Brief Answer:
Since tests normal, nothing to worry about.

Detailed Answer:
Hello and welcome to Health Care Magic. Thank you for your question. I understand your concern.

Well, let us take things step by step. First, and most importantly, you have done the basic and important tests to evaluate your heart and everything came back normal. If the episode that happened to you while driving makes you think you have a problem with your coronary arteries, then I should explain that angina (pain originated from blockage(s) within the coronary arteries) is originated in the mid-chest area and the vast majority of patients describe it more like a heaviness or squeezing sensation, rather than pain. It then may radiate to both sides of the chest, to the left shoulder, left arm and the jaw. It is triggered by physical activity in most cases. Therefore, I do not think this was angina, in your case. Also, it is unusual for a 52-year old lady to have cardiovascular problems, however not impossible. As about the drop of blood pressure on the cardiac stress test, an indicative to a possible coronary disease is the initial failure of the blood pressure to rise or when it, instead of increasing, it goes to lower figures. If the electrical system of the heart was not disturbed during your cardiac stress test, and it was interpreted as normal, then we can exclude, with highest probability, a cardiac origin of the problem.

Normal heart rate is 60-100 beats per minute. This is for a resting individual. Every time we exercise, or are undergoing psychological stress, or after caffeine-containing beverages, it can spike significantly and still considered normal. Actually, there is a formula for this and it is: 220-age. This means that, in your case, for the above mentioned factor, a heart rate up to 168 beats per minute is considered as normal. Keep in mind that it also can go up if an outpatient or a hospitalized patient is undergoing a clinical or diagnostic procedure, due to increased stress about a lot of questions one asks oneself about the outcomes of the test.

Oxygen saturations are accepted as normal when above 90%, in resting state. Your description does not fit the asthma diagnosis. However, it is true that genetic factor is closely related the bronchial asthma some time in the descendants' life of an asthmatic individual. If you are really worried that you might have asthma, then I would recommend you a spirometry. This is the most commonly used pulmonary function tests, which measures the capacity of the lungs both in inspiration and expiration. The results of this test can rule out asthma, or confirm/exclude any bronchial constricting disorder.

I hope I was helpful with my answer. I am happy to help, if you have follow-up questions. Wish you good health.

Best regards,
Dr. Meriton

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