Cardio Flashcards
What are the 2 different methods of detecting ischemia in an unclear EKG?
Nuclear isotope uptake or ECHO are 2 best methods for detecting ischemia and EQUAL in terms of sensitivity and specificity
Difference between ischemia and infarction on isotope uptake and echo?
Ischemia is decreased perfusion and will be detected by seeing REVERSAL of the decrease uptake or wall motion that will return to normal after a period of rest
Where must you avoid dipyridamole for medication stress test?
Asthmatics; PDE5 inhibitor–> Increase cAMP–>Increase bronchospasm
What is used with nuclear isotope uptake for non-exercise stress test?
Dipyridamole or adenosine
What is used with ECHO for non-exercise stress test?
Dobutamine
Cardiac test workup
Chest pain–> EKG–>Exercise stress test–> If EKG not clear, exercise or medication thallium or echo–>Coronary angiography determines if no catheterization or catheterization (bypass vs angioplasty vs meds alone)
Most accurate test for CAD
Angiography
Management for >70% stenosis on angiography:
1) 1-2 vessel disease
2) 3 vessel disease, left main or 2 vessel disease in diabetics
1) PCI (stent)
2) CABG
What is Holter monitor used for and how long?
Generally 24 hour period and mainly detecting rhythm disorders where it is NOT ACCURATE for evaluating ST segment or ischemia
Chronic stable anginal medications that lower mortality
Aspirin, B-blockers
Difference in Nitroglycerin administration in chronic stable angina vs. ACS (unstable, NSTEMI, STEMI)?
Chronic stable-patch or oral
ACS-sublingual, paste, IV forms
What should patients with ACS receive when arriving to ER?
2 antiplatelet medcations-combination of aspirin and P2Y12 inhibitors (prasugrel, clopidogrel, ticagrelor)
What P2Y12 ihibitor useful when angioplasty and stenting planned?
Prasugrel (best evidence) or ticagrelor (restenosis of stenting best prevented by these two compared to clopidogrel)
When is clopidogrel used?
1) ACS along with aspirin
2) Aspirin intolerance such as allergy
3) Recent angioplasty with stenting (decreases restenosis from stenting but INFERIOR to other 2 antiplatelets)
What population is prasugrel dangerous for?
> 75 b/c of hemorrhagic stroke risk
Use of ticlodipine?
Patient INTOLERANT of both aspirin and clopidogrel
Side effects ticlodipine?
Neutropenia and TTP
Where do ACE inhibitors have best mortality benefit?
Low EF/systolic dysfunction w/ CHF symptoms by decreased preload AND afterload
What can you switch someone to if ACE inhibitor not tolerable for CHF?
Hydralazine (decrease afterload) and nitrates (decrease preload)
When do you use statin?
1) CAD with ANY LDL
2) CAD with LDL>100 and CAD w/ diabetes with LDL>70
What are some CAD equivalents?
PAD, Aortic disease, carotid disease, diabetes, stroke
What drug provides definite mortality benefit for management of hyperlipidemia?
Statin
Niacin use?
Adjunct to statin to decrease LDL. Also, increases HDL and decreases triglycerides
Niacin side effects?
Hyperglycemia (glucose intolerance), Hyperuricemia, pruritis (from histamine release)
Fibrates use?
Help severely decrease triglycerides
Fibrates side effect?
Myositis (especially with statin use)
Bile acid resins (eg cholestyramine) use?
Decrease LDL secondary to decreased bile acid absorption so liver must make more cholesterol to help absorb bile
Bile acid resins side effects?
GI upset (decrease absorption of other drugs and fat soluble vitamins)
Ezetimide use?
Decrease LDL w/o any evidence of actual benefit to patient.
What do you use if you have statin intolerance?
Ezetimibe
Ezetimide side effects?
Rare increase LFT, diarrhea
Do DHP CCB decrease mortality in CAD?
No. Might actually increase mortality from reflex tachycardia leading to increase myocardial oxygen consumption specifically in DHP type
When should you used non-DHP CCB for CAD?
