Quiz yourself on this scenario Every question asks what this model shows for the scenario you built, with the source beneath each answer. It is a check on the mechanisms, not on any real heel.
The scenario As set on the explorer when you opened this quiz.
Heel Resting on the surface
Support surface Standard hospital mattress
Interface pressure 88 mmHg
Shear Some (gradual migration in bed)
Skin moisture Dry
Head of bed Flat
Unrelieved time 2 h
Repositioning None
Age Older adult
Person factors None set Risk in this scenario
High
Illustrative index, not a probability
Question 1. In this scenario, what does the model show about its two damage processes? (select all that apply) Direct deformation, the squashing of tissue against the calcaneus, is the leading process Ischaemia, the slow starving of blood flow, is the leading process Both processes are effectively quiet at this load and time Neither process is running, because the heel is out of contact
Check Question 2. Which settings in this scenario raise the effective pressure above the reading at the interface? (select all that apply) The support surface: Standard hospital mattress The head of bed: Flat The skin moisture: Dry The shear setting: Some (gradual migration in bed) None of them; the effective pressure is at or below the interface reading
Check Question 3. At this scenario's loading time of 2 hours, where does the damage threshold measured in rat skeletal muscle sit in this model? (select all that apply) About 240 mmHg: at this duration only a very high pressure kills cells Sliding down between about 240 and 67 mmHg as the second hour passes About 67 mmHg: past two hours a modest pressure is enough There is no threshold; damage depends on pressure alone
Check Question 4. If the heel in this scenario were held fully clear of the surface, which of these would hold in this model? (select all that apply) Both damage processes stop, because there is no contact Damage from loading before the float can still surface days later The load moves to the calf, which now carries the limb Damage already accumulated is undone The heel is safe from every kind of ulcer from then on
Check Question 5. The pressure and time threshold curve that drives the deformation process was measured in which tissue? (select all that apply) Rat skeletal muscle Human heel tissue Porcine tissue Sheep adipose tissue, tested ex vivo
Check Question 6. Which of these are true of how this model treats medical factors in this scenario? (select all that apply) Malnutrition or dehydration raised the band by one step A previous heel ulcer raised the band by one step Diabetes raised the band by one step No medical factor raised the band in this scenario Taken together, these factors can never move the band more than one step Enough factors together can move the band two or more steps
Check Question 7. Shear is acting at the interface in this scenario. Which statements does the model support? (select all that apply) In human hand tissue, adding shear roughly halved the pressure needed to shut off blood flow Shear lowers the occlusion level, so the ischaemic process starts at a lower pressure In this scenario the skin moisture setting (Dry) is adding to the shear Shear raises the effective pressure used by the deformation process Shear has no effect once the pressure is below 90 mmHg
Check 
Heel Risk Explorer