# The patient's heart demonstrates ______ sounds, with a loud S3 followed immediately by S4, indicating severe heart failure.

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=168411  
> language: ko  
> subject: Diseases of the circulatory system

## 문제

The patient's heart demonstrates ______ sounds, with a loud S3 followed immediately by S4, indicating severe heart failure.

## 보기

1. summation **✔ 정답**
2. galloping
3. splitting
4. quadruple
5. merged

**정답: 1**

## 해설

Summation gallop occurs when S3 and S4 heart sounds occur so close together that they merge into a single sound. This finding indicates severe diastolic dysfunction and is often heard in patients with advanced heart failure.

## 임상 시나리오

Heart Sounds Key Points:

1. Normal Heart Sounds
- S1: Closure of mitral and tricuspid valves
- S2: Closure of aortic and pulmonic valves

2. Extra Heart Sounds
- S3: Early diastolic sound
- S4: Late diastolic sound

3. Summation Gallop
- Fusion of S3 and S4
- Occurs in severe heart failure
- Indicates poor ventricular compliance
- Associated with diastolic dysfunction

4. Clinical Significance
- S3: Ventricular volume overload
- S4: Ventricular pressure overload
- Summation: Combined systolic/diastolic dysfunction

5. Auscultation Characteristics
- Best heard at apex
- Low-pitched sounds
- Increased intensity with left lateral position
- Timing: During diastolic phase

## 핵심 개념

- **summation** — A condition where S3 and S4 heart sounds occur so close together that they merge into a single sound, indicating severe diastolic dysfunction
- **galloping** — A type of abnormal heart rhythm characterized by three or four heart sounds that resemble the sound of a galloping horse
- **splitting** — A condition where normal heart sounds (S1 or S2) are divided into two distinct components due to slight timing differences
- **quadruple** — The presence of four distinct heart sounds in one cardiac cycle, typically including S1, S2, S3, and S4
- **merged** — The combination of two or more heart sounds into a single sound, often referring to the fusion of different components of heart sounds

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