What is a contraindication to performing IV therapy?

In the context of hyperbaric medicine, a major contraindication to performing intravenous (IV) therapy is cardiopulmonary decompression sickness (DCS). This condition occurs when nitrogen bubbles form in the blood or tissues, which can adversely affect circulation and gas exchange in the lungs. During an episode of cardiopulmonary DCS, the cardiovascular system may be compromised, presenting a critical risk when administering IV fluids. Infusing fluids could exacerbate pulmonary complications or lead to further cardiovascular instability, thereby worsening the patient's condition.

For this reason, it is crucial to assess the presence of DCS or any other severe cardiopulmonary conditions prior to initiating IV therapy. It ensures the safety and effectiveness of treatment, as the patient's ability to tolerate additional fluid without risking further complications is of paramount importance. On the other hand, while severe dehydration, allergic reactions to saline, and low blood pressure can pose challenges to IV therapy, they are not absolute contraindications in the same way as cardiopulmonary DCS. Each of those conditions can often be managed or mitigated with appropriate monitoring and medical intervention, making it feasible to administer IV fluids in those scenarios.