• what happens with conduction signal in type 2 second degree AV block
• how prolonged HV interval looks like
• how to recognise ventricular escape rhythm

WARNING! Let's see if you are ready to rescue the patient when unexpected happens. Be sure that it's more common than you think.

• Measure basic AH and HV and compare it to one from previous Lesson
• Determine CL at which a block occurs
• What is the last signal at His channel during the block

• Prolonged HV interval indicates infrahisian conduction abnormality.
• During the non-conducted P wave both an A as well as an H can be expected on the HIS catheter.
• In such patients you can expect spontaneous or mechanically induced complete AV block.
• 3rd degree AV block can be recognised by A V dissociation (V is independent from A)
• In case of AV block (or any other asystole) an escape rhythm can be observed. Ventricular escape rhythm is characterised by a bright QRS morphology and rate about 40bpm.
• To avoid asystole related symptoms you should start ventricular pacing i.e. RVA. Atrial pacing will not help due to obvious reasons :)