1
NR567 Final Exam Study Guide latest update 2026 WITH ALL CASE
STUDIES AND A STUDY GUIDE LATEST LAB FINDINGS ALREADY
GRADED A+
Therapeutic dosing and monitoring of warfarin (Coumadin)
Treatment with warfarin should be initiated with standard doses of 5–10 mg. The initial adjustment of the
prothrombin time takes about 1 week, which usually results in a maintenance dosage of 5–7 mg/d. The
prothrombin time (PT) should be increased to a level representing a reduction of prothrombin activity to 25%
of normal and maintained there for long-term therapy. When the activity is less than 20%, the warfarin dosage
should be reduced or omitted until the activity rises above 20%. Inherited polymorphisms
in 2CYP2C9 and VKORC1 have significant effects on warfarin dosing; however, algorithms incorporating genomic
information to predict initial
warfarin dosing were no better than standard clinical algorithms in two of three large randomized trials
examining this issue. The recommended INR for prophylaxis and treatment of thrombotic disease is 2–3.
Patients with some types of artificial heart valves (eg, tilting disk) or other medical conditions increasing
thrombotic risk have a recommended range of 2.5–3.5.
Types of anticoagulants- mechanisms of action and indications for use
• Vitamin K antagonists.
• Direct Oral Anticoagulants (DOACs)
• Low molecular weight heparins (LMWH)
What is the mechanism of action for anticoagulants?
• Anticoagulants achieve their effect by suppressing the synthesis or function of various clotting factors
that are normally present in the blood. Such drugs are often used to prevent the formation of blood
clots (thrombi) in the veins or arteries or the enlargement of a clot that is circulating in the
bloodstream.
What are the indications for anticoagulants?
• Anticoagulation is an important component of the management strategy for several common medical
conditions. It is indicated for the prevention of recurrent thrombosis in patients with venous
thromboembolism (VTE), which includes deep venous thrombosis and pulmonary embolism, and
ischemic stroke.
,2
Understand Starling’s law
The Frank-Starling Law states that the stroke volume of the left ventricle will increase as the left ventricular
volume increases due to the myocyte stretch causing a more forceful systolic contraction. This assumes that
other factors remain constant.
The Frank–Starling law of the eart (also known as h Starling's law and the
Frank–Starling mechanism) represents the relationship between
stroke volume and end e.[1] T diastolic volum he law states that the
stroke volume of the heart increases in response to an increase in the volume
of blood in the ventricles, before contraction (the end diastolic volume), when
all other factors remain constant. [1] As a larger volume of blood flows
into the ventricle, the blood stretches the cardiac muscle fibers, leading to an increase in the force of
contraction. The Frank-Starling mechanism allows the
cardiac output to be synchronized with the venous return, arterial blood supply and humoral length,[2] without
depending upon external regulation
to make alterations. The physiological importance of the mechanism lies mainly in maintaining left and right
ventricular output equality.
Medications which increase and decrease preload and afterload
For heart failure, ACE inhibitors and ARBs reduce workload on the myocardium by reducing both preload and
afterload.
Preload: When some measure of left ventricular performance such as stroke volume or stroke work is plotted
as a function of left ventricular filling pressure or end-diastolic fiber length, the resulting curve is termed the
left ventricular function curve (Figure 13–4). The ascending limb (<15 mm Hg filling pressure) represents the
, 3
classic Frank-Starling relation described in physiology texts. Beyond approximately 15 mm Hg, there is a
plateau of performance. Preloads greater than 20–25 mm Hg result in pulmonary congestion. As noted above,
preload is usually increased in heart failure because of increased blood volume and venous tone. Because the
function curve of the failing heart is lower, the plateau is reached at much lower values of stroke work or
output. Increased fiber length or filling pressure increases oxygen demand in the myocardium, as described in
Chapter 12. Reduction of high filling pressure is the goal of salt restriction and diuretic therapy in heart failure.
Venodilator drugs (eg, nitroglycerin) also reduce preload by redistributing blood away from the chest into
peripheral veins.
Afterload: Afterload is the resistance against which the heart must pump blood and is represented by aortic
impedance and systemic vascular resistance. As noted in Figure 13–2, as cardiac output falls in chronic failure,
a reflex increase in systemic vascular resistance occurs, mediated in part by increased sympathetic outflow and
circulating catecholamines and in part by activation of the reninangiotensin system. Endothelin, a potent
vasoconstrictor peptide, is also involved. This sets the stage for the use of drugs that reduce arteriolar tone in
heart failure.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Antidote therapies for benzodiazepines
Flumazenil is approved for use in reversing the CNS depressant effects of benzodiazepine overdose and to
hasten recovery following use of these drugs in anesthetic and diagnostic procedures. Although the drug
reverses the sedative effects of benzodiazepines, antagonism of benzodiazepineinduced respiratory depression
is less predictable. When given intravenously, flumazenil acts rapidly but has a short half-life (0.7– 1.3 hours)
due to rapid hepatic clearance. Because all benzodiazepines have a longer duration of action than flumazenil,
sedation commonly recurs, requiring repeated administration of the antagonist.
Adverse effects of flumazenil include agitation, confusion, dizziness, and nausea. Flumazenil may cause a
severe precipitated abstinence syndrome in patients who have developed physiologic benzodiazepine
dependence. In patients who have ingested benzodiazepines with tricyclic antidepressants, seizures and
cardiac arrhythmias may follow flumazenil administration.
Antiarrhythmic drug classes-mechanisms of action, , side and be able to identify by
indications for use effects, name
Antiarrhythmic drug classes:
• Class I - Sodium-channel blockers.
• Class II - Beta-blockers.
• Class III - Potassium-channel blockers.
• Class IV - Calcium-channel blockers.
