How would the nurse interpret the following arterial blood gas? pH 7.31. PaCO2 48 mm Hg. Bicarbonate 24 mEq/L PaO2 115 mm Hg. 02 saturation 99%.

Rationale:
A. Controlled ventilation is the preferred mode for most patients is incorrect because controlled ventilation (CMV) is typically reserved for patients who are heavily sedated, paralyzed, or unable to initiate breaths. Most patients tolerate assisted or synchronized modes (like SIMV or PSV) better, which allow some spontaneous breathing and reduce complications associated with full control ventilation.

B. Communication with intubated patients is often difficult is correct because mechanical ventilation via an endotracheal tube or tracheostomy prevents verbal speech. Patients may experience anxiety, frustration, and difficulty expressing needs. Nurses often use nonverbal communication tools, such as writing boards, communication apps, or hand signals, to facilitate interaction.

C. Wrist restraints are applied to all patients to avoid self-extubation is incorrect because restraints are not routinely applied. They are used only when necessary to protect the patient from removing tubes or lines. Overuse of restraints can cause physical and psychological harm and should be avoided whenever possible.

D. Patients with chronic obstructive pulmonary disease wean easily from ventilation is incorrect because patients with COPD often have difficulty weaning due to limited pulmonary reserve, hypercapnia, and respiratory muscle fatigue. Weaning requires careful assessment, gradual reduction of ventilator support, and sometimes adjunct therapies like bronchodilators or noninvasive ventilation.

Rationale:
A. Urine output of 10 mL/h is correct because oliguria (urine output < 0.5 mL/kg/h or roughly < 30 mL/h in adults) is a key indicator of inadequate perfusion and insufficient fluid resuscitation. In burn or shock patients, adequate fluid resuscitation is essential to maintain renal perfusion and prevent acute kidney injury. A urine output of 10 mL/h suggests hypoperfusion and ongoing intravascular volume deficit.

B. Urine output of 50 mL/h is incorrect because this indicates adequate renal perfusion and suggests that fluid resuscitation is likely sufficient. This meets or exceeds the target urine output for most critically ill patients.

C. Respiratory rate of 16 is incorrect because this is within normal limits (12–20 breaths/min) and does not indicate hypovolemia or inadequate fluid resuscitation.

D. Blood pressure of 120/80 mmHg is incorrect because this is a normal blood pressure. While hypotension can be a late sign of inadequate fluid resuscitation, a normal BP does not necessarily indicate inadequate resuscitation on its own, especially in early shock where compensatory mechanisms maintain BP.