Objective 3: cardiovascular alterations Flashcards
- To provide oxygenated blood and nutrients to vital
organs/tissues. - Without adequate pressure to force perfusion, tissue and
organ injury can result
cardiovascular/peripheral vascular system
what are the measurements for adequate pressure and perfusion?
SBP > 90mm Hg
MAP > 60 mmHg
CK and CK-MB; Troponin T and I; myoglobin - levels rise from heart damage
cardiac biomarkers
cholesterol, triglycerides, lipoproteins (12 hr fast)
lipid profile
helps regulate BP &
fluid volume; increased with heart failure
brain natriuretic peptide
produced in the liver; levels will rise in
response to inflammation
C-ractive protein
amino acid in your blood. You get it mostly
from eating meat. High levels of it are linked to early
development of heart disease
homocysteine
shows electrical currents; detects abnormal rhythms, and
can sometimes detect heart muscle damage
ECG
uses an X-ray machine and a computer to create
3-dimensional pictures of the heart. Sometimes a dye is injected
into a vein so that your heart arteries can be seen as well
cardiac CT scan
client wears a small, portable, battery-powered
ECG machine to record heartbeats over a period of 24 to 48 hours
during normal activities. At the end of the time period, the
information is read and evaluated.
holter monitor
evaluates CV response to stress;
complications can be life threatening. Often done with ECG
cardiac stress testing
treadmill exercise/bicycle to increase HR
exercise stress testing
vasodilating agents are used to
mimic effects of exercise on CV system; used with physically
disabled or deconditioned persons
pharmacologic stress testing
u/s to measure ejection fraction and examine size,
shape & motion of cardiac structures, also its pumping function. Ejection
fraction 60-65% is normal
echocardiogram
uses a small transducer through
mouth into esophagus nearer to the heart. It allows a closer look at the
heart’s structure and function. It also shows any abnormal tissue around
your heart valves, if blood is leaking backward through a valve, and if
blood clots are present in your heart chambers
transesophageal echocardiogram
used to distinguish atrial from ventricular
tachycardias when other methods are inconclusive; serious dysrhythmias
electrophysiologic testing
a small
catheter guided through the large artery in your upper leg, or sometimes
your wrist or arm, into your heart. Dye is given through the catheter and
moving X-ray pictures are made as the dye travels through your heart.
This comprehensive test shows; narrowing in the arteries, heart chamber
size, how well your heart pumps, and how well the valves open and
close, as well as a measurement of the pressures within the heart
chambers and arteries.
cardiac catherization
is the force produced by the volume of
blood in arterial walls
Blood pressure
what is BP an indicator of?
- The ability of arteries to stretch and fill with blood
- The efficiency of the heart as a pump
- The volume of circulating blood
what is BP affected by?
- Age, body size, diet, activity, gender, time of day, emotions,
pain, position and disease. - Fluctuations occur so it is important to obtain several
measurements for comparison
is a chronic condition in which the blood pressure in the
arteries is elevated above normal.
* is a risk factor for coronary heart disease, stroke, peripheral artery disease,
and renal failure.
* Systolic blood pressure equal to or greater than 140 mm Hg and a diastolic
pressure equal to or greater than 90 mm Hg over a sustained period.
* Based on the average of two or more blood pressure measurements taken in
two or more visits with the health care provider after an initial screening
hypertension
Elevated BP that develops during evaluation by medical
personnel –who traditionally have worn white coat. Likely result of anxiety. Clients are
advised to do regular BP check either at home or with assistance and bring record to
physician
white-coat hypertension
what are the 2 types of HTN?
primary
secondary
is HTN with no identifiable cause but
implicated factors include:
* 90-95% of population
* Heredity
* Increased sympathetic neural activity
* Age
primary HTN
has an identifiable underlying cause and is less
common than primary HTN.
* 5-10% of population
secondary HTN
- The rate of the rise of BP is more important than the absolute value in
determining the need for emergency treatment. - Prompt recognition and management is essential to decrease threat to
organ function and life!
hypertensive crises
occurs when
* BP > 180/120 mmHg
* must be treated and lowered immediately to prevent further
damage to organs
hypertensive emergency
is defined as severely elevated
BP with no evidence of target organ damage.
*Develops over days to weeks
*Client requires close monitoring of BP and CV status
*ASSESS FOR POTENTIAL EVIDENCE OF TARGET ORGAN
DAMAGE.
*The blood pressure must be lowered within a few hours
hypertensive urgency
occurs when the major
blood vessels that supply the heart become damaged or
diseased.
* Inflammation and plaque formation in the coronary
arteries is most common cause (atherosclerosis). As this
plaque builds up, the arteries are narrowed which
decreases blood flow.
* If blood flow is compromised enough, angina pectoris
(chest pain) occurs.
* If a full blockage occurs, a myocardial infarction (MI or
heart attack) will occur.
coronary artery disease
- A loss of elasticity and artery hardening that accompanies
the aging process. - Arteries lose elasticity, are more rigid
- arterial vessels fail to stretch causing less O2 rich blood to
be delivered to the organs
arteriosclerosis