A nurse is assessing an older adult client who has osteoporosis.
Which of the following spinal deformities should the nurse expect to find in this client?

Choice A rationale

Pulse oximetry measures the oxygen saturation of hemoglobin in peripheral blood, which is an indirect and less accurate measure of oxygen concentration in the blood, especially in patients with respiratory compromise or poor peripheral perfusion. It is non-invasive and provides an estimate (normal range 95-100%).

Choice B rationale

A capillary blood sample, typically obtained from a fingertip, provides information on blood glucose or lactate, but it is not the most accurate method for assessing arterial oxygen concentration due to its mixed venous and arterial components and potential for air exposure.

Choice C rationale

Assessment of the patient's nail beds provides a visual, qualitative assessment of peripheral perfusion and oxygenation (e.g., cyanosis), but it is subjective and not a precise or scientific measurement of the actual oxygen concentration in the blood.

Choice D rationale

An arterial blood gas (ABG) study directly measures the partial pressure of oxygen in arterial blood ($PaO_2$), along with carbon dioxide, pH, and bicarbonate. This provides the most accurate and precise assessment of oxygenation status and acid-base balance in the patient's blood. Normal $PaO_2$ is 80-100 mmHg.

Choice A rationale

Increasing oxygen flow without assessing the client's respiratory status first can be detrimental for a client with COPD. High oxygen concentrations can suppress the hypoxic drive, which is a primary stimulus for breathing in some COPD patients, potentially leading to hypoventilation and respiratory acidosis.

Choice B rationale

While coughing and expectorating secretions can improve airway clearance, it is not the initial priority when a client with COPD reports difficulty breathing. A comprehensive assessment is crucial to determine the underlying cause of dyspnea before implementing interventions that may not be appropriate.

Choice C rationale

Calling emergency services immediately without first assessing the client's respiratory status is premature. The nurse needs to gather more information to determine the severity of the client's condition and whether immediate emergency intervention is warranted, or if other actions can alleviate the distress.

Choice D rationale

Assessing the client's respiratory status is the priority action. This involves evaluating respiratory rate, depth, effort, use of accessory muscles, oxygen saturation (SpO2), and breath sounds. This provides objective data to guide further interventions and determine the severity of the respiratory distress.