OP ALA, Justice.
The dispositive issue in this case is whether the trial tribunal’s death benefit award is supported by competent evidence showing a causal nexus between the prior on-the-job heart attack and the later episode of death-dealing fibrillation. We answer in the affirmative.
Claimant, the widow of a deceased worker, sought death benefits under the Workers’ Compensation Act.
Her husband died in 1983 after a cardiac pacemaker implant. She attributes her husband’s death to a heart attack which he sustained eleven years earlier.
While employed by Bostick Tank Truck Service [employer], the decedent suffered a compensable heart attack in 1972 and was adjudged to have been rendered totally and permanently disabled. In 1980 he went to work again for a different employer and continued there for over two years. In 1983 the decedent had
chest
pains for which he sought medical attention. A temporary pacemaker was inserted to correct rhythmic disturbances and an intermittently slow heart rate (bradycar-dia). During that procedure, though his heart began fibrillating, he was resuscitated. Soon after the implant of a permanent pacemaker, he again developed fibrillation. This time corrective procedures failed and he died. The trial judge allowed death benefits, and a three-judge review panel adopted the award. The employer now seeks appellate relief.
I
THE CAUSAL NEXUS BETWEEN THE DEATH-DEALING FIBRILLATION EPISODE AND THE PRIOR COM-PENSABLE HEART INJURY
An employer is liable for all “legitimate consequences of a compensable injury.”
Whether the decedent’s death is causally connected with his 1972 cardiac episode is a question of fact that must be established by expert testimony.
Because this court’s range of corrective power is
statutorily confined
to reexamination of law questions, our
sole
task on review is to canvass the record and ascertain whether the award is supported by competent evidence.
We need only look to the claim
ant’s medical proof,
the substantial part of which is in expert testimony given by deposition.
According to the record, the 1972 injury caused damage to the right side of the decedent’s heart. Although no active tissue deterioration had developed from it, and his heart was “damaged as much as it was going to be,” the decedent’s adjudicated heart pathology was shown to have passively as well as actively contributed to the cause of his death. Chest pains (angina) brought the decedent to the hospital, where a diagnosis of bradycardia and rhythmic disturbances called for a pacemaker implant. During this procedure the pacemaker wire irritated the “hyperexcita-ble” tissue surrounding the area of the heart damaged by the prior accidental on-the-job injury. It is that physical contact which induced the fibrillation directly causing decedent’s death.
To a “great extent” death was attributed to the disease process (atheroschlerosis) on the
left
side of the heart. The damage to the right side sustained in 1972, which forced the left side to “work harder,” coupled with the advanced coronary disease, brought about both the angina and brady-cardia. According to the claimant’s medical expert, (a) the prior compensable injury increased the chances of death by 40 to 50 percent and, (b) although the decedent’s preexisting disease process made it “probable” that the pacemaker would be needed even if his heart had not been damaged by the compensable accident of 1972, the death-dealing fibrillation episode probably would not have occurred in the absence of the previous on-the-job heart attack.
When assessed by the standards of proof pronounced in
Oklahoma City v. Schoonover,
the evidence viewed in its totality demonstrates the on-the-job heart attack’s causal nexus with the subsequent death-dealing fibrillation. The latter episode cannot be viewed as a separate, disconnected, independent or supervening cause of death. The chain of causation is not deemed to be legally broken where, as here, the medical proof shows that, but for the prior on-the-job heart attack, fibrillation would not have occurred.
II
THE PROBATIVE EFFECT OF THE CLAIMANT’S EXPERT OPINION
The employer next urges that the claimant’s medical evidence lacks probative value because it is based on the erroneous assumption that the decedent took nitroglycerin medication on a regular basis for several years following his 1972 cardiac episode. This contention presupposes that (a) the witness considered the assumed fact to be material to his opinion and (b) the causal nexus between the 1972 compensa-ble heart injury and the decedent’s death would be deemed broken if the assumed fact had been excluded from the witness’ consideration.
