NURS 6512 I Human Case Study: Chronic-
on-Acute Lumbar Strain in a 54-Year-Old
Male 2026 Case study
Page 1 – Case Overview & Graduate Learning Objectives
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This i-Human case presents a 54-year-old male construction foreman with a chief complaint of worsening low back pain
superimposed on a long-standing history of lumbar strain. The case is designed for graduate-level Advanced Practice
Registered Nurses (APRNs) in NURS 6512 Advanced Health Assessment to integrate comprehensive history-taking, physical
examination, diagnostic reasoning, and evidence-based management within the framework of the chronic-on-acute pain
paradigm.
1.1 Patient Snapshot
Item Details
Name / ID Mr. D.M. — 54-year-old male (identity protected)
Chief Complaint "My back has been killing me for years, but this week it got way worse
after I twisted wrong on the job."
Setting Outpatient primary care / urgent care clinic — APRN-led visit
Course Level NURS 6512 Advanced Health Assessment (Graduate / MSN / FNP track)
i-Human Module Week #9 — Musculoskeletal & Neurological Case Integration
Primary Diagnosis Chronic-on-Acute Lumbar Strain (ICD-10: M54.5 — Low back pain;
S39.012A — Strain of muscle, fascia and tendon of lower back, initial
encounter)
Key Themes Chronic pain assessment, occupational history, red flag screening, APRN
scope of practice, multimodal management, opioid stewardship
1.2 Graduate Learning Objectives
Upon completing this case, the APRN student will be able to:
1. Conduct a comprehensive, graduate-level health history using advanced interview techniques for a patient presenting
with chronic-on-acute musculoskeletal pain.
2. Perform and document a focused and complete physical examination of the lumbar spine, incorporating provocative
maneuvers (SLR, FABER, Patrick's, Waddell's signs) with clinical interpretation.
3. Generate a prioritized differential diagnosis list distinguishing benign mechanical etiologies from serious/dangerous
pathologies using evidence-based red flag criteria.
4. Interpret relevant diagnostic studies (imaging, laboratory, electrodiagnostic) appropriate to the clinical presentation.
5. Construct a comprehensive SOAP note and management plan integrating pharmacological and non-pharmacological
strategies consistent with current clinical practice guidelines (ACP, AAFP, CDC).
6. Apply opioid prescribing stewardship principles and universal precautions for pain management in the primary care
setting.
7. Demonstrate interprofessional collaboration and appropriate referral decision-making.
8. Demonstrate culturally competent care and address social determinants of health affecting this patient's presentation
and management.
1.3 Case Context: Chronic-on-Acute Lumbar Strain
Chronic-on-acute low back pain (LBP) is one of the most common and clinically challenging presentations in primary care. It
represents an acute exacerbation — often from a specific mechanism of injury — superimposed upon a pre-existing chronic
pain condition. This presentation demands that the APRN distinguish new structural injury from flare of known pathology,
screen for dangerous etiologies (malignancy, infection, fracture, cauda equina), and craft a management plan that addresses
BOTH the acute and chronic pain dimensions.
▶ Key Point
Chronic-on-Acute LBP: Requires assessment of BOTH the acute exacerbating event AND the chronic baseline condition.
The APRN must determine: Is this a new injury superimposed on a chronic condition, OR a worsening of the underlying
chronic pathology?
Always re-screen for red flags at EVERY encounter — chronic patients can develop new dangerous etiologies.
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Page 2 – Subjective: Chief Complaint & History of Present Illness (HPI)
2.1 Chief Complaint
"My back has been killing me for years, but this week it got way worse after I twisted wrong on the job site. I can barely walk
this morning."
2.2 HPI — OLDCARTS Framework (Graduate-Level Documentation)
Element Patient Response Chronic Component Acute-on-Chronic Analysis
Onset Acute worsening 4 8 years of progressive New mechanism of injury (rotation under
days ago while lumbar pain from load) superimposed on degenerative
rotating to grab heavy occupational demands baseline
rebar; chronic LBP
present for 8+ years
Location Central and bilateral Has had bilateral Acute exacerbation localized to lumbar
lower back; right > paraspinal discomfort region; no current dermatomal leg
left; does NOT chronically radiation (important negative)
radiate below the
knee currently
Duration Acute phase: 4 days; Chronic: 8 years waxing Acute-on-chronic — two temporally
Chronic phase: 8+ and waning distinct components
years
Character Acute: sharp, Chronic: stiffness worst in Acute: nociceptive, mechanical; Chronic:
stabbing, 'catching' AM (> 30 min), eases with degenerative mechanical with possible
pain with movement; movement myofascial component
Chronic: deep, dull,
aching, stiffness
Aggravating Bending forward, Chronic: end of workday, Flexion-loading mechanics aggravate
rotation, prolonged prolonged physical labor disc; rotation injuries paraspinal muscles
standing, lifting; and facets
morning stiffness;
stairs
Relieving Rest in lateral Has used ibuprofen PRN Fetal position decompresses lumbar disc
decubitus (fetal for years; heat helpful — classic mechanical pattern
position); heat packs;
OTC ibuprofen
(partial relief only)
Timing Constant with acute Perennial — managed Chronic-on-acute pattern; no remission
spikes with with OTCs; no period of suggests advanced degenerative disease
movement; worse true remission in 3 years
morning and after
prolonged activity
Severity Today: 8–9/10; Baseline 4–5/10 limits his 8–9/10 acute pain represents a clinically
Baseline chronic: 4– daily activities at work significant exacerbation requiring
5/10 intervention beyond self-care
2.3 Radiation / Neurological Symptoms
Item Details
Current Radiation None below the knee — no sciatica at this time (important negative for
disc herniation / radiculopathy)
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