Please assess the completion status of the following clinical trial:

Trial Title: Effects of Oxygen on Lung Tissue During Anesthesia

Study Design Characteristics:
- Allocation: None
- Intervention Model: None
- Observational Model: CASE_ONLY
- Primary Purpose: None
- Time Perspective: PROSPECTIVE
- Masking: None
- Phase: None
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~* American Society of Anesthesiologists (ASA) Class I-III.~* Patient is undergoing elective surgery requiring mechanical ventilation~* Patient is an adult, 18 - 80 years old.~* Subject has voluntarily signed and dated the informed consent document approved by the Institutional Review Board (IRB).~Exclusion Criteria:~* Surgical procedures boarded for less than 2 hours~* Current Smoker~* All Cardiac, Thoracic and/or Vascular surgeries involving the chest~* Patient unable to cooperate.~* Chronic airway diseases~* Asthma~* Medical contraindication to anesthetic technique (allergy, cardiac condition, neurologic condition, localized infection, bleeding disorder).~* Subjects who are pregnant.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 80 Years
- Healthy Volunteers: f

Based on this trial design, predict the completion outcome and termination type (if applicable).