Final answer:
The immediate procedures required for a puppy with marked rightward mediastinal shift include oxygen therapy, intravenous fluid therapy, and thoracocentesis and chest tube placement.
Step-by-step explanation:
The immediate procedures required for a puppy with a marked rightward mediastinal shift would include:
- Oxygen therapy: This helps provide additional oxygen to the puppy's lungs, aiding in the resolution of any respiratory distress.
- Intravenous fluid therapy: This ensures that the puppy is adequately hydrated and helps maintain proper blood pressure and circulation.
- Thoracocentesis and chest tube placement: These procedures may be necessary to relieve any tension in the thoracic cavity caused by the mediastinal shift, allowing the lungs to expand properly and improving respiratory function.