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NDHCE practice questions

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Question 1Professional Responsibilities and Ethical/Legal Practice

Which legal doctrine allows a dental hygienist to perform certain clinical procedures under a dentist's supervision without holding a separate license for each procedure?

  1. Statute of limitations
  2. Informed consent doctrine
  3. Scope of practice statutes Correct answer.
  4. Respondeat superior

Explanation

State dental practice acts define the scope of practice for hygienists and specify which procedures may be performed and under what level of supervision. These statutes, not general tort doctrines, establish the legal boundaries of clinical activity.

Question 2Professional Responsibilities and Ethical/Legal Practice

A patient asks a hygienist to explain the risks of a proposed periodontal surgery. What is the most appropriate response?

  1. Decline to speak and leave the room
  2. Provide the explanation and obtain the patient's signature
  3. Refer the consent discussion to the treating dentist Correct answer.
  4. Give general information and note that no risks exist

Explanation

Obtaining informed consent for a surgical procedure is the responsibility of the clinician performing it, who has the training and knowledge to disclose material risks. The hygienist may support patient understanding but should not conduct the formal consent discussion for the dentist's procedure.

Question 3Professional Responsibilities and Ethical/Legal Practice

What is the primary purpose of documenting clinical findings and treatment in the patient record?

  1. To increase reimbursement amounts
  2. To replace verbal patient communication
  3. To satisfy insurance marketing rules
  4. To create a contemporaneous legal record of care Correct answer.

Explanation

The patient record serves as the contemporaneous legal account of assessment, care delivered, and patient responses, and it may be used to defend or evaluate care. Accurate, timely entries protect both the patient and the clinician.

Question 4Professional Responsibilities and Ethical/Legal Practice

A hygienist suspects that a child has been physically abused. What is the appropriate action?

  1. Confront the parent and demand an explanation
  2. Wait for conclusive photographic proof before acting
  3. Discuss the suspicion only with coworkers
  4. Report the suspicion to the designated child protective agency Correct answer.

Explanation

Health care professionals are generally mandated reporters who must notify the appropriate child protective authority when abuse or neglect is reasonably suspected. Reporting is based on reasonable suspicion, not proof, and the clinician does not need to investigate.

Question 5Professional Responsibilities and Ethical/Legal Practice

Which action best protects patient confidentiality when a hygienist discusses a case in a clinical staff meeting?

  1. Using the patient's full name for clarity
  2. Posting the case details on a private social media group
  3. Leaving printed radiographs on a reception counter
  4. Sharing only information necessary for care among involved staff Correct answer.

Explanation

Confidentiality permits disclosure of protected health information only to those involved in the patient's care and only to the extent needed. Limiting discussion to necessary information among treating team members satisfies this principle.

Question 6Professional Responsibilities and Ethical/Legal Practice

A hygienist who observes a colleague practicing while visibly impaired by alcohol has what professional obligation?

  1. Quietly cover the colleague's patients
  2. Discuss it only after the shift ends
  3. Ignore it to avoid conflict
  4. Report it through the appropriate supervisory or regulatory channel Correct answer.

Explanation

Professionals have an ethical and often legal duty to protect patients from impaired practice by reporting concerns to a supervisor or regulatory authority. Failing to act places patients at risk and may itself constitute misconduct.

Question 7Professional Responsibilities and Ethical/Legal Practice

A patient refuses a recommended radiographic examination after the risks and benefits are explained. How should the hygienist proceed?

  1. Discharge the patient permanently without notice
  2. Document the refusal and continue with agreed services Correct answer.
  3. Obtain radiographs without telling the patient
  4. Refuse to provide any further care

Explanation

A competent patient may refuse any recommended treatment, and the clinician should respect that decision while documenting the discussion and the refusal. Care that the patient has agreed to can continue, and the refusal should be recorded.

Question 8Professional Responsibilities and Ethical/Legal Practice

Which situation most clearly requires a new authorization before releasing a patient's protected health information?

  1. Sharing records with a marketing company for a mailing Correct answer.
  2. Continuing treatment by the same care team
  3. Sending a claim to the patient's insurer for payment
  4. Reporting a gunshot wound as required by law

Explanation

Uses and disclosures for treatment, payment, and certain legally required reports do not require separate patient authorization. Disclosing records for marketing purposes generally requires a specific written authorization.

