# Situation: A 30-year-old man with schizophrenia has had persistent hallucinations despite antipsychotic treatment taken as prescribed. His psychiatrist starts clozapine. His baseline absolute neutrophil count (ANC) was 1.2 × 10⁹/L, and hematology has confirmed benign ethnic neutropenia. He smokes about 20 cigarettes a day. At a follow-up visit in week 4, he reports the findings below. Which one should the nurse report to the prescriber right away?

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=630108  
> language: ko  
> subject: Nursing Practice V — Care of Clients with Maladaptive Patterns of Behavior; Care of Clients with Life-Threatening Conditions, Acute Multi-Organ Problems, High Acuity and Emergency Situations

## 문제

Situation: A 30-year-old man with schizophrenia has had persistent hallucinations despite antipsychotic treatment taken as prescribed. His psychiatrist starts clozapine. His baseline absolute neutrophil count (ANC) was 1.2 × 10⁹/L, and hematology has confirmed benign ethnic neutropenia. He smokes about 20 cigarettes a day.

At a follow-up visit in week 4, he reports the findings below. Which one should the nurse report to the prescriber right away?

## 보기

1. Waking most nights with a wet pillow from drooling
2. Hard stools every other day and a soft, nontender abdomen
3. A weight gain of 1.5 kg since starting clozapine
4. Pulse 118/min and breathless on one flight of stairs **✔ 정답**

**정답: 4**

## 해설

Myocarditis and cardiomyopathy occur mostly in the first 2 months of clozapine; tachycardia with dyspnea, chest pain, or fever is reported at once so that troponin and C-reactive protein can be checked. Drooling, gradual weight gain, and constipation without a long gap or abdominal pain are handled at routine visits.

## 심화 해설

Clinical context Clozapine is reserved for treatment-resistant schizophrenia because it is uniquely effective, but it carries rare, time-sensitive risks. In the first 2 months after initiation, the priority concern is clozapine-associated myocarditis. The nurse must recognize that tachycardia plus dyspnea, chest pain, or fever is a red-flag presentation requiring immediate prescriber notification and laboratory evaluation with troponin and C-reactive protein (CRP).

Why option 4 is the priority A resting pulse of 118/min with breathlessness on one flight of stairs signals possible cardiac inflammation or early heart failure. Myocarditis and cardiomyopathy occur mostly in the first 2 months of clozapine treatment, and tachycardia with dyspnea is reported at once so that troponin and CRP can be checked. In the case report by Roomiany et al., a man in his 30s developed fever and palpitations three weeks after starting clozapine, with a marked CRP elevation that preceded cardiac biomarker elevation and new left ventricular systolic dysfunction [1]. This illustrates that inflammatory markers may rise before troponin, so a high index of suspicion is essential even when the patient looks only mildly unwell.

Why the other options are less urgent Sialorrhea (drooling) is a common, bothersome but non–life-threatening clozapine adverse effect. It often causes nocturnal pillow wetting and is managed at routine visits with dose timing, anticholinergic measures, or other supportive strategies. Constipation is also frequent, but hard stools every other day with a soft, nontender abdomen and no prolonged gap indicates a mild, non-obstructive pattern. It becomes urgent only when accompanied by abdominal pain, distention, vomiting, or a prolonged absence of bowel movements, which can herald ileus or bowel ischemia. Gradual weight gain of 1.5 kg over four weeks reflects the metabolic burden of clozapine and warrants routine monitoring, but it does not require same-day prescriber contact.

| Finding | Timing of concern | Nursing action |
| --- | --- | --- |
| Tachycardia with dyspnea, chest pain, or fever | First 2 months (myocarditis window) | Report immediately; obtain troponin and CRP |
| Nocturnal drooling | Any time, usually persistent | Routine visit; supportive management |
| Constipation without abdominal pain or long gap | Any time, common | Routine visit; bowel regimen |
| Gradual weight gain | Weeks to months | Routine monitoring; metabolic counseling |

Pathophysiology and clinical reasoning Clozapine-associated myocarditis is thought to involve an IgE-mediated hypersensitivity reaction rather than direct myocyte toxicity. The inflammatory cascade can produce fever, tachycardia, and elevated CRP before troponin rises or echocardiography shows reduced ejection fraction [1]. A systematic review of 119 studies emphasizes that nonspecific biomarkers and symptom overlap with clozapine-induced pneumonia make diagnosis challenging, and that a structured diagnostic algorithm improves early recognition . For the nurse, this means any new tachycardia with dyspnea in the first 2 months is treated as myocarditis until proven otherwise.

Key point! Tachycardia alone is common with clozapine, but tachycardia plus dyspnea, chest pain, or fever changes the clinical picture from benign to potentially life-threatening. Watch out! CRP may rise before troponin, so a normal troponin at first draw does not rule out evolving myocarditis. Key point! The patient’s baseline benign ethnic neutropenia with ANC 1.2 × 10⁹/L is a hematologic consideration for monitoring, but it does not alter the immediate cardiac priority in this scenario. Smoking 20 cigarettes/day induces clozapine metabolism and may require dose adjustment, but it is not the acute concern here.References (research sources)

- [1]Clozapine-Associated Myocarditis Presenting With Acute Heart Failure: Inflammation Before Injury.Research articleRoomiany P, Eshraghi A, Farber F. (2026) · DOI: 10.7759/cureus.105736

## 임상 시나리오

Clozapine Initiation: Cardiac Red FlagsEarly recognition of myocarditis in the first 2 months
The highest-priority adverse effect after starting clozapine is myocarditis, which occurs mostly in the first 2 months. Report tachycardia with dyspnea, chest pain, or fever immediately for troponin and CRP testing.

A resting pulse of 118/min with breathlessness on one flight of stairs suggests possible cardiac inflammation or early heart failure. CRP may rise before troponin, so maintain a high index of suspicion even when the patient looks only mildly unwell.

CautionDo not dismiss persistent tachycardia as anxiety. In the first 2 months of clozapine, any combination of tachycardia with dyspnea, chest pain, or fever requires same-day prescriber notification and cardiac workup.

## 핵심 개념

- **Clozapine-associated myocarditis** — Rare, time-sensitive cardiac inflammation occurring mostly in the first 2 months of clozapine treatment; presents with tachycardia, dyspnea, chest pain, or fever.
- **Troponin** — Cardiac biomarker used to evaluate suspected myocarditis or myocardial injury.
- **C-reactive protein (CRP)** — Inflammatory marker that may rise before troponin in clozapine-associated myocarditis.
- **Sialorrhea** — Excessive drooling, a common non-life-threatening adverse effect of clozapine.
- **Benign ethnic neutropenia** — A normal variant of lower ANC in certain ethnic groups that does not preclude clozapine use with appropriate monitoring.

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