I’m going to take a stab in the dark and say it’s due to the dehydrating effect as well as the diuretic effect- I believe a full bladder can raise your BP up to +20 systolic.
I have labile hypertension and I’m pretty prone to large spikes and have never noticed a change from kava.
if it’s only for a while post-kava you’re likely fine (assuming it’s not a horrifically high number) however try stay extra hydrated before and after drinking it and see if it makes a difference.
I haven't drank kava yet myself but .. Do you drink heavy or heady kavas? Maybe it's something so do with the stimulant effects?- not sure if kavas heady/heavy effects are anything like cannabis or not but there have been times where i could feel my blood pressure was high after smoking, depending on what strain I smoked (altho I think even heavy strains can affect your bp) and the state of my mind and body. But I even find things like chamomile and lemon balm to have quite a strong effect on how my body feels, I've had nauseating effects from all of the above and I find nausea can affects my bp.
The only thing I can think of to help is, other than seeing a doctor is, diaphragmatic breathing (and slowing down your breathing as well) and seeing if there are any factors in your daily life that could be contributing to high BP.
Unfortunately, I've been noticing my blood pressure spiking quite high after drinking kava as well. I'm usually at around 120/70, but last night (about 1.5 hours after beginning a session), measured 143/84 (that was before eating too). It's got me a little concerned...
That's really interesting, I'd love to see how it goes over time.
I've actually noticed too I have a slight increase in heart rate although BP cotinues to have no obvious change.
Just editing- I took a beta blocker last night (I have ongoing congenital cardiac symptoms that I get regular tests for) and kava today hasn’t affected my heart rate, so perhaps it affects adrenaline/noradrenaline or maybe for me at least the effect isn’t so strong as to override other factors that can lower heart rate.
Edit: Important to keep in mind these studies elucidated these effects at the lowest dosage concentration of 10µM, which is much much higher than concentrations found after kava consumption in brain regions of rats, by a factor of about ten.