Which nursing measure is appropriate to prevent thrombophlebitis in the recovery period after a cesarean birth?

Question

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Leg exercises and passive range of motion promote venous blood flow and prevent venous stasis while the patient is still on bed rest.The blanket behind the knees will cause pressure and decrease venous blood flow.Limiting oral intake will produce hemoconcentration,which may lead to thrombophlebitis.The patient may not have full return of leg movements,and ambulating is contraindicated until she has full motion and sensation.

Which Nursing Measure Is Appropriate to Prevent Thrombophlebitis in the Recovery