What central venous pressure (CVP) reading indicates a positive response to treatment for dehydration?

A central venous pressure (CVP) reading of 4 mm Hg indicates a positive response to treatment for dehydration. In clinical practice, CVP is often used to assess the volume status of a patient.

In cases of dehydration, the CVP tends to be lower due to reduced circulating blood volume. As treatment progresses and the patient's fluid status improves, a rise in CVP typically reflects that the intravascular volume is being restored.

A CVP of 4 mm Hg falls within a generally acceptable range for patients who are rehydrating, suggesting that the treatment is effective in improving their volume status. This indicates that the body's compensatory mechanisms are working, and the fluid administration is having a positive effect on the patient's hemodynamics.

Higher readings may suggest overhydration or other issues, whereas a negative value, like -1 mm Hg, is generally non-physiological and indicates severe hypovolemia or intrathoracic pressure changes. Thus, the reading of 4 mm Hg is indicative of an improvement after dehydration treatment.