18 January 2017, 21:08
GunsCoreUPDATED with Useful Info:PH Andrew Schoeman bitten by Black Mamba and survives!
I hunted with Andrew at Gache Gache in Zimbabwe several years ago and we had a very successful hunt. This is the link to the hunt report I filed here:
http://forums.accuratereloadin...051023091#2051023091 Details are sketchy, but apparently he was slowly riding his motorcycle on a game ranch while viewing some wildebeests when he felt a sharp pain in his lower leg, looked down and saw a Black Mamba attached to it. He was in the hospital within 1.5 hours and received the anti-venom. He passed out and woke up one week later a very lucky man. He expects to return home shortly.
Somebody up there likes him.
I have added the comments of two Medical Doctors to this thread. One who treated Andrew and the other who made some useful comments.
Black Mamba Bite
1. 06-01-2017, 17:08 #1
Willie Barnard
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Black mamba bite
Mamba bite lephalale area:
Was phoned at 08h30 with news of mamba bite victim on his way to hospital. Would be transported with four seater helicopter (game catcher's) and ETA 09h05. Bitten at 08h00.
Eventually arrived 09h25, patient had difficulty to breathe, but conscious.
Was riding motorbike on game farm and watching blue wildebeest, when he felt something strike his right leg. Looked back, and saw a 2 m mamba in the road.
Two fang marks in middle of lower leg lateral side. Fang marks 15 mm apart, had been "dragged" over skin, due to speed of bike.
Patient given oxygen mask, breathing spontaneous and kept oxygen sats at 97%.
Cortisone and promethazine given intravenously. One amp of polivalent antivenom given IV. Patient observed for ten minutes for possible allergic reaction. No allergy. 5 Amps prepared in side-drip and started IV.
After 10 minutes itching and red skin rash. Adrenalin (diluted) given and antivenom stopped. Rash went away. Antivenom started again - rash came back. Antivenom stopped - adrenalin given again. Rash went away but more slowly than first time. Antivenom not restarted.
Patient admitted to high-care ward. Stable for now.
Lessons learned:
- observe patient for at least 30 minutes after first dose of antivenom, for allergic reactions.
-This patient, if again bitten by a snake, should probably not get antivenom again.
Consider Neostigmin (Anaesthetic muscle relaxant reversal) in case of neurotoxic bites.
Sorry no pics, I have forgotten how to upload them!
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Re: Black mamba bite
Was riding his bike with his attention on a herd of Blue wildebeest. Was bitten in motion, and only saw the snake afterwards.
Probably only a small amount of venom injected because of the bike "ripping him away".
Enough though to cause some neurologic symptoms.
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1. Originally Posted by FantomBadger
Out of curiosity, would a mamba's fangs penetrate a jean?
Many years ago I treated a young man who was bitten by a mamba through the then army issue browns. Not only did the fangs penetrate the brown trouserleg (mid thigh anterior), it administered a huge dosage of mamba venom, this guy nearly died. I think a jean is about the same thickness.
1. Originally Posted by Plaashaas
Nice oom doc.
1. What was the treatment prior to arrival at hosp?
2. Could they not have driven to hospital in less than 1:25?
The correct treatment would be:
Get him to hospital as fast as possible.
Support breathing with ambubag/ mouth to mouth resuscitation, if and when the need arises.
The former was done, the latter wasn't necessary. I am not sure whether they were ready with equipment and knowledge to do that.
2. I am usually quite critical of the notion that a helicopter is always the best way of medical evacuation, very often it is slower than road transport.
However, in this case, it probably was the best and fastest way of transport. About 25 minutes of the time was used by the victim to get back to the farmhouse, and start making calls. I am not sure about what vehicles (and drivers) were available on the farm. The farm is about 1h30 fast driving from the hospital.
1. Re: Black mamba bite
Thanks for all the well wishes. Ddeswardt is right about the antivenom.
LukeS is right about the respiratory support and fast evacuation.
Tourniquet ONLY when the victim is alone, needs to evacuate himself, and has been bitten on a limb by neurotoxic snake.
(Black and green mamba, snouted cobra and cape cobra.)
Then tourniquet should be rubber and tight enough to cut of arterial blood flow. If victim can reach phone signal, and summon help within 30 minutes, dont use the tourniquet.
Much more important to equip yourselves with BVM Resussitator (ambu bag) and know how to use it.
