Thank you so much!! I understand the ECG of the RBBB, but the ECG of the LBBB seems to me a lot more confusing. Why in RBBB, septal depolarization formed an entire wave (it has a maximum voltage and then comes back to zero), but in LBBB, the septal depolarzation is only a upwards slope (only a line) in V6? I saw somewhere that the rabbit ears are formed by the fact that there are two qrs complexes superimposed?
Very well explained. Just something, I'd like to add to this is the Gates rule of 4 by Dr. Robert Gates. The 1st rule is about cranial nerves. So there are 4 cranial nerves in each brainstem structure. CN 3 and 4 in the midbrain CN 5,6,7,8 in the pons CN 9,10,11, 12 in the medulla. All multiples of 12 are in the midline, so CN 3, 4, 6 and 12 are midline, and they are also, by extension, the only pure motor cranial nerves. Rule 2 All structures starting with M are in the Midline And from posterior to anterior they are MN- Motor nuclei- 3,4,6,12 MLF- Medial longitudinal fasiculus ML- Medial Leminiscus MP- Motor pathway So any midline brainstem lesion, like medial medullary syndrome, will involve these structures. MN- Ipsilateral Cranial nerve lesion MLF- Ipsilateral INO- So inability to adduct ipsilateral eye and nystagmus in the the contralateral eye ML- Contralateral loss of vibrio and proprioreception. MN- Contralateral hemiplegia. Rule 3 All structures starting with S are to the Side or lateral And from posterior to anterior they are Spinocerebellar tract Spinothalamic tract Sensory nucleus of 5th CN Sympathetic neurons The mnemonic is CTVS So any lateral brainstem syndrome will involve Spinocerebellar- contralateral ataxia Spinothalamic- Contralateral loss of pain and temperature CN sensory nucleus Ipsilateral loss of pain and temperature over face. Sympathetic neurons Ipsilateral Horners syndrome. In addition, a lateral pontine lesion will involve- CN 5,7,8 A lateral medullary lesion will involve- CN 9,10,11 A lateral midbrain lesion will have no cranial nerve involvement.
Excellent video! I knew my ECG didn’t look right but I couldn’t understand how to read it. I’ve watched so many videos but this was THE BEST description of ventricular action! I found you finally by learning about tetany. My ECG show obvious hypokalemia.
