The Knee Was Dry, the Thigh Was Not: An Unfolding Case Study That Teaches Students to Notice Compensated Hemorrhage After Knee Replacement, Built on Tanner's Clinical Judgment Model
Student Name
American College of Education
NUR5203: Advanced Pathophysiology and Health Assessment
Module 5 Assignment
Instructor Name
February 8, 2028
Purpose, Learners and Framework
The case is written for second-year prelicensure students in the author's medical-surgical clinical group, who have completed courses in fluids and electrolytes and in perioperative care. Its purpose is to teach them to recognize compensated hypovolemia before blood pressure falls. At the end of the case, students will be able to identify the earliest signs of blood loss in a postoperative patient, explain each sign by the body's compensatory response, calculate and interpret a shock index, and state what they would report and to whom at each stage.
An unfolding case releases information in stages, so that students must commit to an interpretation before they see how the situation develops. West et al. (2012), describing the use of unfolding cases in prelicensure nursing education, emphasized that the approach engages students actively in decision-making based on realistic scenarios and supports the development of clinical judgment. The questions at each stage follow the model of clinical judgment described by Tanner (2006), in which nurses notice, interpret, respond and reflect. Noticing questions ask what has changed; interpreting questions ask what it means; responding questions ask what to do; and reflection comes in the debrief.
Stage One: Evening of Surgery, 1900
Mr. H., a composite 71-year-old man, had a right total knee arthroplasty at 1300 under spinal anesthesia. He takes metoprolol for hypertension and took his morning dose. At 1900 his vital signs are blood pressure 132/76 mm Hg, heart rate 88, respiratory rate 18, temperature 37.2 degrees C and oxygen saturation 96% on room air. His preoperative hemoglobin was 13.8 g/dL and a 1700 value was 11.9 g/dL. The knee dressing is dry. He says his thigh feels tight and asks for more pain medication, although he had a dose 90 minutes ago.
Questions. What has changed since before surgery? What could explain the thigh tightness and the pain request? Which additional assessment would you make now?
Expected reasoning. A fall in hemoglobin of this size is common after knee replacement and not alarming by itself. The thigh tightness is the cue to notice. Blood from the joint can track into the thigh, where it may not show on the knee dressing. Students should inspect and measure the thigh circumference against the other side, check the pedal pulses and sensation, and note the time of the last pain dose. A heart rate of 88 in a patient taking a beta-blocker deserves attention, because the drug blunts the rise in heart rate that would otherwise signal blood loss.
Stage Two: 2300
At 2300 Mr. H. is restless and asks to sit up. Blood pressure 124/88 mm Hg, heart rate 104, respiratory rate 22, oxygen saturation 95%. His hands and feet feel cool. Urine output has been 20 mL per hour for two hours. His right thigh measures 4 cm more than the left at the same level, up from 1.5 cm at 1930. The knee dressing is still dry.
Questions. Which findings have changed, and what does each tell you about his circulation? Calculate his shock index. Is he in shock? What do you report, to whom, and with what request?
Expected reasoning. Each change reflects compensation for a falling circulating volume. As volume falls, the baroreceptors sense lower pressure and increase sympathetic activity. The heart rate rises, despite the beta-blocker. Arterioles constrict, which keeps the systolic pressure near normal and raises the diastolic pressure, narrowing the pulse pressure from 56 to 36 mm Hg. Blood is diverted from skin and kidneys to vital organs, producing cool extremities and low urine output. Restlessness reflects reduced brain perfusion and rising catecholamines. The shock index, heart rate divided by systolic pressure, is 104 divided by 124, or 0.84, up from 0.67 at 1900. A review of the shock index notes that heart rate and blood pressure often appear normal during compensated shock and can be masked by medications, and that a shock index above 1.0 has been associated with higher mortality and need for transfusion (Koch et al., 2019). He is in shock, compensated, and the normal-looking systolic pressure is the body's achievement, not the patient's safety. Students should report to the surgical provider using SBAR, stating the thigh measurements, the vital sign trend, the shock index and the urine output, and request evaluation, a hemoglobin and a type and screen.