1) Severe asthma precluding use of beta blockers
2) Prinzmental angina
3) Cocaine induced chest pain
4) Inability to control pain with maximum medical therapy
CCB Adverse effects?
Edema, constipation, heart block
Best therapy for ACS?
PCI (angioplasty) provides greatest mortality benefit
What two treatments are equal in chronic stable angina in terms of mortality benefit?
PCI=Maximum medical therapy (aspirin, B-blocker, ACEi, statins)
Two causes of PMI displacement?
1) LVH
2) Dilated cardiomyopathy
V1, V2 leads?
II, III, aVF leads?
V2-V4 leads?
1) Posterior (unique cause ST depression here would be like ST elevation elsewhere–>acute infarction)
2) Inferior
3) Anterior (30-40% mortality) associated with acute MI
What should treatment of PVCs be when associated with acute infarction?
Nothing. Only worsens outcome
Patients with MI should be given aspirin within what time and angioplasty within what time and thrombolytics?
- Aspirin 30 minutes within onset
- Angioplasty (within 90 minutes of entering door)
- Thrombolytics (within 30 minutes of entering door where benefit extends out to 12 hours from onset of chest pain)
Why is ICU monitoring for MI important?
Ventricular arrhythmia common post-MI and rapid performance of electrical cardioversion or defibrillation is available
What are complications of PCI?
1) Restenosis (thrombosis) of vessel after angioplasty
2) Rupture of coronary artery on inflation of the balloon
3) Hematoma at site of entry into the artery (eg femoral area hematoma)
What drugs are used in drug-eluting stent and how does it work?
Drugs-Paclitaxel, siroliumus
MOA: Inhibit local T cell response markedly reducing rate of restenosis
1) Warfarin is for ___
2) Aspirin is for ___
1) Veins
2) Arteries
How is angioplasty superior to thrombolytics?
1) Survival/mortality benefit
2) Fewer hemorrhagic complications
3) Likelihood of developing complications of MI (less arrhythmia, less CHF, fewer septum ruptures, free all (tamponade) and papillary muscles (valve rupture))
Absolute contraindications to thrombolytics? (4)
1) Major bowel bleeding (melena) or brain (any CNS bleed). Heme positive NOT contraindication
2) Surgery in last 2 weeks
3) HTN >180/110
4) Non-hemorrhagic stroke in last 6 months
When is heparinuse good for ACS?
ST depression that helps PREVENT clot forming (best next step after aspirin). LMWH>unfractionated heparin in terms of mortality benefit
When is tPA (thrombolytics) use good for ACS?
STEMI or LBBB that helps BREAK clots
When are GPIIb/IIIa inhibitors used?
NSTEMI who are to undergo angioplasty and stenting
When is urgent angiography and possible angioplasty in NSTEMI ACS indicated?
- Persistent pain
- S3 gallop or CHF developing
- Worse EKG changes or sustained VTACH
- Rising troponin levels
Treatment of symptomatic bradycardias post-MI?
1) Atropine
2) Pacemaker IF atropine ineffective
What areas does RCA serve?
1) RV
2) AV node
3) Inferior wall of heart
Treatment of RV infarction and what should you avoid?
Treat-high-volume fluid replacement
Avoid-Nitroglycerin (worsen cardiac filling)
Treatment of tamponade/free wall rupture?
Emergency pericardiocentesis
How can you tell about valve/septal rupture?
New onset of murmur (either apex (MR) or LLSternalborder(VSD) and pulmonary congestion
Most accurate test for valve and septal rupture?
Echocardiogram
What test can be used to determine septal rupture?
Oxygenation changes from right atrium increasing to right ventricle
What is an intraaortic balloon pump?
Contracts and relaxes in sync with natural heartbeat serving as a bridge to valve or transplant surgery
How do you differentiate 3rd degree AV block vs. sinus bradycardia?
Presence of cannon A waves in 3rd degree AV block
Why do you do post-MI stress test?
Determine those with residual ischemia and have opportunity to determine if angiography is needed for additional reversible revascularization
Do you give prophylactic antiarrhythmics post-MI?
