Abstract
Background & Method: The study was carried out in the Department of Radio diagnosis, Index Medical College, Hospital & Research Centre, Indore, M.P. including 100 chronic bedridden patients with an aim to assess safety of withholding antithrombotic therapy in patients with low or intermediate probability of pulmonary embolism.
 Result: Males represented about 62% of the entire sample. Majority of male patients were in age group 50 and above. Majority (29%) of female patients were of age group of 20 to 40 yrs. On the basis of B-mode sonography and colour Doppler 20% patients were diagnosed to have acute deep vein thrombosis and 12 % patients were diagnosed to have chronic deep vein thrombosis. Out of 100 chronic bedridden patients in the study, 40% were suspected to have deep vein thrombosis on the basis of clinical signs,45% had a positive d-dimer test, 28% were positive on impedence plethysmography. 30% patients were diagnosed to have deep vein thrombosis by B mode sonography and 32% were diagnosed to have deep vein thrombosis by colour Doppler.
 Conclusion: Only 32 patients were positive for deep vein thrombosis out of 100 patients so it is safe to withhold unnecessary anticoagulation therapy in all chronic bed ridden patients because even after 3 month follow up only 1% patients were positive. Impedence plethysmography is less sensitive than ultrasonography and D-dimer test is more sensitive but it lacks specificity so ultrasound and colour Doppler is more sensitive in clinically suspected DVT patients. Ultrasonography and colour Doppler is better predictor of DVT because it is more sensitive and specific, non-invasive, painless, widely available, easy to use, less expensive, no ionizing radiation.
 Keywords: antithrombotic, pulmonary &embolism.
Highlights
Ultrasound uses the impressions of sound waves to assess delicate tissue structures
Majority of male patients were in age group 50 and above
Out of 100 chronic bedridden patients in the study, 40% were suspected to have deep vein thrombosis on the basis of clinical signs,45% had a positive d-dimer test, 28% were positive on impedence plethysmography. 30% patients were diagnosed to have deep vein thrombosis by B mode sonography and 32% were diagnosed to have deep vein thrombosis by colour Doppler
Summary
Ultrasound uses the impressions of sound waves to assess delicate tissue structures. Constant imaging has worked on the utilization of ultrasound with dynamic pictures that are seen instantaneously [1]. B-mode (splendor regulation) imaging uses constant imaging joined with a straight exhibit of transmission shafts to deliver a two dimensional picture This empowers the perception of venous life structures without the utilization of difference media [2]. An inquiry explicitly for separated calf DVT isn't by and large attempted since the proximal lower limit is assessed in the setting of suspected calf DVT. Be that as it may, it is valuable to examine the affectability and explicitness of US for calf DVT since this substance is either treated or followed with sequential noninvasive studies [4]. Ultrasonography is explicit for indicative intense calf vein DVT, and a positive test in this setting can as a rule be depended on[5]
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