The nurse is caring for a postoperative client who has a chest tube connected to suction and a water seal drainage system. Which of the following indicates to the nurse that the chest tube is functioning properly?

Choice A: Drainage of clear fluid from the ears is not an expected finding for a client who has an epidural hematoma, but rather a sign of a basilar skull fracture, which is a different type of head injury. The clear fluid is cerebrospinal fluid (CSF), which leaks from the brain through the fractured skull.

Choice B: Alternating periods of alertness and unconsciousness is an expected finding for a client who has an epidural hematoma, because it indicates a rapid increase in intracranial pressure (ICP) due to bleeding between the dura mater and the skull. The client may have a brief loss of consciousness at the time of injury, followed by a lucid interval, and then a rapid deterioration of mental status.

Choice C: Narrowing pulse pressure is not an expected finding for a client who has an epidural hematoma, but rather a sign of increased ICP due to any cause. Pulse pressure is the difference between systolic and diastolic blood pressure. As ICP rises, it compresses the brainstem and causes bradycardia and hypertension, resulting in a decreased pulse pressure.

Choice D: Extensive bruising in the mastoid area is not an expected finding for a client who has an epidural hematoma, but rather a sign of a basilar skull fracture, which is a different type of head injury. The bruising is also known as Batle's sign, and it occurs due to blood pooling behind the ear.

Choice A Reason: This choice is incorrect because administering a vasodilator medication may lower the blood pressure and worsen the cerebral perfusion. A vasodilator medication is a drug that relaxes the blood vessels and reduces the resistance to blood flow. It may be used for clients who have hypertension, angina, or heart failure, but it does not help to reduce the intracranial pressure (ICP).

Choice B Reason: This choice is correct because elevating the head of the bed to 30° may help to improve the venous drainage and decrease the ICP. ICP is the pressure exerted by the brain tissue, cerebrospinal fluid (CSF), and blood within the cranial cavity. A normal ICP range is 5 to 15 mm Hg, and an elevated ICP (>20 mm Hg) can cause cerebral ischemia, herniation, or death. Therefore, positioning the client in a semi-Fowler's position (30° angle) or high- Fowler's position (60° to 90° angle) can facilitate breathing and prevent further complications.

Choice C Reason: This choice is incorrect because applying a cold compress to the forehead may cause vasoconstriction and increase the ICP. A cold compress is a device that applies cold temperature to a body part to reduce inflammation, pain, or swelling. It may be used for clients who have headaches, sprains, or bruises, but it does not help to reduce the ICP.

Choice D Reason: This choice is incorrect because decreasing the oxygen flow rate may cause hypoxia and worsen the cerebral ischemia. Hypoxia is a condition in which the body or a part of it does not receive enough oxygen. It may cause symptoms such as confusion, agitation, or cyanosis. Therefore, providing adequate oxygenation and ventilation is essential to maintain the brain function and prevent further damage.