5
votes
Accepted
Difference between strength and hypertrophy?
The difference between the two concepts you are talking about is "physiological" versus "pathological" hypertrophy.
Shimizu and Minamino note (2016. PMID 27262674:
Cardiac ...
- 3,080
4
votes
Bradyarrhythmia & Bradycardia- same or different?
Literally translating the terms would say that bradycardia is a "slow heart" and a bradyarrhythmia is a "slow abnormal/irregular (heartbeat)". In many cases they will substantially ...
- 13.7k
3
votes
Augmented lead equations
I think there must be an error somewhere in the Vector Diagram for Lead III.
I believe it should be pointing down-left to 8:00 not up-right to 2:00 as shown up in yellow image below.
(yes it is ...
3
votes
How is adding up action potentials equivalent to measuring the direction of depolarization vectors?
Electrocardiography (ECG)
ECG Leads
Firstly, it is important to clarify that a lead (like lead 2) does not refer to one of the electrodes on the patient. Each lead represents the potential difference ...
- 3,253
3
votes
Accepted
4 Electrode vs 5 Electrode ECG
Wilson leads (normally V1-V6) are so called unipolar leads: that means that 3 extremities' electrodes are put together over a high resistance to a so called "indifferent" electrode, against which you ...
- 709
2
votes
Accepted
Positive deflection of an ECG
The mechanism is depicted in the diagram you posted, most obvious in "A":
ECG (and any voltage measurement) is based on a potential difference
You don't measure the voltage at one spot, you measure ...
- 13.7k
2
votes
How is adding up action potentials equivalent to measuring the direction of depolarization vectors?
As far as I understand, in the vector-cardiogram, the Heart Vector H(t) changes from time to time, and its projection to each induction direction is induction I, II and III. In other words, we have ...
- 475
1
vote
Accepted
How to determine QRS voltage from ECG?
Einthoven’s Law
From ECG and Echo Learning:
This law implies that the sum of the potentials in lead I and lead Ill equals the potentials in lead II. In clinical electrocardiography, this means that ...
- 3,253
1
vote
Reason for ecg volume conduction waveform?
Well,
that's because that's where they are the most different
is exactly right. You have two electrode sites, "blue" and "pink". Voltage is an electrical potential difference.
If ...
- 13.7k
1
vote
Please say what my ecg means
This question violates rules; the only reason I'm answering is because it is normal.
It's got a regular rhythm with a normal rate, an axis around 30º, which is normal.
All segment durations are ...
Only top scored, non community-wiki answers of a minimum length are eligible