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Heart Disease (Expert Forum)
ECG
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ECG
by long, Jun 22, 2003 12:00AM
I am 47 year old male who had resting ECG with the folowing result: "Vent.rate 68; PR interval 168 ms; QRS duration 88 ms; QT/QTc 360/383 ms; P-R-T AXES 66 -5 25; Normal sinus rhythm;Minimal votage criteria for LVH,may be noral variant;Borderline ECG." What does this mean?At what size (in cm) is (IVC) inferior vena cava considered pathalogy in an 47 year old long distance runner and in an sedentary person of the same age?I am also planning of having heart PET scan test done,but don't know how is this test done,especially stress part of the heart PET scan.If heart is (adenosine) drug induced to beat fast during heart PET scan test, to what %MHR is this usually done and for how long?Do drugs cause arrhythmias and what happens if heart rate does not return to normal?Do they do heart PET scan test without heart rate inducing drugs,but instead using exercize treadmil?Thanks
Doctor's Answer
by CCF-M.D.-RCJ, Jun 22, 2003 12:00AM
Long,
Wow! A lot of questions. Here goes ...
(1)"What does this mean?"
A: This ECG is more or less normal. ECGs have to be interpreted in the context under which they are obtained ... like most things in life. If you have a history of high blood pressure, then the LVH may indicate that your heart has enlarged due to the high pressures, otherwise the ECG sounds normal.
(2)"At what size (in cm) is (IVC) inferior vena cava considered pathalogy"?
A: Usually > 2 cm is considered large.
(3)"If heart is (adenosine) drug induced to beat fast during heart PET scan test, to what %MHR is this usually done and for how long?"
A: The adenosine infusion is not titrated to reach a certain heart rate. The theory behind adenosine "stress" is different than with exercise, and is based on a principal called the coronary steal phenomenon. The duration of infusion is typically several minutes, and depends upon the center at which the test is performed.
(4)"Do drugs cause arrhythmias and what happens if heart rate does not return to normal?"
A: Adenosine infusion can rarely precipitate abnormal heart rthyms. I have never seen a patient's heart rate not return to normal. The half-life of adenosine is seconds, therefore I cannot fathom a mechanism by which a person would develop incessant sinus tachycardia.
(5)"Do they do heart PET scan test without heart rate inducing drugs,but instead using exercize treadmil?"
A: Some centers do. We do not at the Cleveland Clinic.
Hope that helps.
Wow! A lot of questions. Here goes ...
(1)"What does this mean?"
A: This ECG is more or less normal. ECGs have to be interpreted in the context under which they are obtained ... like most things in life. If you have a history of high blood pressure, then the LVH may indicate that your heart has enlarged due to the high pressures, otherwise the ECG sounds normal.
(2)"At what size (in cm) is (IVC) inferior vena cava considered pathalogy"?
A: Usually > 2 cm is considered large.
(3)"If heart is (adenosine) drug induced to beat fast during heart PET scan test, to what %MHR is this usually done and for how long?"
A: The adenosine infusion is not titrated to reach a certain heart rate. The theory behind adenosine "stress" is different than with exercise, and is based on a principal called the coronary steal phenomenon. The duration of infusion is typically several minutes, and depends upon the center at which the test is performed.
(4)"Do drugs cause arrhythmias and what happens if heart rate does not return to normal?"
A: Adenosine infusion can rarely precipitate abnormal heart rthyms. I have never seen a patient's heart rate not return to normal. The half-life of adenosine is seconds, therefore I cannot fathom a mechanism by which a person would develop incessant sinus tachycardia.
(5)"Do they do heart PET scan test without heart rate inducing drugs,but instead using exercize treadmil?"
A: Some centers do. We do not at the Cleveland Clinic.
Hope that helps.
