When someone has tuberculosis, the goal is to limit the spread of airborne particles as they move through shared spaces. The best approach for a patient leaving the isolation room is to have them wear a surgical mask. This provides source control—catching droplets expelled by the patient when they cough, sneeze, or even talk—so others in the hallways are less exposed. An N95 mask is the level of protection used by healthcare workers entering the room to protect themselves from inhaling TB bacteria; it’s not worn by the patient. Wearing no mask would miss that source-control step, increasing the chance of transmission. Gloves don’t address airborne spread and aren’t indicated simply for stepping out of the room.

Lowering arterial CO2 decreases intracranial pressure by causing cerebral vasoconstriction, which reduces cerebral blood volume. In a patient with a subdural hematoma, a PaCO2 of 30 mm Hg is below normal and can be used as an acute, controlled means to lower ICP. This is why the result is considered appropriate: targeting a lower CO2 helps reduce pressure within the skull and can stabilize the patient in the short term. Normal PaCO2 SAMPLEis about 35–45 mm Hg, so 30 mm Hg is not normal. It isn’t an indication of alveolar hypoventilation, which would raise CO2 rather than lower it. Oxygenation status isn’t provided, so labeling it emergent for poor oxygenation isn’t warranted based on CO2 alone.

IV nitroglycerin rapidly dilates veins, lowering preload and reducing myocardial oxygen demand, which helps chest pain but can cause dangerous drops in blood pressure. The priority action is to assess blood pressure and heart rate, and to hold the infusion if the systolic BP falls below 90 mmHg or the patient becomes symptomatic, then notify the prescriber. This safety step allows dose adjustments or discontinuation as needed to prevent hypotension and maintain perfusion. Increasing the infusion rate would risk worsening hypotension; discontinuing without notifying the prescriber could leave the patient unstable or in pain; switching to an oral nitrate would not provide the same rapid, controlled effect during acute chest pain.

Liver glycogen serves as a quick glucose reserve to keep blood sugar stable when intake is low or insulin lowers glucose. If liver disease reduces glycogen formation, the liver’s stores are smaller, so there’s less glucose available for rapid release during fasting or after insulin administration. That diminished reservoir makes it easier for blood glucose to drop to hypoglycemic levels in a client with type I diabetes. The other ideas don’t fit as well: increased gluconeogenesis would tend to raise or stabilize glucose rather than cause hypoglycemia; there’s little to no endogenous insulin production in type I diabetes, so enhanced insulin production isn’t the issue; and excessive glycogenolysis would raise blood glucose, whereas liver disease often impairs the ability to mobilize glycogen quickly.