Body weight may be increased or decreased in subjects diagnosed with pulmonary arterial hypertension (PAH) or chronic thromboembolic hypertension (CTEPH). This alteration is related to the prognosis of the disease. <b>Objective:</b> To identify the prevalence of low or high weight syndrome in subjects with pulmonary hypertension (HP) from 7 hospital centers of the Colombian Pulmonary Hypertension Network. <b>Methods:</b> Sociodemographic and clinical patient study with diagnosis of PAH or CTEPH. Weight and height were included for body mass index calculation (BMI, kg/m2) at diagnosis. Values were categorized according to WHO criteria[1]. Potential association with demographic, functional and outcome variables was evaluated. <b>Results:</b> Weight and height data were available in 371 subjects (47.4%). Weight was affected in 49.1% of patients. Underweight prevalence at diagnosis was 6.5%, obesity 10.8% and overweight 31.8% (Table 1). Underweight subjects were younger (median, 26.3 vs. 41.4-51.1-51.6 years in the other groups), but showed higher PVR (24 uW vs. 11.5 Wood in the others) (Table 2). <b>Conclusion:</b> 49% of HP patients show abnormal weight at the point of diagnosis. Underweight is 2.9 times more frequent than in general population (7% of the total), in association with younger age and greater severity (PVR) of the disease. [1] Underweight (BMI>18.5), Normal Weight (BMI 18.5-24.99), Overweight (BMI 25-29.9) or Obesity (BMI>30).
