# A nurse is caring for a client receiving peritoneal dialysis who reports severe abdominal pain and has a cloudy dialysate return. The client's temperature is 101.2°F (38.4°C). What is the nurse's priority action?

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## 문제

A nurse is caring for a client receiving peritoneal dialysis who reports severe abdominal pain and has a cloudy dialysate return. The client's temperature is 101.2°F (38.4°C). What is the nurse's priority action?

## 보기

1. Increase the dwell time to improve clearance
2. Obtain dialysate sample for culture and sensitivity **✔ 정답**
3. Administer prescribed analgesic for pain relief
4. Flush the catheter with normal saline solution

**정답: 2**

## 해설

The combination of cloudy dialysate return, severe abdominal pain, and fever indicates peritonitis, a serious complication of peritoneal dialysis. Obtaining a dialysate sample for culture and sensitivity is the priority to identify the causative organism and guide appropriate antibiotic therapy.

This question assesses the nurse's ability to recognize and appropriately respond to peritonitis, one of the most serious complications of peritoneal dialysis. The presented clinical picture—cloudy dialysate drainage, severe abdominal pain, and fever (101.2°F/38.4°C)—represents the classic triad of peritonitis in peritoneal dialysis patients.

Peritonitis occurs when bacteria invade the peritoneal cavity, primarily through contamination during the dialysis exchange process or via catheter-related infection. The cloudy appearance of the dialysate is caused by an increased white blood cell count in response to infection, while the abdominal pain results from peritoneal inflammation. Fever indicates a systemic inflammatory response.

The priority nursing action is to collect a dialysate specimen for culture and sensitivity testing before initiating antibiotic therapy. This diagnostic step is crucial because it identifies the specific causative organism and determines antibiotic susceptibility patterns, enabling targeted treatment. Early identification and appropriate antibiotic selection significantly improve patient outcomes and reduce the risk of treatment failure or antibiotic resistance.

Prompt recognition and treatment of peritonitis are essential, as untreated or inadequately treated peritonitis can lead to serious complications such as sepsis, peritoneal damage, catheter removal, and transition to hemodialysis. Nurses must understand that while pain management is important, establishing a diagnosis through culture takes priority to ensure appropriate treatment and prevent complications.

## 심화 해설

Clinical Presentation and Initial Recognition

The client's presentation—severe abdominal pain, cloudy dialysate return, and a temperature of 101.2°F (38.4°C)—is the classic triad for peritoneal dialysis-associated peritonitis (PDAP). In the context of peritoneal dialysis (PD), the peritoneum acts as a semi-permeable membrane for solute and fluid exchange. When pathogenic microorganisms invade the normally sterile peritoneal cavity, an acute inflammatory response is triggered. This leads to an influx of leukocytes, fibrin, and inflammatory mediators into the dialysate, which clinically manifests as the observed cloudiness. The systemic response, driven by pyrogens released during the immune reaction, accounts for the elevated temperature. Recognizing this cluster of signs and symptoms rapidly is critical because delayed intervention is directly linked to increased morbidity, catheter loss, and mortality [1,2].

Rationale for the Priority Action

The nurse's priority action is to obtain a dialysate sample for culture and sensitivity. This step is the cornerstone of effective management and must precede any therapeutic intervention that could compromise diagnostic accuracy. The primary goal in PDAP is to identify the causative pathogen to guide targeted antibiotic therapy. Empiric broad-spectrum antibiotics are initiated promptly, but their success depends on eventual tailoring based on definitive culture results. Collecting the sample before administering antibiotics is essential to maximize the yield of microbial growth. The referenced studies underscore that traditional microbial culture, while the standard, has limitations in sensitivity and speed, with positivity rates sometimes failing to capture the causative organism [1,2]. This reality makes the proper collection of a pre-treatment sample even more vital, as any dilution or inhibition from prior antibiotic administration can render an already challenging diagnosis nearly impossible. Newer diagnostic methods like targeted next-generation sequencing (tNGS) and aptamer-based sensors are being developed to overcome these limitations, but culture remains the current clinical benchmark [1,3].

