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Category Archives: Asphyxia

Q&A with Expanded Audio Discussions Now on the Suspense Magazine Website

Q&A with Expanded Audio Discussions Now on the Suspense Magazine Website

Check out the new posts John Raab of Suspense Magazine and I put together. Read the Q&As and listen to the expanded discussions. Hope each proves helpful for your crime fiction.

Can DNA Be Used To Identify Multiple Assailants In a Three Decade Old Rape?

http://suspensemagazine.com/blog2/2016/12/20/d-p-lyles-forensic-file-episode-1/

In 1863, Could An Autopsy Accurately Determine the Cause of Death?

http://suspensemagazine.com/blog2/2017/01/09/in-1863-could-an-autopsy-accurately-determine-the-cause-of-death-d-p-lyle-answers-this/

Can My Female Character Cause Her Pregnancy To Become “Stone Baby” By Shear Will?

http://suspensemagazine.com/blog2/2016/12/31/can-my-female-character-cause-her-pregnancy-to-become-stone-baby-by-sheer-will/

More to come.

Want more cool questions from crime writers? Check out my three Q&A books.

M&M 200X300

More Info and List of Included Questions

F&F200X302.jpg

More Info and List of Included Questions

MF&F 200X320

More Info and List of Included Questions

 

FORENSICS FOR DUMMIES Release Day

FFD 300X378

 

Forensics For Dummies Updated 2nd Edition is now available.

Get it through your local Indie Bookstore or here:

Amazon: http://www.amazon.com/Forensics-Dummies-Douglas-P-Lyle/dp/1119181658

B&N: http://www.barnesandnoble.com/w/forensics-for-dummies-douglas-p-lyle/1013991421

 

Forensics For Dummies, 2nd Edition Coming Soon

 

FFD 300X378

 

Just got the new cover for Forensics For Dummies, 2nd Edition.

It will be released from Wiley on 2-29-16

Pre-Order now

 

Bad Air: Sewer Gas and Death

sewer-light

Bad air will kill you. One form of bad air is Sewer Gas. It’s a combination of hydrogen sulfide, methane, ammonia, and carbon dioxide. If you enter a sewer or manure pit or some area where these gases are concentrated, you can be a goner is short order. Breathing this combination of gases can kill, and can do so quickly.

This is what happened to Iowa hog farmers Gene and Austin Opheim. Austin went into the manure pit to salvage a piece of equipment that had fallen in, but he was quickly overcome by the gas. HIs father, Gene followed, trying to save his son, but he too fell victim to this treacherous gas.

FROM HOWDUNNIT: FORENSICS:

TOXIC GASES:

SEWER GAS

Hydrogen sulfide is a byproduct of fermentation and is often found in sewers and cesspools. The combination of the two toxic gases hydrogen sulfide and carbon monoxide and the suffocating gas methane is called sewer gas. When inhaled or ingested, hydrogen sulfide converts oxyhemoglobin (hemoglobin rich in oxygen) into methemoglobin, which does not release oxygen to the tissues, thus effectively suffocating the cells of the body. Methemoglobin imparts a dark purple color to the blood, which can be seen at autopsy, where the ME is also likely to fi nd high levels of sulfide in the blood of sewer gas victims. These deaths are almost always accidental and occur when the victim enters an area rich in sewer gas.

Howdunnit Forensics Cover

 

Drowning In Space: When Your Space Suit Is Your Enemy

Gemini 4 Spacewalk

Gemini 4 Spacewalk

 

You would think that the last thing that an astronaut would fear while performing a spacewalk would be drowning. How on earth does that happen? Oh, wait a minute, he wouldn’t be on Earth. I guess out there in the wild blue yonder all the rules change. Ask Luca Parmitano, an Italian astronaut who worked on board the International Space Station (ISS). It seems that over a liter of water accumulated inside his helmet obstructing his ears and his eyes and raising the possibility that he could drown in space.

He isn’t the only one to suffer spacesuit problems during spacewalks, Extravehicular Activities or EVAs in NASA-speak. Here is an interesting article from The New Scientist on five such situations.

 

 
3 Comments

Posted by on September 3, 2013 in Asphyxia, Medical Issues, Space Program

 

Q and A: Can My ME Uncover Drugs in a Charred Corpse?

Q: I have two characters who are found dead in their house, having been at the center of a fire that turned into a wildfire. Before the fire, a hitman gave them some type of medication that he believed would not be detected in an autopsy to cause them to go unconscious or unable to move while he set the fire around them and escaped. The idea is that I want it to look — on the outside, at least — as though they accidentally caused the wildfire, starting in their home in the forest. Then, it’s discovered that they were, technically, murdered by someone giving them a strong sedative (or something) and they were burned in the fire.