Question 9Professional Responsibilities and Ethical/Legal Practice

A hygienist moves to another state and plans to continue practicing clinically. What must the hygienist do first?

  1. Begin work and apply for licensure later
  2. Assume the prior license transfers automatically
  3. Obtain licensure or authorization from the new state board Correct answer.
  4. Practice only on weekends until licensed

Explanation

Licensure is granted by each state board, and practicing without valid authorization in the new jurisdiction is unlicensed practice. The hygienist must apply for licensure or other lawful authorization before delivering care.

Question 10Professional Responsibilities and Ethical/Legal Practice

During a procedure, a hygienist makes an error that causes minor harm to a patient. What is the most appropriate professional response?

  1. Ask a coworker to document the event instead
  2. Say nothing unless the patient asks
  3. Disclose the error to the patient and document it Correct answer.
  4. Alter the record to avoid blame

Explanation

Ethical practice requires honesty with the patient about errors that affect their care, along with accurate documentation and follow-up. Concealment or record alteration violates professional and legal standards.

Question 11Professional Responsibilities and Ethical/Legal Practice

Which element is essential for a valid malpractice claim against a dental hygienist?

  1. The patient disliked the clinician's manner
  2. A duty was owed and breached, causing harm Correct answer.
  3. The patient paid for the service
  4. The clinician had many years of experience

Explanation

Negligence requires a professional duty to the patient, a breach of the standard of care, causation, and actual damages. All four elements must be established for a malpractice claim to succeed.

Question 12Professional Responsibilities and Ethical/Legal Practice

A patient offers a hygienist a large cash gift in exchange for skipping required sterilization steps between patients. What is the best response?

  1. Refer the patient to another office without explanation
  2. Accept the gift and shorten the process slightly
  3. Decline and follow established infection control protocols Correct answer.
  4. Accept the gift and document the shortcut

Explanation

Infection control standards exist to protect all patients and cannot be negotiated for personal benefit. Accepting payment to deviate from required protocols would be unethical and unsafe.

Question 13Professional Responsibilities and Ethical/Legal Practice

Which behavior best demonstrates the ethical principle of veracity in clinical practice?

  1. Recording findings that were assumed rather than observed
  2. Telling the patient honestly what is known and unknown about the condition Correct answer.
  3. Overstating the benefits of a procedure to gain consent
  4. Withholding a diagnosis to avoid upsetting the patient

Explanation

Veracity is the duty to tell the truth, which requires honest communication about findings, prognosis, and uncertainty. Misrepresenting benefits or fabricating findings violates this principle.

Question 14Professional Responsibilities and Ethical/Legal Practice

A hygienist is asked to perform a procedure that is outside the legally permitted scope of practice for hygienists in that state. What is the appropriate action?

  1. Ask an unlicensed assistant to perform it
  2. Decline and explain the legal scope limitation Correct answer.
  3. Perform it and note it as an exception
  4. Perform it because the dentist requested it

Explanation

A dentist's request cannot expand the legal scope of practice defined by statute. The hygienist must decline and clarify the limitation, because performing outside scope exposes patients and the clinician to legal risk.

Question 15Professional Responsibilities and Ethical/Legal Practice

Which action best reflects the principle of justice in allocating limited clinic resources?

  1. Giving priority to patients who pay more
  2. Applying consistent, need-based criteria to all patients Correct answer.
  3. Scheduling friends ahead of others
  4. Offering faster care to patients who complain most

Explanation

Justice requires fair and consistent treatment of patients using transparent, need-based criteria rather than favoritism or financial leverage. Applying the same standards to everyone supports equitable care.

Question 16Professional Responsibilities and Ethical/Legal Practice

A patient record contains an entry that a hygienist believes is incorrect. What is the proper way to correct it?

  1. Remove the page and rewrite the entire record
  2. Write over the original text with correction fluid
  3. Add a dated correction or addendum without deleting the original Correct answer.
  4. Erase the original entry completely

Explanation

Records should be corrected by adding a dated, signed addendum or a single line through the error with an initial, preserving the original entry. Deleting or obscuring entries destroys the record's integrity and may appear fraudulent.

Question 17Professional Responsibilities and Ethical/Legal Practice

A hygienist posts a photo of a patient's distinctive smile on a personal social media account without consent. Which principle is most directly violated?