NO. They just increase mortality
What is most common drug to cause ED post-MI
B-blocker; most common cause overall is from anxiety
Does patient have to wait after MI to reengate in sexual activity?
NO may begin immediately
What is MCC of CHF?
Hypertension
What are vast majority (95%) of causes of systolic CHF?
Infarction, cardiomyopathy, and valve disease
What is most accurate test for CHF even though it is rarely done?
Endomyocardial biopsy
Most common presenting sign of CHF?
Dyspnea
What is the significance of S3/S4 gallop?
S3-rapid filling of blood backed up into LV
S4-Atrial systole into stiff or noncompliant ventricle.
What heart sound is present in CHF?
S3 gallop
What is circumoral numbness?
Numbness around mouth. Happens when you lower Ca2+ leading to premature depolarization and feeling of numbness around mouth
Presence of palpitations, syncope
Arrhythmia of almost any kind
Dullness to percussion at bases
Pleural effusion
What is most important test to CHF?
ECHO. Allows for EF evaluation
Best initial test for EF?
Transthoracic echo
Most accurate test for EF?
MUGA (multiple-gated acquisition scan) or Nuclear ventriculography
When should you use nuclear ventriculography?
Patients on chemo with doxorubicin. Need to give max chemo but don’t want to cause cardiomyopathy
When is BNP testing right answer for CHF?
Acute dyspnea with unclear etiology and can’t wait for echo to be done (normal BNP EXCLUDES pulmonary edema)
First line tx. for systolic CHF?
ACE inhibitors
What is MCC death in CHF?
Arrhythmia secondary to ischemia leading to death
What drug has been shown to decrease mortality in addition to ACE inhibitor?
Spironolactone
Adverse effects spironolactone?
Hyperkalemia/gynecomastia
What can you use instead of spironolactone to prevent anti-androgenic effects?
Eplerenone
Do diuretics lower mortality in CHF patients?
No. Spironolactone is technically a diuretic but not used at diuretic doses
Does digoxin lower mortality for CHF patients?
NO. Used to control symptoms of dyspnea and in fact no positive inotrope has been shown to lower mortality.
What drugs provide mortality benefit in systolic dysfunction?
ACE/ARB, B-blocker, Spironolactone/eplerenone, hydralazine/nitrates, implantable defibrillator
What is the indication of an implantable defibrillator?
Ischemic cardiomyopathy and EF
When is biventricular pacemaker indicated?
Dilated cardiomyopathy, EF120 ms
How do you manage diastolic CHF?
B-blockers and diuretics provide clear benefit. Digoxin and spironolactone NOT beneficial. ACE/ARB and hydralazine are uncertain.
What drugs can worsen HOCM?
Diuretics (Decrease preload–> Increase obstruction and worsening symptoms), positive inotropes, vasodilators
What symptom indicates worst, or most severe form of CHF?
Pulmonary edema
Why is hypoxia expected in CHF?
Presence of respiratory alkalosis because of hyperventilation
What is best test to do acutely for pulmonary edema?
EKG (b/c can lead to change in therapy if different underlying cause besides CHF exacerbation as cause like arrhythmias)
Best initial therapy for acute pulmonary edema?
IV furosemide
What other therapies for initial acute pulmonary edema?
Oxygen, morphine, nitrates.
What if initial acute pulmonary edema therapy does not work?
Dobutamine can be used in acute setting (increase contractility and decrease afterload).
Can digoxin be used for acute pulmonary edema in CHF?
NO. Takes several weeks to work and no role in acute setting
What lesions are louder with inhalation/exhalation?
Inhalation-Rt. sided lesions (increased venous return to right side of heart)
Exhalation-Lt. sided lesions (increased blood flow to left side of heart)
Best initial test for valvular heart disease?
Transthoracic echo, with TEE more accurate than TTE
Most accurate test for valvular heart disease?
Catheterization (precise measurement of valvular diameter and exact pressure gradient across valve)
Why will ALL valvular heart disease patients benefit from diuretics?
All of them associated with fluid overloaded state