Long term prognosis for recovery of your cat will vary from cause to cause. Infections and pneumonia are serious illnesses that need a high degree of specialized veterinary care. In all cases, your cat’s chances for a full recovery will increase if immediate veterinarian care is sought as soon as initial symptoms are detected. Additionally, given the seriousness of lung and breathing issues, you should follow up after symptoms in your cat have resolved in order to prevent potential recurrence.
Rapid breathing (tachypnea) is a respiratory disorder characterised by abnormal breathing that is rapid and shallow.  It is caused by a reduced level of oxygen, mechanical disorders (where the lungs aren’t able to expand as they should, usually due to a build-up of fluid in or around the lungs), and physiological disorders in which the cat’s respiratory centre in the brain is over stimulated.