CVS = Cyclic Vomiting Syndrome, RS = Rumination Syndrome - both present with recurrent vomiting and can be confused. Let me search the library for detailed differentiation.

The user is clarifying that CVS = Cardiovascular System and RS = Respiratory System - they want to differentiate a cardiovascular case from a respiratory case by history. Let me search the library for this.

Excellent - Goldman-Cecil has a dedicated section on "Using the history to detect cardiovascular symptoms." Let me read that alongside the dyspnea section.

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