The employer’s contention lacks legal merit for two reasons: (1) no showing has been made either that the allegedly erroneous assumption is false or unfounded, or that the claimant’s medical expert actually considered it to be material to his opinion,
and (2) the employer advances no record-supported argument to show how
the “wrongly” assumed fact is or could have been material or even relevant to the expert’s opinion on causation.
The law does not require the medical history considered by an expert to include
all
the facts the evidence tends to prove. The history assumed by the expert must substantially include those facts which the evidence tends to establish and which are not materially inconsistent with the adduced proof in the record.
The expert’s opinion need only connect decedent’s death to some “extension or enlargement” of the preexisting compen-sable injury.
The duty rests upon the cross-examiner either to elicit from the witness the failure to assume a fact conceded to be material or to show that the omitted fact is indeed indispensable so that its omission from the range of facts to be assumed is fatal to the probative value of the expert's opinion.
This responsibility of the cross-examiner clearly is cast by the Oklahoma Evidence Code
which has abrogated the earlier
common-law requirement
that an expert’s opinion be elicited by
means of a hypothetical question.
Ill
THE EMPLOYER’S FUNDAMENTAL-LAW CLAIM TO
EX LEGE
EXONERATION FROM AFTER-ENACTED BENEFIT RATES
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OP ALA, Justice.
The dispositive issue in this case is whether the trial tribunal’s death benefit award is supported by competent evidence showing a causal nexus between the prior on-the-job heart attack and the later episode of death-dealing fibrillation. We answer in the affirmative.
Claimant, the widow of a deceased worker, sought death benefits under the Workers’ Compensation Act.
Her husband died in 1983 after a cardiac pacemaker implant. She attributes her husband’s death to a heart attack which he sustained eleven years earlier.
While employed by Bostick Tank Truck Service [employer], the decedent suffered a compensable heart attack in 1972 and was adjudged to have been rendered totally and permanently disabled. In 1980 he went to work again for a different employer and continued there for over two years. In 1983 the decedent had
chest
pains for which he sought medical attention. A temporary pacemaker was inserted to correct rhythmic disturbances and an intermittently slow heart rate (bradycar-dia). During that procedure, though his heart began fibrillating, he was resuscitated. Soon after the implant of a permanent pacemaker, he again developed fibrillation. This time corrective procedures failed and he died. The trial judge allowed death benefits, and a three-judge review panel adopted the award. The employer now seeks appellate relief.
I
THE CAUSAL NEXUS BETWEEN THE DEATH-DEALING FIBRILLATION EPISODE AND THE PRIOR COM-PENSABLE HEART INJURY
An employer is liable for all “legitimate consequences of a compensable injury.”
Whether the decedent’s death is causally connected with his 1972 cardiac episode is a question of fact that must be established by expert testimony.
Because this court’s range of corrective power is
statutorily confined
to reexamination of law questions, our
sole
task on review is to canvass the record and ascertain whether the award is supported by competent evidence.
We need only look to the claim
ant’s medical proof,
the substantial part of which is in expert testimony given by deposition.
According to the record, the 1972 injury caused damage to the right side of the decedent’s heart. Although no active tissue deterioration had developed from it, and his heart was “damaged as much as it was going to be,” the decedent’s adjudicated heart pathology was shown to have passively as well as actively contributed to the cause of his death. Chest pains (angina) brought the decedent to the hospital, where a diagnosis of bradycardia and rhythmic disturbances called for a pacemaker implant. During this procedure the pacemaker wire irritated the “hyperexcita-ble” tissue surrounding the area of the heart damaged by the prior accidental on-the-job injury. It is that physical contact which induced the fibrillation directly causing decedent’s death.
To a “great extent” death was attributed to the disease process (atheroschlerosis) on the
left
side of the heart. The damage to the right side sustained in 1972, which forced the left side to “work harder,” coupled with the advanced coronary disease, brought about both the angina and brady-cardia. According to the claimant’s medical expert, (a) the prior compensable injury increased the chances of death by 40 to 50 percent and, (b) although the decedent’s preexisting disease process made it “probable” that the pacemaker would be needed even if his heart had not been damaged by the compensable accident of 1972, the death-dealing fibrillation episode probably would not have occurred in the absence of the previous on-the-job heart attack.
