🧵regarding the 117 deaths in The Iliad where Homer provided details about the mechanism of injury:
Here we will run an M&M conference to consider whether these deaths might have been preventable if the Achaeans and Trojans had modern Level 1 trauma centers at the time. (1/ )
Background:
Recently, I read 'The Iliad' and noticed how often Homer described deaths with anatomic detail.
I then decided to look at these cases as though they occurred near a modern Level 1 trauma center with full capabilities.
Butler's 1898 English translation was used.
Methods:
Assumptions and simplifications included:
- The Achaeans and Trojans each have their own trauma centers
- rapid 'scoop and run' prehospital transport
- the cases present individually, and there are no 'mass casualty' scenarios that would overwhelm the system.
Head injuries in The Iliad appeared to be the most lethal.
22 head injuries were non-preventable. These included both blunt and penetrating mechanisms, with 7 beheadings.
3 blunt head injuries were 'possibly' preventable. The utility of ICP monitors was unknown 🤔.
Neck injuries were common, and were as follows:
9 - nonpreventable
3 - possibly preventable
4 - preventable
Face injuries occurred in a few cases:
4 were possibly preventable and 2 were preventable.
Airway interventions might have helped in at least 8 of the neck/face cases.
Chest injuries were common.
R sided injuries were thought to be more survivable, and presumed cardiac injuries from spears were considered fatal.
There were 24 deaths:
- 9 non-preventable
- 11 possibly preventable
- 4 preventable
Chest tubes may have been lifesaving for many.
Abdominal trauma:
2 cases were non-preventable
3 cases were possibly preventable
16 cases were likely preventable, including 4 cases of isolated liver injury, and 3 cases of evisceration.
Here was the greatest opportunity for improvement (OFI).
Pelvis:
There were 5 deaths from pelvic trauma, all were considered 'preventable'. These included 2 bladder injuries.
1 of these was blunt and might have benefitted from a pelvic binder; whether deployment of a REBOA catheter in zone 3 would have helped is speculative 🤔.
Deaths from isolated injuries to the shoulder region were not rare (9 cases). They occurred more often on the R side.
Cases of simple hemopneumothorax were almost certainly salvageable.
Some may have had subclavian vascular injuries, of which some could have been survivable.
Miscellaneous deaths:
2 extremity injuries were preventable with tourniquets.
1 shoulder disarticulation was possibly salvageable (low likelihood).
5 flank wounds and 3 back wounds - all 'possibly' preventable (not enough data)
Case review: Hector
In particular the death of Hector is difficult to analyze. The mechanism was clearly an injury to the neck. As described by Butler, it was to 'the fleshy part' of the neck, not involving the trachea. He was able to speak to Achilles afterward, and gradually bled out. This may indicate death from a jugular vein injury, which may well have been preventable.
Artists often depict a transfixing type injury (below) in which the spear also goes into the chest. This may have created an injury to one or more of the aortic arch vessels, which would have been far less salvageable.
In conclusion:
It is estimated that ~40% of the casualties from 'The Iliad' may have been salvageable with modern trauma protocols.
Limitations include the retrospective nature of the study and the incompleteness of medical records in many cases. More studies are needed.
⬛️
Addendum:
Some may observe that there were far more than 117 deaths in the Iliad.
The remainder either had unspecified mechanisms (many), or were burns (n=12)
Salvageability estimates can likely be extrapolated to the rest (use of the n=117 to do this is called ‘sampling’).
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We'll go over basic concepts about knots and how to tie the '1-handed' knot.
We will also explore why one of the 'throws' is harder than the other, and a different way to do it that may be new to many who trained in surgery in the U.S. (1/ )
First, let's look at a few basics common to all square knots.
All of the different 'throws' involve creating a loop and then passing one of the two strands through the loop.
What we call '2-handed' or '1-handed' knots are just ways we've learned to do this. Nothing more.
In fact for 2-handed knots, both of the 'throws' follow the same idea:
You are creating a loop, and then passing the string in your nondominant hand through the loop (the green string).
The only thing that differs between the two throws is your initial starting position.
This one is for students and 1st-year residents. 2-handed tying is becoming a lost art in surgery, but I believe it is important to learn.
We'll start here with just the basic steps. More advanced concepts will come later.
(1/)
If you want your first knot to be square, you generally don't want to start off with uncrossed strings (L picture). Instead, it's better to *cross* the two strings first before you start tying the knot (R picture).
There are 2 ways to 'cross' the strings, which we'll see next.
When I do my initial crossing of strings, you'll see it can be done in one of two ways:
Either the L string can be on top, or the R string can be on top.
I can pick either one, but the one I choose will dictate which 'half' of the 2-handed technique I'll need to do first.
Upgrading a prior 🧵regarding polypropylene ('Prolene') suture: the workhorse suture of vascular surgery, though it also has other applications.
As usual, we'll go over some of the properties and uses of Prolene, and a little history. (1/ )
Polypropylene sutures (I'll keep calling them 'Prolene' for the thread) were invented in 1969 and the US patent was approved in 1971. The patent was mostly based on a novel method of preparing monofilament polypropylene into a material that could actually be used for sutures.
In this case I'll skip my customary list of what each size is used for, as it doesn't make for good reading.
Basically, Prolene can be found in sizes from 0 to 10-0. Needles are of different sizes and are often double-armed. They are usually dyed blue to increase visibility.
🧵regarding the Kocher clamp (or 'forceps' if you prefer).
The 'Kocher' is an instrument used by a wide variety of surgical specialists for a number of different things.
Here we will go over its properties and uses, and there will be more than the usual amount of history.
(1/)
Before we start: I should point out that the terms 'forceps' and 'clamp' are used in an imprecise and random manner, both in scholarship and by industry.
The instrument we'll be talking about is alternatively described as a 'Kocher forceps' or 'Kocher clamp'. I'll use both.
As I've said before, Theodor Kocher was a fascinating and influential figure in early surgical history. In my opinion, however many things are named for Kocher, there should be even more things.
Originally, there seem to have been 2 separate 'Kocher' forceps that later merged.
🧵regarding the 'oiling' of surgical sutures, which was once a common practice but one that is quite rare today.
Here I will explain the purpose of 'oiling' a braided suture, some of the history, and some of the properties of braided versus monofilament sutures in general.
(1/)
By 'oiling' (or 'greasing') a braided suture, one hopes to make it behave in some ways more like a monofilament suture, but at the same time still retaining most of the advantages of braided sutures.
Let us look at some of these advantages and disadvantages to see how they work.
Monofilament sutures (like the PDS and Monocryl seen here) have less tissue reactivity and also much less friction when passing through tissues, as compared to braided sutures.
These are some of the reasons why they're used for anastomoses both in the bowel and elsewhere.