Following surgery, a patient's central venous pressure (CVP) monitor indicates low pressures. Which action will the nurse anticipate taking?

Choice A rationale Central venous pressure reflects the filling pressure of the right atrium and is a primary indicator of venous return and intravascular volume status. A low CVP, typically less than 2 mmHg, usually indicates hypovolemia or a decrease in preload. In a post-surgical patient, this often results from fluid loss or inadequate replacement. Increasing the intravenous fluid infusion rate is the standard intervention to restore intravascular volume, improve cardiac output, and bring the CVP back to normal. Choice B rationale Elevating the head of the bed to 45 degrees is an intervention used to facilitate lung expansion or reduce intracranial pressure. However, in the context of a low CVP indicating hypovolemia, sitting the patient up can cause blood to pool in the lower extremities, further decreasing venous return to the heart and potentially causing a drop in blood pressure. If a patient is hypovolemic, a flat or slightly reclined position is usually preferred to support hemodynamics. Choice C rationale Diuretics are used to remove excess fluid from the body and would be indicated if the central venous pressure was abnormally high, suggesting fluid volume overload or right-sided heart failure. Administering a diuretic to a patient who already has a low CVP would worsen their hypovolemic state by further reducing the circulating blood volume. This could lead to severe hypotension, decreased organ perfusion, and eventually result in hypovolemic shock or acute kidney injury. Choice D rationale Simply documenting the low pressure and continuing to monitor is an insufficient response to an abnormal hemodynamic finding. A low CVP is an objective sign that the patient may be dehydrated or experiencing hemorrhage following surgery. While monitoring is necessary, the nurse must also anticipate and implement active interventions, such as fluid resuscitation, to correct the underlying volume deficit and prevent clinical deterioration. Ignoring the low value could delay essential treatment for the patient.