# Situation: A 34-year-old man is admitted with newly diagnosed acute myeloid leukemia (AML). His white blood cell count is 45,000/mm³ with 70% blasts, his hemoglobin is 8.2 g/dL (82 g/L), and his platelet count is 15,000/mm³. Induction chemotherapy is planned. Five days into induction, a platelet transfusion has raised his platelet count to 62,000/mm³. His white blood cell count is 1,500/mm³ with 15% segmented neutrophils and 5% bands. He asks for the bisacodyl suppository that is ordered as needed for constipation. Which response is correct?

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> subject: Nursing Practice III — Care of Clients with Problems in Surgery, Oxygenation, Fluid and Electrolytes, Infectious, Inflammatory and Immunologic Response, Cellular Aberrations

## 문제

Situation: A 34-year-old man is admitted with newly diagnosed acute myeloid leukemia (AML). His white blood cell count is 45,000/mm³ with 70% blasts, his hemoglobin is 8.2 g/dL (82 g/L), and his platelet count is 15,000/mm³. Induction chemotherapy is planned.

Five days into induction, a platelet transfusion has raised his platelet count to 62,000/mm³. His white blood cell count is 1,500/mm³ with 15% segmented neutrophils and 5% bands. He asks for the bisacodyl suppository that is ordered as needed for constipation. Which response is correct?

## 보기

1. Withhold it and clarify; his neutrophil count is 300/mm³ **✔ 정답**
2. Give it; his neutrophil count is 1,500/mm³
3. Give it; his platelet count is now above 50,000/mm³
4. Withhold it and clarify; his neutrophil count is 1,200/mm³

**정답: 1**

## 해설

The absolute neutrophil count is 1,500 × (15 + 5) ÷ 100 = 300/mm³, which is severe neutropenia. Suppositories, enemas, and rectal temperatures are avoided in neutropenia because rectal trauma can let bacteria into the blood, so the nurse withholds the suppository and asks for an oral laxative. The transfused platelet count does not remove this infection risk.

## 심화 해설

Clinical situation The patient is receiving induction chemotherapy for newly diagnosed AML. On day 5, the WBC count is 1,500/mm³ with 15% segmented neutrophils and 5% bands. The key calculation is the absolute neutrophil count (ANC), which determines the actual number of circulating neutrophils available to fight infection.

ANC = total WBC × (segmented neutrophils % + bands %) ÷ 100. Here, 1,500 × (15 + 5) ÷ 100 = 300/mm³. An ANC below 500/mm³ defines severe neutropenia, and this patient is at 300/mm³ — placing him at high risk for bacterial translocation and bloodstream infection.

Key point! The WBC of 1,500/mm³ is misleading because most of those cells are not functional neutrophils. The ANC, not the total WBC, is the clinical decision-making number.

Why the suppository is withheld Rectal manipulation — including suppositories, enemas, and rectal thermometers — is avoided in severe neutropenia because mucosal trauma creates a portal of entry for enteric bacteria into the bloodstream. In a patient with an ANC of 300/mm³, the normal mucosal barrier of the rectum is the only defense left, and even a small abrasion from a bisacodyl suppository can precipitate bacteremia.

The platelet count of 62,000/mm³ after transfusion is above the typical threshold of 50,000/mm³ for invasive rectal procedures, but Watch out! the platelet count only addresses bleeding risk. It does not reduce the infection risk from mucosal trauma in a severely neutropenic patient. The two risks — bleeding and infection — are managed by different parameters.

Clinical reasoning for the correct response The nurse should withhold the bisacodyl suppository and clarify with the prescriber to obtain an alternative that does not breach the rectal mucosa. An oral osmotic or stimulant laxative, such as polyethylene glycol or lactulose, is the safer choice for constipation management during neutropenia.

The incorrect options all reflect a misunderstanding of which value matters. Option 2 uses the total WBC of 1,500/mm³ instead of the ANC. Option 4 miscalculates the ANC as 1,200/mm³ — this would require adding only the segmented neutrophils and ignoring bands, or using an incorrect denominator. Option 3 focuses on the platelet count, which is not the limiting factor here.

| Parameter | Value | Clinical significance |
| --- | --- | --- |
| Total WBC | 1,500/mm³ | Not useful alone; includes blasts and non-functional cells |
| Segmented neutrophils | 15% | Mature neutrophils |
| Bands | 5% | Immature neutrophils; included in ANC because they can fight infection |
| ANC | 300/mm³ | Severe neutropenia; rectal procedures contraindicated |
| Platelet count | 62,000/mm³ | Adequate for hemostasis but does not reduce infection risk |

Pathophysiology link to induction therapy Induction chemotherapy for AML causes profound myelosuppression, including neutropenia. The nadir typically occurs 7–14 days after chemotherapy begins, so a day-5 ANC of 300/mm³ is expected and will likely fall further. During this vulnerable window, the gastrointestinal tract is a major source of endogenous bacteria, particularly gram-negative organisms and anaerobes that colonize the lower bowel. Any disruption of the rectal mucosa allows these organisms direct access to the bloodstream in a host with almost no circulating neutrophils to contain the invasion.

Key point! Neutropenic precautions are not limited to diet and hand hygiene. They extend to avoiding any procedure that can create a mucosal break — including rectal suppositories, enemas, rectal temperatures, and even digital rectal examinations unless absolutely necessary and ordered by the oncology team.

The supportive care principle is to minimize all avoidable portals of entry for infection during the neutropenic nadir. When constipation requires intervention, oral agents are preferred first-line, and the nurse should communicate the ANC-based rationale when clarifying the order.

## 임상 시나리오

Rectal Precautions in Severe NeutropeniaWhy the ANC, not WBC or platelets, drives the decision
Calculate the absolute neutrophil count (ANC): total WBC × (segs% + bands%) / 100. Here, 1,500 × 20% = 300/mm³, which is severe neutropenia (ANC < 500/mm³).

In severe neutropenia, avoid rectal manipulation — suppositories, enemas, rectal thermometers — because mucosal trauma creates a portal for enteric bacteria to enter the bloodstream.

CautionA platelet count above 50,000/mm³ only reduces bleeding risk; it does not reduce the infection risk from mucosal trauma in a neutropenic patient. Withhold the suppository and request an oral laxative.

## 핵심 개념

- **Absolute Neutrophil Count (ANC)** — Total WBC × (segs% + bands%) / 100; values below 500/mm³ indicate severe neutropenia and high infection risk.
- **Severe Neutropenia** — ANC < 500/mm³; functional neutrophils are critically low, making mucosal barriers the main defense against bacterial translocation.
- **Rectal Precautions** — Avoidance of suppositories, enemas, and rectal temperatures in neutropenic patients to prevent mucosal trauma and bacteremia.

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