A nurse is caring for a postpartum client who is experiencing subinvolution of the uterus. Which nursing intervention should be the priority?

Subinvolution is failure of uterine involution post-delivery. Priority intervention is assessing fundal height and performing massage to stimulate contractions and control bleeding, addressing the immediate physiological need. Other options (antibiotics, surgery, increased fluids) are not initial priorities.

Understanding Subinvolution and the Priority Nursing Action

Subinvolution of the uterus is a postpartum complication where the uterus fails to return to its pre-pregnancy size and consistency at the expected rate. Normally, the uterine fundus descends approximately one fingerbreadth (1 cm) per day. With subinvolution, this process is delayed or arrested. The most common causes are retained placental fragments and uterine infection (endometritis). The immediate clinical concern is that a boggy, enlarged uterus cannot effectively compress the open vessels at the former placental site, which significantly increases the risk of a delayed postpartum hemorrhage (PPH).

The priority nursing intervention is to assess fundal height and perform fundal massage. This action directly addresses the immediate physiological risk. The assessment component involves checking the position and consistency of the uterine fundus. A fundus that is higher than expected for the number of postpartum hours or days, and one that feels soft or "boggy" upon palpation, is a classic sign of subinvolution. The intervention component, fundal massage, provides direct mechanical stimulation. This stimulation promotes uterine muscle contraction, which compresses the bleeding vessels, helps expel any small clots, and is the first-line measure to control active bleeding. According to the S2k guideline on peripartum hemorrhage, the initial management of postpartum bleeding focuses on mechanical and pharmacological measures to achieve uterine contraction ^[2]. A Cochrane review on prophylactic interventions after placental delivery also emphasizes the role of uterotonic agents and mechanical measures in preventing excessive bleeding in the postnatal period ^[1]. While that review focuses on prophylaxis, the same physiological principle—stimulating uterine contraction to control hemorrhage—applies directly to the treatment of subinvolution with a boggy uterus.

The other options are not the priority. Administering prescribed antibiotics is an important intervention if the underlying cause of subinvolution is an infection, as maternal sepsis is a serious condition requiring timely treatment ^[3]. However, antibiotic therapy does not address the immediate, life-threatening risk of hemorrhage from an atonic uterus. Preparing the client for surgical intervention, such as a dilation and curettage (D&C) for retained placental fragments, is a secondary step if fundal massage and uterotonic medications fail to control bleeding or if a specific retained mass is identified. Increasing oral fluid intake supports overall hydration and recovery but has no direct or immediate effect on uterine muscle tone or the control of a potential hemorrhage. Therefore, the hands-on assessment and mechanical intervention of fundal massage is the first and most critical step the nurse must take.