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Check with your cardiologist again...
A fall in ejection fraction
could be from malfunctioning of the replaced valve or heart failure
At times, unrecognised Coronary artery Disease could be responsible.
Receptor blockers (unlike Angiotensin Converting Enzyme Inhibitors) generally do not cause cough - but may occasionally be responsible.
A second opinion
- from an unbiased observer - may throw some light
Wishing speedy recovery