On the second postoperative day, a client reports increasing abdominal pain. Assessment findings include a distended abdomen with absent bowel sounds. Which intervention should the nurse anticipate implementing?

Choice A reason: Taking two more readings confirms elevated BP, as a single reading may reflect technique errors or transient factors like pain, which increase sympathetic activity and vasoconstriction. Multiple readings ensure accuracy, critical for diagnosing hypertension and guiding intervention to prevent cardiovascular complications like stroke.

Choice B reason: Assigning a UAP to recheck BP in an hour delays assessment of potentially dangerous hypertension, which risks acute complications like myocardial ischemia. Immediate confirmation is needed, as elevated BP from norepinephrine release increases vascular resistance, making delayed rechecking inappropriate for urgent evaluation.

Choice C reason: Retaking BP in the opposite arm verifies accuracy, as differences may indicate arterial occlusion. Elevated BP increases catecholamine-driven vascular resistance. Measuring both arms rules out localized issues, ensuring reliable data to guide management of hypertension, critical to prevent end-organ damage like renal failure.

Choice D reason: Assessing apical-radial pulse deficit is relevant for atrial fibrillation, not directly for elevated BP. Hypertension results from increased vascular resistance, not pulse discrepancies. Confirming BP and assessing context are more immediate to determine urgency, making this less relevant than verifying readings or identifying triggers.

Choice E reason: Determining activity and feelings identifies transient BP elevation causes, like stress or exercise, which raise norepinephrine, increasing heart rate and vascular tone. This contextualizes the reading, differentiating situational from chronic hypertension, ensuring appropriate intervention to manage cardiovascular risk and guide further assessment.

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.