• The cord-like tendons emerge from small stacks of muscle tissue called papillary muscles that inwardly project from the walls of the ventricle. (knowyourbody.net)
  • As the left ventricle chamber decreases in size, the papillary muscles and/or the chordae fail to maintain tension on the mitral valve, and it prolapses with a brief regurgitant period into the left atrium. (ucla.edu)
  • The results of previous studies suggest that the maximum mechanical efficiency of rat papillary muscles is lower during a contraction protocol involving sinusoidal length changes than during one involving afterloaded isotonic contractions. (biologists.org)
  • The expression of CTGF mRNA and CTGF protein were detected with semiquantitative RT-PCR technique and immunohistochemistry technology in the papillary muscles cell from 38 RHD patients and 20 normal papillary muscles samples. (onlinejacc.org)
  • A band, mitochondrial, and junctional SR Ca 2+ were measured by electron probe microanalysis in CM and normal papillary muscles, which were either untreated or pretreated with BAY K 8644. (elsevier.com)
  • The effects of chronic respiratory failure (hypoxia and hypercapnia) on the contractile properties of cardiac muscle are not established. (bmj.com)
  • Rat cardiac muscle adapts successfully to the altered acid-base environment and increased work load associated with prolonged exposure to hypoxia and mild hypercapnia. (bmj.com)
  • Take a peek at these assistive images to know about the physical appearance of this cardiac muscle. (knowyourbody.net)
  • Acute myocardial infarct (MI), commonly known as a heart attack, is a condition characterized by ischemic injury and necrosis of the cardiac muscle. (medscape.com)
  • The efficiency of mechanical work generation by cross-bridges in cardiac muscle is poorly established because it is difficult to experimentally separate the initial and recovery energy costs. (biologists.org)
  • We tested the hypothesis that nitric oxide has a positive inotropic effect on mammalian cardiac muscle contractility and that this effect sums with the positive inotropic effect of β 1 -adrenergic agonists when both are present. (ingentaconnect.com)
  • Recombinant proteins were reconstituted into RLC-depleted porcine cardiac muscle preparations and subjected to enzymatic and functional assays. (frontiersin.org)
  • Our results showed that the amino-acid changes in IVS6-1 were sufficient to impose significant conformational alterations in the RLC protein and trigger a series of abnormal protein-protein interactions in the cardiac muscle sarcomere. (frontiersin.org)
  • Recent studies have reported that idiopathic focal ventricular arrhythmias (VAs) can originate from the papillary muscles (PAMs) in the left ventricle (LV) and it is consistent that catheter ablation of these VAs is challenging as compared with the other VAs in the LV (1-4) . (onlinejacc.org)
  • In addition, TTE can identify and quantify the degree of MR and rule out other causes of MR, such as secondary to papillary muscle rupture and primary MR. Other valuable information include the presence of other valvular pathology, the degree of ventricular dysfunctions, free wall rupture, cardiac infront of tamponade, pulmonary embolism, and aortic dissection/rupture. (springer.com)
  • The critical diagnosis of this neoplasm is often difficult because of its similarity with other primary or secondary papillary lesions of the pineal region, including parenchymal pineal tumors, papillary ependymoma, papillary meningioma, choroid plexus papilloma, and metastatic papillary carcinoma. (wikipedia.org)
  • Methods Among 155 consecutive patients with normal structural heart who underwent catheter ablation of PVC/VT, 8 patients with PVC/VT from the septal RV PAP muscle were identified. (elsevier.com)