Misc Flashcards
Which are the thicker strands: actin or myosin?
Myosin
Are troponin and topomyosin “guarding” the actin or myosin?
Actin
What are some clinical signs of intermittent claudication upon physical examination?
- Cool limb
- Hair loss
- Prolonged capillary refill
Chronic limb ischaemia vs chronic limb threatening ischaemia
Chronic limb ischaemia: A general term to describe the range of symptoms and signs of limb ischaemia, can range from asymptomatic to limb threatening
Chronic limb threatening ischaemia: A collection of symptoms and signs depicting a critical reduction perfusion which cannot fulfil rest demands.
What does a doppler scan measure?
Blood flow
Thrombosis vs Embolism vs Thromboembolism
- Thrombosis occurs when a thrombus, or blood clot, develops in a blood vessel and reduces the flow of blood through the vessel.
- Embolism occurs when a piece of a blood clot, foreign object, or other bodily substance becomes stuck in a blood vessel and largely obstructs the flow of blood.
- A similar condition, thromboembolism, refers to a reduction in blood flow that’s specifically caused by an embolism from a blood clot.
How do vascular barorecptors detect blood pressure?
Detect arterial stretch
Explain how ST elevation occurs
- Ischaemia in some areas
- Those cells don’t produce enough ATP to keep potassium channels closed
- As a result, there is an outflow of potassium in ischaemic regions
- This causes a relative potential difference to occur, creating a current
- Thus, the normally isoelectric ST segment is now elevated
Why does ST depression occur on NSTEMI?
- The infarct is subendocardial
- Therefore, the current now flows away from the electrodes, causing an ST depression
What is cardiac ejection fraction?
The amount of blood in each stroke as a percentage of end-diastolic volume
