An intracardiac shunt is a connection between two cardiac chambers or vessels that does not normally exist. This results in abnormal or altered and redirected blood flow. Intracardiac Shunt. Atrial Septal Defect (ASD) (see Atrial Septal Defect, [[Atrial Septal Defect]]). L->R Shunt: normal direction of shunting in absence of pulmonary. Intracardiac shunting refers to the diversion of normal blood flow to alternate pathways within the heart as a result of a hole in structures that normally separate arterial from venous blood.


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Cardiac shunt - Wikipedia

Terminology[ edit ] Atrial septal defect with left-to-right shunt The left and right sides of the heart are named from a dorsal view, i.

Intracardiac shunt are four chambers in a heart: Blood is then pumped intracardiac shunt the lower left ventricle and from there out of the heart to the body via the aorta. This is called the systemic circulation. There is a slight decrease in the oxygen levels of blood in the carotid compared to the blood entering the heart from the pulmonary vein due to the fact that some oxygen has been consumed by the myocytes.

Nevertheless, by decreasing the oxygen levels in pulmonary venous blood, we ensured that the myocardium was bathed with blood containing a level of oxygen similar to that normally occurring in the systemic venous blood during exercise, even though the magnitude of the L-R shunt increased during activity.

Chapter 5: Intracardiac Shunts | European Heart Journal | Oxford Academic

The sensitivity of the myocardium to this range of Po2s was assessed with ECGs. These experiments are intracardiac shunt to as series 1: Blood gases and electrocardiograms.

We then investigated the relationship between the ECG patterns and cardiac performance by measuring cardiac output and ECGs simultaneously when subjecting turtles to the same experimental regime. In addition, we were able to obtain arterial pressure measurements from three of these animals to examine cardiac power.

Intracardiac shunts - UKDMC

These experiments are referred to as series 2: Blood flow and electrocardiograms. In summary, our experimental design intracardiac shunt to examine the ECG of a vigorously working heart while the heart was supplied with oxygen by blood that had a partial pressure of oxygen similar to what is found in the mixed systemic venous return of exercising turtles.

Animals Red-eared sliders, Trachemys scripta, of mixed sex weighing 1.

The animals were housed in large aquariums equipped with dry basking areas and heat lamps. They were fed a diet of live goldfish and kept under a Four sides were constructed of acrylic and two ends of plastic grid. This chamber was set in a water-filled flume. The air-hole had a port on each end that allowed gases intracardiac shunt pass through the chamber.

However, not all of the catheters were patent during the experiments. ECGs were obtained from all five animals.


Surgery Turtles were anesthetized with halothane and the neck injected with Lidocain. The carotid and jugular were catheterized PE 50 tubing and the jugular catheter was slid intracardiac shunt the vena cava to obtain samples of the mixed systemic venous return.

Intracardiac shunt of the catheters were confirmed post-mortem.


Catheters were flushed twice daily with heparinized saline iu.