EKG and Cardiovascular Testing Flashcards
What is the ratio of applied leads to recorded leads on a standard EkG machine?
10:12. A standard EKG machine records 12 leads. For a standard EKG machine, the ratio of applied leads to recorded leads is 10:12.
A provider requests a rhythm strip in addition to regular EKG tracing. Which lead provides the clearest recording of the heart rhythm?
Lead II provides the clearest recording of the heart rhythm and is the standard lead used for a rhythm strip.
What is the standard speed of the recording for EKG?
The assistant should identify that the standard speed for an EKG recording is 25 mm/sec.
An MA notices a widened QRS complex on the EKG. What is a possible caused of the artifact?
An abnormally widened QRS complex should alert the assistant to a ventricular dysrhythmia, such as premature ventricular contraction (PVC). A PVC is caused by an early contraction of the ventricles, which produces a widened QRS complex artifact.
What is true of limb leads and electrodes?
Placed on fleshy areas of the skin, limb leads are bipolar, V1 through V6 are precordial leads that are unipolar. Limb leads are bipolar.The right leg lead wire serves as the ground and helps to avoid artifacts in the EKG recording.
What is sinus bradycardia?
A heart rate of less than 60/min is considered bradycardia. This patient’s cardiac waves are all within the expected reference range, so this is a sinus bradycardia.
What is sinus tachycardia?
Sinus tachycardia is indicated by a heart rate of greater than 100/min.
What is atrial fibrillation?
Atrial fibrillation is an irregular heart rate that does not present as an expected P wave, QRS complex, and T wave configuration on the patient’s EKG tracing.
What is ventricular fibrillation?
Ventricular fibrillation is a state of cardiac dysfunction in which the heart is ineffective in pumping blood and does not provide a consistent heart rhythm. Therefore, it would not present as an expected P wave, QRS complex, and T wave configuration on the patient’s EKG tracing.
What is it called when the EKG is at a state of cellular rest that is represented by a flatline on the EKG strip?
Polarization/ It is the resting state of the myocardial wall, resulting in a flatline or pause on the EKG pattern. This is a normal phase of the EKG cycle and represents a state of cellular rest with a positively charged outside and negatively charged inside.
What does lead 1 record on an ekg?
Records impulses between left and right arms.
What does lead two record on an ekg?
Records impulses between the right arm and the left arm
What does the P wave represent?
Atrial depolarization or contraction.
What does the QRS wave represent
Represents ventricular depolarization or contraction. Atrial repolarization is not visible but incurs during this phase
What does the T wave represent
Represents ventricular repolarization or relaxation
