New research shows a woman who holds her breath during radiation pulses can greatly reduce radiation exposure to the heart.

“Radiation therapy is commonly prescribed to patients with breast cancer following surgery as a component of first-line therapy,” said first author Harriet Eldredge-Hindy, a Chief Resident and researcher in the Department of Radiation Oncology at Thomas Jefferson University “We wanted to determine how effective breath-hold could be in shielding the heart from extraneous radiation exposure during treatment of the left breast.”

Recent studies have shown women with cancer in the left breast are at higher risk of heart disease, and that the risk increases proportionately with the dose of radiation the heart is exposed to during treatment. A number of techniques have been developed to reduce exposure to the heart including prone positioning (lying flat on the belly on a bed that only exposes the left breast), intensity-modulated radiation therapy (IMRT), and accelerated partial breast irradiation. The breath-hold technique allows doctors to monitor a patient’s breath for the position that shifts the heart out of the range of the radiation beam.

In the largest prospective study to date, following women for 8 years post treatment, 81 women were asked to hold their breath during radiation treatment for breast cancer– a process that was repeated until therapeutic dose was reached. The researchers found that patients capable of holding their breath over the course of treatment had a 90 percent disease-free survival, and a 96 percent overall survival, with a median reduction in radiation dose to the heart of 62 percent. The findings were published online this week in the journal Practical Radiation Oncology.

“Given that this technique helps to shield the heart during radiation treatment for breast cancer,” said Rani Anne, Associate Professor of Radiation Oncology at Thomas Jefferson University and senior author on the study, “we routinely offer breast cancer treatment with the breath hold technique at Jefferson.”