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Isolated heart conduction system showing atrioventricular node. The AV node receives two inputs from the right atrium: posteriorly, via the crista terminalis, and anteriorly, via the interatrial septum. [8] Contraction of heart muscle cells requires depolarization and repolarization of their cell membranes. Movement of ions across cell ...
Late fibrosis stage. It is the stage of healing by which the fibrosis of the Aschoff nodules occur in 12 to 16 weeks after the illness. The nodule becomes oval or fusiform in shape about 200 micrometer x 600 micrometer in width and length. With passage of months and years the Aschoff nodules becomes less cellular and collagenous tissue is ...
A subset of the primary tumors of the heart are tumors that are found on the valves of the heart. Tumors that affect the valves of the heart are found in an equal distribution among the four heart valves. [2] The vast majority of these are papillary fibroelastomas. Primary tumors of the valves of the heart are more likely to occur in males.
The evaluation of a skin nodule includes a description of its appearance, its location, how it feels to touch and any associated symptoms which may give clues to an underlying medical condition. [4] Often discovered unintentionally on a chest x-ray, a single nodule in the lung requires assessment to exclude cancer. [9]
It contains the heart, esophagus, trachea, thymus, and aorta. The most common mediastinal masses are thymoma (20% of mediastinal tumors), usually found in the anterior mediastinum, followed by neurogenic Timor (15–20%) located in the anterior mediastinum. [1] Lung cancer typically spreads to the lymph nodes in the mediastinum.
Patients with heart tumours usually have non-specific symptoms, such as dyspnea (in particular, shortness of breath when lying down), thoracoabdominal pain (pain in the general area around the heart), fatigue, hemoptysis, nausea and vomiting, fever, weight loss, and night sweats.
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For example, in most humans, this is a single artery, although in some cases there have been either 2 or 3 sinoatrial node arteries supplying the SA node. Also, the SA node artery mainly originates as a branch of the right coronary artery ; however in some individuals it has arisen from the circumflex artery , which is a branch of the left ...
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