  1. Veracity
  2. Beneficence
  3. Patient privacy and confidentiality Correct answer.
  4. Nonmaleficence

Explanation

Sharing identifiable patient images without authorization is a breach of privacy and confidentiality, which are protected by law and professional ethics. Even images without a name may be identifiable and require consent.

Question 18Professional Responsibilities and Ethical/Legal Practice

A patient with limited English proficiency must consent to a procedure. What is the most appropriate way to support valid informed consent?

  1. Rely on a family member to summarize the discussion
  2. Obtain a signature without any explanation
  3. Proceed with consent in English and assume understanding
  4. Use a qualified interpreter and translated materials Correct answer.

Explanation

Valid informed consent requires that the patient understand the information, which depends on communication in a language the patient comprehends. Qualified interpreters and translated materials support comprehension and reduce error.

Question 19Professional Responsibilities and Ethical/Legal Practice

A hygienist receives a subpoena for a patient's records in a legal case. What is the most prudent first step?

  1. Immediately mail the complete record to the requesting attorney
  2. Release only the portions that seem relevant without review
  3. Verify the subpoena's validity and follow legal or institutional guidance before releasing records Correct answer.
  4. Ignore the subpoena entirely

Explanation

A subpoena may require a response, but the clinician should confirm its validity and consult institutional policy or legal counsel before disclosing protected information. Releasing records improperly can violate privacy law, while ignoring a valid subpoena can carry legal consequences.

Question 20Professional Responsibilities and Ethical/Legal Practice

A hygienist disagrees with a dentist's treatment plan that the hygienist believes is not in the patient's best interest. What is the most appropriate professional action?

  1. Refuse to speak to the dentist and stop treating the patient
  2. Discuss the concern privately with the dentist and advocate for the patient through proper channels Correct answer.
  3. Alter the treatment plan without informing anyone
  4. Quietly undermine the plan in front of the patient

Explanation

Ethical practice supports respectful, private communication among colleagues and advocacy for the patient through appropriate channels. Undermining a colleague publicly or unilaterally changing the plan disrupts care and breaches professional conduct.

Question 21Health Promotion and Disease Prevention

Which vaccine is recommended annually for health care personnel primarily to reduce transmission to high-risk patients?

  1. Tetanus-diphtheria booster
  2. Measles-mumps-rubella vaccine
  3. Hepatitis B vaccine
  4. Influenza vaccine Correct answer.

Explanation

Influenza vaccination is recommended every year for all health care personnel because the circulating strains change and immunity wanes, and because staff can transmit influenza to vulnerable patients even when mildly ill. The other vaccines listed are given on different schedules based on immunity status or exposure risk.

Question 22Health Promotion and Disease Prevention

A community health program aims to reduce dental caries in schoolchildren. Which measure has the strongest evidence for population-level prevention?

  1. Annual dental sealant fairs
  2. School-based brushing reminders
  3. Community water fluoridation Correct answer.
  4. Distribution of sugar-free gum

Explanation

Community water fluoridation is a population-wide, passive intervention that reaches all residents regardless of behavior or access, and it is widely documented to lower caries prevalence across socioeconomic groups. Individual or school-based measures depend on participation and reach fewer people.

Question 23Health Promotion and Disease Prevention

Which level of prevention is a mammogram performed to detect breast cancer before symptoms appear?

  1. Secondary prevention Correct answer.
  2. Tertiary prevention
  3. Primary prevention
  4. Quaternary prevention

Explanation

Secondary prevention aims to detect disease early, when treatment is more effective, through screening such as mammography. Primary prevention prevents disease onset, while tertiary prevention limits disability after disease is established.

Question 24Health Promotion and Disease Prevention

Which factor is best described as a social determinant of health rather than a biological risk factor?

  1. Advancing age
  2. Housing instability Correct answer.
  3. Elevated blood pressure
  4. Family history of diabetes

Explanation

Social determinants of health are the conditions in which people are born, grow, work, and live, including housing, income, and education. Housing instability is such a condition, whereas blood pressure, family history, and age are biological or clinical factors.

Question 25Health Promotion and Disease Prevention

According to the transtheoretical model, a person who intends to start exercising within the next month but has not yet begun is in which stage?

  1. Precontemplation
  2. Preparation Correct answer.
  3. Contemplation
  4. Action

Explanation

In the transtheoretical model, preparation is the stage in which a person intends to act within the next 30 days and often takes small initial steps. Contemplation involves intention within about six months, and action involves recent behavior change.