Stage Three: 0200
The provider was paged at 2320 and asked for a repeat hemoglobin in the morning. At 0200 Mr. H. is confused and pale. Blood pressure 92/64 mm Hg, heart rate 122, respiratory rate 26, oxygen saturation 93%. The thigh is tense and 7 cm larger than the left. A stat hemoglobin is 7.8 g/dL.
Questions. What has happened physiologically? What do you do first, and what do you say when you call?
Expected reasoning. Compensation has failed. Blood loss has exceeded the body's ability to maintain pressure through heart rate and vasoconstriction, so systolic pressure has fallen and the shock index is now 1.33. Confusion reflects inadequate brain perfusion. The nurse should call the rapid response team, lay the patient flat and raise the legs if not contraindicated, apply oxygen, ensure working large-bore access and anticipate transfusion. When calling, the nurse should state plainly that the patient has hemorrhagic shock from a probable thigh hematoma, give the trend since 1900 and ask for immediate bedside evaluation. Escalating to the rapid response team is appropriate after a provider's response does not match the patient's condition.
Debrief
The debrief follows the reflection phase of Tanner's model. Students first describe what they noticed at each stage and when they first thought something was wrong. The facilitator then asks what made the early signs easy to dismiss: the dry dressing, the expected fall in hemoglobin, the beta-blocker and a systolic pressure that looked acceptable at 2300. Students plot the vital signs across the three stages and identify the moment compensation was visible but pressure had not yet fallen. The debrief closes with each student writing one sentence they will use in practice, such as a dry dressing does not mean no bleeding, and one question they will ask about any patient on a beta-blocker. Learning is assessed a week later with a new short case of concealed bleeding after hip fracture repair, in which students must calculate a shock index and state what they would report. The case can be adapted for other settings by changing the procedure and the hiding place of the blood, such as a retroperitoneal bleed after a cardiac catheterization through the femoral artery, while keeping the same three stages and the same questions. Keeping the structure constant lets students see that the pattern of compensation is the same whatever the source of loss, which is the transferable lesson. For simulation, the stages can be run in real time on a manikin, with the thigh measurements given on cards when students ask for them, so that students who do not think to measure never receive the data.
References
Koch, E., Lovett, S., Nghiem, T., Riggs, R. A., & Rech, M. A. (2019). Shock index in the emergency department: Utility and limitations. Open Access Emergency Medicine, 11, 179-199. https://doi.org/10.2147/OAEM.S178358
Tanner, C. A. (2006). Thinking like a nurse: A research-based model of clinical judgment in nursing. Journal of Nursing Education, 45(6), 204-211. https://doi.org/10.3928/01484834-20060601-04
West, C., Usher, K., & Delaney, L. J. (2012). Unfolding case studies in pre-registration nursing education: Lessons learned. Nurse Education Today, 32(5), 576-580. https://doi.org/10.1016/j.nedt.2011.07.002
How this NUR 5203 Module 5 example is structured
NUR 5203 Module 5 commonly builds an unfolding case study that teaches assessment reasoning; your classroom's instructions decide the topic, the level of learners and whether an answer key is required. This example states the learning objectives and framework, presents the case in stages with data that change over time, asks questions at each stage that require interpretation rather than recall, provides expected reasoning grounded in physiology and evidence, and ends with a debrief plan.
NUR5203 Module 5 questions, answered
What does NUR5203 Module 5 usually ask for?
NUR5203 Module 5 commonly asks you to build an unfolding case study that teaches assessment reasoning, with stages, questions and expected answers. Your classroom's instructions decide the topic, the learners and whether a debrief plan is required.
How many stages should an unfolding case have?
Usually three or four, enough for the situation to change meaningfully and for students to commit to interpretations before seeing what happens next. Each stage should add data that tests the previous interpretation.
What makes good questions in an unfolding case?
Questions that require students to notice a change, interpret its meaning and decide on a response, rather than recall a fact. Organizing them by a clinical judgment model helps.
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