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Monday, April 16, 2012

How to Prevent Heart Attacks if You are Using Testosterone

Testosterone and anabolics can increase red blood cells.  The proportion of red blood cells in the blood is called hematocrit.  High hematocrit (polycythemia) can make blood viscous and increase the work load on the heart, which can cause serious cardiovascular problems and even heart attacks and strokes.  So, it is important to monitor hematocrit and know how to manage it if it is high.

Preventing and Managing Polycythemia

It's important to check patients' hemoglobin and hematocrit blood levels while on testosterone replacement therapy. As we all know, hemoglobin is the substance that makes blood red and helps transport oxygen in the blood. Hematocrit reflects the proportion of red cells to total blood volume. A hematocrit of over 52 percent or a hemoglobin value over 19 g/dl should be evaluated. Decreasing testosterone dose or stopping it are options that may not be the best for assuring patients' best quality of life, however. Switching from injectable to transdermal testosterone may decrease hematocrit, but in many cases not to the degree needed.

The following table shows the different guideline groups that recommend monitoring for testosterone replacement therapy.  Since hematocrit increases usually happen during the first few months of testosterone replacement, all guideline groups agree on measuring hematocrit at month 3, and then annually, with some also recommending measurements at month 6 after starting testosterone.

Monitoring testosterone therapy: What the consensus guidelines say

Many patients on testosterone replacement who experience polycythemia do not want to stop the therapy due to fears of re-experiencing the depression, fatigue and low sex-drive they had before starting treatment. For those patients, therapeutic phlebotomy may be the answer. Therapeutic phlebotomy is very similar to what happens when donating blood, but this procedure is prescribed by physicians as a way to bring down blood hematocrit and viscosity.

A phlebotomy of one pint of blood will generally lower hematocrit by about 3 percent. I have seen phlebotomy given weekly for several weeks bring hematocrit from 56 percent to a healthy 46 percent. I know physicians who prescribe phlebotomy once every 8-12 weeks because of an unusual response to testosterone replacement therapy. This simple procedure is done in a hospital blood draw or a blood bank facility and can reduce hematocrit, hemoglobin, and blood iron easily and in less than one hour. Unfortunately, therapeutic phlebotomy can be a difficult option to get reimbursed or covered by insurance companies. The reimbursement codes for therapeutic phlebotomy are CPT 39107, icd9 code 289.0.

Unless a local blood bank is willing to help, some physicians may need to write a letter of medical necessity for phlebotomy if requested by insurance companies. If the patient is healthy and without HIV, hepatitis B, C, or other infections, they could donate blood at a blood bank (it is good to remember that there is a ban on gay blood donors in the United States, however).

The approximate amount of blood volume that needs to be withdrawn to restore normal values can be calculated by the following formula, courtesy of Dr. Michael Scally, an expert on testosterone side effect management. The use of the formula includes the assumption that whole blood is withdrawn. The duration over which the blood volume is withdrawn is affected by whether concurrent fluid replacement occurs.

Volume of Withdrawn Blood (cc)=
Weight (kg) × ABV×[Hgbi - Hgbf]/[(Hgbi +Hgbf)/2]

ABV = Average Blood Volume (default = 70)
Hgbi (Hcti) = Hemoglobin initial
Hgbf (Hctf) = Hemoglobin final (desired);

So, for a 70 kg (154 lbs) man (multiply lbs x 0.45359237 to get kilogram) with an initial high hemoglobin of 20 mg/mL who needs to have it brought down to a normal hemoglobin of 14 mg/mL, the calculation would be:

CC of blood volume to be withdrawn = 75 x 70 x [20 - l4]/[(20 + l4)/2] = 75 x 70 x (6/17) = approximately 1850 cc;

One unit of whole blood is around 350 to 450 cc; approximately 4 units of blood need to be withdrawn to decrease this man's hemoglobin from 20 mg/mL to 14 mg/mL.

The frequency of the phlebotomy depends on individual factors, but most men can do one every two to three months to manage their hemoglobin this way. Sometimes red blood cell production normalizes without any specific reason. It is impossible to predict exactly who is more prone to developing polycythemia, but men who use higher doses, men with higher fat percentage, and older men may have a higher incidence.

Some doctors recommend the use of a baby aspirin (81 mg) a day and 2,000 to 4,000 mg a day of omega-3 fatty acids (fish oil capsules) to help lower blood viscosity and prevent heart attacks. These can be an important part of most people's health regimen but they are not alternatives for therapeutic phlebotomy if the patient has polycythemia and does not want to stop testosterone therapy. It is concerning that many people assume that they are completely free of stroke/heart attack risks by taking aspirin and omega-3 supplements when they have a high hematocrit.

Although some people may have more headaches induced by high blood pressure or get extremely red when they exercise, most do not feel any different when they have polycythemia. This does not make it any less dangerous. It may be a silent killer that is easy to prevent.

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