This complex swirling pattern allows the heart to pump blood more effectively than a simple linear pattern would. The cardiac cycle is split into two phases: systole and diastole. Detectable symptoms in an infant include difficulty breathing, poor appetite, trouble feeding, or failure to thrive.
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Well-documented risk factors include smoking, family history, hypertension, obesity, diabetes, high alcohol consumption, lack of exercise, stress, and hyperlipidemia or high circulating levels of lipids in the blood. Heart Health and Aging.