Preload is the stretch. The amount of volume being returned to the right side of the heart from systemic circulation. Afterload is the squeeze. The amount of resistance the left side of the heart has to overcome in order to eject blood.
Most asthma sufferers use inhalers to control their breathing. The asthma inhaler gives quick relief when finding in hard to breath and control the asthma. There are many types of inhalers and they are prescribed to asthma patients according to their diag