Cardiology Flashcards
What must be evaluated in a ECG?
Rate Rhythm Axis Intervals Ischemia/infarction Chamber enlargement
What is considered bradycardia?
HR < 60 bpm
What are the most common causes of sinus bradycardia?
Physical fitness Sick sinus syndrome Drugs Vasovagal attacks Acute MI Increased intracranial pressure
What is considered tachycardia?
HR > 100bpm
What are the most common causes of sinus tachycardia?
Anxiety Anemia Pain Fever Sepsis CHF PE Hypovolemia Thyrotoxicosis CO2 retention Sympathomimetics
What characterizes a sinus rhythm?
P wave (upright in II, III, and aVF; inverted in aVR) preceding every QRS complex and a QRS complex after every P wave
What are the leads used to determine the ECG axis?
Leads I, II, and aVF
What is considered a normal PR interval?
Between 120-200 ms
What can cause a prolonged PR interval?
Delayed AV conduction
What can cause a shortened PR interval?
Fast AV conduction down accessory pathway (e.g., WPW syndrome)
What is considered a normal QRS duration?
Duration < 120ms
How is a left bundle branch block presented in a ECG?
Deep S and no R in V1
Wide, tall, and broad, or notched R wave in I, V5, and V6
What can a new LBBB be sign of?
Acute MI
How is a right bundle branch block presented in a ECG?
RSR’ complex
qR or R morphology with a wide R wave in V1
Wide S wave in I, V5 and V6
What is the duration of a normal corrected QT interval (QT/√RR)?
Between 380-440 ms
What are common causes of prolonged cQT?
Congenital syndromes Long QT syndrome Jervell and Lange-Nielsen syndrome Acute MI Bradycardia Myocarditis Low K, Ca, or Mg Head injury Drugs
What is the Jervell and Lange-Nielsen syndrome?
Long QT syndrome due to defect K conduction, associated with sensorineural deafness
What is the treatment of Jervell and Lange-Nielsen syndrome?
Beta-blockers and pacemaker
What are acute ischemia signs in ECG within hours?
Peaked T waves and ST segment changes
What are acute ischemia signs in ECG within 24 hours?
T wave inversion and ST segment resolution
What are acute ischemia signs in ECG within a few days?
Pathologic Q waves (> 40ms or more than 1/3 of QRS amplitude)
What are the difference of subendocardial infarcts?
ST and T changes without Q waves
What is found in a ECG of a patient with right atrial enlargement?
The P wave amplitude in lead II is > 2.5mm
What is found in a ECG of a patient with left atrial enlargement?
The P wave width in lead II is > 120ms
Termina negative deflection in V1 is > 1mm in amplitude and > 40ms in duration
How a left ventricular hypertrophy can be shown in ECG?
Amplitude of S in V1 + R in V5 or V6 > 35mm
Amplitude of R in aVL + S in V3 > 28mm in men or 20mm in women
How a right ventricular hypertrophy can be shown in ECG?
Right axis deviation
R wave in V1 > 7mm
How to assess if there is jugular venous distention?
JVD > 4cm above the sternal angle
What is the cause of jugular venous distention?
Volume overload
What are common causes of volume overload, which presents as JVD?
Right heart failure
Pulmonary hypertension
What is the hepatojugular reflux?
Distention of neck veins upon applying pressure to the liver
What is the Kussmaul sign?
An increase in jugular venous pressure with inspiration
What is the most common cause of the Kussmaul sign?
Constrictive pericarditis
What are the systolic murmurs?
Aortic stenosis
Mitral regurgitation
Mitral valvev prolapse
Flow murmur
How is the aortic stenosis murmur like?
Harsh systolic ejection murmur that radiates to the carotids
How is the mitral regurgitation murmur like?
Holosystolic murmur that radiates to the axilla
How is the mitral valve prolapse murmur like?
Midsystolic or late systolic murmur with a preceding click
How is the flow murmur murmur like?
Soft murmur that is position-dependent
What are the diastolic murmurs?
Aortic regurgitation
Mitral stenosis
How is the aortic regurgitation murmur like?
An early decreascendo murmur
How is the mitral stenosis murmur like?
Mid to late low-pitched murmur
What is the S3 gallop sign of?
Fluid overload
What are common causes of S3 gallop?
