On Doctoring MEDLINE searches, with reference librarian comments

The question was

"Information on the use of low mol.wt.heparin for
treatment of Deep Vein Thrombosis (DVT's) "

1 :  exp *Heparin, low-molecular-weight/tu [Therapeutic Use]         {667}
2 :  Thrombosis/dt [Drug Therapy]         {1487}
3 :  Thromboembolism/dt [Drug Therapy]         {416}
4 :  1 and 3         {46}
5 :  limit 4 to english language         {34}
6 :  limit 5 to human         {34}
7 :  "DEEP VENOUS THROMBOSIS".mp.         {1690}
8 :  7 and 1         {84}
9 :  6 or 8         {108}
10 :  limit 9 to (human and english language)         {86}
11 :  from 10 keep 1-3         {3}
12 :  from 10 keep 2,5,7,13,18,23,30,40,52          {9}

Reference Librarian comments

Great job. You were using MEDLINE nicely. Pulmonary embolism and
thrombophlebitis were other terms you could use, I suppose, but you
got good stuff.