A nurse is assessing a client who has hypertension and is receiving propranolol. Which of the following findings require an intervention by the nurse?

A. Heart rate of 56/min: Propranolol is a beta-blocker that can lower heart rate. A heart rate below 60/min may indicate bradycardia, which can be dangerous and requires intervention before administering the next dose. B. SaO2 95% on 2 L/min of oxygen: Oxygen saturation of 95% on supplemental oxygen is within an acceptable range and does not require immediate intervention. C. Blood pressure 106/68 mm Hg: While slightly on the lower side, this blood pressure is generally considered acceptable for many adults and does not typically necessitate an immediate intervention. D. Respirations 22/min: A respiratory rate of 22/min is mildly elevated but usually not critical. It does not require withholding propranolol or immediate intervention in a stable client.