Cardio Flashcards
1
Q
Nifedipine
A
Ca++ channel blocker
- block voltage gated L-type Ca++ channels
- cardiac + smooth muscle
- Reduce muscle contractility
-
Vascular smooth muscle *
- vasodilation
- Use:
- HTN
- Angina
- Prinzmetal’s angina
- Raynaud
- prevent vasospam post subarachnoid hemorrage
- Toxicity
- cardiac depression
- AV bock
- Peripheral edema
- Flushing
- Dizziness
- Constipation
2
Q
Verapamil
A
Class IV Antiarr
- Ca++ channel blocker
- block voltage gated L-type Ca++ channels
- cardiac + smooth muscle
- Reuce muscle contractility
- **Cardiac smooth muscle * **
- Decrease heart contractility + rate
- Use:
- HTN
- Angina
- Prinzmetal’s angina
- Raynaud
- Prevent nodal arrhythmias (SVT)
- rate control in a-fib
- Toxicity
- CV:
- bradycardia
- 1st, 2nd, 3rd degree AV block
- Esp if combined with beta blocker!
- Constipation
- Gingival hyperplasia
- Peripheral edema
- Flushing
- Dizziness
*
- CV:
3
Q
Diltiazem
A
Class IV Antiarrhythmic
- MOA
- Ca++ channel blocker
- block voltage gated L-type Ca++ channels
- cardiac + smooth muscle
-
Cardiac smooth muscle
- Reduce muscle contractility
- reduce rate
- increase PR
- increases effective refractory period
- Use:
- HTN
- Angina
- Prinzmetal’s angina
- Raynaud
- Prevent nodal arrhythmias (SVT)
- rate control in A-fib
- prevent vasospasm post subarachnoid hemorrhage
- Toxicity
- CV: CHF, AV block, sinus node depression
- Peripheral edema
- Flushing
- Dizziness
- Constipation
4
Q
Amlodipine
A
Ca++ channel blocker
- block voltage gated L-type Ca++ channels
- Reduce muscle contractility
-
vascular smooth muscle
- vasodilation
- Use
- HTN
- Angina
- Arrhythmias
- Prinzmetal’s angina
- Raynaud
- prevent vasospasm post subarachnoid hemorrhage
- isolated reduction in systolic BP
- Toxicity
- cardiac depression
- AV bock
- Peripheral edema
- Flushing
- Dizziness
- Constipation
5
Q
Hydralazine
A
Vasodilator
- increases cGMP = smooth muscle relaxation
- Vasodilation
- arteries > veins
- decrease afterload
- Use
- severe HTN
- CHF
- HTN in prego (With methylodopa)
- Can give with B-blocker to prevent reflex tachycardia
- Toxcitiy
- compensatory tachycardia
- fluid retention
- nausea
- headache
- angina
- SLE (lupus)
6
Q
Malignant HTN
A
- Nitroprusside
- short acting
- increase cGMP = release NO
- Cyanide toxicity
- Fenoldopam
- dopamine DI receptor agonist
- vasodilation: coronary, peripheral, renal, splanchnic
- decrease BP
- increase natriuresis
- Nitroglycerin + Isosorbide Dinitrate
- vasodilate veins > arteries
7
Q
Nitroglycerine
A
Vasodilate
- Release NO = increase cGMP = decrease intracellular Ca+ = myosin dephosphorylation = smooth muscle relaxation
- Need period without drug in system each day to avoid tolerance
- Vasodilate
- Veins > arteries
- decrease preload
-
Use
- angina
- pulmonary edema
- malignant HTN
- Toxicity
- reflex tachycardia
- hypotension
- flushing, headache
- monday disease = tolerance of vasodilators during work week but loss of tolerance over weekend
- dizziness, headache, tachycardia upon reexposure
8
Q
Isosobide dinitrate
A
Vasodilate
- Release NO = increase cGMP = decrease intracellular Ca+ = myosin dephosphorylation = smooth muscle relaxation
- Need period each day where drug is not in system to avoid tolerance
- Vasodilate
- Veins > arteries
- decrease preload
- Use
- angina
- pulmonary edema
- Toxicity
- reflex tachycardia
- hypotension
- flushing
- headache
- monday disease: tolerance of vasodilators during work week but loss of tolerance during weekend
- tachycardia, dizziness, headache upon reexposure
9
Q
Angina therapy
A
- Reduce myocardial O2 consuption by decreasing
- end diastolic volume
- blood pressure
- heart rate
- contractility
- ejection time
-
Nitrates
- preload
- decrease EDV
- decrease BP
- increase contractility (reflex)
- increase heart rate (reflex)
- decrease ejection time
- decrease MVO2
-
B- blockers
- afterload
- increase EDV
- decrease BP
- decrease contractility
- decrease heart rate
- increase ejection time
- decrease MVO2
-
Together
- no effect on EDV
- decrease BP
- no effect on contractility
- decrease HR
- no effect on ejection time
- decrease MVO2
-
Ca++ channel blocker
- nifedipine = nitrate
- verapamil = b blocker
- Partial Beta blockers
- Pindolol and acebutol = dont use
10
Q
Niacin
(B3)
