CARDIOLOGY, ECG
An ECG machine is a voltmeter (galvanometer). It is used to record the electrical impulses that stimulate the heart. The electrodes record a potential difference. The needle (or pen) of the ECG is deflected a given distance depending on the voltage measured. The ECG...
CARDIOLOGY, ECG
Location of Ischemia or Infarction. The ECG can be used to localize the MI, and sometimes, even predict the infarcted artery. MI Localization by Ed Burns of Life in the Fast Lane. See here. Check out this schematic at LITFL. It breaks down MI localization according to...
CARDIOLOGY, ECG
E.g. The PR segment vs. the PR interval. Segment A segment in an ECG is the region between two waves. PR segment starts at the end of the P wave and ends at the start of the QRS complex. The ST segment starts at the end of the QRS wave and ends at the start of the T...
CARDIOLOGY, ECG
Three Methods to Calculate the Heart Rate When we talk about the heart rate, we often mean the ventricular rate. There are several methods for determining the ventricular rate or heart rate. Below, I share three of them. Method #1: Identify an R-wave that is on a...
CARDIOLOGY, ECG
Right Ventricular...
CARDIOLOGY, ECG
Left Bundle Branch Block (LBBB) Criteria for complete LBBB in adults from the AHA/ACC. QRS ≥ 120 msec (or 110-119 for incomplete BBB) I, aVL, V5-V6: Presence of broad, slurred, monophasic R wave. ± RS in leads V5-V6 in patients with cardiomegaly. I, V5-V6: Absence...
