Texas Labor Code - LAB § 408.008. Compensability of Heart Attacks

(1) the attack can be identified as:

(2) the preponderance of the medical evidence regarding the attack indicates that the employee's work rather than the natural progression of a preexisting heart condition or disease was a substantial contributing factor of the attack;  and

(3) the attack was not triggered solely by emotional or mental stress factors, unless it was precipitated by a sudden stimulus.