Fitzgerald, C.J.
We are asked to determine whether the award of workers’ compensation benefits in this case was proper in view of our decision in
Kostamo v Marquette Iron Mining Co,
405 Mich 105; 274 NW2d 411 (1979). We hold that this case was not assessed correctly by the Workers’ Compensation Appeal Board and, therefore, reverse the award.
I
Plaintiff John A. Miklik
was hired by defendant Michigan Special Machine Company in 1953 at age 25. Miklik, a journeyman toolmaker and machinist, first worked for the company as a fixture builder; in 1959 or 1960 he became a "leadoff” man, supervising the construction of machinery.
Miklik also worked as a serviceman for Michigan Special Machine, a job which required him to supervise the installing and servicing of machinery in other plants. This work primarily was confined to the Midwest, although Miklik did travel to Italy and was on assignment in France for several weeks in 1965.
At various times in his life, Miklik apparently was beset with health problems, including scarlet fever, rheumatic heart disease, diabetes, obesity, hypertension, and liver damage. He was absent from his job for several periods from January, 1973, until he left permanently in October, 1974.
Miklik successfully applied for workers’ compensation benefits in 1975. He contended that stress, strain, anxiety, and other incidents of his employment had caused hypertension, and had aggravated and accelerated pre-existing arteriosclerosis and rheumatic heart disease. The hearing referee found Miklik to be permanently and totally disabled. The WCAB affirmed,
and the Court of Appeals denied leave to appeal.
This Court remanded the case to the WCAB for reconsideration in light of
Kostamo.
407 Mich 932. The WCAB affirmed its previous decision,
and the Court of Appeals again denied leave to appeal. This Court granted leave to appeal on November 4, 1981. 412 Mich 856.
II
In all successful workers’ compensation cases, the claimant must establish by a preponderance of the evidence both a personal injury and a relationship between the injury and the workplace. In heart cases, the first question is whether there is heart, damage. The second is whether the heart damage can be linked by sufficient proof to the employment. Only if the first question is answered affirmatively need the second be asked.
The existence of heart damage is, of course, a matter of medical proof. The factfinder in a workers’ compensation case ordinarily is free to accept the most persuasive medical testimony. However, should the medical testimony advance a theory
which conflicts with the law, the factfinder would be precluded from adopting that testimony.
In assessing heart cases, the factfinder is controlled by the syllogistic analysis of the
Kostamo
majority: The Legislature has determined that ordinary diseases of life are not compensable. Arteriosclerosis is an ordinary disease of life. Therefore, arteriosclerosis is not compensable.
Thus, it would be an abuse of a factfinder’s legal discretion to accept medical testimony that a worker with arteriosclerosis and nothing more is a worker with compensable heart damage. Arteriosclerosis is by legal definition an ordinary disease of life; it follows, therefore, that arteriosclerosis is
not
compensable heart damage.
However, even though arteriosclerosis alone does not justify compensation, neither does it bar compensation. Heart damage, such as would result from a heart attack, is compensable if linked by sufficient evidence to the workplace. The availability or unavailability of compensation does not hinge on whether the claimant previously was in excellent health or had a health problem. With respect to eligibility for compensation, the employee with arteriosclerosis, even though more
susceptible to a heart attack, stands on equal footing with the employee who had no earlier cardiovascular difficulties.
The WCAB, upon remand, accepted medical testimony that Miklik’s health problems were job-related, and then found them to be compensable. The board failed to follow
Kostamo’s
direction that in order for there to be compensation there first must be an injury. It is impossible to turn arteriosclerosis into compensable heart damage merely by labeling it so. The board’s opinion, worded in conclusory terms, ignored this premise of
Kostamo.
Testimony, at most, showed the progressive effects of arteriosclerosis, not
separate
heart damage.
