Mediastinum Flashcards
Boundaries
Pulmonary cavity, sternum and vertebral column
Mediastinal changes
Widen with tumors, effusions
Narrow with lung masses, pleural effusionsI
Inferior mediastinum
Anterior - contains fat, vessels, remnants of thymus
Middle - contains heart, great vessels, arch of azygos, phrenic n, main bronchi
Posterior
Heart coverings
Fibrous pericardium, serous pericardium
Serous pericardium
Parietal, visceral
Separated by sinuses
Visceral pericardium
Endo - mto - endo
Transverse sinus
Between aorta/pulm trunk and SVC/IVC
Oblique sinus
Behind left atrium, allows It expand
Beck’s triad
Cardiac tamponade - due to blood accumulation in pericardium
Hypotension, jugular v. distension, muffled heart sounds
Pericarditis
Inflammation of pericardium
Friction rub
Nerve that radiates pain is phrenic
Pericardial effusion
Fluid in pericardium
Hemopericardium
Blood in pericardium
Pericardiocentesis
Remove fluid in pericardial effusion and hemopericardium, in left 5th or 6th ICS, infrasternally or laterally
Arterial supply of pericardium
Pericardiacophrenic artery
Cononary arteries (on visceral pericardium)
Venous supply of pericardium
Pericardiacophrenic veins
Azygous veins
Innervation of pericardium
Sensory - phrenic n.
Sympathetic - cardiopulmonary splanchnic n. (T1-T4)
Parasympathetic - vagus nerve