Hello Jayne, the top number is greater than 130 mm Hg, the bottom number is below 80 mm Hg, it's called isolated systolic hypertension, the top number 198 is very high, the bottom number is normal. Isolated systolic hypertension is the most common form of high blood pressure in people older than age 65. It can lead to serious health problem as stroke, heart disease and chronic kidney disease. Cosnidering the value of your top number, I'll recommend that you get treatment with medicine at your earliest convenience.