In fact, the WCAB, on remand, noted that in its first opinion it had relied on the testimony of Miklik’s medical expert, who said that "work aggravation of the hypertensive arteriosclerotic heart disease caused plaintiff’s disability”. The board later found that Miklik was the victim of heart damage, concluding that "the stressful employment aggravated the pre-existing arteriosclerotic heart condition”. Such a bald assertion completely ignores
Kostamo.
The main issue in two of the five cases which comprised
Kostamo
was whether there had been heart damage. The Court stated that the occurrence or non-occurrence of a heart attack is a purely medical dispute; faced with conflicting expert testimony, the WCAB was compelled to decide the issue. The board concluded that in neither case had a heart attack occurred; thus, there was no heart damage. This Court affirmed and emphasized that absent such "proof’ of heart damage, the
presence of arteriosclerosis alone would not support an award of benefits.
"Although there is a causal relationship between the underlying disability, arteriosclerosis, and [claimants’] inability to continue working, that disability was not caused and could not have been aggravated by their employment.”
Kostamo,
p 118.
Ill
Even if the WCAB had had adequate support for its finding of heart damage in
Miklik,
the board further failed to show a sufficient link between the damage and the workplace. There must be a relationship proved between the damage and
speciñc
incidents or events at work. General conclusions of stress, anxiety, and exertion over a period of time do not satisfy this second requirement. There must be enough detail about that which precipitated the heart damage to enable the factfinder to establish the legal connection by a preponderance of the evidence.
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Fitzgerald, C.J.
We are asked to determine whether the award of workers’ compensation benefits in this case was proper in view of our decision in
Kostamo v Marquette Iron Mining Co,
405 Mich 105; 274 NW2d 411 (1979). We hold that this case was not assessed correctly by the Workers’ Compensation Appeal Board and, therefore, reverse the award.
I
Plaintiff John A. Miklik
was hired by defendant Michigan Special Machine Company in 1953 at age 25. Miklik, a journeyman toolmaker and machinist, first worked for the company as a fixture builder; in 1959 or 1960 he became a "leadoff” man, supervising the construction of machinery.
Miklik also worked as a serviceman for Michigan Special Machine, a job which required him to supervise the installing and servicing of machinery in other plants. This work primarily was confined to the Midwest, although Miklik did travel to Italy and was on assignment in France for several weeks in 1965.
At various times in his life, Miklik apparently was beset with health problems, including scarlet fever, rheumatic heart disease, diabetes, obesity, hypertension, and liver damage. He was absent from his job for several periods from January, 1973, until he left permanently in October, 1974.
Miklik successfully applied for workers’ compensation benefits in 1975. He contended that stress, strain, anxiety, and other incidents of his employment had caused hypertension, and had aggravated and accelerated pre-existing arteriosclerosis and rheumatic heart disease. The hearing referee found Miklik to be permanently and totally disabled. The WCAB affirmed,
and the Court of Appeals denied leave to appeal.
This Court remanded the case to the WCAB for reconsideration in light of
Kostamo.
407 Mich 932. The WCAB affirmed its previous decision,
and the Court of Appeals again denied leave to appeal. This Court granted leave to appeal on November 4, 1981. 412 Mich 856.
II
In all successful workers’ compensation cases, the claimant must establish by a preponderance of the evidence both a personal injury and a relationship between the injury and the workplace. In heart cases, the first question is whether there is heart, damage. The second is whether the heart damage can be linked by sufficient proof to the employment. Only if the first question is answered affirmatively need the second be asked.
The existence of heart damage is, of course, a matter of medical proof. The factfinder in a workers’ compensation case ordinarily is free to accept the most persuasive medical testimony. However, should the medical testimony advance a theory
which conflicts with the law, the factfinder would be precluded from adopting that testimony.
In assessing heart cases, the factfinder is controlled by the syllogistic analysis of the
Kostamo
majority: The Legislature has determined that ordinary diseases of life are not compensable. Arteriosclerosis is an ordinary disease of life. Therefore, arteriosclerosis is not compensable.
