• venous
  • There are two atria in the human heart, which receive blood - the left atrium from the lungs, and the right atrium from the venous circulation. (wikipedia.org)
  • The atria do not have valves at their inlets and as a result, a venous pulsation is normal and can be detected in the jugular vein as the jugular venous pressure. (wikipedia.org)
  • In normal physiologic states, the output of the heart is pulsatile, and the venous inflow to the heart is continuous and non-pulsatile. (wikipedia.org)
  • But without functioning atria, venous flow becomes pulsatile, and the overall circulation rate decreases significantly. (wikipedia.org)
  • Venous return is the rate of blood flow back to the heart. (wikipedia.org)
  • Although the above relationship is true for the hemodynamic factors that determine the flow of blood from the veins back to the heart, it is important not to lose sight of the fact that blood flow through the entire systemic circulation represents both the cardiac output and the venous return, which are equal in the steady-state because the circulatory system is closed. (wikipedia.org)
  • This makes a pressure gradient between the infra- and supradiaphragmatic parts of v. cava inferior, "pulling" the blood towards the right atrium and increasing venous return. (wikipedia.org)
  • mitral
  • It was moving freely from the upper part of the left atrium to the lower part and was bouncing back after striking the mitral valve leaflets. (bmj.com)
  • pulmonary
  • Here we have characterized how AF frequency and dynamics on the endocardial surface of the PLA and pulmonary vein ostia (PVO) are affected by the amount, type (ie, diffuse versus patchy), and spatial distribution of fibrosis in failing hearts. (ahajournals.org)
  • sinus
  • Internally, there are the rough pectinate muscles and crista terminalis of His, which act as a boundary inside the atrium and the smooth walled part of the right atrium, the sinus venarum derived from the sinus venosus. (wikipedia.org)
  • The electrical activity of sinus rhythm originates in the sinoatrial node and depolarizes the atria. (wikipedia.org)
  • symptoms
  • CONCLUSION: Sustained AF was not induced by one extrastimulus in control patients without symptoms, nor heart disease, but sustained AF was induced by two extrastimuli in 22% of these patients. (biomedsearch.com)
  • This study will examine how heart stiffness and a weak atrium affect exercise capacity and symptoms in patients with hypertrophic cardiomyopathy (HCM). (clinicaltrials.gov)
  • Symptoms may include a feeling of the heart beating too fast, too hard, or skipping beats, chest discomfort, difficulty breathing, or loss of consciousness. (wikipedia.org)
  • tissue
  • Single human heart diseased tissue with 5 181m thickness is mounted on each positively charged glass slide. (insightbio.com)
  • pathway
  • however, this does not happen by the normal pathway of activation and instead is due to a backwards or retrograde conduction (conduction comes from the AV node into and through the atria). (wikipedia.org)
  • The pathway is thought to be important in maintaining heart function, as the ALCAT1 gene is conserved among many species of vertebrates, but not in organisms lacking heart atria. (wikipedia.org)
  • calcium
  • The atria are depolarised by calcium. (wikipedia.org)
  • Additionally, N-type calcium channels have known functions in the kidney, and heart. (wikipedia.org)
  • In addition to the α1 subunit, the following subunits are present in the N-type calcium channel: α2δ - CACNA2D1, CACNA2D2 β1 - CACNB1 β3 - CACNB3 β4 - CACNB4 N-type calcium channels are highly known for their function in the nervous system, but they are also involved with the function of the heart and kidneys. (wikipedia.org)
  • circulation
  • In a recent study, 7 we demonstrated that this procedure enables optical mapping of the PLA endocardium without any apparent damage to the circulation, and with AF frequencies and dynamics comparable to those observed in intact isolated hearts. (ahajournals.org)
  • body
  • ALCAT1 is widely distributed throughout the body, with the highest concentrations being in the heart and liver. (wikipedia.org)
  • rate
  • When it first occurs, it is usually associated with a fast heart rate and is classified as a type of supraventricular tachycardia. (wikipedia.org)
  • important
  • Long-term use of blood thinners (e.g., warfarin or apixaban) is an important component of treatment to reduce the risk of blood clot formation in the heart and resultant strokes. (wikipedia.org)
  • system
  • Intravenous cannula insertion: A plastic tube is inserted into an arm vein for collecting blood samples to measure substances that the heart and circulatory system release at rest and during exercise. (clinicaltrials.gov)