my brother is 67 years old and very healthy and fit. Nothing medically wrong with him. Recently he had chest pains, and pains down his left arm , went to his GP, echocardiogram test okay, waiting for stress test, went on holiday, had the same sympomts whilst away, went to A&E, echocardiogram okay, but elevated creatinine of 130. How serious is this when he has nothing else medically wrong with him, apart from elevated cholsterol.