Your doctor probably told you to drink more water because a) that is a common problem with many people, and b) it is the most common exercise-induced cause of low blood pressure. However, there are other causes and specific tests that can be run, including :
” * CBC (complete blood count). CBC may reveal anemia from blood loss or elevated white blood cells due to infection.
* Blood electrolyte measurements may show dehydration and mineral depletion, renal failure (kidney failure), or acidosis (excess acid in the blood).
* Cortisol levels can be measured to diagnose adrenal insufficiency and Addison’s disease.
* Blood and urine cultures can be performed to diagnose septicemia and bladder infections, respectively.
* Radiology studies, such as chest x-rays, abdominal ultrasounds, and computerized tomography (CT or CAT) scans may detect pneumonia, heart failure, gallstones, pancreatitis, and diverticulitis.
* Electrocardiograms (EKG) can detect abnormally slow or rapid heart beats, pericarditis, and heart muscle damage from either previous heart attacks or a reduced supply of blood to the heart muscle that has not yet caused a heart attack.
* Holter monitor recordings are used to diagnose intermittent episodes of abnormal heart rhythms. If abnormal rhythms occur intermittently, a standard EKG performed at the time of a visit to the doctor’s office may not show the abnormal rhythm. A Holter monitor is a continuous recording of the heart’s rhythm for 24 hours that often is used to diagnose intermittent episodes of bradycardia or tachycardia.
* Patient-activated event recorder. If the episodes of bradycardia or tachycardia are infrequent, a 24-hour Holter recording may not capture these sporadic episodes. In this situation, a patient can wear a patient-activated event recorder for up to four weeks. The patient presses a button to start the recording when he or she senses the onset of an abnormal heart rhythm or symptoms possibly caused by low blood pressure. The doctor then analyzes the recordings at a later date to identify the abnormal episodes.
* Echocardiograms are examinations of the structures and motion of the heart using ultrasound. Echocardiograms can detect pericardial fluid due to pericarditis, the extent of heart muscle damage from heart attacks, diseases of the heart valves, and rare tumors of the heart.
* Ultrasound examinations of the leg veins and CT scans of the chest can detect deep vein thrombosis and pulmonary embolism.
* Tilt-Table tests are used to evaluate patients suspected of having postural hypotension or syncope due to abnormal autonomic nerves. During a tilt-table test, the patient lies on an examining table with an intravenous infusion administered while the heart rate and blood pressure are monitored. The table then is tilted upright for 15 minutes to 45 minutes. Heart rate and blood pressure are monitored every few minutes. The purpose of the test is to try to reproduce postural hypotension. Sometimes a doctor may administer epinephrine (Adrenalin, Isuprel) intravenously to induce postural hypotension.”
In your case, does your doctor know your mother has been diagnosed with LBP? What is the cause of your mother’s LBP? Have you tried documenting how much water you are drinking and sharing that with your doctor? These factors could change how your doctor approaches treating you.
As an example, I had a problem several years ago where my kidney numbers were off. The doctor kept telling me to drink more water. I did and told him so, but he still did nothing. However, when I kept a record of how much and when I was drinking water and showed it to him, he decided something else was going on. He sent me to a nephrologist who confirmed that my problem was not from dehydration but from a kidney problem. I looked at possible causes myself and tried one that was easy and wouldn’t hurt anything – I stopped taking the NSAIDs prescribed for arthritis pain (Naproxen and later Mobic) because they can irritate your kidneys. In my case this turned out to be the cause, and the nephrologist was quite shocked, saying that usually people with the creatinine level I was showing do not recover. So now my kidneys are fine but my joints hurt.