General cardio Flashcards
Normal T -wave inversion?
V1 and lead III
inversion of T waves LBBB?
V4-V6
inserversion T waves RBBB?
V1-V3
What is stoke adams attack?
Cardiac syncope or bradycardic syncope
Distributive shock?
Decrease in BP due to peripheral vasodilation
What can cause distributive shock?
Rewarming in hypothermia causing peripheral vasodilation and hypotension
Unprovoked PE anticoagulation?
6 months
Provoked PE anticoagulation?
3 months
Part of QRS complex used for synchronisation?
R wave
Why is it important to synchronise the DC cardioversion?
Reduce the risk of ventricular fibrillation
uses of DC cardioversion?
AF, Atrial fibrillation, Supraventricular tachycardia
When is synchronised DC cardioversion used?
This is defibrillation and only in cardiac arrest for shockable rhythms
-Ventricular fibrillation
-pulseless ventricular tachycardia
What does QT interval represnet?
ventricle contraction and relaxation (depolarisation and repolarisation)
What is classed as a prolonged QT interval?
QT>450ms men
QT>460ms women
What causes prolonged QT?
-Genetic
-Medications (those affect potassium channels - antipsychotics, antiarrhythmics, antibiotics, antihistamines)
-Electrolyte imbalance (low potassim, magnesium and calcium)
-Bradycardia
-MI
Symptoms of long QT syndrome?
-Syncope
-Seizures
-Sudden cardiac death
-ALWAYS ASK FAMILY HISTORY
What arrhythmias can prolonged QT cause?
-Torsades de pointes (ventricular tachycardia)
-Sudden cardiac death
Antibiotics to avoid with QT prolongation?
-Macrolides (erythromycin, clarithromycin, azithromycin)
-Fluroquinolones (ending in floxacin)
-Clindamycin
-Fluconazole
-Chloroquine and Hydroxychloroquine
What is pulseless electrical activity?
-Electrical activity seen on the electrocardiogram (ECG) but there is no palpable pulse and the patient is clinically in cardiac arrest
Management of PEA?
- CPR
- Check for reversible causes (H’s and T’s)
- 1mg adrenaline ASAP
-1mg every 3-5 minutes - Thrombolytics drugs (ATEPLASE)
What anti-anginal medication can patients develop a tolerance to?
Nitrates
-Standard-release isosorbide mononitrate - nitrate free time of 10-14 hours (asymmetric dosing interval)
-Not seen in patients who take onse-daily modified release isosorbide mononitrate
What can cause shortened QT interval on ECG?
Hypocalcemia
Aortic reguritation?
-Leaking aortic valve causing blood to flow through back through aortic valve during ventricular diastole
Murmurs in aortic regurgitation?
-Early diastolic soft murmur
-Austin flint heard at apex in severe AS - rumbling murmur