(Posts tagged anatomy)

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See, that’s what the app is perfect for.

Sounds perfect Wahhhh, I don’t wanna
biomedicool

Atherosclerosis

biomedicool

Accumulation of fatty material in the artery walls resulting in a narrowing or blocking

  • Affects mainly medium-large arteries
  • Only occurs in arteries with high pressure
  • Does not occur in veins unless exposed to systemic arterial pressures

Atheroma Formation 

  • disease of the tunica intima but can impact on the tunica media
  • accumulation of lipid rich material to for plaques
image

ONE

  • Endothelial damage occurs allowing entry to LDLs (low-density lipoproteins) into the tunica intima

TWO

  • Lipid taken up by macrophages in the intima
  • Accumulates to form a visible white bulge - fatty streak

THREE

  • Continued accumulation of lipids
  • cytokines from macrophages stimulate proliferation of intima cells with features of myofibroblasts
  • these secrete collagen - plaque starts to become fibrotic
  • lesions are more raised and yellower
  • as the lesion develops there is a pressure atrophy of the tunica media and the elastic lamina is disrupted

Four

  • Increased collagen secretion forms a dense, fibrous cap (fibrolipid cap) which is hard and white
  • this advanced plaque shows free lipid as well as the lipid in macrophages
  • collagen build up also weakens the arterial wall
  • endothelium is fragile and often ulcerates, allowing platelet aggregation and formation of a thrombus (clot) (thrombosis)
image
anatomy yep this'll kill ya
regionstraumapro

Do You Really Need To Repeat That Trauma Bay Xray?

regionstraumapro

It happens all the time. You get that initial chest and/or pelvic xray in the resuscitation room while evaluating a blunt trauma patient. A few minutes later the tech returns with another armful of xray plates to repeat them. Why? The patient was not centered properly and part of the image is clipped.

image

Where is the left side of the chest, and do we care?

Do you really need to go through the process of setting up again, moving the xray unit in, watching people run out of the room (if they are not wearing lead, and see my post below about how much radiation they are really exposed to), and shooting another image? The answer to the question lies in what you are looking for. Let’s address the two most common (and really the only necessary) images needed during early resuscitation of blunt trauma.

First, the chest xray. You are really looking for 3 things:

  • Big air (pneumothorax)
  • Big blood (hemothorax)
  • Big mediastinum (hinting at aortic injury)

Look at the clipped xray above. A portion of the left chest wall is off the image. If there were a large pneumothorax on the left, would you be able to see it? What about a large hemothorax? And the mediastinum is fully included, so no problem there. So in this case, no need to repeat immediately.

The same thing goes for the pelvis. You are looking for gross disruption of the pelvic ring, especially posteriorly because this will cause you to intervene in the ED (order blood, consider wrapping the pelvis). So if parts of the edges or top and bottom are clipped, no big deal.

Bottom line: Don’t let the xray tech disrupt the team again by reflexively repeating images that are not technically perfect. See if you can use what you already have.  And how do you decide if you need to repeat it later, if at all? Consider the mechanism of injury and the physical exam. Then ask yourself if there is anything you could possibly see that was not imaged the first time that would change your management in any way. If not, you don’t need it. But it certainly will irritate the radiologists!

Related posts:

anatomy see this is just plain interesting
brainsandbodies
brainsandbodies:
“ Ankle Sprains My sister sprained her ankle in P.E. class a few weeks ago and I shadowed her at her most recent physical therapy appointment.
As her therapist did some soft tissue work, he asked me which plane of motion you work on...
brainsandbodies

Ankle Sprains

My sister sprained her ankle in P.E. class a few weeks ago and I shadowed her at her most recent physical therapy appointment.

As her therapist did some soft tissue work, he asked me which plane of motion you work on first when treating an ankle sprain. Admittedly, it’s been a while since I shadowed in a clinic, but I remembered that moving in the sagittal plane causes the least aggravation. 

image

The sagittal plane at the ankle refers to pointing the toes/ankle towards the ceiling (termed dorsiflexion) and towards the floor (plantarflexion). It is important to regain range of motion progressively after an injury, but movement in the sagittal plane minimizes aggravation to the damaged lateral (to the side) soft tissue of the ankle.

image

Eventually, you work towards regaining motion in the frontal and transverse planes as well, as the tissue continues to heal so that functional movement can be obtained.

*All images are from Google images public searches*

anatomy
firstaid101

Hearts Electrical System (the thump thump!)

firstaid101

Wonder what give your heart that kick to thump? That thump is actually from an electrical system that works within the heart! This electrical system is what keeps the heart pumping blood throughout the body to achieve perfusion. 

SA-> Sinoatrial node (also known as the sinus node.)

AV-> Atrioventricular node

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Normal impulses begin in the sinus node. The impulses travel across both atria causing them to contract which pushes the blood out of the atrium. From here the impulses cross a bridge of special electrical tissue between the atria and ventricles called the atrioventricular node. The signal here is slowed for about one to two tenths of a second to allow blood to pass from the valve to the ventricles. The impulses then exit the AV node and spread throughout both ventricles causing them to constrict, pushing blood into the arteries. 

SPECIAL:

Cardiac muscle cells have a characteristic called automaticity which isn’t found in any other type of muscle cells. Automaticity allows a cardiac muscle cell to contract spontaneously without a stimulus from a nerve source. Meaning if no impulse arrives from the SA node to the rest of the cells, they will create their own impulses stimulating the contraction of the heart. They are not as affective and will be at a generally slower rate.

*This is due to the Anatomic Nervous System (Click Here to learn more about the anatomic nervous system).

anatomy science heart