Thus, it would be an abuse of a factfinder’s legal discretion to accept medical testimony that a worker with arteriosclerosis and nothing more is a worker with compensable heart damage. Arteriosclerosis is by legal definition an ordinary disease of life; it follows, therefore, that arteriosclerosis is
not
compensable heart damage.
However, even though arteriosclerosis alone does not justify compensation, neither does it bar compensation. Heart damage, such as would result from a heart attack, is compensable if linked by sufficient evidence to the workplace. The availability or unavailability of compensation does not hinge on whether the claimant previously was in excellent health or had a health problem. With respect to eligibility for compensation, the employee with arteriosclerosis, even though more
susceptible to a heart attack, stands on equal footing with the employee who had no earlier cardiovascular difficulties.
The WCAB, upon remand, accepted medical testimony that Miklik’s health problems were job-related, and then found them to be compensable. The board failed to follow
Kostamo’s
direction that in order for there to be compensation there first must be an injury. It is impossible to turn arteriosclerosis into compensable heart damage merely by labeling it so. The board’s opinion, worded in conclusory terms, ignored this premise of
Kostamo.
Testimony, at most, showed the progressive effects of arteriosclerosis, not
separate
heart damage.
In fact, the WCAB, on remand, noted that in its first opinion it had relied on the testimony of Miklik’s medical expert, who said that "work aggravation of the hypertensive arteriosclerotic heart disease caused plaintiff’s disability”. The board later found that Miklik was the victim of heart damage, concluding that "the stressful employment aggravated the pre-existing arteriosclerotic heart condition”. Such a bald assertion completely ignores
Kostamo.
The main issue in two of the five cases which comprised
Kostamo
was whether there had been heart damage. The Court stated that the occurrence or non-occurrence of a heart attack is a purely medical dispute; faced with conflicting expert testimony, the WCAB was compelled to decide the issue. The board concluded that in neither case had a heart attack occurred; thus, there was no heart damage. This Court affirmed and emphasized that absent such "proof’ of heart damage, the
presence of arteriosclerosis alone would not support an award of benefits.
"Although there is a causal relationship between the underlying disability, arteriosclerosis, and [claimants’] inability to continue working, that disability was not caused and could not have been aggravated by their employment.”
Kostamo,
p 118.
Ill
Even if the WCAB had had adequate support for its finding of heart damage in
Miklik,
the board further failed to show a sufficient link between the damage and the workplace. There must be a relationship proved between the damage and
speciñc
incidents or events at work. General conclusions of stress, anxiety, and exertion over a period of time do not satisfy this second requirement. There must be enough detail about that which precipitated the heart damage to enable the factfinder to establish the legal connection by a preponderance of the evidence.
The link between the work and the heart damage need only be one of reasonable relationship of cause and effect. Other possible or probable causes need not be excluded beyond doubt. Further, the work need not be the
sole
cause of the damage; it is sufficient if the employment is
a
cause. The factfinder must identify and evaluate the discrete factors of employment which are connected to the damage. The
Kostamo
Court noted several examples which have been regarded as significant by courts and commentators: temporal proximity of the cardiac episodes to the work experience, hot and dusty conditions, repeated return to work after a cardiac episode, and mental stress.
The WCAB’s conclusion in
Miklik
that general stress existed without a link between a
specific
incident of employment and a
specific
cardiac episode does not suffice. Accordingly, we reverse the decision of the WCAB.
The present Court, while unanimously concurring in this opinion, is equally divided on the question of whether, in light of the reversal of the WCAB, this case should be remanded for further proceedings. Not wishing to affirm the WCAB by such division, a majority of the Court directs that this case be remanded to the WCAB for further proceedings not inconsistent with this opinion.
Kavanagh, Williams, Levin, Coleman, and Ryan, JJ., concurred with Fitzgerald, C.J.
Riley, J., took no part in the decision of this case.