# A nurse is assessing a 65-year-old patient with dilated cardiomyopathy. Which assessment finding would be most indicative of worsening heart failure in this patient?

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## 문제

A nurse is assessing a 65-year-old patient with dilated cardiomyopathy. Which assessment finding would be most indicative of worsening heart failure in this patient?

## 보기

1. Blood pressure of 140/90 mmHg
2. S3 gallop heart sound **✔ 정답**
3. Heart rate of 88 beats per minute
4. Ejection fraction of 45%

**정답: 2**

## 해설

S3 gallop is the most significant indicator of worsening heart failure in dilated cardiomyopathy, reflecting ventricular dysfunction and fluid overload. Other findings like mild hypertension or normal heart rate are less specific for acute decompensation.

## 심화 해설

Understanding Dilated Cardiomyopathy and Heart Failure Progression

When assessing a patient with dilated cardiomyopathy (DCM), the nurse must differentiate between stable chronic disease markers and findings that signal acute decompensation. DCM is characterized by ventricular dilation and systolic dysfunction, which reduces the heart's ability to pump blood effectively. As the condition worsens, compensatory mechanisms begin to fail, leading to increased ventricular filling pressures and volume overload. The clinical evaluation of congestion and perfusion is critical in identifying this deterioration, as recognized limitations exist in standard bedside assessments [2].

Analysis of Assessment Findings

The presence of an S3 gallop (option 2) is the most indicative finding of worsening heart failure in this scenario. An S3 heart sound is a low-frequency, early diastolic sound produced by the rapid passive filling of a non-compliant, volume-overloaded ventricle. In a 65-year-old patient with DCM, the development of an S3 gallop is a direct hemodynamic signal that the left ventricle is failing to handle the volume of blood returning to it. This correlates with elevated left ventricular end-diastolic pressure, a hallmark of acute decompensation. The prognostic value of such hemodynamic profiling is substantial, as ultrasound-based assessments of congestion and perfusion have gained increasing support for risk stratification in acute heart failure [2].

The other options represent findings that are either expected in chronic DCM or are not specific indicators of an acute worsening. A blood pressure of 140/90 mmHg (option 1) may be a compensatory response or a sign of comorbid hypertension but does not directly indicate a failing ventricle in the same way an S3 does. A heart rate of 88 beats per minute (option 3) is within a normal range and does not signal decompensation. An ejection fraction of 45% (option 4) is consistent with the diagnostic criteria for heart failure with mildly reduced ejection fraction (HFmrEF), which is defined as an EF of 41-49% [3]. While this confirms the presence of systolic dysfunction, it is a chronic structural measurement, not an acute clinical sign of worsening status. In fact, DCM is a leading cause of heart failure and can present with a wide range of ejection fractions, often sharing features with both reduced and preserved EF categories [3,4].References (research sources)

- [2]Integrated ultrasound haemodynamic profiling (VTI-VExUS) for risk stratification in acute heart failure.Research articleRuiz-Fuentes OI, Barron-Martinez A, Gonzalez-Macedo E, Viana-Rojas JA, Sierra-Gonzalez de Cossio A, Gopar-Nieto R, Arias-Mendoza MA, Sierra-Lara Martinez JD, Ortega-Hernández JA, Araiza-Garaygordobil D. (2026) · DOI: 10.1093/ehjimp/qyag012

- [3]Heart Failure With Mildly Reduced Ejection Fraction: A Heart Failure Society of America Scientific Statement.Research articleWilcox JE, Lund LH, Cox ZL, Ho JE, Lam CSP, Sharma K, Borlaug BA. (2026) · DOI: 10.1016/j.cardfail.2026.01.024

## 임상 시나리오

Decompensation in Dilated CardiomyopathyRecognizing the Hemodynamic Significance of an S3 Gallop
In dilated cardiomyopathy (DCM), the ventricle is chronically dilated with poor systolic squeeze. An S3 gallop is the most telling sign of acute-on-chronic failure, occurring during early diastole when rapid filling hits a non-compliant, volume-overloaded ventricle.

This sound directly correlates with elevated left ventricular end-diastolic pressure (LVEDP), typically exceeding 20 mmHg. It signals that compensatory mechanisms are exhausted and the heart cannot handle venous return, marking a transition from stable chronic disease to acute decompensation.

CautionDo not rely on a stable ejection fraction or normal vital signs to rule out worsening failure. An S3 gallop is a late and ominous finding in adults over 40; its new development requires immediate intervention, often with diuretics and afterload reduction, to prevent pulmonary edema.

## 핵심 개념

- **S3 Gallop** — A low-frequency early diastolic heart sound caused by rapid passive ventricular filling into a non-compliant, volume-overloaded ventricle.
- **Dilated Cardiomyopathy (DCM)** — A condition characterized by ventricular dilation and impaired systolic function, reducing the heart's pumping effectiveness.
- **Left Ventricular End-Diastolic Pressure (LVEDP)** — The pressure in the left ventricle at the end of diastole; elevated LVEDP is a hallmark of volume overload and decompensated heart failure.

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