<s>[INST] Hi, may I answer your health queries right now ?  Please type your query here...my one year old nephew - birthday today - is in emergency and they (dr) has said either enlarged heart or water on the heart - please explain.  thank you - has been a healthy kid up til now. [/INST] clinical features: shortness of breath, swollen legs particularly around the ankles, most marked when you go to bed. in ability to lie flat in bed needing several pillows. in an x-ray- as hazy lines in between the lung segments an echocardiogram: can accurately assess the enlargement and weakness of the heart (termed heart failure if the EF is less than 40% - normal being > 60%) </s>