The quad cab has a smaller back seat and a larger bed, the crew cab has a larger back seat and a smaller bed. To compare them you can go to http://www.ramtrucks.com/en/2011/ram_150... and select the Build My Own option from the bottom of the page.
Heart muscle thickening (called cardiac hypertrophy) can be a healthy response to exercise and pregnancy; however, it often occurs in people with high blood pressure, diabetes, heart failure and certain genetic conditions.
HCM Program | What is HCM? Hypertrophic cardiomyopathy (HCM) is a complex cardiac disease marked by thickening of the heart muscle. In HCM patients cardiac muscular thickening occurs for no apparent clinical cause like significant high blood pressure.