Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0151744 (myocardial ischemia)
 31,282 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Equilibrium radionuclide angiocardiography (ERNA) was performed at rest in 30 patients with chronic respiratory failure (CRF) in order to evaluate right ventricular performance and wall motion. The usual indices of left ventricular performance were also recorded and correlated with right ventricular parameters. Only CRF patients without clinical, electrocardiographic or echocardiographic criteria suggestive of congenital, valvular, hypertensive or ischemic heart disease were studied. A RV dyskinesis was detected in 5 of the 30 patients, occurring however only in stage II-III CRF, as if a longstanding RV pressure overload were necessary for a RV dyskinesis to develop. No significant differences were found between patients with and without RV dyskinesis for all the functional ERNA parameters (i.e. LVEF, RVEF, PER, PFR). On the other hand, a significant correlation between the stage of the CRF and RVEF was observed.
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PMID:Right ventricular wall motion and performance in stabilized chronic respiratory failure evaluated by equilibrium radionuclide angiocardiography. 371 5

Transluminal coronary angioplasty (PTCA) causes transient occlusion of the coronary artery and temporary ischemia of the left ventricle. Left ventricular dysfunction during silent and symptomatic episodes of myocardial ischemia during PTCA was evaluated continuously with a newly developed miniature, non-imaging scintillation probe. Parameters of left ventricular function were compared before and during balloon inflations of 60 s duration: ejection fraction (EF), indices of end-systolic and end-diastolic volumes (ESV, EDV), peak ejection and peak filling rates (PER, PFR). 13 patients (age 54 +/- 7.4 years) were symptomatic, 10 patients (age 61 +/- 8 years) were asymptomatic. Impairment of left ventricular function during ischemia did not show any significant differences between the symptomatic and asymptomatic patients. It is therefore concluded that symptomatic and asymptomatic episodes of myocardial ischemia during PTCA cause similar impairment of systolic and diastolic left ventricular function. The degree of left ventricular dysfunction during PTCA cannot be estimated on the basis of clinical symptoms.
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PMID:[Left ventricular function during symptomatic and asymptomatic myocardial ischemia]. 829 25

The ability to sense and respond to changes in oxygen availability is critical for many developmental, physiological, and pathological processes, including angiogenesis, control of blood pressure, and cerebral and myocardial ischemia. Hypoxia-inducible factor-1alpha (HIF-1alpha) is a basic-helix-loop-helix (bHLH)containing member of the PER-ARNT-SIM (PAS) family of transcription factors that plays a central role in the response to hypoxia. HIF-1alpha, and its relatives HIF-2alpha/endothelial PAS domain protein (EPAS) and HIF-3alpha, are induced in response to hypoxia and serve to coordinately activate the expression of target genes whose products facilitate cell survival under conditions of oxygen deprivation. When cells are exposed to chronic hypoxia, the protective response can fail, resulting in apoptosis. This study shows that transcription of the gene encoding Nip3, a proapoptotic member of the Bcl-2 family of cell death factors, is strongly induced in response to hypoxia. The Nip3 promoter contains a functional HIF-1-responsive element (HRE) and is potently activated by both hypoxia and forced expression of HIF-1alpha. Exposure of cultured cells to chronic hypoxia results in the accumulation of a protein recognized by antibodies raised against Nip3. This study demonstrates a direct link between HIF-1alpha and a proapoptotic member of the Bcl-2 family and offers a reasonable physiological function for members of the Bcl-2 subfamily, including Nip3 and its close relative Nix. These observations indicate that Nip3 may play a dedicated role in the pathological progression of hypoxia-mediated apoptosis, as observed after ischemic injury.
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PMID:Expression of the gene encoding the proapoptotic Nip3 protein is induced by hypoxia. 1092 63