| Course | NU104 Pathophysiology for Nursing |
|---|---|
| Unit | Unit 9 |
| Paper type | Concept map |
| Length | About 850 words, 6 pages double-spaced |
| Format | APA 7 student paper |
| School | Purdue University Global |
| Program | BSN (prelicensure) |
| Updated | October 2026 |
Free sample paper for NU104 Unit 9
A Fixed Box and a Growing Clot: A Concept Map of Raised Intracranial Pressure From an Epidural Hematoma After a Ladder Fall in a Composite 38-Year-Old, With a Separate Seizure Cluster Attached at One Labeled Link
[Student Name]
Purdue University Global
NU104: Pathophysiology for Nursing
Unit 9 Concept Map
[Instructor Name]
[Date]
The patient is a composite; the map is given as numbered nodes and labeled links because the original is a diagram.
The Case at the Center
[Kevin], a composite 38-year-old house painter, fell about [3] meters from a ladder and struck the side of his head. He was briefly knocked out, then woke, talked normally and refused an ambulance. About an hour later his coworker found him confused and drowsy, with a headache and vomiting. In the emergency department his right pupil was larger than his left, and he had a generalized seizure lasting about a minute. A scan showed a lens-shaped collection of blood between the skull and the outer covering of the brain on the right side, beneath a skull fracture.
Main Chain: Nodes
1. Fixed cranial volume. The adult skull is a rigid box holding brain tissue, blood and cerebrospinal fluid.
2. Skull fracture over the temple. The thin bone at the side of the skull breaks.
3. Torn middle meningeal artery. The artery running in a groove on the inner skull is torn by the fracture.
4. Epidural hematoma. Arterial blood strips the outer covering of the brain away from the skull and collects in a growing pocket.
5. Early compensation. Cerebrospinal fluid shifts into the spinal canal and venous blood is pushed out of the skull.
6. Exhausted compensation. Once those reserves are used, small added volumes raise pressure sharply.
7. Raised intracranial pressure.
8. Reduced cerebral perfusion pressure. Perfusion pressure equals mean arterial pressure minus intracranial pressure.
9. Brain ischemia.
10. Herniation. Brain tissue is pushed across the rigid folds inside the skull.
11. Signs. Headache, vomiting, falling level of consciousness, a dilated pupil on the side of the clot, and later a rise in blood pressure with a slow heart rate and irregular breathing.
Main Chain: Labeled Links
2 to 3: "tears." The fracture line crosses the artery's groove. 3 to 4: "bleeds under arterial pressure into." Arterial pressure lets the clot grow quickly. 1 to 5: "forces." Because the skull cannot expand, any added volume must be offset by removing another. This relationship is often called the Monro-Kellie doctrine (Rogers, 2023). 4 to 5: "is offset at first by." 5 to 6: "runs out, leading to." This explains Kevin's lucid interval: while compensation held, he talked normally. 6 to 7: "produces." 7 to 8: "lowers." As intracranial pressure approaches arterial pressure, the gradient that drives blood into the brain shrinks. Treatment guidelines for severe brain injury set targets for both pressures because of this relationship (Carney et al., 2017). 8 to 9: "causes." 7 to 10: "if unrelieved, causes." 10 to 11: "compresses the third cranial nerve, producing a dilated pupil," and "compresses the brainstem, producing the late triad." 9 to 11: "produces falling consciousness."
The lucid interval is not a sign of a mild injury; it is the time the skull's spare room took to run out.
Seizure Cluster: Nodes and Links
12. Irritated cortex. Blood and pressure on the brain surface disturb the neurons beneath.
13. Imbalance between excitation and inhibition. Excitatory signaling outweighs the inhibitory signaling that normally keeps firing controlled.
14. Excessive, synchronized neuronal firing. Large groups of neurons discharge together.
15. Generalized seizure. The discharge spreads to both hemispheres, producing loss of consciousness and rhythmic jerking.
Link joining the two clusters, 4 to 12: "irritates." This is the only arrow connecting the main chain to the seizure cluster. 12 to 13: "disturbs." 13 to 14: "allows." 14 to 15: "spreads to produce." 15 to 7: "raises metabolic demand and can raise." A dotted arrow shows that a prolonged seizure increases brain blood flow and oxygen use, which can worsen pressure.
A seizure within the first week after a brain injury is classed as an acute symptomatic seizure, provoked by the injury, rather than as epilepsy, which requires unprovoked seizures or a high risk of recurrence (Fisher et al., 2014).
What the Map Predicts
Read from left to right, the map predicts that Kevin will keep worsening until the clot is removed, because the hematoma is the root of both clusters. Removing it through surgery would relieve the pressure, restore perfusion and remove the cortical irritation. The map also explains the nursing observations that matter most: repeated checks of consciousness and pupils to detect the change from compensated to exhausted pressure, and seizure precautions while the cortex remains irritated.
Reading the Map
The main chain runs along the top in solid arrows from trigger to signs. The seizure cluster sits below, connected only at node 4 and through the dotted feedback arrow to node 7. Keeping the clusters apart shows that the seizure is a consequence of the hematoma, not a step on the path to herniation.
