rev Flashcards
What is sinus bradycardia?
When everything is normal except the BPM is low (less than 60)
(brad, so broad, so the spaces between the R waves will be broad)
What is sinus tachycardia?
When everything is normal except the BPM is High (more than 100)
What is the first degree heart block? How do you determine that it is a first degree heart block from the ECG? What are some conditions that cause it?
It is a partial block of the av node which prolonges The PQ interval.
Diagnosis: if the PQ interval is prologned (more than 0.20 s) and there is normal rythem P-QRS-T
Conditions: fibrosis,
Calcium channel blocking drugs
enhanced vagal tone
athletic training.
What are the two types of Second degree heart block?
Mobitz Type I
Mobitz Type II
What is Second degree heart block Mobitz Type I? How do diagnose it from the ECG? What are some conditions that this can be seen in?
It is: Partial block of the av node
Diagnosis:Progressive lengthening of the PR interval until not QRS is generated
conditions: may be seen normally in children, athletes or individuals with elevated vagal tone.
What is a second degree heart block?
Pr interval is over 0.24 seconds, and the pre interval keeps on getting longer and longer after each contraction, until no QRS is generated.
What is Second degree heart block Mobitz Type II? How do diagnose it from the ECG? What are some conditions that this can be seen in?
It is: Partial block of the Bundle of his (bc type II so two branches)
Diagnosis: Sudden loss of QRS, wide QRS (more than 1 small square)
conditions: may be seen normally in children, athletes or individuals with elevated vagal tone.
What is the general treatment for Second degree mobitz type II?
Pacemaker implantation is generally the treatment for this condition
What is Third degree heart block?
- Complete block of AV node or Bundle of His
What is Third degree heart block? How do diagnose it from the ECG?
It is:Complete block of AV node or Bundle of His
Diagnosis: QRS is opposite to t waves, if QRS is positive, t waves will be negative and vice versa. P-P interval is Normal, R-R is short 20-40.
2-4 p waves for every QRS.
Where is the AP of the ventricles generated in Third degree heart block?
Purkinje-his system
What is atrial fibrillation? How do you diagnoss it on the ecg
Re-entry current causes a “jittery” reading on the ECG, no clear p waves, the r-waves are very inconsistent.
What is ventricular fibrillation? How do you diagnoss it on the ecg
it is Re-entry in ventricles
Diagnosis Distinguishable by the total absence of any pattern
What is Regularly regular Rhythm? What is an example?
The R-R intervals are the same for each heartbeat and the rhythm is maintained. (P-QRS-T is the same, even if smth is wrong with one of the parts)
(regular pattern and rhythm)
Example Sinus bradycardia, sinus tachycardia, first degree heart block
What is regulary irregular Rhythm? Example?
Rythm that doesn’t have the same R-R intervals, but has a pattern that repeats.
(P-QRS-T is not consistent, but its inconsistency is repeated )
Time: Second degree heart block
What is irregulary irregular Rhythm? Example?
No pattern, no rhythm
example atrial fibrilation
How do you measure the corrected QT interval using bazett’s formula?
