What to know about fasting before your lab test. With certain blood tests, you may be instructed to fast for up to eight hours before your appointment. Fasting before a blood draw means you donât eat or drink anything except water. Donât wait until the day of your blood draw to ask if you should fast. That could cause your appointment to be rescheduled.
Three described morphological types of emphysema. Centriacinar emphysema begins in the respiratory bronchioles and spreads peripherally. Also termed centrilobular emphysema, this form is associated with long-standing cigarette smoking and predominantly involves the upper half of the lungs. Panacinar emphysema destroys the entire alveolus uniformly and is predominant in the lower half of the lungs.
Right ventricular hypertrophy. Description, Causes and Risk Factors: Abbreviation: RVH. Right ventricular hypertrophy is the increase or the enlargement in the size of the right ventricle of the heart. The right ventricle is responsible for pumping blood towards the lungs. In the lungs, blood is mixed with oxygen and then pumped back to the left ventricle to be eventually distributed to the brain and to other parts of the body. There are several possible causes of right ventricular hypertrophy.