Preposition: of

• airway: Patency of the upper airway may be difficult to maintain after onset of unconsciousness for the above reasons but intubation is usually not difficult.

• graft: Smoking and the patency of lower extremity bypass grafts: a meta-analysis.

Converse of object

• maintain: Used as part of a planned care regime, OptiFlo helps maintain catheter patency, so the wearer feels refreshed, relaxed and reassured.

• improve: Steroids improve airway patency in croup, haemangioma, lymphoma and some mediastinal masses.

• demonstrate: It was concluded that whenever the HSG demonstrated tubal patency with free flow of dye, laparoscopic may not be necessary.

• show: Ultrasound demonstrated bilateral occlusion with a sensitivity of 100 % , and showed tubal patency with a specificity of 96 % .

Adjective modifier

• tubal: New techniques for the evaluation of tubal patency support the hypothesis that tubal ' plugs ' may be involved in proximal tubal blockage.

• long-term: Bilateral stenting is associated with a better long-term patency.

• venous: RESULTS: Venous patency was restored in 8 patients.

• primary: Primary patency for patients with critical ischaemia was 88, 82 and 74 % at one, 3 and 5 years respectively.

• arterial: Collaborative overview of randomized trials of antiplatelet therapy II: Maintenance of vascular graft or arterial patency by antiplatelet therapy.

• coronary: The effects of tissue plasminogen activator, streptokinase, or both on coronary artery patency, ventricular function and survival after acute myocardial infarction.

Modifies a noun

• rate: Previous treatments have centered on the use of surgical techniques, for which patency rates are well documented.

Noun used with modifier

• graft: He showed that length of survival and graft patency were related to the extent of tissue necrosis at presentation.

• airway: Treatment Currently there is no cure for RRP and management is aimed at maintaining airway patency and adequate voice.

• bypass: The influence of anesthetic method on infrainguinal bypass graft patency: a closer look.

• artery: The effects of tissue plasminogen activator, streptokinase, or both on coronary artery patency, ventricular function and survival after acute myocardial infarction.