A nurse assesses a patient who has ulcerative colitis and severe diarrhea. Which assessment would the nurse complete first?

Choice A rationale The patient's severe diarrhea poses a significant risk for fluid and electrolyte imbalances, particularly hypokalemia and dehydration, which can lead to life-threatening cardiac dysrhythmias. Assessing heart rate and rhythm first is a priority because it directly evaluates the most immediate and potentially fatal consequence of these imbalances, ensuring the patient's hemodynamic stability and preventing cardiac arrest. Choice B rationale Percussion of the abdomen, while part of a comprehensive abdominal assessment, is a lower priority in this acute situation. It provides information about distension and gas patterns but does not address the immediate physiological threat of hypovolemia and electrolyte shifts that can precipitate cardiac complications. This action can be performed after the more critical vital signs are assessed. Choice C rationale Inspecting oral mucosa provides a general indication of hydration status. However, this is a subjective assessment and less precise than directly assessing heart rate and rhythm, which can indicate the severity of electrolyte imbalances and dehydration. The priority is to assess for the most critical complication, which is cardiac dysrhythmia. Choice D rationale Assessing recent dietary intake is important for understanding the patient's nutritional status and potential triggers for diarrhea. However, this is a historical data-gathering step and does not address the immediate, life-threatening physiological changes occurring from severe diarrhea. This information is a low priority in an acute situation where the patient's vital signs are at risk.