Supine hypotensive syndrome

Causes
the causes for this condition are the following:
Obstruction by deep vein thrombosis or tumors (most commonly renal cell carcinoma)
Compression through external pressure by neighbouring structures or tumors, either by significantly compressing the vein or by promoting thrombosis by causing turbulence by disturbing the blood flow. This is quite common during the third trimester of pregnancy when the uterus compresses the vein in the right side position. Iatrogenic causes may be suspected in patients with a medical history of liver transplantion, vascular catheters, dialysis and other invasive procedures in the vicinity
Budd-Chiari syndrome

Diagnosis
The diagnosis can be made clinically by observing the patient when in the right sided position where you can see multiple dilated veins over abdomen due to collaterals. Ultrasound with Doppler flow measurement may be used to assess the IVC and circulatory system. Treatment
Treatment will vary depending on the cause of the vena cava compression or interruption. Often, treatment includes positional changes, avoidance of supine positioning, especially on the right side. In pregnancy, definitive management of the IVCS is to deliver the baby. In other conditions, medical or surgical treatment to remove or relieve the offending structure will relieve symptoms. Frequency
Epidemiological data is elusive owing to the wide variety of clinical presentation. In the U.S., incidence is estimated to be at 5–10 cases per 100,000 per year. Minor compression of the inferior vena cava during pregnancy is a relatively common occurrence. It is seen most commonly when women lie on their back or right side.
Zenaro in the Czech Republic and Slovakia
Xuzal and Zival in Chile
Cezera, Levosetil, Robenan, and Xyzal in Serbia. Rinozal and Xyzal in Ireland

References
External links
"Levocetirizine". Drug Information Portal. U.S. National Library of Medicine. "Levocetirizine dihydrochloride". Drug Information Portal. U.S. National Library of Medicine.