>I have been diagnosed with paroxysmal supraventricular tachycardia. I have had 3 incidents since march 2012 that resolved without intervention. My cardiologist has reviewed prior echostress and done ultrasound or nonstress echo and cleared to dive. I have made 3 dive trips without incident.I am very pleased with my doctor but they are not a dive specialist. What is DAN's recommendation with respect to diving with PSVT.
- The likelihood of you having a syncopal episode while diving; and
- The likelihood of a sudden SVT causing myocardial ischemia while diving.
>So, if your doctors agree that the likelihood of a sudden LOC is negligible, then initially this should not necessarily be an absolute contraindication.
>MYOCARDIAL ISCHEMIA: Though the risks of a sudden death with a paroxysmal SVT are typically small, it is prudent to accept the fact that abnormal heart rhythms can have a life threatening impact in coronary artery perfusion. PSVT can result in myocardial ischemia, myocardial infarction, pulmonary edema, and heart failure in patients with poor left ventricular function. A heart stress test is the best way to assess someone's cardiovascular fitness. This functional test is also considered the best way to assess someone's cardiovascular fitness to dive, with its limitations, of course, for it does not account for the hemodynamic changes that take place during immersion, nor does it account for cold, peripheral vasoconstriction and increased breathing gas density; all of which may have a variable degree of relevance depending on the diving environment that it is to be pursued. Acceptable values for a heart stress test are probably a sustained workload of about 7-8 METs, tolerating peaks of up to 10 METs (this will make sense to your doctors).
>Author: Dr. Matias Nochetto MD