ECG
CBC
Chem 10
ECG
On visual inspection, QT takes up more than half the R-R distance
Measure QT interval in lead II or V5-6
QTc = QT /√R-R
On visual inspection, QT takes up more than half the R-R distance
Measure QT interval in lead II or V5-6
QTc = QT /√R-R
Pause Dependent (Acquired)
Drug induced (see drug list above)
Antiarrhythmics
Phenothiazines
TCAs
Organophosphates
Antihistamines
Electrolyte Abnormalities (hypoKalemia, hypoMag, hypoCa)
Hypokalemia triad
Long QT, ST depressions, PVCs
Hypothermia
Diet related (starvation, low protein)
Severe Bradycardia/AV Block
Hypothyroid
Contrast injection
CVA (intraparenchymal)
Elevated intracranial pressure and Intracranial hemorrhage
MI
Adrenergic Dependent
Congenital
Jarvel/Lange-Nielsen
(+deafness; AR)
Romano-Ward syndrome
(normal hearing; AD)
Sporadic
Mitral valve prolapse
Acquired
CVA (subarachnoid)
Autonomic surgery (catechol excess: neck dissection, carotid endarterectomy, truncal vagotomy)
Drug induced (see drug list above)
Antiarrhythmics
Phenothiazines
TCAs
Organophosphates
Antihistamines
Electrolyte Abnormalities (hypoKalemia, hypoMag, hypoCa)
Hypokalemia triad
Long QT, ST depressions, PVCs
Hypothermia
Diet related (starvation, low protein)
Severe Bradycardia/AV Block
Hypothyroid
Contrast injection
CVA (intraparenchymal)
Elevated intracranial pressure and Intracranial hemorrhage
MI
Antiarrhythmics
Phenothiazines
TCAs
Organophosphates
Antihistamines
Hypokalemia triad
Long QT, ST depressions, PVCs
Long QT, ST depressions, PVCs
Congenital
Jarvel/Lange-Nielsen
(+deafness; AR)
Romano-Ward syndrome
(normal hearing; AD)
Sporadic
Mitral valve prolapse
Acquired
CVA (subarachnoid)
Autonomic surgery (catechol excess: neck dissection, carotid endarterectomy, truncal vagotomy)
Jarvel/Lange-Nielsen
(+deafness; AR)
Romano-Ward syndrome
(normal hearing; AD)
Sporadic
Mitral valve prolapse
(+deafness; AR)
(normal hearing; AD)
CVA (subarachnoid)
Autonomic surgery (catechol excess: neck dissection, carotid endarterectomy, truncal vagotomy)
QT prolongation
Cardiovascular-mediated syncope
T wave changes
Dysrhythmias:
ST segment elevation
WPW 
ST segment depression
Long QT Syndrome/QT prolongation