Much has happened here - update in next post
On Friday night at 18h00 and again at 23h30 I saw him and everything seemed okay.
Was complaining a bit about swollen throat at last visit.
Gave some cortisone again. Was looking forward to discharging him the next day.
Saturday morning 04h00: CRISIS
Oxygen saturation dropped, had to resuscitate, intubated, ventilated. Lots of secretions sucked from lungs.
Adrenalin given again, blood gas analysis showed low pH. Soda-bic given.
Transfer to ICU arranged, managed to get some really competent ambulance staff for transfer.
(Helicopter cannot fly because of all the rain in Pretoria)
Reached ICU at 13h30. He is okay there, on ventilator, but I think he will survive.
What happened? I thought it was the allergic reaction. The ICU specialist thinks it was still the effect of the mamba venom causing paralysis.
I gave it a rethink, and am thinking along the lines of Acute respiratory distress syndrome (ARDS). This can be caused by the antivenom, or by the combination of stressors.
Lesson: "There are no routine mamba bites."
1. Hi all. This is an interesting case. Some updates which are useful for the practitioners who see these patients.
We now don't think of "cyto/neuro/haemotoxic" venoms, but rather of the 3 syndromes of progressive weakness, progressive painful swelling or bleeding. This syndromic approach allows the practitioner to treat the symptoms rather than get involved in the identification of the snake. We often get a poor dead snake bought into the casualty, who the family swears bit the patient, but is often an innocent bystander that they caught and killed immediately after the bite occurred. The exception to this is the experienced snake collector or handler who knows his/her snakes. (I once managed a boomslang bite that someone was keeping in a terrarium!)
I don't teach giving a pre-dose with antivenom. This has a poor predictive value of the development of an allergic reaction. We give S/C adrenaline (250ug) and no anti-histamines. Steroids seem to make no major difference as they will take a few hours to work. The whole dose of the antivenom must be given, it is not a weight based dose (even for children). For progressive weakness - 80ml is the dose. For progressive painful swelling 50ml is the dose and for the gaboon adder 200ml is given. Combined PW and PPS 50ml. Monovalent dose for boomslang is 10-20ml. Polyvalent is ineffective in berg adder, night adder and burrowing asp envenomations.
The description of the delayed respiratory compromise may point to a serum sickness (which is a type of delayed immune reaction) to the antivenom. Treatment is largely supportive.
I hope this helps. The two articles I send my registrars to read are behind these links for your reading pleasure!
MULLER, G J et al. Snake bite in southern Africa: diagnosis and management. Continuing Medical Education, [S.l.], v. 30, n. 10, p. 362-381, sep. 2012. ISSN 2078-5143. Available at: <http://www.cmej.org.za/index.php/cme...view/2546/2581>.
http://www.safpj.co.za/index.p...article/view/310/310regards
lithium
2. Re: Black mamba bite
Originally Posted by SamVimes
Thanks, interesting read. One question if I may - why only 50ml for combined PW and PPS? 80ml makes more sense to me, unless you're confident that the weakening is purely due to swelling.
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The risk of the higher dose versus the benefit of the anitvenom needs to be weighed up here. Combined venoms will need lower doses - the PW part of the combined PW & PPS is the more problematic portion of the envenomation, whereas the swelling rarely leads to compartment syndrome (which is the normal indication for antivenom in a patient with PPS). The higher the dose of the antivenom, the more likely the allergic reaction.
Hope this helps.
lithium
1.
Where the OP disappeared to will be explained in another thread.
Thanks for some valuable contributions especially from Lithium and DdeSwardt.
The patient was successfully transferred to an ICU in a Pretoria hospital.
I had the privilege to see him in ICU on Tuesday (10 Jan), and he was doing well.
(Was in Pretoria by coincidence.)
He was ventilated, and eventually weaned from the ventilator.
He was extubated today, and is still in ICU.
We are hoping for a full recovery and discharge some time next week.
This was my closest call by a snake bite case yet, and I must admit, I am a bit shaken by it!
1. Re: Black mamba bite
On Wednesday, a patient is shown into my room, and he looks so familiar. I just can't remember who he is, but I know that I know him.
"I am ............ the guy bitten by the mamba!" he said.
What a nice surprise, he was discharged from hospital, and is back on the farm.
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1.
I'm also from Ellisras and follow our local snake catcher on Facebook. This morning he was on 71 for the month so far.
This is one of the black mambas that he caught recently, according to him about 2.4m.