A
Niacin
- Effect
- Decrease LDL (xx)
- Increase HDL (^^^)
- Decrease triglucerides (x)
- Mechanism
- inhibit VLDL release from hepatocyte
- inhibit lipolysis in adipose tissue
- Toxicity
- Red, flushed face (due to prostaglandins)
- decreased by aspirin
- Hyperglycemia
- acanthos nigricans
- Hyperuricemia
- gout
- Potentiate effects of hypertensive drugs b/c vasodilatory
- Red, flushed face (due to prostaglandins)
11
Q
Cholestyramine
A
Bile acid resin
- Effect
- Decrease LDL (xx)
- Increase HDL (^)
- Increase Triglycerides (^)
- Mechanism
- prevent bile acid reabsorption from intestine
- increase hepatic cholesterol synthesis
- Toxicity
- Most hated by patients
- bad taste
- GI discomfort
- Decrease fat soluble vit absorption
- DAKE
- Cholesterol gallstones
- Most hated by patients
12
Q
Colestipol
A
Bile acid resin
- Effect
- Decrease LDL (xx)
- Increase HDL (^)
- Increase Triglycerides (^)
- Mechanism
- inhibit bile acid reabsorption from intestine
- increase hepatic cholesterol synthesis
- Toxicity
- patients hate
- bad taste
- GI discomfort
- Decreases absorption of fat soluble vit
- DAKE
- Cholesterol gallstones
- patients hate
13
Q
Colesevelam
A
Bile acid resin
- Effects
- Decrease LDL (xx)
- Increase HDL (^)
- Increase Triglycerides (^)
- Mechanism
- Inhibit bile acid reabsorption from gut
- Increase hepatic cholesterol synthesis
- Toxicity
- Patients hate it
- bad taste
- GI discomfort
- Decreases absorption of fat soluble vit
- DAKE
- Cholesterol gallstones
- Patients hate it
14
Q
Ezetimibe
A
Cholesterol absorption blocker
- Effect
- Decreases LDL (xx)
- Mechanism
- prevent cholesterol reabsorption from small intestine
- Toxicity
- Increase LFT (rare)
- Diarrhea
15
Q
Gemfibrozil
A
Fibrate
- Effect
- Decrease LDL (x)
- Increase HDL (^)
- Decrease Triglycerides (xxx)
- Mechanism
-
upregulate lipoprotein lipase (LPL)
- VLDL –> IDL
- increase TG clearance
- increase hepatic cholesterol synthesis*
- Suppresses 7-alpha hydroxylase
- decreased cholesterol –> bile acids
- increased gallstone formation
-
upregulate lipoprotein lipase (LPL)
- Toxicity
- Myositis (muscle inflammation)
- Hepatotoxicity (increase LFT)
- Cholesterol gallstones
16
Q
Clofibrate
Bezafibrate
Fenofibrate
A
Fibrates
- Effect
- Decrease LDL (x)
- Increase HDL (^)
- Decrease Triglycerides (xxx)
- Mechanism
- Upregulate lipoprotein lipase (LPL)
- Increase TG clearance
- Increase hepatic cholesterol synthesis
- Suppress 7-alpha hydroxylase
- decrease cholesterole –> bile conversion
- increase cholesterol gallstones
- Toxicity
- Myositis (muscle inflammation)
- Hepatotoxicity (increase LFT)
- Cholesterol gallstones
17
Q
Digoxin
A
Cardiac Glycoside
- 75% bioavailable
- Urinary excretion
- Antagonised by actions of K+
- Mechanism
- Directly inhibits Na+/K+ ATPase
- indirections inhibits Na+/Ca+ exchanger
- inceases incracellulat Ca++
- Positive ionotropy
- Stimulates CN X
- decrease heart rate
- Increases refractoriness in AV node
- Directly inhibits Na+/K+ ATPase
- Toxicity
- Cholinergic (DUMBBELSS)
- Diarrhea, Urination, Miosis, Bradycardia, Bronchospasm, Excitation of skeletal m and nervous system, Lacrimation, Salivation, Sweating
- Changes in color perception
- occurs with decreased renal function b/c renally cleared
- Cholinergic (DUMBBELSS)
- ECG:
- increase PR
- decrease QT
- ST scooping
- T wave inversion
- Arrythmia
- AV block
- Hyperkalemia (poor prognostic factor)
-
Digitalis induced tachycardia = increased Ca+ = Delayed Afterdepolarization
- most serious and potentially fatal effects
- Factors predisposing to toxicity
- renal failure, hypokalemia, quinidine use
18
Q
Na+ / K+ ATPase
Na+ / Ca+ Exchanger
A
- Na+ / Ka+ ATPase
- Na+ out
- K+ in
- –> decreases intracellular Na+ turning on exchanger
- Na+ / Ca+ Exchanger
- Na+ in
- Ca+ out
19
Q
Quinidine
A
Class 1A antiarrhythmic
- double, quarter, pounder
- Medium Na+ binding strength
- Mechanism
- Na+ block
- preferentially active and inactive channels in pacemaker cells
- K+ block
- Na+ block
- Effect
- Prolong action potential
- increase effective refractory period
- increase QT interval
- Use
- atrial + ventricular arrhythmias
- esp: reentract + ectopic supraventricular and ventricular tachycardias
- Toxicity
- Thrombcytopenia
- Torsades de pointe
- Q: headache, tinnitus