<prompt> Answer this question truthfullyCould you clarify what you mean by proper English? The original sentence What is cardiac syndrome X? is already grammatically correct in standard English.  <response>: <reason> Female gender and left ventricular hypertrophy are associated with an excess risk of syndrome X. The onset in women often occurs after menopause. Syndrome X and its accompanying microvascular dysfunction are not associated with traditional cardiovascular risk factors. Syndrome X has been associated with elevations of inflammatory markers such as: C reactive protein and soluble CD40 ligand. 