Palpae Potami: The new proposed method for locating the dorsalis pedis artery

The research is published in the Indian Journal of Surgery.

The peripheral pulse examination of the foot is the preliminary yet important step in diagnosing peripheral vascular diseases. It has been reported that locating the dorsalis pedis pulse is difficult with existing variability among examiners when compared with another distal foot pulse examination. Ill-defined landmarks and a high rate of aberrant course of the artery have been attributed for its difficulty hence its palpation becomes a challenging task.

Therefore, Aravind Ravichandran and Aparnaa Balasubramanian from the Government Theni Medical College, Madurai, India formulated a new method for examination of dorsalis pedis pulse.

The authors studied a total of 102 patients who were admitted in a tertiary care center where their dorsalis pedis pulse was examined by portable Doppler and clinical methods. Two examiners, double-blinded examined the dorsalis pedis artery using the conventional method and the new method independently, and documented their findings.

The key findings highlighted from the study were-

a. Dorsalis pedis pulse was impalpable in 2.9% of cases by both methods.

b. The palpae potami method located the dorsalis pedis pulse in 90% of cases, while the conventional method located dorsalis pedis pulse in 83.3% of cases.

c. The palpae potami method has better sensitivity and specificity of 96.8% and 75%, respectively, while the conventional method had sensitivity and specificity of 86% and 50%, respectively.

d. The mean duration taken by a conventional method to locate the pulse was 4.7 s, while palpae potami took 31 s.

e. The absence of dorsalis pulse was seen in 7.2% of the cases.

f. The presence of systemic hypertension in patients lower the dorsalis pedis pulse detection in the conventional method (p = 0.0023), while no significant difference in pulse detection was found by the palpae potami method.

Therefore, the authors concluded that "the new method devised method increased the chance of locating the dorsalis pedis artery significantly than by conventional method which could be translated to higher case pickup of peripheral vascular diseases in a resource-limited setting."

The difficulties encountered by the conventional method in locating dorsalis pedis pulse could be reduced by this method, they further added.