Question 26Health Promotion and Disease Prevention

What does the term herd immunity describe?

  1. The resistance of a single person after vaccination
  2. Immunity acquired only through natural infection
  3. Complete elimination of a pathogen from a community
  4. Indirect protection of susceptible people when a sufficient proportion of the population is immune Correct answer.

Explanation

Herd immunity is the indirect protection that occurs when enough people are immune that transmission chains break and susceptible individuals are less likely to be exposed. It depends on the proportion immune in the population, not on one person's resistance.

Question 27Health Promotion and Disease Prevention

A clinic wants to increase colorectal cancer screening rates. Which strategy is most consistent with the principles of motivational interviewing?

  1. Providing a single standardized brochure to every patient
  2. Exploring the patient's own reasons for and against screening without pressure Correct answer.
  3. Telling the patient that refusal is irresponsible
  4. Setting a screening date before discussing the patient's concerns

Explanation

Motivational interviewing is a collaborative, person-centered approach that elicits the patient's own motivations and respects autonomy rather than confronting or persuading. Exploring ambivalence supports internal motivation and is more likely to produce lasting behavior change.

Question 28Health Promotion and Disease Prevention

Which measure is the most appropriate indicator of the burden of new disease in a community over one year?

  1. Attack rate in a single outbreak
  2. Prevalence proportion
  3. Case fatality rate
  4. Incidence rate Correct answer.

Explanation

Incidence rate measures new cases arising in a population over a specified period, so it reflects the risk of developing disease. Prevalence counts all existing cases, and case fatality describes the proportion of cases that die.

Question 29Health Promotion and Disease Prevention

A screening test is highly sensitive but has low specificity. What is the most likely consequence when it is applied in a general population?

  1. Many people without disease will test positive and require follow-up Correct answer.
  2. The test will reliably confirm the diagnosis without further testing
  3. The positive predictive value will rise as prevalence falls
  4. Few people with disease will be missed

Explanation

High sensitivity means few false negatives, but low specificity means many false positives, so people without disease will screen positive and need confirmatory testing. Positive predictive value falls, not rises, when prevalence is low.

Question 30Health Promotion and Disease Prevention

Which statement best describes the purpose of a randomized controlled trial in prevention research?

  1. To compare interventions while minimizing confounding through random assignment Correct answer.
  2. To describe the prevalence of risk factors in a population
  3. To monitor trends in disease over decades
  4. To generate hypotheses about rare exposures

Explanation

Random assignment balances known and unknown confounders between groups, allowing causal comparison of interventions. Descriptive prevalence, hypothesis generation, and long-term trend monitoring are served by other study designs.

Question 31Health Promotion and Disease Prevention

A public health nurse wants to apply the precede-proceed model. Which step comes first?

  1. Implementing the intervention
  2. Selecting the health education curriculum
  3. Evaluating program outcomes
  4. Assessing social and epidemiological needs of the community Correct answer.

Explanation

The precede-proceed model begins with social and epidemiological assessment to identify needs and priorities before designing, implementing, or evaluating an intervention. Later phases address educational and ecological diagnosis, administration, implementation, and evaluation.

Question 32Health Promotion and Disease Prevention

Which of the following is a primary prevention strategy for type 2 diabetes in adults at risk?

  1. Medication management for established diabetes
  2. Annual hemoglobin A1c screening
  3. Foot care education for those with neuropathy
  4. Structured lifestyle program promoting weight loss and physical activity Correct answer.

Explanation

Primary prevention acts before disease develops, and intensive lifestyle programs that promote modest weight loss and regular activity reduce progression to diabetes in at-risk adults. Screening detects existing disease, and foot care or medication management address established disease.

Question 33Health Promotion and Disease Prevention

A community has a high proportion of residents without reliable transportation to grocery stores. Which intervention most directly addresses this social determinant?

  1. Offering a class on reading nutrition labels
  2. Screening residents for food allergies
  3. Establishing a subsidized mobile produce market in the neighborhood Correct answer.
  4. Distributing printed diet plans at the clinic

Explanation

Bringing affordable produce into the neighborhood directly reduces the transportation barrier that limits access to healthy food. Education and screening do not change the structural access problem.

