AF VTE Flashcards
non-dihydropyridine CCBs prescribed for
rate control, prescribed for AF not for HF
Verapamil selective for myocardium – reduce myocardium oxygen demand and act on coronary vasospasm to treat arrhythmia and angina
b. Diltiazem –cardiac depressant and vasodilator, decrease arterial pressure with little of the cardiac stimulation by dihydropyridines
c. Both for AF to improve QOL and exercise tolerance
d. Both avoid in patients with HF due to negative inotropic affects, edema AE
p-value
0.05 less than
function of BB
slow heart rate
Block catecholamines (fight-flight hormones) released by adrenal gland responsible for increasing heart rate and narrowing vasculature
b. Slowing heart rate, acting as vasodilators to widen vessels and allowing the heart to receive more blood and oxygen
c. Often prescribed for HTN, CHD, post-MI, AF
d. Stimulate muscles to constrict air passages (B2) – thus avoid in pts with asthma or bronchospasmic conditions
e. Mask symptoms of hypoglycemia thus avoid in pts with diabetes
normal heart rate
Resting 60 to 100 beats per minute
effect of age on heart rate (specifically on the heart walls thickening and blood vessels stiffening)
As aging progresses: the heart’s walls thicken, decreasing the heart rate both at rest and during activity
embolus
moving thrombus
a. Anything (fat, air, or clot) that journeys through blood vessels until it reaches one that is too small to let it through
b. The medical problem is brings on is called an embolism
c. Thromboembolism refers to a small piece of thrombus that breaks free to roams the circulatory system
ion channels
a. Voltage gated channels that allow ions to pass through (in and out) of the cell for polarization
b. Depolarization: calcium channels allow for influx of calcium ions into cell
c. Repolarization: potassium leaves the cell at resting state
what happens when an electrical impluse re-enters the cardiac muscle
AF
arrhythmia
(Chaotic cycle lead to reentry, circus movement)
causes of AFib
sleep apnea, HTN, MI
are cardiomyopathies structural or functional
functional
sensitivity of lab testing
accuracy of the probability of a positive test given that the patient has disease;
define specificity
probability of a negative test given that the patient is normal; higher the specificity, the fewer normal
people are misdiagnosed as having the disease.
can atrial fib occur in patients with structurally normal hearts
Yes; Individuals with
structurally normal hearts can develop AF, as evidenced by lone AF patients, or the
disease may develop in relation to various CV and other diseases.
mean and median
mean - average
median - middle
AF Paradox
lower incidence of AF with Blacks, an indication that we’re just not able to
ascertain AF as well in certain racial and ethnic groups. Perhaps blacks would have higher rates of AF if more sensitive AF detection methods are used.
normal LVEF
LVEF 50% to 70% is considered
normal.
Coagulation Cascade
either intrinsic: contact activation pathway involving Factors XII, XI, IX, VIII, V,
or extrinsic: tissue factor pathway involving Factor VII
the two pathways converge to produce thrombin
what effect do statins have on AFib
inconclusive
maze surgical incision patterns
curly H
Maze” refers to the series of incisions arranged in a maze-like pattern in the atria
Surgical Ablation
The first open-heart surgical ablation technique for AF – and still the gold standard –
was the Maze procedure, developed in 1987 by James Cox and associates. Also called
the Cox Maze procedure, this cut-and-sew technique was found to effectively restore
sinus rhythm and atrial contraction in patients with intermittent or chronic AF.;
hemorrhagic stroke
occurs when a blood vessel bursts inside the brain
mechanism of warfarin
Vitamin K antagonist;
posterior
directed toward or situated at the back; opposite of anterior
bradycardia
slow heart rate, less than 60 beats per minute
calculation of INR
INR = (PTpatient/PTnormal)^ISI