Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0042963 (vomiting)
 31,883 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The speculative efforts of the scientists who research the atavistic enigma of the "spontaneous" aches which affect the head, nuc and neck of a great number of people, seem to be driven by the conviction that they are faced with a systemic autonomic illness rather than a local one. Pain is an obligatory phenomenon which dominates this ailment, and is more or less patently paralleled by a constellation of autonomic functions such as nausea, vomiting, vaso-constrictor dilation and arterial hypotension. An analogous vegetative constellation emerges at "cascades", that is, a stereotypical succession, following upon intense physiological (induced) pain. In a migraine attack, the autonomic hyperfunctions are the same in quality but their chronology is completely disrupted: the usual vegetative "cascade" being deeply perverted. In spite of concentric assaults by clinicians, biologists, rhythmologists and psychologists this species of medical sphynx has remained throughout the centuries. The core of the dilemma is in essence the following: are we dealing with a physiological or a pathological pain? The former (physiological pain) should be symptomatic of vascular (migraine) or psychic (muscle contraction headache) disorder; the latter (pathological) should be symptomatic of a malfunctioning of the nociceptor system.
 ...
PMID:Concluding remarks on the Capri symposium: myths, facts and new trends in migraine. 661 7

Hyperthyroidism or increased thyroid function has been reported in many patients with trophoblastic tumors. In these cases, greatly increased human chorionic gonadotropin (hCG) levels and suppressed TSH levels suggest that hCG has thyrotropic activity. Recent investigations have clarified the structural homology not only in the hCG and TSH molecules but also in their receptors, and this homology suggests the basis for the reactivity of hCG with the TSH receptor. The clinical significance of the thyrotropic action of hCG is now also recognized in normal pregnancy and hyperemesis gravidarum. Highly purified hLH binds to recombinant hTSH receptor and is about 10 times as potent as purified hCG in increasing cAMP. The beta-subunits of hCG and hLH share 85% sequence identity in their first 114 amino acids but differ in the carboxy-terminal peptide because hCG beta contains a 31-amino acid extension (beta-CTP). A recombinant mutant hCG that lacks beta-CTP showed almost identical potency to LH on stimulation of recombinant hTSH receptor. If intact hCG were as potent as hLH in regard to its thyrotropic activity, most pregnant women would become thyrotoxic. One of the roles of the beta-CTP may be to prevent overt hyperthyroidism in the first trimester of pregnancy when a large amount of hCG is produced by the placenta. Nicked hCG preparations, obtained from patients with trophoblastic disease or by enzymatic digestion of intact hCG, showed approximately 1.5- to 2-fold stimulation of recombinant hTSH receptor compared with intact hCG. This suggests that the thyrotropic activity of hCG may be influenced by the metabolism of the hCG molecule itself. Deglycosylation and/or desialylation of hCG enhances its thyrotropic potency. Basic hCG isoforms with lower sialic acid content extracted from hydatidiform moles were more potent in activating adenylate cyclase, and showed high bioactivity/immunoactivity (B/I) ratio in CHO cells expressing human TSH receptors. This is consistent with the finding that the beta-CTP truncated hCG with higher thyrotropic potency is substantially deglycosylated and desialylated in the beta-subunit relative to intact hCG because all four O-linked glycosylation sites occur within the missing C-terminal extension. The desialylated hCG variant also interacts directly with recombinant hTSH receptors transfected into human thyroid cancer cells. There is thyroid-stimulating activity in sera of normal pregnant women, and this correlates with serum hCG levels. The thyroid gland of normal pregnant women may be stimulated by hCG to secrete slightly excessive quantities of T4 and induce a slight suppression of TSH, perhaps being about 1 mU/L less than nongravid levels, but not high enough to induce overt hyperthyroidism. Maternal thyroid glands may secrete more thyroid hormone during early pregnancy in response to the thyrotropic activity of hCG that overrides the normal operation of the hypothalamic-pituitary-thyroid feedback system. Biochemical hyperthyroidism associated with hyperemesis gravidarum has been attributed to hCG. In patients with hyperemesis gravidarum, thyrotropic in serum correlated with hCG immunoreactivity, and the severity of vomiting as indicated by clinical and biochemical parameters correlated with the degree of thyroid stimulation. To understand the thyrotropic action of hCG, it is necessary to know whether hCG activates the same domain of the TSH receptor as does TSH. The identification of the molecular structure of the hCG isoform with the highest thyrotropic potency will resolve the enigma of gestational thyrotoxicosis and the hyperthyroidism associated with trophoblastic disease and hCG-producing tumors.
 ...
PMID:Thyrotropic action of human chorionic gonadotropin. 856 83

