Decreased oxygen requirements-rationale: a client who is free from infection will most likely have decreased oxygen requirements. a client with infection will display increased sputum production, fever, shortness of breath, decreased activity tolerance, and increased oxygen requirements. client needs category: safe, effective care environment client needs subcategory: management of care cognitive level: application reference: smeltzer, s.c., et al. brunner & suddarths textbook of medical-surgical nursing,11th ed. philadelphia: lippincott williams & wilkins, 2008, p. 700.