You need your character to unexpectedly drop dead, with no warning. You need a good, plausible medical reason for this to happen.
You’ve come to the right place, evil killer of beloved characters! ::ahemGeorgeRRMartincough::
Note: It might help to review “I ❤ the Lub-Dubber”, the post about the cardiovascular system.
Another note: While you’re reading this, remember that the first priority of a first responder to a medical emergency is their ABCs: Airway, Breathing, and Circulation. This is because the body cannot survive without proper oxygenation. Now, without further ado:
Here are six medical conditions that could cause your character to suddenly drop dead.
What it is: The aorta is the main artery that leads out of the heart. Like all arteries, its walls are made up of multiple layers. Sometimes, a tear occurs in the inner layer. This allows the high-pressure blood in the aorta to push itself in between the layers, “dissecting” the inner layer away from the other layers.
Why the character will die: There are a couple of problems that this can cause. A main one: the flap of the inner layer can cover up the openings to arteries that lead out of the aorta. This can lead to ischemia (oxygen deprivation) of whatever was at the other end of the artery, including the brain or even the heart itself.
Make it plausible: Your character probably has high blood pressure. They might describe a sudden onset of incredibly severe, “tearing” chest pain, which classically radiates to the back.
What it is: A genetic disorder of the heart muscle causes the walls of the left ventricle to get really big and thick. (hyper = over/above, troph = grow, card = heart, myo = muscle, path = feeling/suffering).
Why the character will die: There are a number of ways this can cause problems. (1) In one set of problems, the passage to the aorta (also known as the left ventricular outflow tract) gets blocked by the oversized walls of the left ventricle. No blood gets out of the heart, and therefore nothing in the body can get oxygen. This may happen when they’re at rest, but more often happens when they’re exercising. (2) The electrical system of the heart may be out of whack; that would make it prone to arrhythmias. (See the section on Cardiac Arrhythmia) (3) The heart muscle itself could be less-than-functional: either it doesn’t pump well, or it’s bad at relaxing so it can’t fill up after it pumps.
Make it plausible: Your character is a young, fit athlete. He or she suddenly drops dead while exercising. A member of their family (a parent, for example) may have died suddenly due to the same reason.
Massive Pulmonary Embolism:
What it is: Something blocks off the circulation of blood into the lungs. (Pulmonary = lungs; Embolism = the blockage of a blood vessel with some kind of material.) It’s often a blood clot, but it can also be fat, air, or even tumor material.
Why the character will die: The blood will get backed up from the blockage. This causes a severe drop in blood delivery (measured by blood pressure) to the body, with an increase of pressure behind the blockage. This can cause failure of the right heart (which can’t pump against that kind of pressure). No blood oxygenation, and compromised circulation. Bad news.
Make it plausible: Emboli that come from blood clots are often from deep vein thromboses, or clots that form in the deep veins (often of the legs). There are some risk factors which make it more likely that your character may develop a pulmonary embolus. These include recent immobilization, recent surgery, stroke, paralysis, chronic heart disease, and cancer. Your character may be obese, may have high blood pressure, and may be a smoker.
What it is: A disturbance in the electrical pathways in the heart. This can cause the interruption of proper coordinated pumping in the heart muscle; some arrhythmias can lead to sudden death.
Why the character will die: The pumping of the heart muscle becomes uncoordinated. This results in inadequate filling and/or emptying of the chambers of the heart. Which means that the heart can’t properly pump blood out to the rest of the body. Which means the rest of the body doesn’t get any oxygen.
Make it plausible: There are a LOT of reasons why people get arrhythmias. Everything from being born with extra pathways that run the electrical activity of the heart in a circle, to the sequelae (after-effects) of a heart attack, to drug toxicity, to irregularities of ion flow in the cells of the heart. Research is your friend in this case.
Berry Aneurysm, Sub-Arachnoid Hemorrhage:
What it is: One of the blood vessels in the brain, most likely in the Circle of Willis…
…develops an out-pouching called an aneurysm.
Your character may have been born with it, or they may have acquired it at some point during their life. The acquired ones seem to be more likely to cause problems.
