11, 1998 and October 2, 1998 showed findings consistent with PTB, minimal and Cardiomegaly. On account of his ailment, [respondent] filed with the [petitioner] a claim for compensation benefits under PD 626, as amended.  Finding his ailment compensable, he was awarded Temporary Total Disability (TTD) benefits from January 8 to 10, 1998. However, [respondents] claim for compensation benefits on account of his Rheumatic Heart Disease was denied on the ground that the said ailment is not work-connected.  Dissatisfied with the decision, [respondent] requested for the elevation of his case to [the ECC] for review pursuant to Section 5, Rule XVIII of the Rules of PD No. 626, as amended. [ 3 ]   On August 19, 1999, the ECC rendered herein assailed Decision affirming in toto the ruling of the petitioner. The ECC held that Rheumatic Heart Disease is not a compensable ailment under Presidential Decree (P.D.) No. 626, as amended; that the respondent failed to prove by substantial evidence that the risk of contracting the said ailment had been increased by his working conditions; and, that respondent failed to show any causal relation between his ailment and his working conditions.   Respondent appealed to the CA under Rule 43 of the Rules of Court. On February 6, 2001, the CA rendered its Decision, the dispositive portion of which reads:   WHEREFORE, judgment is hereby rendered giving due course to the petition.  The assailed decision of the Employees Compensation Commission datedAugust 19, 1999 is hereby SET ASIDE and another one entered declaring the illness Rheumatic Heart Disease compensable and directing the payment of the claim therefore [sic]. SO ORDERED. [ 4 ]   The CA held that the working conditions exposed the respondent, then Storekeeper I and Archivist II, to chemical hazard, as certified by the Secretary of Health, which lowered his body resistance; that when he transferred to the Maritime Industry Authority and assumed the position of Maritime Safety Inspector/Surveyor, he was likewise