Parenteral Nutrition is a medical method of providing nutrients directly into the bloodstream, bypassing the digestive system. This is often used for patients who cannot eat or absorb food normally due to conditions like gastrointestinal disorders or after major surgeries. It delivers essential vitamins, minerals, carbohydrates, proteins, and fats, ensuring that patients receive the necessary nutrition for recovery. Ventilation refers to the process of providing mechanical support for breathing in patients who cannot breathe adequately on their own. This can be due to various medical conditions, including respiratory failure or severe lung diseases. Mechanical ventilation helps maintain oxygen levels and remove carbon dioxide, supporting the patient's respiratory function until they can breathe independently again.