Cardiovascular Flashcards
What is acute bacterial endocarditis?
infection of normal valves with a virulent organism (S. aureus)
What is subacute bacterial endocarditis?
indolent infection of abnormal valves with less virulent organism (S. viridans)
-Duke’s criteria, staph aureus in acute and IV drug users, and strep viridans in subacute
What is Duke’s criteria?
Major
-blood cultures: S. aureus, S. viridans, S. bovis or other typical species x 2, 12 hours apart
-drug users: staphylococcus, non - drug users: streptococcus
-echocardiogram: vegetations are seen (tricuspid-IV drug users, mitral non-drug users)
-new regurgitant murmur
Minor
-risk factor, fever 100.5, vascular phenomena (splinter hemorrhages, Janeway lesions: painless, palms and soles), immunologic phenomena (Osler node: raised painful tender; Roth spots: exudative lesions on the retina)
What are the classic signs of infective endocarditis?
- Osler’s nodes - tender “ouchy” nodules
- Janeway lesions - painless macules
- Roth spots on the retina
- Splinter hemorrhages on the nail bed
- Clubbing
What is the tx for endocarditis?
- empiric treatment: IV vancomycin or ampicillin/sulbactam PLUS aminoglycoside
- prosthetic valve: Add rifampin
- high-risk patients prophylaxis for procedures: Amoxicillin
What is angina?
chest pain or discomfort, heaviness, pressure, squeezing, tightness that is increased with exertion or emotion
What is stable angina?
predictable, relieved by rest and/or nitroglycerine
- stress test demonstrates reversible wall motion abnormalities/ST depression > 1 mm
- angiography provided a definitive diagnosis
What is the tx of stable angina?
- beta-blockers and nitroglycerin
- severe:angioplasty and bypass
What is unstable angina?
previously stable and predictable symptoms of angina that are now more frequent, increasing or present at rest
- chronic angina - increasing in frequency, duration, or intensity of pain
- new-onset angina - severe and worsening
- angina at rest
What is the tx for unstable angina?
- admit to the unit with continuous cardiac monitoring, establish IV access, O2
- pain control with NTG and morphine
- ASA, clopidogrel, beta-blockers (first line), LMWH
- replace electrolytes
- if the patient responds to medical therapy - stress test to determine if catheterization/revascularization necessary
- reduce risk factors: stop smoking, weight loss, treat DM/HTN
- heparin
What is prinzmetal variant angina?
Coronary artery vasospasms causing transient ST-segment elevations, not associated with clot
- look for a history of smoking (#1 risk factor) or cocaine abuse
- EKG may show inverted U waves, ST-segment or T-wave abnormalities
- preservation of exercise capacity
What is the tx of prinzmetal variant angina?
- stress testing with myocardial perfusion imaging or coronary angiography
- pharmacotherapy SL, topical, or IV nitrates (initial)
- antiplatelet, thrombolytics, statins, BB
- once diagnosis made - CCB and long-acting nitrates used for long-term prophylaxis (amlodipine)
What is the presentation of arrhythmias?
- a condition in which the heart beats with an irregular or abnormal rhythm
- they can come from the atria or from the ventricles
- when they are seen it is imperative to figure out why they are having the arrhythmia and how to treat it
- commonly complain of chest pain or shortness of breath
What is atrial arrhythmias?
premature atrial contractions (these are extra beats from the atria)
What is atrial fibrillation?
an irregular heart rate that at a high rate may cause palpitations, fatigue, and shortness of breath
-It occurs when the upper atrial chambers of the heartbeat out of rhythm and there are multiple atria foci
What is atrial flutter?
an atria with a single foci having multiple P waves before a QRS is produced unlike atrial fibrillation where the P waves are much more chaotic
What is paroxysmal supra ventricular tachycardia?
(PVST) regular, fast (160 to 220 beats per minute) heart rate that begins and ends suddenly and originates in atria
What is accessory pathway tachycardias?
an accessory pathway is an additional electrical conduction pathway between two parts of the heart most common is WPW
- the impulse from the SA node takes an accessory pathway to the AV node and can result in tachycardia
- shorten PR interval
What is AV nodal reentrant tachycardia?
most common type of supra ventricular tachycardia
- occur because of a reentrant circuit (accessory pathway) located in or near the AV node that causes the heart to beat prematurely
- heart rates 100-250 bpm regular rhythm late P waves - may be hidden within the QRS
What is premature ventricular contractions?
(PVCs) (these are extra beats from the ventricles) early wide “bizarre” QRS, no p wave seen
What is ventricular tachycardia (V-tach)?
a type wide QRS complex that is a regular, fast heart rate that arises from improper electrical activity in the ventricles of the heart
- three or more consecutive VPBs, displaying a broad QRS complex tachyarrhythmia
- the rhythm may arise from the working ventricular myocardium, the distal conduction system, or both
- most commonly occurs in patients with structural heart disease, can be associated with an increased risk of sudden death
What is ventricular fibrillation (V-fib)?
the ventricles merely quiver and do not contract in a coordinated way
- no blood is pumped from the heart, very lethal ventricular arrhythmia
- erratic rhythm with no discenable waves (P, QRS, or T waves)
What are the pearls of arrhythmias?
