The best replacement for ventricle is atrium.

The best alternatives to ventricle are rated as following:
★★★★★  atrium
★★★★  right ventricle
★★★  atria
★★★  left ventricle
★★  cistern
★  atrium has thicker walls

Your alternative for ventricle is not listed? Suggest!
Speaking about ventricle, one probably shouldn't forget about pulmonary atresia.

Other search terms related to ventricle and their ratings are:
★★★★★ pulmonary atresia
★★★★★ mitral atresia
★★★★ transposition of great vessels
★★ double inlet
★ hypoplastic left ventricle
★ truncus arteriosus
★ tricuspid atresia
★ third ventricle
★ transposition of the great arteries
You have in mind a companion for ventricle and it is not yet here? Propose!



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ventricle
atrium
right ventricle