Question 34Health Promotion and Disease Prevention

Which concept explains why a person's belief that a behavior will lead to a serious health threat, combined with confidence in their ability to act, predicts behavior change in the health belief model?

  1. Peer pressure alone determines behavior
  2. Genetic predisposition determines behavior
  3. Perceived threat and self-efficacy jointly drive action Correct answer.
  4. Past behavior is irrelevant to future change

Explanation

The health belief model holds that behavior change is more likely when a person perceives a real threat and believes the recommended action will help and that they can carry it out. Perceived threat and self-efficacy therefore work together.

Question 35Health Promotion and Disease Prevention

Which statement about the relationship between incidence and prevalence is correct when disease duration is long and incidence is stable?

  1. Prevalence will be higher than when duration is short Correct answer.
  2. Prevalence will equal incidence
  3. Prevalence will be lower than incidence
  4. Prevalence will approach zero

Explanation

Prevalence depends on both incidence and duration, roughly prevalence equals incidence times average duration. When people survive longer with a condition, more cases accumulate, so prevalence rises relative to incidence.

Question 36Health Promotion and Disease Prevention

A program planner wants to reduce cardiovascular disease through a policy that affects the entire population rather than only high-risk individuals. Which approach reflects a population-based prevention strategy?

  1. Providing statins to patients with elevated cholesterol
  2. Counseling individuals with a family history of heart disease
  3. Enacting a citywide ban on trans fats in restaurant food Correct answer.
  4. Referring patients with hypertension to a specialty clinic

Explanation

Population-based prevention shifts the distribution of risk in the whole community through policy or environmental change, and even small shifts can produce large aggregate benefits. The other options target individuals already identified as high risk.

Question 37Health Promotion and Disease Prevention

A new screening test is evaluated in a population with 1 percent disease prevalence. The test has 90 percent sensitivity and 90 percent specificity. Approximately what is the positive predictive value?

  1. About 8 percent Correct answer.
  2. About 90 percent
  3. About 99 percent
  4. About 50 percent

Explanation

In 10,000 people, 100 have disease and 90 of them test positive; 9,900 are healthy and 990 falsely test positive. The positive predictive value is 90 divided by 1,080, roughly 8 percent, showing how low prevalence sharply reduces predictive value.

Question 38Health Promotion and Disease Prevention

A community coalition wants to evaluate whether its tobacco prevention program reduced youth smoking initiation. Which design provides the strongest causal evidence given that randomization is not feasible?

  1. A single post-program survey of participating youth
  2. Anecdotal reports from teachers
  3. A cross-sectional survey of adult smokers
  4. A quasi-experimental design with a comparable comparison community and pre-post measurement Correct answer.

Explanation

A quasi-experimental design with a comparable comparison group and repeated measures reduces confounding and secular trends, approximating the logic of a controlled trial. Uncontrolled surveys and anecdotes cannot separate program effects from other influences.

Question 39Health Promotion and Disease Prevention

In a case-control study of a rare cancer and an occupational exposure, which measure of association is most appropriate?

  1. Attributable risk percent in the exposed
  2. Incidence rate ratio
  3. Relative risk
  4. Odds ratio Correct answer.

Explanation

Case-control studies sample on outcome, so incidence and risk cannot be directly estimated; the odds ratio approximates the risk ratio when the disease is rare. Relative risk and incidence rate ratios require cohort or follow-up data.

Question 40Health Promotion and Disease Prevention

A health department observes that a vaccination campaign raised coverage from 60 to 85 percent, and measles cases fell sharply three months later. Which reasoning best supports a causal interpretation?

  1. A single region's decline proves causation
  2. The decline must be due to seasonal variation alone
  3. The timing, dose-response relationship with coverage, and consistency across regions strengthen causal inference Correct answer.
  4. Causation cannot be assessed without a randomized trial

Explanation

Causal inference from observational data is strengthened by temporality, a dose-response gradient between coverage and cases, consistency across settings, and biological plausibility. A randomized trial is not always required to build a strong case from such converging evidence.

Question 41Patient Assessment and Data Collection

A patient's blood pressure is recorded as 148/92 mm Hg. Which value represents the diastolic pressure?

  1. 120 mm Hg
  2. 92 mm Hg Correct answer.
  3. 148 mm Hg
  4. 240 mm Hg

Explanation

Diastolic pressure is the lower of the two recorded numbers and reflects arterial pressure during ventricular relaxation. In a reading written as systolic over diastolic, the second number is the diastolic value.

