Hi Neptune,
There are many planetary and astrological indicators of Cardiac issues. There are also, as you may know, different types of heart illness as well. Arrhythmias are the leading killer. These occur when the heartbeat rhythm is knocked out of whack. It concerns I would think Uranus which rules the body's electrical system if the Heart is malfunctioning due to these arrhythmias. Saturn rules blood clots so if a blood clot is causing the arrhythmia it would involve Saturn as well. Valve problems are indicated by the Sign Aquarius (Uranus) but I do not know why they state Cancer rulership as well. I see by one of my sources that Heart attacks concern having a Leo Sun, Mars in Leo, Mars and Uranus in afflicting transits and/or one's natal chart.
A Leo/Aquarius axis emphasis, (like me), an afflicted Sun, having the Sun, Mars, and Uranus in a affliction to the Moon, or Mars and Uranus afflicting the Sun, Having afflictions originating from the 5th house, (being Leo's home ruler I assume),or malefic planets placed there or the polar opposite 11th house, having a chart with an emphasis on the Fixed Signs, and Saturn in Leo are all indicators of Heart disease.
Heart Murmur is ruled by Venus/ Uranus aspects. As I had suspected uranus concerns palpitations of the heart. but Taurus and Scorpio emphasis (the other fixed signs) are also indicated. Mars in Leo once more. Sun/ Uranus aspects. Uranus in Leo and also the other Fixed signs, Sun/Jupiter and Sun/Mars aspects I would assume in their transits as well. Although its not here if you put Venus rulership to Murmurs and Cancer a ruler of heartvalves you'd think a poorly aspected Venus in Cancer to an afflicted Uranus would indicate Murmurs that is just me. Murmurs are heart valve malfunctions I am quite sure of.
Cardiovascular Disorders are indicated when there are mechanical disorders of the heart. These concern stressful Sun to Neptune and Saturn as well. Afflictions in Leo, and other aspects indentical to Heart disease but to add Jupiter in Capricorn, Mars in Aquarius, and afflictions between Saturn and Jupiter.
Poor metabolism of incoming minerals or lacking thereof in the diet indicate an increase occurence of Heart disease. Selenium, Copper, and Magnesium are vital for heart health. If one buys those Men's Heart health products you will see that these three have been well enriched with those minerals. I would say that its not just men that need those LOL. Selenium concerns the hearts Muscle and Valve health, Copper increases the tensile strength of the artery and blood vessel walls (also prevents aneurisms) I have also read that copper prevents premature graying of the hair as well and to have gray hair early indicates some aneurisms though small are already occurring. I have had some graying since teenage years so I need to watch out I guess LOL. How varifiable that is I do not know. Magnesium keeps the heart (and/or electrical system) beating properly. It and potassium.
There is some of it for you.
Take Care
Franklin