Immediately after sustaining severe head injury, a 20-year-old man has a blood pressure of 150/90 mmHg and an intracranial pressure of 35 mmHg. After one hour of thiopental infusion, blood pressure is 105/60 mmHg, intracranial pres sure is 20 mmHg, central venous pressure is 5 mmHg, and temperature is 36°C. The EEG shows slow-wave activity. The most appropriate next step is administration of
A 35-kg child requires mechanical ventilation with pure oxygen at a tidal volume of 350 ml and a rate of 20/min during a severe asthma attack. The most likely cause of severe hypotension after initiating mechanical ventilation is
In a 5-kg child, the end-tidal carbon dioxide tension is 35 mmHg during spontaneous ventilation through a Mapleson D system. Which single change is most likely to increase this value?
A 30-year-old man is brought to the emergency department after being rescued from a house fire. With the trachea intubated and FiO2 at 1.0, arterial blood gas values are PaO2 495 mmHg, PaCO2 28 mmHg, and pH 7.28. Hemoglobin saturation measured by co-oximeter is 50%. The most appropriate next step is to