A client newly diagnosed with eczema tells the clinic nurse of using a heat lamp to dry the fluid-filled blisters localized in the left antecubital area. How should the nurse respond?

Choice A reason: Blood pressure of 142/88 mm Hg indicates mild hypertension but does not directly affect pulse oximetry, which measures arterial oxygen saturation via hemoglobin light absorption. Hypertension does not typically cause hypoxemia (91% SpO₂). Edema is more likely, as it disrupts sensor accuracy, leading to false low readings.

Choice B reason: 2+ edema in fingers and hands impairs pulse oximeter accuracy, as fluid in tissues scatters light, reducing the sensor’s ability to detect arterial hemoglobin saturation. This causes falsely low SpO₂ readings (91%), common in edema from heart failure, making it the primary contributor to the inaccurate measurement.

Choice C reason: A radial pulse volume of 3+ indicates strong arterial flow, supporting accurate pulse oximetry by ensuring perfusion. This does not explain a low SpO₂ of 91%, as strong pulses enhance sensor reliability. Edema’s interference with light transmission is more likely to cause the reduced reading.

Choice D reason: Capillary refill of 2 seconds is normal, indicating adequate perfusion. This does not contribute to a low SpO₂ (91%), as pulse oximetry measures arterial flow, not capillary dynamics. Edema disrupts light transmission, causing inaccurate readings, making it the most likely cause of the observed saturation.

Choice A reason: Placing the chair by the bed is preparatory but not immediate after sitting up. Prolonged bedrest risks orthostatic hypotension from reduced plasma volume and baroreceptor sensitivity. Assessing the client’s response ensures stability before transfer, preventing falls, making this less urgent than evaluating for dizziness or hypotension.

Choice B reason: Supporting the client when rising is premature before assessing their response to sitting. Bedrest causes deconditioning, increasing orthostatic hypotension risk, leading to dizziness or syncope. Determining how the client feels confirms cardiovascular stability, preventing falls during transfer due to blood pressure drops.

Choice C reason: Determining how the client feels assesses for orthostatic hypotension, common post-bedrest due to reduced venous return and baroreceptor dysfunction. Dizziness or lightheadedness signals syncope risk during transfer. This ensures cardiovascular stability, prioritizing safety before physical support, addressing physiological changes from prolonged immobility.

Choice D reason: Offering non-skid socks prevents falls during ambulation but is secondary to assessing sitting response. Bedrest heightens hypotension risk, and ensuring the client is not dizzy takes precedence to avoid syncope. Socks are a later safety measure, making this less immediate than evaluating physiological stability.