Exploration of Dyspnea at Non-high Brain Natriuretic Peptide (BNP)

Exclusion Criteria

• •Patient with coronary, valve, hypertrophic, hypertensive, infiltrative, constrictive, or rhythmic, significant and/or progressive heart disease.
• •BMI \> 35 kg/m².
• •Unstable patient (systolic blood pressure \< 90 mmHg, resting pulse \> 100 BPM) or clinically congested (edema of the lower limbs, crackling in the lungs).
• •Patient with Pulmonary function testing (EFR) showing significant respiratory disease (FEV1/ vital capacity (CV) max \< 0.7, total lung capacities (CPT)\< LIN)
• •Chronic renal failure with creatinine clearance \< 30 ml/min (MDRD) or dialysis
• •Patient with anemia (Hb \< 12 g/dl)
• •Patient with hypo or hyperthyroidism on thyreostimulating hormone (TSH) value
• •Patient under justice safeguard measure or guardianship