Localisation of the origin of a ventricular tachycardia: Difference between revisions

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[[File:VT_origins.svg|thumb|Areas of the left ventricle where VT's can originate from: The left ventricle is depicted as having been opened. Regionsare as follows: '''AB''': anterobasal; '''AM''': mid anterior; '''AA''' anterior apex; '''SB''': basal septum; '''SM''', midseptum; '''SA''', apical septum; '''PB''': basal posterior; '''PM''': mid posterior; '''PA''': posterior apex. Adapted from Miller et al.<cite>Miller</cite>]]
[[File:VT_origins.svg|thumb|Areas of the left ventricle where VT's can originate from: The left ventricle is depicted as having been opened. Regions are defined as: '''AA''' = antero-apical; '''AB''' = antero-basal; '''AM''' = mid-anterior; '''SA''' = apical septum; '''SB''' = basal-septum; '''SM''' = mid-septum; '''IA''' = inferior apex; '''IB''' = inferior-basal; '''IM''' = mid-inferior. '''Posterior / lateral''' is located on the part between anterior and inferior. Adapted from Miller et al.<cite>Miller</cite>]]
 
 
The localisation of the origin (or exit site) of a ventricular tachycardia can be helpful in understanding the cause of the VT and is very helpful when planning an ablation procedure to treat a ventricular tachycardia.
The localisation of the origin (or exit site) of a ventricular tachycardia can be helpful in understanding the cause of the VT and is very helpful when planning an ablation procedure to treat a ventricular tachycardia.


Using this approach and the algorithm on the right <cite>segal</cite>  the exit site can be estimated with reasonable accuracy (PPV around 70%).
The steps to finding the exit site are:
[[File:LBBB_VT_i.svg|thumb|left|300px|Localising the VT exit in LBBB VT with negative QRS complexes inferior]]
# What is the bundle branch block (BBB) configuration?
[[File:LBBB_VT_p.svg|thumb|none|300px|Localising the VT exit in LBBB VT with positive QRS complexes inferior]]
# What is the inferior lead QRS complex polarity?
[[File:RBBB_VT.svg|thumb|300px|left|Localising the VT exit in RBBB VT with positive QRS complexes inferior]]
# What is the lead I QRS complex polarity?
[[File:RBBB_VT2.svg|thumb|300px|none|Localising the VT exit in RBBB VT with negative QRS complexes inferior]]
# What is the lead aVL QRS complex polarity?
# What is the lead aVR QRS complex polarity?
# Where is the R-wave transition point?
 
Using this approach and the algorithms below <cite>segal</cite>  the exit site can be estimated with reasonable accuracy (PPV around 70%). In these algorhythms, bundle branch block was defined as “left” or “right” based on QRS morphology in lead V1; right bundle branch block (RBBB) pattern was defined by a mono-, bi-, or triphasic R wave or qR in V1; LBBB pattern was defined by a QS, rS, or qrS in V1.
 
[[File:LBBB_VT_i.svg|thumb|left|300px|Localising the VT exit in LBBB VT with negative QRS complexes inferior. Adapted from Segal et al.<cite>segal</cite>]]
[[File:LBBB_VT_p.svg|thumb|none|300px|Localising the VT exit in LBBB VT with positive QRS complexes inferior. Adapted from Segal et al.<cite>segal</cite>]]
[[File:RBBB_VT.svg|thumb|300px|left|Localising the VT exit in RBBB VT with negative QRS complexes inferior. Adapted from Segal et al.<cite>segal</cite>]]
[[File:RBBB_VT2.svg|thumb|300px|none|Localising the VT exit in RBBB VT with positive QRS complexes inferior. Adapted from Segal et al.<cite>segal</cite>]]
==References==
==References==
<biblio>
<biblio>

Latest revision as of 15:44, 8 March 2023

Areas of the left ventricle where VT's can originate from: The left ventricle is depicted as having been opened. Regions are defined as: AA = antero-apical; AB = antero-basal; AM = mid-anterior; SA = apical septum; SB = basal-septum; SM = mid-septum; IA = inferior apex; IB = inferior-basal; IM = mid-inferior. Posterior / lateral is located on the part between anterior and inferior. Adapted from Miller et al.[1]

The localisation of the origin (or exit site) of a ventricular tachycardia can be helpful in understanding the cause of the VT and is very helpful when planning an ablation procedure to treat a ventricular tachycardia.

The steps to finding the exit site are:

  1. What is the bundle branch block (BBB) configuration?
  2. What is the inferior lead QRS complex polarity?
  3. What is the lead I QRS complex polarity?
  4. What is the lead aVL QRS complex polarity?
  5. What is the lead aVR QRS complex polarity?
  6. Where is the R-wave transition point?

Using this approach and the algorithms below [2] the exit site can be estimated with reasonable accuracy (PPV around 70%). In these algorhythms, bundle branch block was defined as “left” or “right” based on QRS morphology in lead V1; right bundle branch block (RBBB) pattern was defined by a mono-, bi-, or triphasic R wave or qR in V1; LBBB pattern was defined by a QS, rS, or qrS in V1.

Localising the VT exit in LBBB VT with negative QRS complexes inferior. Adapted from Segal et al.[2]
Localising the VT exit in LBBB VT with positive QRS complexes inferior. Adapted from Segal et al.[2]
Localising the VT exit in RBBB VT with negative QRS complexes inferior. Adapted from Segal et al.[2]
Localising the VT exit in RBBB VT with positive QRS complexes inferior. Adapted from Segal et al.[2]

References

  1. Miller JM, Marchlinski FE, Buxton AE, and Josephson ME. Relationship between the 12-lead electrocardiogram during ventricular tachycardia and endocardial site of origin in patients with coronary artery disease. Circulation. 1988 Apr;77(4):759-66. DOI:10.1161/01.cir.77.4.759 | PubMed ID:3349580 | HubMed [Miller]
  2. Segal OR, Chow AW, Wong T, Trevisi N, Lowe MD, Davies DW, Della Bella P, Packer DL, and Peters NS. A novel algorithm for determining endocardial VT exit site from 12-lead surface ECG characteristics in human, infarct-related ventricular tachycardia. J Cardiovasc Electrophysiol. 2007 Feb;18(2):161-8. DOI:10.1111/j.1540-8167.2007.00721.x | PubMed ID:17338765 | HubMed [segal]

All Medline abstracts: PubMed | HubMed