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As to what the doctor meant by "heart valve connected to his lung", I can't imagine what that means. I suspect that he/she misspoke, or that you misunderstood.
If you liked the doctor and trust him/her, then return to them for a more complete explanation. A lot of people become so upset upon hearing about any problem, that they are unable to process the explanations offered after the initial diagnosis. If you didn't care for the doctor, or are concerned about his/her expertise, then by all means, seek a second opinion.