Hypoplastic Posterior Leaflet of the Tricuspid Valve-a Unique Cause of Right Heart Failure.

• TR can be due to either primary or secondary causes. • Primary TR due to congenital hypoplasia of leaflets is rare. • Multimodality imaging is key in identifying the cause of TR.

Delayed Diagnosis of Unilateral Absence of Pulmonary Artery Presenting with Recurrent Bronchopneumonia.

• Unilateral absence of the pulmonary artery (UAPA) is a rare congenital condition. • Patients with UAPA may present initially following recurrent bouts of pneumonia. • Echocardiography remains a useful tool for diagnosis in resource-limited settings.

Effects of Nonionic, Cationic, and Mixed Nonionic-Cationic Surfactants on the Acid-Base Behavior of Phenyl Salicylate.

The effects of Brij 35 micelles, CTABr micelles, and mixed Brij 35-CTABr micelles on the acid-base behavior of phenyl salicylate (PST) have been studied in aqueous solution containing 2% v/v acetonitrile. The apparent pK(b) (pK(app)(b)) of PST is decreased by 1.5 pK units with the increase in [Brij 35] from 0 to 0.