Most pages on this subject assume the driver is liable. Georgia law gives him a complete defense.
A truck driver heart attack case therefore turns on two questions. Was the blackout foreseeable, and did it actually cause the crash? Both run at the trucking company rather than the man at the wheel.
Below, we explain the defense Georgia recognizes and how it fails. We also cover the records that decide these cases.
Why a Sudden Blackout Is a Complete Defense
Start with the rule the old pages never mention.
Gilbert v. Freeland (Ga. Ct. App. ) states it plainly. A “sudden and unforeseeable loss of consciousness by a driver is a complete defense” to a claim that he negligently lost control.
That rule traces back decades. In Lewis v. Smith, 238 Ga. App. 6 (1999), a driver felt “a sudden rush to his head” and then nothing. He had no history of fainting, and a doctor had found normal vitals two hours earlier. Summary judgment went to him, and the appeals court agreed.
Its home is a statute rather than a common-law doctrine. O.C.G.A. § 1-3-3(3) defines an “act of God” as an accident from causes “which are irresistible or inevitable, such as lightning, storms, perils of the sea, earthquakes, inundations, sudden death, or illness.” The phrase, it adds, “excludes all idea of human agency.”
One label matters here. This is not the sudden emergency doctrine, which excuses a choice made without time to reflect. Nobody unconscious makes a choice, so the two doctrines should never be mixed.
Speak with a Charlotte car accident lawyer and get a free consultation today.
Call (980) 246-2656Who Has to Prove What
Here the burden runs the plaintiff’s way, and that is the opening.
The defense is affirmative. Under Gilbert, an act of God “is an affirmative defense upon which the defendant carries the burden of proof.” A defendant also “may not rely upon an absence of evidence in the record.”
Eatmon v. Weeks (Ga. Ct. App. 2013) fills in that burden. The driver must show the loss of consciousness “produced the accident,” and that it did so “without any contributing negligence.”
Gilbert then shows the defense failing. The driver offered no admissible physician statements, no post-crash medical records, and no history suggesting a blackout. A rear-end impact in slow I-75 traffic, the court held, “did not suggest” one.
What Foreseeability Changes
Foreseeability is where a cardiac case is usually won.
The exception is narrow but decisive. Lewis kills the defense where “by the exercise of ordinary care it was foreseeable to the driver that he might lose consciousness while driving.”
Proof takes a doctor. That same opinion calls it a medical question requiring expert testimony to reasonable probability, not possibility. The plaintiff’s expert there lost by offering only “a small possibility.”
Georgia’s carrier cases show the other outcome. Co-Op Cab Co. v. Arnold, 106 Ga. App. 160 (1962), involved a driver with arterial disease who had already caused one blackout crash and lost his license over it. He drove again on the strength of monthly physician letters.
The verdict for the plaintiff stood. His employer, the court held, had knowledge “sufficient to put them on notice that the driver might again black out.”
A companion case supplies the bridge. Jackson v. Co-Op Cab Co., 102 Ga. App. 688 (1960), holds that “ignorance of a fact due to negligence shall be held equivalent to knowledge.”
Candor about the defense side helps too. Battey v. Savannah Transit Authority, 123 Ga. App. 685 (1971), gave a bus company a directed verdict. There was “no evidence that the defendant bus company had any knowledge of the driver’s high blood pressure.”
Read what that turned on, though. Missing knowledge is precisely what discovery exists to find, and Battey predates the National Registry and today’s examination forms.
Why Causation Decides the Rest
Now the fight nobody warns families about.
A finding after the wreck proves nothing about the moment before it. Langston v. Allen, 268 Ga. 733 (1997), holds that “[m]ental or physical impairment is never presumed.” Chronology alone, it adds, “is alone insufficient to establish a causal relation.”
The facts repeat constantly. A driver showed an elevated blood sugar after the crash, and her own doctor could not say which caused which. Directed verdict for the plaintiff, affirmed.
Georgia courts also read the wreck itself. In Lewis, a car crossed a center turn lane and struck head-on without swerving, which fit a blackout. A rear-end bump in congestion, by contrast, did not.
For a tractor-trailer, that makes the machine the witness. Engine control module data, braking and steering inputs, lane-departure alerts, and dash-camera footage prove or disprove the defense itself.
One Georgia quirk compounds it. Under O.C.G.A. § 45-16-22(c), an autopsy rests “in the sole discretion of the medical examiner,” so no family should assume the medical question gets answered automatically.
