| Course | NU104 Pathophysiology for Nursing |
|---|---|
| Unit | Unit 6 |
| Paper type | Seminar reflection |
| Length | About 840 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 6
Same Saturation, Different Lungs: A Seminar Reflection on Two Composite Patients at 88 Percent, One With Collapsed Alveoli After Surgery and One With a Clot, and Why Oxygen Helped Them Unequally
[Student Name]
Purdue University Global
NU104: Pathophysiology for Nursing
Unit 6 Seminar Reflection
[Instructor Name]
[Date]
The two patients are composite cases discussed in seminar; values are illustrative and bracketed.
The Puzzle We Were Given
Our instructor opened the seminar with two patients on the same surgical floor. The first, [Mr. R.], a composite 58-year-old, was two days out from an open bowel resection. He was taking shallow breaths because of incision pain and had refused his incentive spirometer. The second, [Ms. K.], a composite 71-year-old, was five days after a hip fracture repair and had suddenly begun breathing hard, her pulse racing. Both read 88 percent on the pulse oximeter without supplemental oxygen. The instructor asked us whether they had the same problem.
Before the seminar, I would have said yes. I thought of low oxygen as a single problem: not enough oxygen getting into the blood, fixed by giving more oxygen. I had learned the terms ventilation and perfusion, but I used them loosely, as if they meant roughly the same thing.
The Idea That Changed My Thinking
A classmate who works as a respiratory therapy aide drew two alveoli on the whiteboard, each with a capillary beside it. In the first drawing, the alveolus was collapsed, but blood still flowed past it. In the second, the alveolus was full of air, but the capillary was blocked. She said that gas exchange depends on air and blood meeting in the same place, and that each patient had lost that meeting in the opposite direction.
That explained Mr. R. With shallow breathing after surgery, small airways at the bases of his lungs closed and the alveoli beyond them collapsed, a condition called atelectasis. Blood kept flowing past those collapsed alveoli and returned to the heart without picking up oxygen. That blood, mixed with well-oxygenated blood from other areas, lowered his overall oxygen level. In ventilation-perfusion terms, those lung units had perfusion with almost no ventilation, the extreme end of which is called shunt (Petersson & Glenny, 2014).
Ms. K. was the opposite. A clot from her leg had lodged in a branch of the pulmonary artery. The alveoli in that region still filled with air, but no blood reached them, so that air was wasted, a situation called dead space. Her low oxygen had a different cause: blood was diverted to the remaining lung, which received more flow than it could fully oxygenate, and that mismatch lowered her oxygen level (Sarkar et al., 2017).
Both patients had air and blood in their lungs; what they had lost was the meeting of the two in the same place.
Why Oxygen Would Help Them Unequally
The second part of the discussion was what changed my understanding most. The instructor asked what would happen if we gave both patients supplemental oxygen.
For Ms. K., extra oxygen would raise her saturation fairly well, because the lung areas that were still perfused were also ventilated; giving richer air to those alveoli increased the oxygen picked up by the blood passing them. For Mr. R., extra oxygen would help less than expected. The blood flowing past collapsed alveoli never contacts the inspired air at all, so increasing its oxygen concentration does nothing for that blood. Only reopening the alveoli, through deep breathing, coughing, the incentive spirometer, walking and pain control, would fix the problem at its source (Petersson & Glenny, 2014).
That was the moment the idea became practical for me. I had been taught to encourage incentive spirometry after surgery, but I had thought of it as a general good habit. I now understand it as a direct treatment for a specific mechanism of low oxygen.
What I Still Find Difficult
I am less confident about mixed cases. Most real patients probably have some of both problems, and I am not sure how a nurse at the bedside would tell which one dominates without tests. My instructor suggested that the response to oxygen is itself a clue, along with the history, but I want to read more before I rely on that. I also realized that Ms. K.'s carbon dioxide level might be normal or even low at first, because she was breathing fast, which surprised me, since I had assumed any lung problem would raise carbon dioxide (Rogers, 2023).
What I Will Do Differently
In clinical practice, when I see a low saturation, I plan to ask two questions before reaching for the oxygen: is air getting to the alveoli, and is blood getting to them? For a postoperative patient like Mr. R., that means checking his breathing depth, his pain and whether he is using his spirometer. For a patient like Ms. K., a sudden change in breathing with a fast heart rate after immobility is a reason to escalate quickly, not just to turn up the oxygen.
