Cardiac defects without a shunt

1. Right Heart obstruction

Obstructions can occur at various levels in the right side of the heart or in the pulmonary outflow path. Pure obstructions do not result in a mixing of the blood but cause a massive additional strain on the ventricles because they have to pump against increased resistance.

2. Left Heart obstruction

(From: http://www.embryology.ch/anglais/pcardio/patholcardio01.html#rechtsherzobstruktion, http://www.embryology.ch/anglais/pcardio/patholcardio02.html#Linksherzobstuktion)
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