Analysis of Incorrect Options

- **Option 1: Increase the dwell time to improve clearance.** This action is inappropriate and potentially harmful. During active peritonitis, increasing dwell time can exacerbate abdominal pain and promote a greater inflammatory response. Standard practice during peritonitis often involves shorter, more frequent exchanges with lower fill volumes for patient comfort and to aid in the removal of inflammatory debris and bacteria. Clearance of solutes is not the immediate priority over infection control.

- **Option 3: Administer prescribed analgesic for pain relief.** While pain management is an important aspect of holistic nursing care, it is not the priority action in this scenario. The client's pain is a symptom of the underlying infection. Administering an analgesic before obtaining a diagnostic sample does not address the root cause and delays the definitive step that will guide a cure. Pain relief should follow the collection of cultures and the initiation of antibiotic therapy.

- **Option 4: Flush the catheter with normal saline solution.** Flushing a PD catheter in the context of suspected peritonitis is contraindicated. This action can dislodge a biofilm or fibrin clot that may be harboring the infectious organism, potentially pushing bacteria into the peritoneal cavity and worsening the infection or leading to systemic sepsis. Catheter patency issues are managed differently and are not the primary concern when clear signs of infection are present.

Connecting Pathophysiology to Clinical Practice

The underlying pathophysiology explains why culture collection is the non-negotiable first step. PDAP represents a state of immune dysregulation within the peritoneal cavity, where the host's inflammatory response can sometimes contribute to the difficulty in clearing the infection and the risk of relapse [2]. The infecting organisms, commonly gram-positive cocci like Staphylococcus aureus or gram-negative rods like Pseudomonas aeruginosa, can form biofilms on the catheter surface, making them resistant to both host defenses and antibiotics [3]. In rare cases, more fastidious organisms like Mycobacterium tuberculosis can be the cause, which would be completely missed without a proper culture and would not respond to standard empiric therapy . The nurse's role is to ensure that the diagnostic specimen is collected using strict aseptic technique before the first dose of antibiotic is administered, directly impacting the patient's trajectory from a generic empiric approach to a precise, pathogen-directed treatment plan.

References (research sources)

- [2]Immune dysregulation drives the relapse of peritoneal dialysis-associated peritonitis: a single-center prospective study.Research articleYang G, Hong X, Lai Z, Zhang H, Xiong Z, Xiong Z. (2026) · DOI: 10.3389/fimmu.2026.1810227

- [3]Design of a triplex fluorescence aptasensor for a culture-free diagnosis of peritoneal dialysis-related peritonitis.Research articleAltabban A, Rhouati A, Alhazmi AI, Cialla-May D, Popp J, Zourob M. (2026) · DOI: 10.1038/s41598-025-27637-y

## 임상 시나리오

Peritonitis in Peritoneal Dialysis: Priority ActionCulture Before Intervention
The classic triad of peritoneal dialysis-associated peritonitis (PDAP) is severe abdominal pain, cloudy dialysate, and fever (e.g., 101.2°F / 38.4°C). Cloudy fluid indicates an influx of leukocytes and fibrin.

The nurse's priority action is to obtain a dialysate sample for culture and sensitivity. This diagnostic step must be performed before administering antibiotics to accurately identify the causative pathogen and guide targeted therapy.

CautionDo not delay culturing to administer analgesics or flush the catheter. Collect the sample first, then initiate empiric antibiotics as prescribed. Delayed treatment increases the risk of catheter loss and mortality.

## 핵심 개념

- **Peritoneal Dialysis-Associated Peritonitis (PDAP)** — An infection of the peritoneal cavity in patients undergoing peritoneal dialysis, classically presenting with abdominal pain, cloudy dialysate, and fever.
- **Dialysate Culture and Sensitivity** — A diagnostic test where a sample of the dialysis fluid is analyzed to identify the specific microorganism causing an infection and determine which antibiotics will be effective against it.
- **Cloudy Dialysate** — A key sign of peritonitis caused by an increased number of white blood cells (leukocytes) and fibrin in the peritoneal fluid in response to infection.

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