PDE5A and pulmonary arterial hypertension: When measured in cardiac tissues, expression of PDE5A in PAH and WGLL groups was elevated compared to levels detected in Sildenafil and Control groups (PAH: 2.174 ± 0.110 and WGLL: 2.690 ± 0.096 vs. Sildenafil: 1.432 ± 0.139 and Control: 1.410 ± 0.088).