References
Carney, N., Totten, A. M., O'Reilly, C., Ullman, J. S., Hawryluk, G. W. J., Bell, M. J., Bratton, S. L., Chesnut, R., Harris, O. A., Kissoon, N., Rubiano, A. M., Shutter, L., Tasker, R. C., Vavilala, M. S., Wilberger, J., Wright, D. W., & Ghajar, J. (2017). Guidelines for the management of severe traumatic brain injury, fourth edition. Neurosurgery, 80(1), 6-15. https://doi.org/10.1227/NEU.0000000000001432
Fisher, R. S., Acevedo, C., Arzimanoglou, A., Bogacz, A., Cross, J. H., Elger, C. E., Engel, J., Jr., Forsgren, L., French, J. A., Glynn, M., Hesdorffer, D. C., Lee, B. I., Mathern, G. W., Moshé, S. L., Perucca, E., Scheffer, I. E., Tomson, T., Watanabe, M., & Wiebe, S. (2014). ILAE official report: A practical clinical definition of epilepsy. Epilepsia, 55(4), 475-482. https://doi.org/10.1111/epi.12550
Rogers, J. L. (Ed.). (2023). McCance & Huether's pathophysiology: The biologic basis for disease in adults and children (9th ed.). Elsevier.
The Purdue Global NU104 Unit 9 instructions
Unit 9 usually asks for a concept map that holds two neurologic mechanisms, often raised intracranial pressure and seizure activity, without merging them. Prompts want nodes for the key concepts, labeled links naming each process, and a brief explanation of the map. Instructors look for the fixed-volume principle stated clearly, the difference between compensated and decompensated pressure, perfusion pressure explained as a relationship between two pressures, and a seizure mechanism that is connected to the main chain only where it actually arises. A case anchors the map and lets each node be checked against findings. Labeling a seizure correctly as provoked or unprovoked shows careful reasoning about classification. A short key explaining arrow styles, solid for the main chain and dotted for feedback, helps the grader.
How this NU104 Unit 9 example is built
The map opens with the case, including the lucid interval, the dilated pupil and the seizure. Eleven nodes form the main chain, followed by labeled links such as tears, is offset at first by, runs out and lowers. The highlighted line explains the lucid interval as the time spare room in the skull took to run out. The seizure cluster adds four nodes and is joined to the main chain at a single irritates link, with a dotted feedback arrow toward pressure. A sentence classifies the seizure as provoked by the injury. The map's prediction for the patient and a note on its layout close the paper, with solid arrows along the top and the seizure cluster below.
Reading the NU104 Unit 9 grading rubric
Concept maps in NU 104 are generally evaluated on accuracy of concepts, quality of labeled links, clarity of structure, and application to the case. Accuracy rewards correct physiology, such as perfusion pressure equaling mean arterial pressure minus intracranial pressure. Link quality is weighted heavily: each arrow should name a process rather than simply connect boxes. Structure earns credit when separate mechanisms remain distinct and are joined only where they truly interact. Application points go to maps that explain the patient's findings and predict the course. A brief written explanation, correct terminology and APA 7 references complete most rubrics for this assignment. Neat, readable layout matters too, since a crowded map hides its own logic.
NU104 Unit 9 help: mistakes that cost points
Concept maps in this unit often merge the seizure and pressure mechanisms into one tangled chain, so neither is clear. Another frequent problem is drawing raised pressure as a direct cause of every sign without showing compensation, which leaves the lucid interval unexplained. Some maps leave arrows unlabeled or use vague verbs. Others describe a seizure after a head injury as epilepsy. Keep the main chain and the seizure cluster on separate branches, join them only at the link where one causes the other, show compensation before decompensation, label every arrow with a process, and classify an early seizure after injury as provoked. Read each branch aloud as a sentence to test that it makes sense.
Get an NU104 Unit 9 example written to your instructions
Your Unit 9 prompt may name raised intracranial pressure, seizures, stroke or another neurologic mechanism. Whichever it is, send it along with the template and rubric, and the first concept map is free, returned inside 24-48h and built to those instructions. Scenario patients are fictional composites. The paper above is an original model document written by our desk, not a submitted student paper and not an official Purdue University Global document.
More NU104 papers and BSN samples
- NU104 Unit 1: Discussion Board Post
- NU104 Unit 2: Concept Map
- NU104 Unit 3: Case Study Analysis
- NU104 Unit 4: Mechanism Write-Up
- NU104 Unit 5: Systems Review
- NU104 Unit 6: Seminar Reflection
- NU104 Unit 7: Lab Value Interpretation
- NU104 Unit 8: Case Study Analysis
- NU104 Unit 10: Final Synthesis Paper
NU104 Unit 9 questions, answered
Where can I find a free NU104 Unit 9 sample paper?
Read the full NU104 Unit 9 concept map here: the case, the main chain from fixed skull volume to herniation, the separate seizure cluster, labeled links, the map's prediction and a reading note, with three references. A map for your own assigned case can be written on request.
What explains the lucid interval in an epidural hematoma?
Early on, cerebrospinal fluid and venous blood are pushed out of the skull to make room for the clot. While that compensation holds, the patient can talk normally; once it runs out, pressure rises sharply and consciousness falls.
How is cerebral perfusion pressure calculated?
It equals mean arterial pressure minus intracranial pressure. As intracranial pressure rises toward arterial pressure, the gradient that drives blood into the brain shrinks and brain tissue becomes ischemic.
Is a seizure after a head injury epilepsy?
Not when it happens within the first week. It is classed as an acute symptomatic seizure provoked by the injury. Epilepsy requires unprovoked seizures or a high risk that they will recur.
Why does a pupil dilate on the side of the clot?
The expanding hematoma pushes brain tissue against the third cranial nerve, which controls pupil constriction. Compression of that nerve on the same side leaves the pupil larger and slow to react.