References
Petersson, J., & Glenny, R. W. (2014). Gas exchange and ventilation-perfusion relationships in the lung. European Respiratory Journal, 44(4), 1023-1041. https://doi.org/10.1183/09031936.00037014
Rogers, J. L. (Ed.). (2023). McCance & Huether's pathophysiology: The biologic basis for disease in adults and children (9th ed.). Elsevier.
Sarkar, M., Niranjan, N., & Banyal, P. K. (2017). Mechanisms of hypoxemia. Lung India, 34(1), 47-60. https://doi.org/10.4103/0970-2113.197116
What the NU104 Unit 6 assignment asks for
Unit 6 usually asks you to reflect on a seminar discussion of gas exchange. Prompts commonly want the question or case discussed, one idea that changed your thinking, an explanation of that idea in your own words, and how it will affect your practice. Expect a short first-person paper, often two or three pages. Instructors value reflections that show a real shift in understanding, described honestly, over summaries of the whole session. The idea should be explained accurately, with sources where physiology is described. Naming what you still find difficult shows judgment rather than weakness, and connecting the idea to a nursing action you will take makes the reflection useful beyond the course. Mention classmates only by role, and keep the case details composite.
Inside the NU104 Unit 6 example
The reflection opens with the instructor's two patients and the author's assumption that low oxygen is one problem with one fix. The central section describes a classmate's drawing of two alveoli and uses it to explain shunt in the surgical patient and dead space in the patient with a clot, with the highlighted line on air and blood meeting. The next section, on why oxygen would help them unequally, turns the idea into practice and connects incentive spirometry to its mechanism. The author then names a difficulty with mixed cases and a surprise about carbon dioxide. The closing section sets out two questions the author will ask before reaching for oxygen. Each section is short, and the highlighted line marks the turning point of the author's thinking.
Where the points sit in the NU104 Unit 6 rubric
Seminar reflections in NU 104 are generally marked on depth of reflection, accuracy of content, connection to practice, and writing quality. Depth earns credit when the paper shows how understanding changed, with a before and after, rather than retelling the seminar. Accuracy points go to correct explanations of ventilation, perfusion, shunt and dead space, supported by sources in APA 7. Connection to practice rewards a specific nursing action the new understanding changes. Honest acknowledgment of remaining questions is often credited as part of depth. Clear first-person writing, appropriate length and attention to peers' contributions, described by role, make up the rest of the rubric in most sections. Specific examples from the discussion strengthen the depth score.
NU104 Unit 6 help from the desk
Reflections lose points when they summarize everything discussed and never single out one idea. Others describe a change in thinking without explaining the idea itself, so the instructor cannot tell whether it was understood. Some use the terms shunt and dead space interchangeably, which is the confusion the seminar is meant to clear up. A reflection that ends with a general promise to study more earns little. Pick one idea, state what you believed before, explain the idea accurately with a source, show how it changes a specific nursing action, and say honestly what still puzzles you. Mention classmates by role only. A reflection that admits a mistaken belief tends to convince a grader more than one claiming it was all obvious.
Get an NU104 Unit 6 example written to your instructions
Tell us which seminar question or written alternative your Unit 6 section posted, then attach the rubric. A free first seminar reflection on that respiratory topic comes back within 24-48h, written to your instructions in the first person. Any patient mentioned is a composite, never a real case. 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 7: Lab Value Interpretation
- NU104 Unit 8: Case Study Analysis
- NU104 Unit 9: Concept Map
- NU104 Unit 10: Final Synthesis Paper
NU104 Unit 6 questions, answered
Where can I find a free NU104 Unit 6 sample paper?
The complete NU104 Unit 6 seminar reflection on two patients at 88 percent is on this page, with the puzzle, the idea that changed the author's thinking, why oxygen helps unequally, remaining doubts and a change in practice, with three references. Tell us what your seminar covered and we can draft the reflection.
What is the difference between shunt and dead space?
In shunt, blood flows past alveoli that receive no air, as in collapsed alveoli. In dead space, air reaches alveoli that receive no blood, as when a clot blocks a pulmonary artery. Both lower oxygen by separating air from blood.
Why does oxygen help the surgical patient less?
Blood passing collapsed alveoli never meets the inspired air, so raising its oxygen concentration does nothing for that blood. Reopening the alveoli with deep breathing, coughing, walking and pain control treats the cause.
Can carbon dioxide be normal with a pulmonary clot?
Often, at least early on. The patient breathes faster, which clears carbon dioxide through the remaining lung, so the level may be normal or low even while oxygen is reduced.
How long is an NU 104 seminar reflection?
The sample runs about 800 words in the first person. Most prompts want two to three pages focused on one idea, with sources for the physiology and a link to practice.