Why the character will die: The aneurysm itself probably doesn’t make much trouble…but it runs the risk of bursting, causing a major brain bleed. The resulting bleed is called a sub-arachnoid hemorrhage, after the space that your character bleeds into. Note: I hyphenated “sub-arachnoid” to make it easier to read and understand. (sub = under, and “arachnoid” refers to the arachnoid mater that surrounds the brain tissue.) It’s usually written as “subarachnoid”. Sub-arachnoid hemorrhages are dangerous; around 50% are fatal.
Make it plausible: Your character will likely have high blood pressure, and will probably smoke cigarettes. Your character may also be a heavy drinker. A family member (parent, sibling, grandparent) may also have died suddenly from the same cause, but not always.
Are there any that AREN’T cardiovascular?
Cardiovascular causes do seem to be pretty prominent, don’t they? Strokes, aneurysms, emboli, heart attacks…they all have to do with the heart and blood vessels.
The only non-cardiovascular cause of potentially instant-ish death I can think of off the top of my head is anaphylaxis. Which, um, has a cardiovascular cause of death. ::sigh:: I’ll include it anyway.
What it is: Anaphylaxis is an overwhelming allergic reaction to a triggering factor. The substance can be anything from a bee-sting to a food item to a medication. (I couldn’t find any pictures that satisfied me for this condition; there’s just too much going on to accurately represent it with one image.)
Why the character will die: There are two main problems that may result in death from anaphylaxis. (1) There is a certain balance of where the fluid in your body likes to stay, be it in blood vessels or in the general body tissues. In anaphylaxis, there is a massive shift of fluid out of the blood vessels and into the body tissues. That results in the compromise of the cardiovascular system (can’t escape it, can we?), which endangers the perfusion of oxygen to the brain and tissues. (2) There is a significant amount of tissue swelling involved, and this can extend to the breathing passages. This results in a blockage of the airway. That means that the character will not be able to get enough air into their lungs to properly oxygenate their blood. And you have the same problem.
Make it plausible: A food allergy will often result in airway compromise and respiratory arrest. A venom allergy (beesting, etc.) will often result in cardiovascular compromise. Also, there are some age correlations with triggering factors, though pretty much anyone can react to pretty much anything regardless of age. That said,
–Adolescents and young adults are at most risk of death from food reactions.
–Middle-aged adults are at most risk of death from venom reactions
–Older adults are at most risk of death from drug reactions
Last note today, I promise: Any one of these can be fatal or not, depending on the person and the situation. Sell it how you want to sell it, but make sure you set up the situation properly for plausibility purposes.
Singer, et al. Unruptured Intracranial Aneurysms. UpToDate Online. September 2009. http://www.uptodate.com/online/content/topic.do?topicKey=cva_dise/8216&selectedTitle=1~13&source=search_result
van Gijn, Jan, et al. Subarachnoid Hemorrhage. Lancet; 1/27/2007, Vol. 369 Issue 9558, p306-318
Manning, Warren J. Clinical Manifestations and Diagnosis of Aortic Dissection. September 2009. http://www.uptodate.com/online/content/topic.do?topicKey=vascular/14665&selectedTitle=1~110&source=search_result
Thompson, et al. Overview of Acute Pulmonary Embolism. UpToDate Online. September 2009. http://www.uptodate.com/online/content/topic.do?topicKey=ven_pulm/12962&selectedTitle=1~150&source=search_result
Levy, et al. Arrhythmia Management for the Primary Care Clinician. UpToDate Online. September 2009. http://www.uptodate.com/online/content/topic.do?topicKey=carrhyth/29474&selectedTitle=3~150&source=search_result
Elliot, et al. Diagnosis and Evaluation of Hypertrophic Cardiomyopathy. UpToDate Online. September 2009. http://www.uptodate.com/online/content/topic.do?topicKey=myoperic/7327&selectedTitle=2~150&source=search_result
Bock, S. Allen. Fatal Anaphylaxis. UpToDate Online. September 2009. http://www.uptodate.com/online/content/topic.do?topicKey=anaphyla/5402&selectedTitle=5~150&source=search_result
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