Please select the eligibility criteria that correspond to the clinical trial below.
Title: Optimal Prophylactic Method of Venous Thromboembolism for Gastrectomy in Korean Patients
Brief Summary: This study is to define the optimal method of prophylaxis for patients with gastrectomy in Korea and the investigators hypothesized only mechanical method would be enough for preventing VTE on perioperative period.


Options:
A: Inclusion Criteria:

* Age over 40
* Major surgery undergone\*
* High risk of postoperative VTE according to a National guideline\*\*
* 11+ Caprini scores
* Informed consent is given

Exclusion Criteria:

* Acute deep vein thrombosis (DVT) at baseline
* Performed inferior vena cava (IVC) plication or implanted IVC filter
* Regular preoperative anticoagulation
* Postoperative anticoagulation needed at therapeutic doses
* Absence of anticoagulation for more than 5 days after surgery
* Coagulopathy (not related to Disseminated intravascular coagulation syndrome)
* Thrombocytopenia
* Hemorrhagic diathesis
* Lower limb soft tissue infection
* Ankle-brachial index \< 0.6

  * Major surgery - intervention under endotracheal anesthesia with duration of more than 60 min.

    * In accordance with a standard stratification system, high risk of VTE group includes patients over 60 years old after major surgery and patients 40-60 years old with additional risk factors after major surgery.
B: Inclusion Criteria:

* Male and female patients aged 18 years or above
* Patients scheduled for elective total hip replacement

Exclusion Criteria:

* Planned, staged total bilateral hip replacement
* Active bleeding or high risk of bleeding contraindicating treatment with low molecular weight heparin
* Contraindication listed in the labeling or conditions precluding patient treatment with enoxaparin
* Conditions prohibiting bilateral venography (e.g. amputation of one leg, allergy to contrast media)
C: Inclusion Criteria:

* Patients diagnosed as gastric cancer
* Elective and curative under general anesthesia
* ECOG score 0-2
* ASA score 3 or less than 3
* Informed consents

Exclusion Criteria:

* 2nd primary cancer
* VTE history within one year
* Anticoagulation history
* Allergic to heparin
* Pregnancy or expected pregnancy
D: INCLUSION CRITERIA

A. Medical-Surgical ICU patients \>14 years old at participating ICU. ICUs that use other age cut-off for adult patients will adhere to their local standard (16 or 18 years) B. Weight \> 45kg C. Expected ICU LOS\> 72hrs D. Eligible for pharmacologic thromboprophylaxis with UFH and LMWH.

EXCLUSION CRITERIA

A. Patient treated with IPC for \> 24 hours in this current ICU admission. B. Patient in the ICU\> 48 hours. C. Patient treated with pharmacologic VTE prophylaxis with medications other than UFH or LMWH.

D. Inability or contraindication to applying IPC to both legs i.Burns in the lower extremities, lacerations, active skin infection, \& ischemic limb in the legs at the site of IPC placement ii. Acute ischemia in the lower extremities iii. Amputated foot or leg on one or two sides iv. Compartment Syndrome v. Severe peripheral arterial disease vi. Vein ligation, gangrene, recent vein grafts, and draining incisions vii. Evidence of bone fracture in lower extremities E. Therapeutic dose of anticoagulation with UFH or LMWH F. Pregnancy G. Limitation of life support, life expectancy \< 7 days or palliative care H. Allergy to the sleeves material I. Patients with Inferior Vena Cava (IVC) Filter

Answer: C