When explaining to a patient why he only had minimal muscle damage following 99% occlusion of the left anterior descending artery, the nurse will explain this is primarily due to
A)
the possibility that the person has elevated INR levels that prevent blood from backlogging in the vessel.
B)
development of collateral circulation that builds channels between some of the smaller arteries usually when the flow is decreased gradually.
C)
good genetic makeup that allows occluded arteries to keep vasodilating to meet metabolic needs.
D)
the release of substances formed by special glands that transport the blood cell-by-cell through smaller spaces.
Ans:
B
Feedback:
Collateral circulation is a mechanism for the long-term regulation of local blood flow. Anastomotic channels exist between some of the smaller arteries. These channels permit perfusion of an area by more than one artery. When the artery becomes occluded, these anastomotic channels increase in size, allowing blood from a patent artery to perfuse the area supplied by the occluded vessel.
You might also like to view...
When performing an examination of skin, hair, and nails, you should enhance your visual inspection by using a magnifying glass and the best source of light, which is
a. daylight. c. incandescent light. b. fluorescent light. d. a flashlight.
You are in the process of designing a patient education program that will provide education and monitoring for patients with hypertension. To support your planning, you draw out and present patient data from:
a. A clinical database. b. Biomedical technologies. c. E-mail. d. Internet sources.
A patient's spouse asks a nurse about hospice. The nurse educates that hospice is
1. A service that provides care to the terminally ill patient only. 2. Warranted when the patient still seeks a cure for his or her terminal illness. 3. A program that focuses on palliative treatment and emotional support. 4. Appropriate when the patient is expected to live for fewer than 9 months.
The nurse is completing the health assessment of a client who is interested in taking oral contraceptives. Which set of data would indicate that the client should consider another form of birth control?
1. Height 5 feet, 7 inches; weight 156 pounds; P-87; R-18; B/P-128/78 2. Height 5 feet, 2 inches; weight 102 pounds; P-80; R-14; B/P-121/74 3. Height 5 feet, 6 inches; weight 140 pounds; P-86; R-16; B/P-112/79 4. Height 5 feet, 3 inches; weight 187 pounds; P-88; R-18; B/P-142/87