NR567 Final Exam Study Guide latest update 2026 WITH ALL CASE
STUDIES AND A STUDY GUIDE LATEST LAB FINDINGS ALREADY
GRADED A+
Therapeutic dosing and monitoring of warfarin (Coumadin)
Treatment with warfarin should be initiated with standard doses of 5–10 mg. The initial adjustment of the
prothrombin time takes about 1 week, which usually results in a maintenance dosage of 5–7 mg/d. The
prothrombin time (PT) should be increased to a level representing a reduction of prothrombin activity to 25%
of normal and maintained there for long-term therapy. When the activity is less than 20%, the warfarin dosage
should be reduced or omitted until the activity rises above 20%. Inherited polymorphisms
in 2CYP2C9 and VKORC1 have significant effects on warfarin dosing; however, algorithms incorporating genomic
information to predict initial
warfarin dosing were no better than standard clinical algorithms in two of three large randomized trials
examining this issue. The recommended INR for prophylaxis and treatment of thrombotic disease is 2–3.
Patients with some types of artificial heart valves (eg, tilting disk) or other medical conditions increasing
thrombotic risk have a recommended range of 2.5–3.5.
Types of anticoagulants- mechanisms of action and indications for use
• Vitamin K antagonists.
• Direct Oral Anticoagulants (DOACs)
• Low molecular weight heparins (LMWH)
What is the mechanism of action for anticoagulants?
• Anticoagulants achieve their effect by suppressing the synthesis or function of various clotting factors
that are normally present in the blood. Such drugs are often used to prevent the formation of blood
clots (thrombi) in the veins or arteries or the enlargement of a clot that is circulating in the
bloodstream.
What are the indications for anticoagulants?
• Anticoagulation is an important component of the management strategy for several common medical
conditions. It is indicated for the prevention of recurrent thrombosis in patients with venous
thromboembolism (VTE), which includes deep venous thrombosis and pulmonary embolism, and
ischemic stroke.
,2
Understand Starling’s law
The Frank-Starling Law states that the stroke volume of the left ventricle will increase as the left ventricular
volume increases due to the myocyte stretch causing a more forceful systolic contraction. This assumes that
other factors remain constant.
The Frank–Starling law of the eart (also known as h Starling's law and the
Frank–Starling mechanism) represents the relationship between
stroke volume and end e.[1] T diastolic volum he law states that the
stroke volume of the heart increases in response to an increase in the volume
of blood in the ventricles, before contraction (the end diastolic volume), when
all other factors remain constant. [1] As a larger volume of blood flows
into the ventricle, the blood stretches the cardiac muscle fibers, leading to an increase in the force of
contraction. The Frank-Starling mechanism allows the
cardiac output to be synchronized with the venous return, arterial blood supply and humoral length,[2] without
depending upon external regulation
to make alterations. The physiological importance of the mechanism lies mainly in maintaining left and right
ventricular output equality.
Medications which increase and decrease preload and afterload
For heart failure, ACE inhibitors and ARBs reduce workload on the myocardium by reducing both preload and
afterload.
Preload: When some measure of left ventricular performance such as stroke volume or stroke work is plotted
as a function of left ventricular filling pressure or end-diastolic fiber length, the resulting curve is termed the
left ventricular function curve (Figure 13–4). The ascending limb (<15 mm Hg filling pressure) represents the
, 3
classic Frank-Starling relation described in physiology texts. Beyond approximately 15 mm Hg, there is a
plateau of performance. Preloads greater than 20–25 mm Hg result in pulmonary congestion. As noted above,
preload is usually increased in heart failure because of increased blood volume and venous tone. Because the
function curve of the failing heart is lower, the plateau is reached at much lower values of stroke work or
output. Increased fiber length or filling pressure increases oxygen demand in the myocardium, as described in
Chapter 12. Reduction of high filling pressure is the goal of salt restriction and diuretic therapy in heart failure.
Venodilator drugs (eg, nitroglycerin) also reduce preload by redistributing blood away from the chest into
peripheral veins.
Afterload: Afterload is the resistance against which the heart must pump blood and is represented by aortic
impedance and systemic vascular resistance. As noted in Figure 13–2, as cardiac output falls in chronic failure,
a reflex increase in systemic vascular resistance occurs, mediated in part by increased sympathetic outflow and
circulating catecholamines and in part by activation of the reninangiotensin system. Endothelin, a potent
vasoconstrictor peptide, is also involved. This sets the stage for the use of drugs that reduce arteriolar tone in
heart failure.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Antidote therapies for benzodiazepines
Flumazenil is approved for use in reversing the CNS depressant effects of benzodiazepine overdose and to
hasten recovery following use of these drugs in anesthetic and diagnostic procedures. Although the drug
reverses the sedative effects of benzodiazepines, antagonism of benzodiazepineinduced respiratory depression
is less predictable. When given intravenously, flumazenil acts rapidly but has a short half-life (0.7– 1.3 hours)
due to rapid hepatic clearance. Because all benzodiazepines have a longer duration of action than flumazenil,
sedation commonly recurs, requiring repeated administration of the antagonist.
Adverse effects of flumazenil include agitation, confusion, dizziness, and nausea. Flumazenil may cause a
severe precipitated abstinence syndrome in patients who have developed physiologic benzodiazepine
dependence. In patients who have ingested benzodiazepines with tricyclic antidepressants, seizures and
cardiac arrhythmias may follow flumazenil administration.
Antiarrhythmic drug classes-mechanisms of action, , side and be able to identify by
indications for use effects, name
Antiarrhythmic drug classes:
• Class I - Sodium-channel blockers.
• Class II - Beta-blockers.
• Class III - Potassium-channel blockers.
• Class IV - Calcium-channel blockers.
