Following morning care, a client with a C-5 spinal cord injury who is sitting in a wheelchair becomes flushed and complains of a headache. Which intervention should the nurse implementfirst?

Administer a prescribed PRN dose of hydralazine.

Assess the client's blood pressures every 15 minutes.

Teach the client to recognize the symptoms of dysreflexia.

Relieve any kinks or obstruction in the client's Foley tubing.