Which of the following is the most effective Indicator of improved ventilation in a patient with COPD after a nursing intervention?

Rationale: A. Cyanosis of the lips and fingertips is incorrect because cyanosis is a sign of hypoxemia and indicates poor oxygenation, not improved ventilation. Presence of cyanosis suggests worsening respiratory status. B. Increased use of bronchodilator medications is incorrect as this reflects ongoing or worsening respiratory difficulty rather than improvement. Needing more medication may indicate that the patient’s symptoms are not well controlled. C. Increased respiratory rate is incorrect because tachypnea can indicate respiratory distress or inadequate gas exchange. While an increased rate may temporarily improve oxygenation, it is not a reliable indicator of improved ventilation and can signify fatigue or worsening status in COPD patients. D. Decreased use of accessory muscles during breathing is correct because accessory muscle use indicates increased work of breathing and respiratory effort. When a patient shows less reliance on accessory muscles, it reflects that the lungs are ventilating more effectively, airway obstruction is reduced, and breathing has become more efficient. This is a direct, observable clinical sign of improved ventilation after interventions such as bronchodilator therapy, oxygen supplementation, or positioning.