When the medical examiner does the autopsy, what is he likely to be able to notice? I read that bodies are usually not burned completely in a fire, but what would the ME find? What kinds of things would he notice and talk about in the report?

Is there a drug that would have a sedative effect on the characters that would NOT show up in an autopsy? Or something that might show up with a particular test and what reasons could an ME have to run that test?

Kari Wolfe, Colorado Springs, CO

 

Iraqi Convoy Bombed During Persian Gulf War

 

A: You are correct that fires rarely destroy a body completely. The fire simply does not burn hot enough or long enough to completely destroy the body in most structure and automobile fires. The same would hold for wildfires. The body would likely be charged severely on the outside and for several inches down but deep inside most tissues would remain intact. This would allow the medical examiner to test the muscles, brain tissue, liver, blood, bone marrow, urine, and the vitreous humor inside the eyes for various drugs.

Almost any narcotic or sedative would work for your purposes but most of these are easily found with even simple toxicological screening and for sure by more sophisticated toxicological testing using gas chromatography and mass spectroscopy.

More sophisticated drugs are not revealed by a routine drug screen and therefore more difficult to find. Add to this the fact that the medical examiner might have no reason to go to the time and expense of looking for more esoteric toxins if all evidence pointed to the victim having died in the fire.

But what if the victim didn’t die in the fire? What if the victim was already dead before the fire started? This would change everything since in that case the medical examiner could not say that the cause of death was asphyxia from the fire but rather that something else must have killed the victim. In the absence of overt trauma or another obvious cause of death, the ME would likely do more complete toxicological testing.

 

How would the ME determine that the victim was dead before the fire? One clue would be the carbon monoxide level in the blood. If this is low, the victim was not breathing while the fire was consuming him. If the carbon monoxide level was high it would indicate that he was breathing and had inhaled carbon monoxide, which comes from the burning of wood and almost any other product. The normal carbon monoxide level is less than 5% but in victims of fire it can be 60 to 90%.

Also, if the victim was still breathing during the fire he would inhale soot and heat. The heat would damage the throat and airways and soot and other fire debris would be inhaled deeply into the lungs. Finding these would indicate the victim was alive while the fire burned and not finding them would suggest a prior death. This latter situation could launch a more complete toxicological analysis of the remains and ultimately lead to the lethal drug. Such testing could take many weeks, even months, so that you can delay the discovery of the true cause of death for almost as long as you need for story purposes.

Rare toxins you might consider would be succinylcholine, PSP (paralytic shellfish poisons), Rohypnol, GHB, and a few others.

 

Q and A: Can My ME Distinguish Death From Asphyxia From Death Due to Head Trauma?

Q: Here’s my book situation: A man puts a plastic bag over his head to kill himself. His wife wakes up next to him (after he nearly strangled her to death and she discovers he’s killed their son) and in her horror and rage cracks him over the head with a blunt object.

Here’s my question: Can the police/coroner/forensics determine which was the cause of death–suffocation or blunt force trauma? If so, what would the signs be pointing to asphyxiation?  Also, if it matters, this is set in 1969.

Judy Merrill Larsen, author of All the Numbers

http://www.judymerrilllarsen.com

A: If the victim died first from the asphyxia, the ME would have no problem since the blow to the head would cause no bruising or bleeding. At death the heart stops and blood flow ceases and a corpse will not bleed or bruise easily. So the ME would see a mark where the victim was struck but no bleeding or bruising and know that the blow was delivered post-mortem.

If he was still alive when struck, things become a little more difficult for the ME but he should still be able to tell. Bruising and bleeding at the site of the blunt trauma would show that the victim was alive when struck but if there is no significant brain injury found at autopsy he would know that the force of the blow did not cause death and the asphyxia must have. If there is a brain injury such as cerebral contusion (brain bruise) or bleeding into or around the brain, he might have difficulty determining the actual cause of death. Of course any evidence of blunt trauma would point to homicide and not suicide since someone using a plastic bag for suicide would not likely also strike themselves in the head.

But I see a bigger problem with your scenario. If she was unconscious from being strangled, she would wake up within 10 seconds to a minute or so after the pressure was released unless she had significant brain injury from lack of oxygen. If she were simply strangled into unconsciousness, which is due to blocking blood flow thru the carotid arteries to the brain and not blocking breathing, as soon as the pressure was released and blood flow reestablished, she would wake up very quickly. Much sooner than he could put a bag on his head and die from asphyxia. For her to be out that long would require some degree of brain injury and I don’t think that’s what you want. Of course, if he drugged her first and then strangled her to the point he thought she was dead, but she in fact wasn’t, then she would awaken when the drug effect wore off. Here he could be dead for hours before she awakened.

 

 
 
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