Heart failure
Mitral valve disease
Pregnancy
What is the S4 gallop sign of?
Decreased compliance
What are common causes of S4 gallop?
Hypertension
Aortic stenosis
Diastolic dysfunction
What is the main cause of pulmonary edema?
Left heart failure
What are the most common causes of peripheral edema?
Right heart failure Nephrotic syndrome Hepatic disease Lymphedema Hypoalbuminemia Drugs
What are the main causes of finger clubbing?
Congenital cyanotic heart disease
Endocarditis
What are the main physical exam findings of infective endocarditis?
Splinter hemorrhages
Osler nodes
Janeway lesions
What are Osler nodes?
Painful, red, raised lesions found on the hands and feet
What are Janeway lesions?
Non-tender, small erythematous or haemorrhagic macular, papular or nodular lesions on the palms or soles only a few millimeters in diameter
Which murmurs increase with inspiration?
Right-sided murmurs
Which murmurs increase with expiration?
Left-sided murmurs
What are causes of right axis deviation?
Right ventricular hypertrophy
Anterolateral MI
Left posterior hemiblock
What are causes of left axis deviation?
Ventricular tachycardia
Inferior myocardial infarction
Left ventricular hypertrophy
Left anterior hemiblock
What are causes of increased peripheral pulses?
Compensated aortic regurgitation
Coarctation of aorta
Patent ductus arteriosus
What are causes of decreased peripheral pulses?
Peripheral arterial disease
Late-stage heart failure
What are causes of collapsing (“waterhammer”) peripheral pulses?
Aortic incompetence AV malformations Patent ductus arteriosus Thyrotoxicosis Severe anemia
What is pulsus paradoxus?
Decrease of systolic BP > 10mmHg with inspiration
What are causes of pulsus paradoxus?
Cardiac tamponade Pericardial constriction Obstructive lung diseases Tension pneumothorax Foreign body in airway
What are causes of pulsus alternans?
Cardiomyopathy
Impaired left ventricular systolic function
What is the main cause of pulsus parvus et tardus?
Aortic stenosis
What is the main cause of a jerky peripheral pulse?
Hypertrophic obstructive cardiomyopathy
What are causes of pulsus bisferiens?
Aortic regurgitation
Combined aortic regurgitation and stenosis
Hypertrophic obstructive cardiomyopathy
What drugs can cause sinus bradycardia?
Beta blockers
Calcium channel blockers
What are the signs and symptoms of sinus bradycardia?
Generally asymptomatic
May present as lightheadedness, syncope, chest pain, or hypotension
What are the ECG findings of sinus bradycardia?
Sinus rhythm
HR < 60 bpm
What is the treatment of sinus bradycardia?
If asymptomatic and HR > 40 bpm: none
Atropine if symptomatic or HR < 40 bpm
Pacemaker implant is the definitive treatment
What is the ECG finding of a first-degree AV block?
PR interval > 200ms
What are the causes of a first-degree AV block?
Can occur in normal individuals
Associated with increased vagal tone
Beta-blocker use
CCB use
What are the signs/symptoms of a first-degree AV block?
Asymptomatic
What is the treatment of a first-degree AV block?
None necessary
What is the ECG finding of a second-degree AV block (Mobitz I/Wenckebach)?
Progressive PR lenghtening until a dropped beat occurs; the PR interval then resets
What are the causes of a second-degree AV block (Mobitz I/Wenckebach)?
Drugs effects (Digoxin, Beta-blockers, CCBs)
Increased vagal tone
Right coronary ischemia or infarction
What is the treatment of a second-degree AV block (Mobitz I/Wenckebach)?
None if asymptomatic
Stop the offending drug
Atropine as clinically indicated
What are the signs/symptoms of a second-degree AV block (Mobitz I/Wenckebach)?
Usually asymptomatic
What is the ECG finding of a second-degree AV block (Mobitz II)?
Unexpected dropped beat(s) without a change in PR interval
What are the signs/symptoms of a second-degree AV block (Mobitz II)?
Occasionally syncope
What are the main causes of a second-degree AV block (Mobitz II)?
Results from fibrotic disease of the conduction system or from acute, subacute, or prior MI
To what can a second-degree AV block (Mobitz II) progress to?
A third-degree AV block