
348 Mass. 171 (1964)
202 N.E.2d 822
GINO UBERTO
vs.
MAX KAUFMAN & another.
Supreme Judicial Court of Massachusetts, Suffolk.
November 5, 1964.
December 4, 1964.
Present: WILKINS, C.J., SPALDING, WHITTEMORE, CUTTER, & SPIEGEL, JJ.
Louis Karp for the defendants.
Salvatore Musco, Jr., for the plaintiff.
SPIEGEL, J.
This is an action of tort in which the plaintiff seeks to recover damages for personal injuries which he sustained while working as an employee of the defendants. The defendants were not subscribers under the Workmen's Compensation Act. The jury returned a verdict for the plaintiff. The case is here on the exception of the defendants to the denial of their motion for a directed verdict.
From the evidence most favorable to the plaintiff the jury could have found the following: On the morning of March 14, 1961, the plaintiff, who was over fifty-five years of age, "felt well" and "had no chest pain before he started ... work." He arrived at his place of employment "between 8:15 A.M. and 8:30 A.M.," went to the basement, "and after the performance of various chores," "picked up a bundle of large paper sacks weighing 90 pounds or more." He thereupon suffered a pain in his "lower breastbone area" and "fell down." After drinking some milk he vomited. The pain recurred and he was taken to a hospital where he stayed until June 9, 1961. In July, 1961, he again felt ill, had "chest pain," and was "taken to the Veteran's Hospital ... [where he] remained two days." He subsequently returned "as an out-patient about once a month." "[T]he front and side of his heart" were damaged, and he suffered an "acute anterolateral mycardial infarction." His ability to work has been impaired as a result of this heart condition.
The sole issue before us is whether there was evidence tending to show that the plaintiff sustained an injury arising "out of and in the course of [his] employment." G.L.c. 152, § 66, cl. 4.
At the trial, a heart specialist called by the plaintiff testified, in response to a hypothetical question, that "there is a direct causal relationship between the effort of lifting the *173 bundle of bags and the onset of his acute heart damage." The defendants contend that a variety of "assumptions not established by the evidence" were submitted to the expert witness in the hypothetical question, and that his answer is thus "without probative value." However, the witness had examined the plaintiff a few months after the accident and made a diagnosis at that time which coincided with the diagnosis made at the hospital. Before the hypothetical question was put to the witness, he testified regarding the events and circumstances immediately prior to the occurrence of the plaintiff's heart injury as they were related to him by the plaintiff during the medical examination. Whether such testimony would be admissible as proof of the matters stated had the defendants objected thereto is not in issue. In the case at bar the testimony could properly serve as a basis for an expert opinion. A qualified expert witness may "base his opinion upon facts observed by himself or within his own knowledge and testified to by himself, or upon facts assumed in the questions put to him and supported either by admitted facts or by the testimony of other witnesses already given or to be given at the trial, or upon facts derived partly from one source and partly from the other." Commonwealth v. Russ, 232 Mass. 58, 73. Lovasco v. Parkhurst Marine Ry. 322 Mass. 64, 67. See McCormick, Evidence, §§ 14-15. "The witness possessed special knowledge and the ... [opinion] which he rendered bore relation to the facts which the jury could have found." Commonwealth v. Boyle, 346 Mass. 1, 4. It is apparent from the witness's testimony on cross-examination that his opinion, to the extent that it depended on the weight of the sacks or bundles lifted by the plaintiff, was based on information with regard to which the witness had previously testified. Thus, the hypothetical question put to the witness was not crucial to his expert opinion, and the various assumptions in the question which were not "established by the evidence" are of no significance.
The defendants also argue that "[t]here was no evidence as to the extent to which the plaintiff exerted himself." *174 We do not agree. The evidence regarding the weight of the sacks or bundles lifted by the plaintiff, together with other evidence of his age and physical appearance, is ample indication of the "effort" or "exertion" involved. We think that the expert opinion had sufficient probative value to support a finding that the plaintiff sustained an injury arising "out of and in the course of [his] employment." There was no error in the denial of the defendants' motion for a directed verdict.
Exceptions overruled.
