THC temporarily increases blood pressure and heart rate, so it should be taken cautiously if you have significant cardiovascular risk factors.
However, studies suggest that prolonged administration of THC, in both humans and experimental animals, lowers both blood pressure and heart rate. Animal studies suggest that this may be due to a reduction in adrenergic tone, which is also how beta-blockers, such as metoprolol, work as anti-hypertensives. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2228270/
Additionally, as a smooth muscle dilator, THC relaxes the walls of the arteries, which results in lower blood pressure; this is also how cannabis opens the airways (bronchodiation) and has saved the lives of many asthmatics caught in an attack without their rescue inhaler. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2228270/
Also, a study published last year found that a 600mg dose of CBD reduced blood pressure while resting, as well as when under physical or mental stress. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5470879/#B7
High CBD strains to consider: ACDC - a 20:1 sativa strain Ringo's Gift - a 25:1 hybrid strain Charlotte's Web - a 30:1 sativa strain Harlequin - a 5:2 sativa strain Sweet and Sour Widow - a 1:1 indica strain Pennywise - a 1:1 indica strain Cannatonic - a 3:1 hybrid strain
You should keep a log to see if the addition of the CBD:THC to your regimen has had a positive effect on your blood pressure.
Hope this helps!