486 A.2d 1038 Nicholas Martino, Petitioner v. Workmen’s Compensation Appeal Board (Signal Delivery Service), Respondents. Commonwealth Court of Pennsylvania.Argued December 10, 1984 January 22, 1985. Workmen’s compensation — Heart attack — Causal connection — Medical testimony. 1. In a workmen’s compensation case involving a heart attack, when there is no obvious causal connection between the […]