Final answer:
The toe brachial index is used to assess blood flow to the feet and diagnose peripheral arterial disease. It is calculated by measuring the systolic blood pressure of the big toe and dividing it by the systolic blood pressure of the brachial artery. A toe brachial index below 0.7 indicates the presence of peripheral arterial disease.
Step-by-step explanation:
The toe brachial index is a noninvasive method used to assess the blood flow to the feet. It is primarily used as an indication of peripheral arterial disease (PAD), a condition where there is poor blood circulation in the lower limbs. The toe brachial index is used when there is a suspicion of PAD, particularly in patients with symptoms such as pain in the legs, non-healing wounds, or changes in skin color or temperature.
To calculate the toe brachial index, the systolic blood pressure of the big toe is measured using a Doppler ultrasound device. This measurement is then divided by the systolic blood pressure of the brachial artery in the arm to obtain the toe brachial index. A toe brachial index less than 0.7 is considered abnormal and suggests the presence of PAD.
The toe brachial index is a valuable tool for diagnosing and monitoring peripheral arterial disease. It helps healthcare professionals assess the severity of the condition, determine appropriate treatment strategies, and evaluate the effectiveness of interventions aimed at improving blood circulation in the lower limbs.