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1. A covering structure of connective tissue, usually of an elongated part, such as the membrane covering a muscle. 2. An instrument introduced into a vessel during angiographic procedures when multiple catheter changes are anticipated. It facilitates ease of change and decreases morbidity at the puncture site.
PATIENT CARE The sheath introduced into the femoral artery, the preferred vascular access route for percutaneous coronary intervention, is a 4 to 6 French (1.35 to 2 mm) in size. The sheath remains in place after completion of the procedure and removal of the catheter until anticoagulation is reversed or anticoagulants are below peak action. The sheath is connected to high-pressure tubing and a flushing system; manual or automatic flushing keeps the line patent. A stopcock connected to the system permits drawing of blood samples.
Venes, Donald, editor. "Sheath." Taber's Medical Dictionary, 23rd ed., F.A. Davis Company, 2017. Nursing Central, nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/743446/all/sheath_of_Hertwig.
Sheath. In: Venes D, ed. Taber's Medical Dictionary. 23rd ed. F.A. Davis Company; 2017. https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/743446/all/sheath_of_Hertwig. Accessed July 24, 2019.
Sheath. (2017). In Venes, D. (Ed.), Taber's Medical Dictionary. Available from https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/743446/all/sheath_of_Hertwig
Sheath [Internet]. In: Venes D, editors. Taber's Medical Dictionary. F.A. Davis Company; 2017. [cited 2019 July 24]. Available from: https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/743446/all/sheath_of_Hertwig.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC
T1 - sheath
ID - 743446
ED - Venes,Donald,
BT - Taber's Medical Dictionary
UR - https://nursing.unboundmedicine.com/nursingcentral/view/Tabers-Dictionary/743446/all/sheath_of_Hertwig
PB - F.A. Davis Company
ET - 23
DB - Nursing Central
DP - Unbound Medicine