When assessed by the standards of proof pronounced in
Oklahoma City v. Schoonover,
the evidence viewed in its totality demonstrates the on-the-job heart attack’s causal nexus with the subsequent death-dealing fibrillation. The latter episode cannot be viewed as a separate, disconnected, independent or supervening cause of death. The chain of causation is not deemed to be legally broken where, as here, the medical proof shows that, but for the prior on-the-job heart attack, fibrillation would not have occurred.
II
THE PROBATIVE EFFECT OF THE CLAIMANT’S EXPERT OPINION
The employer next urges that the claimant’s medical evidence lacks probative value because it is based on the erroneous assumption that the decedent took nitroglycerin medication on a regular basis for several years following his 1972 cardiac episode. This contention presupposes that (a) the witness considered the assumed fact to be material to his opinion and (b) the causal nexus between the 1972 compensa-ble heart injury and the decedent’s death would be deemed broken if the assumed fact had been excluded from the witness’ consideration.
The employer’s contention lacks legal merit for two reasons: (1) no showing has been made either that the allegedly erroneous assumption is false or unfounded, or that the claimant’s medical expert actually considered it to be material to his opinion,
and (2) the employer advances no record-supported argument to show how
the “wrongly” assumed fact is or could have been material or even relevant to the expert’s opinion on causation.
The law does not require the medical history considered by an expert to include
all
the facts the evidence tends to prove. The history assumed by the expert must substantially include those facts which the evidence tends to establish and which are not materially inconsistent with the adduced proof in the record.
The expert’s opinion need only connect decedent’s death to some “extension or enlargement” of the preexisting compen-sable injury.
The duty rests upon the cross-examiner either to elicit from the witness the failure to assume a fact conceded to be material or to show that the omitted fact is indeed indispensable so that its omission from the range of facts to be assumed is fatal to the probative value of the expert's opinion.
This responsibility of the cross-examiner clearly is cast by the Oklahoma Evidence Code
which has abrogated the earlier
common-law requirement
that an expert’s opinion be elicited by
means of a hypothetical question.
Ill
THE EMPLOYER’S FUNDAMENTAL-LAW CLAIM TO
EX LEGE
EXONERATION FROM AFTER-ENACTED BENEFIT RATES
The employer argues further that the award should he vacated because (1) the trial tribunal failed to calculate benefits in accordance with the compensation rates in effect at the time of the decedent’s 1972 compensable injury and (2) the imposition of an award in accordance with rates enacted
after
the employer’s compensation insurance policy had expired violates several constitutional provisions, particularly Art. II, § 15, Okl. Const.
The quantum of statutory death benefits due a claimant is determined by the law in effect at the time of the worker’s death.
The tendered question— whether this rule violates some fundamental-law principle—is not properly before us, since the employer had failed to preserve it for our review. On its appeal to the three-judge panel of the Workers’ Compensation Court the employer had urged for vacation but a single point—that the award was without evidentiary support. Error not raised before a trial tribunal’s review panel cannot be considered either in this court or in the Court of Appeals.
Moreover, the record is barren of indispensable proof showing the employer’s critical coverage period for the workers’ compensation liability policy in question. The insurer’s incorporation of this documentary material is indeed essential for our consideration of its fundamental-law claim, as the employer’s statutory co-obligor, to an
ex lege
exoneration from after-enacted benefit rates.
The employer’s remaining argument— that the award contravenes the purpose of our compensation laws—also lacks merit. It is premised on an absence of competent evidence linking decedent’s death-dealing fibrillation episode with his prior compensa-ble injury.
The proceedings are free from vitiating legal error and the award is supported by competent evidence.
AWARD SUSTAINED.
DOOLIN, C.J., HARGRAVE, V.C.J., and LAVENDER and ALMA WILSON, JJ., concur;
KAUGER, J., concurs by reason of stare decisis.
HODGES and SIMMS, JJ., dissent.