[CK] NYHA IIIb(more sick than III. h/o resting SOB)

IIIB	NYHA class III patients who are symptomatic with a recent history of dyspnea at rest
Hellgren L, 200242	IIIB	Patients who managed only the lightest of activity without discomfort
Marini C, 200543	IIIB	Advanced heart failure