Question 42Patient Assessment and Data Collection

Which adult respiratory rate falls within the accepted normal resting range?

  1. 6 breaths per minute
  2. 34 breaths per minute
  3. 16 breaths per minute Correct answer.
  4. 44 breaths per minute

Explanation

Normal adult resting respiratory rate is approximately 12 to 20 breaths per minute. A rate of 16 falls comfortably inside that range and requires no further interpretation as abnormal.

Question 43Patient Assessment and Data Collection

During an initial interview, which action best demonstrates active listening?

  1. Summarizing the patient's main concerns back to them Correct answer.
  2. Changing the subject when the patient pauses
  3. Documenting in the record while the patient speaks
  4. Finishing the patient's sentences for them

Explanation

Active listening involves reflecting and summarizing what the patient has said to confirm understanding and show engagement. This technique encourages the patient to elaborate and verifies that the clinician has interpreted the message correctly.

Question 44Patient Assessment and Data Collection

Which finding is classified as an objective data element?

  1. A measured oral temperature of 38.2 degrees Celsius Correct answer.
  2. The patient's description of nausea after meals
  3. The patient's report of a throbbing headache
  4. The patient's stated belief that a medication caused rash

Explanation

Objective data are observable or measurable findings obtained through examination or instruments, such as a thermometer reading. Subjective data are what the patient reports or perceives and cannot be independently verified by the clinician.

Question 45Patient Assessment and Data Collection

Which pulse site is most commonly used for routine adult heart rate assessment?

  1. Dorsalis pedis artery
  2. Radial artery Correct answer.
  3. Popliteal artery
  4. Temporal artery

Explanation

The radial artery at the wrist is accessible, comfortable for the patient, and safe for routine rate and rhythm assessment. Other sites are used when the radial pulse is inaccessible or when specific clinical information is needed.

Question 46Patient Assessment and Data Collection

Which technique is correct when auscultating a patient's lung sounds?

  1. Auscultate through clothing to keep the patient warm
  2. Ask the patient to breathe rapidly throughout the exam
  3. Place the stethoscope diaphragm firmly and compare side to side Correct answer.
  4. Listen only over the anterior chest wall

Explanation

Lung sounds are best assessed with firm diaphragm contact on bare skin, moving systematically and comparing symmetric areas. Side-to-side comparison helps detect unilateral changes such as diminished or adventitious sounds.

Question 47Patient Assessment and Data Collection

Which pain scale is most appropriate for a patient who cannot reliably report a numeric rating?

  1. Numeric rating scale from 0 to 10
  2. Verbal descriptor scale using mild to severe
  3. Wong-Baker FACES scale Correct answer.
  4. Visual analog scale marked on a line

Explanation

The Wong-Baker FACES scale uses pictures of facial expressions and is designed for patients who have difficulty expressing pain numerically, including some older adults and children. It relies on recognition of expressions rather than abstract number assignment.

Question 48Patient Assessment and Data Collection

Which value represents a normal adult resting heart rate?

  1. 140 beats per minute
  2. 180 beats per minute
  3. 72 beats per minute Correct answer.
  4. 28 beats per minute

Explanation

Normal adult resting heart rate is generally 60 to 100 beats per minute. A rate of 72 falls within this range and is considered normal.

Question 49Patient Assessment and Data Collection

A seated patient's blood pressure reads 150/94 mm Hg. Which classification best fits this reading?

  1. Stage 2 hypertension Correct answer.
  2. Normal blood pressure
  3. Elevated blood pressure
  4. Hypotension

Explanation

A systolic of 150 mm Hg with a diastolic of 94 mm Hg exceeds the stage 2 hypertension thresholds of 140 systolic or 90 diastolic. Classification follows the higher of the two categories when systolic and diastolic disagree.

Question 50Patient Assessment and Data Collection

Which finding most strongly suggests respiratory distress during inspection?

  1. A soft cough after drinking water
  2. A resting rate of 16 breaths per minute
  3. Use of accessory muscles with nasal flaring Correct answer.
  4. Symmetrical chest expansion

Explanation

Accessory muscle use and nasal flaring indicate increased work of breathing and are classic signs of respiratory distress. These findings suggest the patient is unable to meet ventilatory demands through normal effort.