| Course | DNRS 6501 Advanced Pathophysiology (DNP level) |
|---|---|
| Week | Week 2 |
| Paper type | Annotated concept map |
| Length | About 790 words, 5 pages |
| Format | APA 7 student paper |
| School | Walden University |
| Program | Doctor of Nursing Practice (DNP) |
| Updated | October 2026 |
Free sample paper for DNRS 6501 Week 2
Concept Map: From One LDLR Variant to an Achilles Tendon Xanthoma in a 34-Year-Old Woman
Student Name
College of Nursing, Walden University
DNRS 6501: Advanced Pathophysiology (DNP level)
Instructor Name
Month Day, Year
Concept Map: From One LDLR Variant to an Achilles Tendon Xanthoma in a 34-Year-Old Woman
The Case Behind the Map
The map traces a single pathway in a composite 34-year-old woman. Her fasting LDL cholesterol is 262 mg/dL, both Achilles tendons are thickened with firm nodules consistent with xanthomas, and her father's first heart attack came at 44. Genetic testing found one pathogenic missense variant in the LDL receptor gene, LDLR, of a type that causes the receptor to misfold. She has no symptoms of coronary disease and has not had coronary imaging. The map runs from the variant on the left to what a clinician recorded on the right, and every arrow carries a verb so the pathway can be read aloud.
The Map
Nodes run left to right in the order below. Rectangles are molecular or cellular states, rounded boxes are measured or examined findings, and dashed arrows are inferred links. No color is used.
Table 1
Nodes and Labeled Links, Left to Right
| Node | State | Arrow to next node (verb) |
|---|---|---|
| 1 | One LDLR missense variant (heterozygous) | encodes |
| 2 | Misfolded receptor retained in the endoplasmic reticulum | reduces |
| 3 | About half the normal number of LDL receptors on hepatocyte surfaces | slows |
| 4 | Hepatic uptake of circulating LDL particles | raises |
| 5 | Plasma LDL cholesterol, about twice normal from birth (measured: 262 mg/dL) | drives |
| 6 | Entry and retention of LDL in connective tissue and arterial intima, where it is oxidized | is engulfed by |
| 7 | Macrophages that become lipid-laden foam cells | accumulate as (branch 2) |
| 8 | Achilles tendon xanthomas (examined finding) | end of observed pathway |
| 9 | Intimal plaque in coronary arteries (inferred, dashed) | end of inferred pathway |
Branch Points
Branch 1 sits between nodes 1 and 3. The condition that decides it is the number of affected alleles. With one variant, as here, about half the receptors reach the surface and LDL is roughly doubled. With two, receptor activity is near absent, LDL is several times normal, and xanthomas and coronary disease appear in childhood. The same arrows run, but at a different magnitude.
Branch 2 sits after node 7. The condition that decides it is the tissue in which foam cells gather. In tendons, where matrix turns over slowly, they form the xanthomas that were examined. In the arterial intima, they form the fatty streak that can become plaque, and whether that plaque becomes a coronary event depends on added conditions, such as smoking, blood pressure, and lipoprotein(a), which the map does not trace.
The Pathway Read Aloud
Read from left to right, the map says: one LDLR variant encodes a misfolded receptor, which the endoplasmic reticulum retains; retention reduces the receptors that reach the hepatocyte surface; fewer receptors slow the liver's uptake of LDL; slower uptake raises plasma LDL from birth; high LDL drives its entry into tendon and arterial tissue, where it is oxidized and engulfed by macrophages; those foam cells accumulate in her tendons as the xanthomas that were examined, and, by inference, in her coronary intima as plaque. If any sentence in that chain cannot be said without hesitation, the arrow behind it is the one to check first. In this map, the hesitation falls on the last clause, which is why that arrow is dashed.
Annotation: Defending the Links
Link 1 to 2. Variants in LDLR are grouped by what they do to the receptor, and one class produces proteins that fold abnormally and are held in the endoplasmic reticulum rather than transported to the cell surface (Hobbs et al., 1992). Her variant is of that transport-defective type.
Link 3 to 4. Hepatic LDL receptors bind LDL particles and carry them into the cell by endocytosis, and the liver's clearance of LDL depends on how many receptors are at the surface (Goldstein & Brown, 2009). Halving surface receptors slows clearance.
Link 4 to 5. Slower clearance lengthens the time LDL circulates, which raises its plasma concentration; in heterozygous familial hypercholesterolemia, LDL is elevated from birth, so the lifetime exposure is far larger than the single value suggests (Nordestgaard et al., 2013).
Link 7 to 8. Tendon xanthomas are deposits of cholesterol-laden foam cells, and in a patient with this LDL level, tendon xanthomas are one of the physical findings that support the clinical diagnosis (Nordestgaard et al., 2013).
Flagged as inferred: link 6 to 9. The map shows coronary plaque, but she has had no coronary imaging, so its presence is an inference from lifelong LDL exposure and her family history, not an observed finding. The arrow is dashed for that reason. A coronary artery calcium score or angiography would convert it to an observed link or remove it. Keeping it dashed protects the rest of the map, whose links rest on her variant, her measured LDL, and her examined tendons.
