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Special Specimens: it’s a heart, Jim, but not as we know it

unusual pig heart

Sometimes something so unusual appears that we can’t help ourselves and we have to cut it up ourselves. This heart presented us with one of those times.

On the outside it was rough textured and the tissue was very soft.  It was easy to pull a piece off with your fingers.

On the inside the right side chambers had a few differences to a normal heart.  The right atrium and ventricle were both very circular in shape compared to a typical heart.  The pectinate muscles and the trabeculae carnae were almost non-existent so inside the right side chambers was very smooth.

There was a layer of tissue on the outside that was obviously different to the rest of the myocardium.

The pericardium was separate and appeared quite normal, as did the rest of the pluck.

At the outset we thought we might have a parasitic infection and were a bit disappointed to find no evidence of it when we opened up the heart.  Perhaps it was a congenital defect or a viral infection that caused it?  If anyone has any insight into what we had then we’d love to hear it.   Drop us a line here.

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Top Tip: inject the heart vascular system with paint

bovine heart with paint injected into the vascular system
bovine heart with paint injected into the vascular system
bovine heart with paint injected into the vascular system

Here’s a top tip that I first was given by a very experienced biology teacher at Brisbane Grammar. You can inject the vascular system of a heart with paint to highlight the blood vessels.  I had a practice yesterday and found it much easier on this bovine heart than I ever have on a porcine heart.  I’m not very experienced with syringes and needles, though, and there were plenty of labbies in the porcine pluck workshop at ConQEST that did a great job of it.

My tips for success:

  • Water down the paint a bit to make it easier for the syringe and needle.
  • Use a brightly coloured paint.  Red and blue is tempting but yellow, orange and green show up much more clearly.
  • Allow a bit of air to flow out of the needle into the blood vessel ahead of the paint if you can.
  • Massage the paint along the finer vessels with your finger.
  • Try not to tell the lady at the craft shop what you really want to use the paint for.  She will just look thoroughly disgusted and keep one eye on you until you finally get out of her shop.

I’ve also been told you can let the paint dry and see the highlighted vessels by cutting across the muscle and looking for the paint.

It’s fun!  Give it a go!

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How to ruin a perfectly good educational opportunity – have a heart

image of a whale heart
Image of a whale heart pinned on Pinterest

This photo has been doing the rounds of Pinterest recently captioned as “the heart of a blue whale”.  I haven’t been able to find the original source of the photo or been able to confirm that it’s a heart from a whale.  Regardless – it’s a big heart and an impressive photo and there are more of them here.

My point here is that it is obviously a photo taken in a lab of a heart that is going to be studied.  It would not have been easy to get and it obviously wasn’t easy to maneuver into the lab.  And what have they done?  Chopped the top off it and made it almost completely useless as a teaching specimen.

What a shame.

Miss Vivi

 

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Specimens for ANZSCTS conference wetlab

Last week we sent out some hearts for the conference of the Australian and New Zealand Society of Cardiac and Thoracic Surgeons (ANZSCTS).  Today I’ve received a picture of one of them ready for action.

bovine heart prepared for Bentall procedure workhsop
Bovine heart prepared for Bentall procedure workshop

And what were they going to do with them?   Replacement of the aortic valve, aortic root and ascending aorta in a workshop on the Bentall procedure.

Labbies will be pleased to note that even for heart surgeons sometimes it all comes down to skewers and sticky tape!

Miss Vivi