Appendix to Subpart D of Part 410

A miner with pneumoconiosis who meets or met one of the following sets of medical specifications, may be found to be totally disabled due to pneumoconiosis at the pertinent time, in the absence of evidence rebutting such finding:

(1) Arterial oxygen tension at rest (sitting or standing) or during exercise and simultaneously determined arterial PCO₂ equal to, or less than, the values specified in the following table:

or

(2) Cor pulmonale with right-sided congestive failure as evidenced by peripheral edema and liver enlargement, with:

(A) Right ventricular enlargement or outflow tract prominence on X-ray or fluoroscopy; or

(B) ECG showing QRS duration less than 0.12 second and R of 5 mm. or more in V₁ and R/S of 1.0 or more in V₁ and transition zone (decreasing R/S) left of V₁;

or

(3) Congestive heart failure with signs of vascular congestion such as hepatomegaly or peripheral or pulmonary edema, with:

(A) Cardio-thoracic ratio of 55 percent or greater, or equivalent enlargement of the transverse diameter of the heart, as shown on teleroentgenogram (6-foot film); or

(B) Extension of the cardiac shadow (left ventricle) to the vertebral column on lateral chest roentgenogram and total of S in V₁ or V₂ and R in V₅ or V₆ of 35 mm. or more on ECG.