The present invention relates to certain 1,2-dihydro-spiro[3H-indole-3,4′-piperidine]compounds of Formula (Ia): and pharmaceutically acceptable salts, solvates and hydrates thereof, wherein G, R1, R2, R3, R4, R5, and Ar are as disclosed herein (“Compound(s) of the Invention”), which are useful, for example, as cardio-protective and/or neuro-protective agents. The invention also provides pharmaceutical compositions comprising a Compound of the Invention and methods for treating, preventing and/or managing a vascular, cardiovascular or neurological disease or disorder, comprising administering to a patient in need thereof a Compound of the Invention.