# A nurse is evaluating a 65-year-old patient with chronic obstructive pulmonary disease (COPD) during a clinic visit. Which finding would indicate normal respiratory function for this patient?

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## 문제

A nurse is evaluating a 65-year-old patient with chronic obstructive pulmonary disease (COPD) during a clinic visit. Which finding would indicate normal respiratory function for this patient?

## 보기

1. Respiratory rate of 28 breaths per minute at rest
2. Use of accessory muscles during quiet breathing
3. Bilateral chest expansion with symmetrical rise and fall **✔ 정답**
4. Presence of adventitious breath sounds on auscultation

**정답: 3**

## 해설

Bilateral symmetrical chest expansion indicates normal respiratory function, reflecting proper lung ventilation. Other findings (tachypnea, accessory muscle use, adventitious sounds) suggest respiratory distress or pathology.

## 심화 해설

Understanding Normal Respiratory Function in COPD

When evaluating a patient with chronic obstructive pulmonary disease (COPD), it is essential to distinguish between the expected chronic adaptations of their disease and findings that signal acute decompensation or abnormality. The question asks for a finding that indicates normal respiratory function for this specific patient, which means a baseline, non-distressed state consistent with their chronic condition.

Analysis of the Correct Answer

The correct finding is bilateral chest expansion with a symmetrical rise and fall. This finding indicates that the thoracic cage is moving normally and that both lungs are expanding equally during inspiration. In a patient with COPD, even though the lungs are hyperinflated and the mechanics of breathing are altered, the fundamental expectation is that the chest wall movement remains symmetrical. Asymmetrical chest expansion would suggest a complication such as a pneumothorax, pleural effusion, or unilateral mucus plugging causing atelectasis. The presence of symmetrical movement confirms that, at this moment, there is no gross mechanical barrier to ventilation on either side. This concept aligns with the importance of monitoring ventilatory distribution, as highlighted in research using electrical impedance tomography to assess right versus left lung ventilation in patients with compromised respiratory mechanics .

Analysis of Incorrect Answers

Option 1: A respiratory rate of 28 breaths per minute at rest. A normal resting respiratory rate for an adult is typically 12 to 20 breaths per minute. A rate of 28 indicates tachypnea, which is a critical sign of respiratory distress, anxiety, pain, or an acute exacerbation of COPD. The validation of accurate respiratory rate monitoring is crucial because deviations from the normal range are early and sensitive indicators of clinical deterioration . A rate this elevated at rest is never a normal finding and requires immediate investigation.

Option 2: Use of accessory muscles during quiet breathing. The use of accessory muscles, such as the sternocleidomastoid and scalene muscles, is a compensatory mechanism to increase thoracic volume when the primary muscles of respiration (the diaphragm and intercostals) are ineffective. In a patient with COPD, this is a sign of increased work of breathing and is commonly observed during an acute exacerbation. During quiet, resting breathing in a stable state, a patient should not need to recruit these muscles. This finding signals respiratory distress, not normal function.

Option 4: Presence of adventitious breath sounds on auscultation. Adventitious breath sounds are abnormal sounds superimposed on normal breath sounds. They include wheezes (often heard in COPD due to narrowed airways), crackles (which can indicate fluid or atelectasis), and rhonchi (suggestive of secretions in large airways). While a patient with stable COPD may have diminished breath sounds or a prolonged expiratory phase, the presence of new or significant adventitious sounds is an abnormal finding that indicates a pathological process, such as bronchospasm or retained secretions. A normal respiratory assessment for a stable COPD patient would not be defined by the presence of these abnormal sounds.

Clinical Integration for the NCLEX-RN

This question tests the ability to differentiate between the expected chronic state of a disease and an acute change. The diagnostic challenges in elderly COPD patients are significant, as age-related physiological changes and multimorbidity can mask or mimic symptoms . A key nursing responsibility is to perform a focused respiratory assessment and recognize that findings like tachypnea, accessory muscle use, and adventitious sounds are indicators of instability. The goal of ongoing monitoring, including the assessment of dynamic pulmonary function, is to detect these changes early, as they have a direct impact on a patient's quality of life and can predict clinical deterioration . The only option that reflects a stable, non-distressed state is the symmetrical expansion of the chest.

## 임상 시나리오

COPD Baseline AssessmentDifferentiating Normal Adaptation from Acute Distress
In a stable COPD patient, the expected finding is symmetrical chest expansion. This confirms no acute mechanical barrier like pneumothorax or major atelectasis, even with altered lung mechanics.

A resting respiratory rate should be 12-20 breaths/min. A rate of 28/min indicates tachypnea, a sign of decompensation.

CautionDo not mistake common COPD findings like diminished breath sounds or a barrel chest for "normal." Accessory muscle use at rest or new adventitious sounds always signal increased work of breathing requiring immediate evaluation.

## 핵심 개념

- **Tachypnea** — Tachypnea. In adults, it refers to a respiratory rate of 20 or more breaths per minute. It is not synonymous with dyspnea; the respiratory rate may be fast, but the depth of breathing can be shallow.
- **Accessory Muscles of Respiration** — Accessory respiratory muscles. They mainly act during inhalation and include the sternocleidomastoid, scalene, and pectoralis muscles. Activation of these muscles at rest is abnormal and indicates increased work of breathing.
- **Symmetrical Chest Expansion** — Symmetrical chest expansion. Both sides of the chest wall expand equally during inhalation. This is a normal finding indicating adequate ventilation of both lungs, no air or fluid in the pleural cavity, and no restriction of chest wall movement.
- **Adventitious Breath Sounds** — Additional breath sounds. Abnormal sounds heard in addition to normal breath sounds. These include wheezes, crackles (rales), and pleural friction rub, each suggesting different airway or lung parenchyma pathologies.
- **Dyspnea** — Shortness of breath. A subjective symptom where breathing feels uncomfortable or difficult. Objective signs may include use of accessory respiratory muscles, nasal flaring, and rapid or irregular breathing.

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