Ingestion of a foreign body (FB) is a prevalent condition among children. The type of FB varies according to the feeding habits and sociocultural features of communities. The management modality differs also between disciplines due to use of conventional techniques. We aimed to picture the general characteristics of FB ingestion and treatment alternatives, to mention the indications of open surgery in an advanced pediatric surgical center. The records of patients who were hospitalized for FB ingestion between 1973 and May 2005 were evaluated retrospectively. One hundred and twelve patients were enrolled into the study. The mean age was 2.27 +/- 2.84 years with a M/F ratio of 59/53. The history was suggestive of ingestion in 92% of patients. The age did not differ significantly whether the history was positive or negative (3.6 years vs. 4.8 years and P = 0.19). Most common presenting symptom was vomiting (28.6%). The duration of symptoms was longer in patients with negative history (median 47.7 h vs. 28.1 h and P < 0.002). Physical examination was normal in 89.3% of cases. Most common localization of the FB shown in plain X-ray was the esophagus (67%). Esophagography revealed nonopaque FB in the esophagus in 4.4%. X-ray was normal in 6.3% of the patients. The age of patient did not determine the localization of FB on admission (P = 0.436). Endoscopic removal was attempted in 75% and was successful in 68% of patients in which FB was extracted by using laryngoscope and Magill forceps (12%), rigid esophagoscope with FB forceps (51%), and flexible endoscope with FB forceps (5%). FB could not be found in 32% of patients at initial rigid esophagoscopy or flexible endoscopy. FB was eliminated spontaneously (n = 19) or extracted surgically (n = 8). Follow-up was preferred in 21% of patients on initial admission. FB proceeded uneventfully in 15 patients or was extracted by flexible endoscopy or surgery in one and eight patients, respectively. Surgery was performed in 4% on admission. Surgery or endoscopy were essentially required in cases whose follow-up period exceeded 4 days when compared with patients who eliminated FB spontaneously within 4 days, independent to the location of FB. The metallic objects were the frequently ingested FBs (83.8%) in which the safety pins (SPs) (n = 53) and coins (n = 25) were the most frequent. The type of FB did not affect the FB localization on admission (P = 0.38). The duration of hospitalization was longer in patients with delayed admission; 2.46 +/- 3.51, 3.80 +/- 8.17, and 5.72 +/- 4.24 days for the admissions within first, second-fifth days, and sixth or later days after ingestion, respectively (P = 0.000). Pediatric surgery has the largest spectrum of duty in the treatment of FB ingestion in children. Negative history, normal physical examination findings and absence of symptoms do not exclude the possibility of FB ingestion. Presentation with isolated respiratory symptoms is an enigma that can lead to misdiagnoses. The mode of management should be selected according to the patient's condition, surgeon's experience, and available technical equipment as well as the location and type of ingested FB. Especially, SPs should be treated by experienced surgeons. Simple extraction techniques and both rigid and flexible endoscopies with appropriate forceps as well as surgery can be used for the extraction of FBs lodged in the alimentary tract. Surgery can be expected especially in asymptomatic cases that have been followed up for more than 4 days irrespective of the location of FB.
 ...
PMID:Foreign body ingestion in children: an analysis of pediatric surgical practice. 1756 61

Stroke-like episodes (SLEs) are the hallmark of mitochondrial encephalopathy with lactic acidosis and stroke-like episode (MELAS) syndrome but rarely occur also in other specific or nonspecific mitochondrial disorders. Pathophysiologically, SLLs are most likely due to a regional disruption of the blood-brain barrier triggered by the underlying metabolic defect, epileptic activity, drugs, or other factors. SLEs manifest clinically with a plethora of cerebral manifestations, which not only include features typically seen in ischemic stroke, but also headache, epilepsy, ataxia, visual impairment, vomiting, and psychiatric abnormalities. The morphological correlate of a SLE is the stroke-like lesion (SLL), best visualised on multimodal MRI. In the acute stages, a SLL presents as vasogenic edema but may be mixed up with cytotoxic components. Additionally, SLLs are characterized by hyperperfusion on perfusion studies. In the chronic stage, SLLs present with a colorful picture before they completely disappear, or end up as white matter lesion, cyst, laminar cortical necrosis, focal atrophy, or as toenail sign. Treatment of SLLs is symptomatic and relies on recommendations by experts. Beneficial effects have been reported with nitric-oxide precursors, antiepileptic drugs, antioxidants, the ketogenic diet, and steroids. Lot of research is still needed to uncover the enigma SLE/SLL.
 ...
PMID:Mitochondrial metabolic stroke: Phenotype and genetics of stroke-like episodes. 3094 93