Experimental heart block in the dog

dog footprint in the heart

cardiac manifestations of the hydatid cyst are relatively uncommon. cardiac involvement may lead to the compression of vital organs, pulmonary hypertension, pericardial effusion, and even anaphylaxis. a 45-year-old woman presented to the emergency department of tehran heart center with chest pain. cardiac examination revealed relatively muffled heart sounds. echocardiography demonstrated a roun...

Cardiodynamic effects of experimental bundle-branch block in the dog.

• There is disagreement as to whether bundle-branch block causes a delay in contraction of the homolateral (blocked) ventricle. Previous studies in animals and man have produced conflicting results. The majority of investigators have found that a delay in electrical activation of one of the ventricles, as occurs in bundle-branch block or an extrasystole originating in the contralateral ventricl...

Cardiac Norepinephrine Stores in Experimental Heart Failure in the Dog *

Although the underlying basis for the defective myocardial function characteristic of congestive heart failure has not been defined, the contractile state of the myocardium is known to be influenced by a number of determinants (1, 2), and an abnormality of any one of them could be a factor contributing to the defective performance of the failing heart. Prominent among the determinants of myocar...

Digitalis in experimental, surgically induced heart block.

Hyperkalemia-induced complete heart block

Background: Potassium, as an extracellular ion, plays an important role in the electrophysiologic function of the myocardium and any change in extracellular concentration of this ion might have a marked impression upon myocyte electrophysiologic gain. High serum potassium levels are thought to impair pulse conduction in Purkinje fibers and ventricles more than that in the Atrio...