both before and after treatment they displayed statistically significant differences between the esophagitis and non-esophagitis groups. Oxygen free radicals measured by means of MDA and DS serum and tissue homogenate concentrations rise significantly in patients with GERD compared to the control group. Arachidonic acid peroxidation products' concentrations were significantly higher in patients with GERD and esophagitis than in the non-esophagitis group.
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PMID:[Effect of arachidonic acid peroxidation products on the development of gastroesophageal reflux disease]. 1551 Aug 90

Pierre Robin sequence is characterized by micro-gnathia, glossoptosis, feeding difficulties, and upper respiratory obstruction, which are frequently complicated by bronchial aspiration and pulmonary infection. Gastroesophageal reflux is also common in these patients. To assess the results of mandibular distraction, a study was performed in 18 patients to detect swallowing disorders associated with apnea episodes and gastroesophageal reflux. Polysomnography, barium pharyngoscopy, determination of blood gases, and esophageal pH measurements were undertaken before and 4 months after distraction osteogenesis. Bilateral corticotomies, followed by distraction with external devices, were performed, achieving 7 to 19 mm of elongation (mean = 12 mm). Gastroesophageal reflux was found in 83% of cases associated with apnea episodes, but it disappeared after distraction osteogenesis. Mean preoperative oxygen saturation was 72%, and it was 93% afterward. The preoperative apnea index was 18.3, and the preoperative 8.5 hypopnea index was 8.5; both disappeared. Pharyngeal transit time became less than 1 second after treatment. Abnormal tongue movements and barium stasis in the pharyngeal recess and in the trachea were eliminated in all the patients.
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PMID:Swallowing disorders in Pierre Robin sequence: its correction by distraction. 1554 78


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