Final answer:
To lessen the symptoms of a tet spell in a child with tetralogy of Fallot, placing the child in a knee-to-chest position and providing oxygen can be helpful. Medications like morphine or propranolol may also be used.
Step-by-step explanation:
A tet spell, also known as a hypercyanotic episode, is a sudden worsening of symptoms in a child with tetralogy of Fallot. During a tet spell, oxygen levels in the blood drop and the child becomes cyanotic or bluish in color. To lessen the symptoms of a tet spell, the child should be placed in a knee-to-chest position. This helps improve blood flow to the lungs and increases oxygen levels in the blood. Additionally, giving oxygen, providing calm and comforting environment, and giving medications like morphine or propranolol may also help alleviate the symptoms.