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We examined 28 women during an early gestation. We found that the Valsalva maneuver, Propanorm, and the combination of both produced an antiarrhythmic effect via the anterograde and retrograde conduction in reentry. The study is the first to reveal that the Valsalva maneuver influences retrograde conduction in reentry in pregnant patients. We proved that it is necessary to use the Valsalva maneuver to stop paroxysms of orthodromic atrioventricular tachycardia (AVRT) in the first trimester of pregnancy. If the maneuver is ineffective, it is advisable to use Propanorm or the combination of Propanorm with Valsalva manoeuvre.