References
Goldstein, J. L., & Brown, M. S. (2009). The LDL receptor. Arteriosclerosis, Thrombosis, and Vascular Biology, 29(4), 431-438. https://doi.org/10.1161/ATVBAHA.108.179564
Hobbs, H. H., Brown, M. S., & Goldstein, J. L. (1992). Molecular genetics of the LDL receptor gene in familial hypercholesterolemia. Human Mutation, 1(6), 445-466. https://doi.org/10.1002/humu.1380010602
Nordestgaard, B. G., Chapman, M. J., Humphries, S. E., Ginsberg, H. N., Masana, L., Descamps, O. S., Wiklund, O., Hegele, R. A., Raal, F. J., Defesche, J. C., Wiegman, A., Santos, R. D., Watts, G. F., Parhofer, K. G., Hovingh, G. K., Kovanen, P. T., Boileau, C., Averna, M., Borén, J., . . . European Atherosclerosis Society Consensus Panel. (2013). Familial hypercholesterolaemia is underdiagnosed and undertreated in the general population: Guidance for clinicians to prevent coronary heart disease. European Heart Journal, 34(45), 3478-3490. https://doi.org/10.1093/eurheartj/eht273
The Walden DNRS 6501 Week 2 instructions
The second week typically asks for a concept map that traces a disorder from its origin at the genetic or cellular level to a clinical presentation. Expect the prompt to require labeled connections, not just shapes, along with a short written annotation explaining the strongest links. Many instructors limit the number of nodes so that the map stays readable, and some ask that branch points or modifying factors be shown. The annotation is where sources come in, cited in APA 7, and it should defend the links rather than define each node. A case, real in structure but composite in detail, gives the map an endpoint to reach. Most sections accept any drawing tool so long as the final file opens cleanly and the text is legible at normal size.
How this DNRS 6501 Week 2 example is built
The map holds nine nodes and no more, arranged left to right from a variant in a single gene to a functional deficit and then to what a clinician records. Every arrow is labeled with a verb, so a reader can say the pathway aloud without guessing at the connections. Two branch points appear where the pathway could go a second way, each marked with the condition that decides which branch runs. Nodes carry no adjectives. Under the figure sits a page of annotation, roughly three hundred words, in which four links are defended with a citation and one link is flagged as inferred rather than established. Nothing on the map is colored for decoration, and the legend explains only what the shapes mean.
DNRS 6501 Week 2 rubric: what earns full marks
Maps lose points for looking finished while proving nothing. The heaviest credit follows whether an arbitrary reader can traverse the pathway without help, which unlabeled arrows make impossible no matter how tidy the layout. Sections also read for whether the endpoint is genuinely observable, since a map ending at a disease name has stopped one step before the work. Citation placement decides a share of the score in doctoral sections: references belong on the links a reader might question, not stacked in a corner as a bibliography. Marking one connection as inferred usually gains rather than costs, because it shows the writer can tell established mechanism from plausible extrapolation. Sprawl is the quiet killer, and a map covering four conditions at once rarely holds credit on any of them.
Common DNRS 6501 Week 2 mistakes, and how to avoid them
Unlabeled arrows are the most common reason this map loses credit, because a reader cannot tell whether one box causes, accompanies or merely precedes the next. Write a verb on every arrow. A second mistake is filling nodes with adjectives such as "increased" or "abnormal" without naming the state itself; say what changed and in which direction. Writers also crowd the map with every fact from the chapter, which hides the pathway, so cut any node that does not move the reader closer to the finding. In the annotation, do not treat every link as equally proven. Say which one rests on inference and why, as the example does. Check that the case numbers on the map agree with the annotation. Finally, export at a size where the smallest label is still readable.
Get a DNRS 6501 Week 2 example written to your instructions
Forward the map instructions, the software or template the classroom expects, and the case or condition assigned, and a finished map with its annotation page comes back to you. The first custom one is free and lands inside 24 to 48 hours. Family history belonging to a real person stays with that person and is never mapped here.
More DNRS 6501 papers and DNP samples
- DNRS 6501 Week 1: Discussion Post
- DNRS 6501 Week 3: Case Analysis
- DNRS 6501 Week 4: Evidence Appraisal
- DNRS 6501 Week 5: Discussion Post
- DNRS 6501 Week 6: Pathophysiology Brief
- DNRS 6501 Week 7: Differential Analysis
- DNRS 6501 Week 8: Journal Club Critique
- DNRS 6501 Week 9: Discussion Post
- DNRS 6501 Week 10: Case Presentation
- DNRS 6501 Week 11: Synthesis Paper
- DNRS 6521 Week 2: Case Write-Up
- NURS 6914 Week 2: Role analysis
- NURS 6001 Week 2: Paraphrase comparison set
- NURS 6912 Week 2: Pain assessment writeup
DNRS 6501 Week 2 questions, answered
Does a concept map really show up this early?
Often enough to be worth preparing for, though Walden does not publish the week-by-week list that would settle it. Visual mapping tends to appear in the first third of a mechanism course, where the aim is to make reasoning inspectable before papers get long. Whether it lands in the second week or the third, the annotated version is what doctoral sections reward.
What tool was this map drawn in?
Nothing specialized. The example was built with ordinary shapes and connectors, because the credit sits in the labeling and the traversal rather than the rendering. Classrooms differ on submission format, and some ask for an image inside a document while others accept a file on its own, so the instructions in front of you settle that question.
Is the annotation page separate from the map?
In this example it sits below the figure in the same document, which is the arrangement most sections accept when nothing stricter is stated. The point of keeping it attached is that a reader reaches the defense immediately after the figure. Where a rubric asks for a standalone narrative, the same four defended links move across unchanged.
Where can I find a free DNRS 6501 Week 2 sample paper?
This page shows the full LDLR concept map, the pathway read aloud, the branch points and the annotation page, with margin notes on what each part proves.
How many nodes should a DNRS 6501 concept map have?
The example uses nine, enough to run from the variant to the xanthoma without filler. Check your own prompt, since some instructors set a range, and cut any node that does not advance the pathway.