Dextrocardia or Reversed Limb Leads?
Dextrocardia or Reversed Limb Leads?
Which one of the following does this tracing show?
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Answer: Dextrocardia as a part of situs inversus
Discussion
The QRS is mostly negative in lead I, making us think of right axis deviation. However, the P wave is also negative, which occurs only in 2 ways: reversed arm leads or dextrocardia. The precordial leads will tell us which one it is. If the R waves progress normally, it is reversed arm leads. If the R waves regress as in this case, it is dextrocardia, which is what this patient has.
Which one of the following does this tracing show?
Dextrocardia as a part of situs inversus
Reversed arm leads
View the correct answer
Answer: Dextrocardia as a part of situs inversus
Discussion
The QRS is mostly negative in lead I, making us think of right axis deviation. However, the P wave is also negative, which occurs only in 2 ways: reversed arm leads or dextrocardia. The precordial leads will tell us which one it is. If the R waves progress normally, it is reversed arm leads. If the R waves regress as in this case, it is dextrocardia, which is what this patient has.
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