The QRS complex consists of the Q wave, the R wave and the S wave. The QRS complex comes after the P wave when the SA nodal action potential travels through the AV node to the ventricles to cause ...

The diagnosis is normal sinus rhythm, first-degree AV block (prolonged AV conduction), premature ventricular complexes, escape junctional complex, left ventricular hypertrophy with associated ST-T ...

A 90 year old male with no past medical history to clinic with a complaint of generalized weakness, dizziness, and dyspnea on exertion. Mild lower extremity edema, paroxysmal nocturnal dyspnea, and ...

Several hours after admission, he states that he is experiencing palpitations and an ECG is obtained. The initial part of the ...

What caused a patient in their 60s to develop intermittent heart palpitations and periodic weakness? At presentation to the emergency department, the patient said they had not had any significant ...