The Two Forms, and Why Only One Is in the File
A documentary detail decides more of these cases than any argument.
Section 391.43 names both forms. Examination results go “on the Medical Examination Report Form, MCSA-5875,” while the card the driver carries is Form MCSA-5876.
Only one sits in the carrier’s file. The 5876 is a single page certifying the driver passed, and it says nothing about why.
Everything useful is on the other one. Blood pressure, cardiac history, a prior heart attack, medications, and the examiner’s reasoning all appear on the 5875 — which stays with the examiner.
Retention makes this urgent. Each completed report “must be retained on file at the office of the medical examiner for at least 3 years from the date of examination.”
Do the arithmetic. Certification runs up to 24 months, so the exam that cleared a driver can vanish right around the two-year filing deadline. A preservation letter to the examiner belongs in the first week.
Where the Company’s Own Exposure Sits
Blaming only the driver misses the stronger claim.
Section 391.11(a) uses a telling verb. A motor carrier “shall not require or permit a person to drive a commercial motor vehicle unless that person is qualified.” Permitting is enough, so nobody has to order the trip.
The cardiac standard is diagnosis-based. Under § 391.41(b)(4), a driver cannot certify with a “current clinical diagnosis of myocardial infarction, angina pectoris, coronary insufficiency, thrombosis,” or related disease “known to be accompanied by syncope, dyspnea, collapse, or congestive cardiac failure.”
FMCSA’s own cardiologists went further. Its 2002 Cardiovascular Advisory Panel recommended disqualification “for at least the first two months” after a heart attack, an exercise tolerance test “four to six weeks post MI,” and annual recertification. Those are recommendations rather than rules, yet an examiner who ignored them has explaining to do.
Interim diagnoses count as well. Section 391.45(g) requires a new examination for any driver “whose ability to perform his or her normal duties has been impaired by a physical or mental injury or disease.”
No federal rule orders a driver to report a new cardiac diagnosis. The effect is structural instead: an impaired driver is an uncertified one, and § 391.41(a) then forbids him to operate.
Georgia turns all of it into state law. Under O.C.G.A. § 40-1-8(h)(1), a motor carrier “shall comply” with the safety standards in 49 CFR Part 391.
Whether the company answers when the driver’s own defense succeeds remains an argument rather than settled law. Even so, Quynn v. Hulsey, 310 Ga. 473 (2020), holds that claims against an employer are “divisible” from claims against its employee. Certifying and dispatching a driver is human agency, and it happened long before anyone lost consciousness.
What Truck Driver Heart Attack Research Shows
Four risk factors appeared on the old page with no source behind any of them. Two do not survive checking.
The strongest findings are real. A 2010 federal survey of long-haul drivers put obesity at 69 percent against 31 percent of working adults, and current smoking at 51 percent against 19 percent.
Clustering tells the story better. Fully 88 percent carried at least one of high blood pressure, smoking or obesity, against 54 percent of workers. Some 9 percent carried all three, against 2 percent.
Two implied claims fail, though. That same survey found no meaningful gap in high blood pressure, and drivers reported less diagnosed heart disease than other workers.
One measure does hold up. A study using 2009 through 2012 data put metabolic syndrome at 52.4 percent among drivers against 19.4 percent, roughly 2.7 times higher.
The stimulant claim has no support at all. No primary source links stimulant use by commercial drivers to cardiac events.
Mortality is the sounder measure. A cohort of 54,319 trucking employees tracked through 2000 showed ischemic heart disease mortality among drivers 49 percent above expected.
One statistic bridges health and crashes. Drivers in the two highest cardiovascular risk bands showed roughly double the odds of a reportable crash.
Frequency surprises people. Federal data recorded illness or blackout for 34 large-truck drivers in fatal crashes during 2020 — 0.7 percent overall, and 2.1 percent of single-vehicle fatal truck crashes. The 2019 figure matched it, and under-recording is near certain, so treat it as a floor.
What happens next is worse than “losing control.” In a 2025 study of 68 drivers who suffered sudden fatal health problems, 76 percent of them cardiac, every vehicle kept moving and struck something. Research published in 2026 on 138 such crashes found most drivers pressed the accelerator.
Talk to a Tyrone Truck Accident Lawyer
Shane Smith Law subpoenas the examiner’s MCSA-5875 and pulls the engine control module data. We send preservation letters before the three-year retention window closes, because those records decide whether the blackout defense holds. Call (980) 246-2656 for a free consultation.