- narrow tachycardia arrhythmias need to be slowed up with entire calcium channel blockers or beta-blockers, adenosine, procainamide, or cardioversion depending on the scenario
- wide tachycardic arrhythmias from the ventricles treat with cardioversion or antiarrhythmics such as amiodarone
What is cardiac tamponade?
a buildup of fluid between the pericardial sac and the heart; constricts the heart
-heart unable to pump normally = blood through through chambers obstructed = cardiac output decreases = hypotension = lower tissue perfusion = heart rate increases
What are the causes of cardiac tamponade?
- acute onset: trauma, myocardial infarction, aortic dissection, pericardial effusion
- slow onset: cancer, chronic inflammation, uremic pericarditis, hypothyroidism, connective tissue disease
What are the 3 D’s of cardiac tamponade?
distant heart sounds, distended jugular veins, and decreased arterial pressure = beck’s triad
What is beck’s triad?
- hypotension
- muffled heart sounds
- elevated necks veins (JVD)
What is pulses paradoxes?
a classic finding (drop 10 mmHg in systolic pressure on inspiration), narrow pulse pressure
- EKG will show electrical alternans (when consecutive, normally-conducted QRS complexes alternate in height) and low voltage QRS complex
- Chest x-ray finding - water-bottle heart (heart-shaped like a canteen)
- treatment: pericardiocentesis
What is the presentation of chest pain?
- most common present with chest pain with shortness of breath, with possible radiation to the neck, jaw, arms, shoulders, and back
- In the ER the workup of a patient with chest pain can include many different etiologies ranging from the benign to the very dangerous
- vital signs should be addressed immediately
- always needed an immediate EKG
- appropriate history and physical exam
How is chest pain diagnosed?
in any acute setting, there are five causes of chest pain that must be considered when assessing a patient
- pericarditis: chest pain that is relieved by sitting and/or leaning forward
- ACS:chest pain with shortness of breath, with possible radiation to the neck, jaw, arms, shoulders, and back
- Pulmonary embolism: dyspnea (most common) and pleuritic chest pain, spiral CT is the best initial test
- Pneumothorax: ipsilateral chest pain and dyspnea with decreased tactile remits, deviated trachea, hyper resonance, diminished breath sounds
- thoracic aneurysm/dissection: severe, tearing (ripping, knife-like) chest pain radiating to the back
What is the typical workup for chest pain?
- EKG
- Troponin I
- BNP
- CXR
- CBC/CMP
can include depending on the situation
- D-dimer (sensitive not specific)
- CT chest (pneumothorax, tumor, etc.)
- CT angiogram of the chest (r/o PE)
- CT aortogram (thoracic aneurysm)
What are the pearls of chest pain?
- ACS or MI (EKG, troponin)
- pericarditis (EKG, ESR)
- CHF (CXR and BNP)
- pneumothorax (CXR and CT)
- PE (D-dimer and CTA)
- thoracic aneurysm (CT aortogram)
What is afib?
irregularly irregular rhythm with disorganized and irregular atrial activations and an absence of P waves
What is a-flutter?
regular, sawtooth pattern and narrow QRS complex
What is supra ventricular tachycardia?
narrow, complex tachycardia, no discernible P waves
What is ventricular tachycardia?
three or more consecutive VPBs, displaying a broad QRS complex tachyarrhythmia
What is premature beats?
- PVC: early wide bizarre QRS, no p wave seen
- PAC: abnormally shaped P wave
- PJC: narrow QRS complex, no p wave or inverted p wave
What is a bundle branch block?
- left: R and R’ (upward bunny ears) in V4-V6
- right: R and R’ (upward bunny ears) in V1-V3
What is non-ST segment elevation?
(NSTEMI, subendocardial MI) is myocardial necrosis (evidence by cardiac markers in the blood; troponin I or troponin T and CK will be elevated) WITHOUT acute ST-segment elevation or Q waves
- ECG changes such as ST-segment depression, T-wave inversion, or both may be present
- coronary artery not completely blocked
- subendocardial infarct
What cardiac markers will be elevated with NSTEMI?
- troponin is most sensitive and specific appears at 2-4 hours, peaks around 12-24 hours and lasts for 7-10 days
- CK/CK-MB appears at 4-6 hours, peaks at 12-24 hours and returns to normal within 48-72 hours
- myoglobin (Mb) is used less than the other markers and appears at 1-4 hours, the peak is 12 hours, and returns to baseline levels within 24 hours
What is the tx of a NSTEMI?
beta blockers + NTG + aspirin and clopidogrel + heparin + ACEI + statins + reperfusion
- reperfusion via percutaneous coronary intervention (not thrombolysis)
- less time-sensitive than in STEMI