A medical phone application has been designed to attend to the health conditions of human beings.
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Post operative monitoring of free flap tissue perfusion is vital.
Devices available are expensive and complex to operate. Most surgeons
rely on direct clinical observation. A monitoring system that is
reliable, inexpensive, and easy to operate is needed.
Using mobile phone technology, the authors developed and evaluated a new free flap monitoring system: SilpaRamanitor.
Methods:
The software was developed for Android-operated mobile phones.
Forty-two normal subjects were recruited to assess its effectiveness.
Varying degrees of pressure were applied around the index finger to
produce partial venous occlusion, partial arterial occlusion, complete
venous occlusion, and complete arterial occlusion sequentially.
Photographs of each subject’s index and middle fingers were taken using the smartphone camera.
To detect the abnormal perfusion presented on the index finger, the
application was instructed to analyse photographs for colour
difference, with the un-occluded middle finger serving as the control.
Results:
The sensitivity, specificity, accuracy, false-negative results and
false-positive results were 94, 98, 95, 6 and one per cent,
respectively. The accuracy of the application in grading occlusion
severity was also evaluated. Thirty-nine cases (93 per cent) were
correctly identified as venous occlusion.
The occlusion severity was correctly identified in 33 cases (85 per
cent). Likewise, for the 40 cases (95 per cent) correctly identified as
arterial occlusion, the method correctly categorised its severity in 33
cases (83 per cent).
Conclusions:
The authors developed a new, accurate and reliable diagnostic
system for postoperative microsurgery monitoring using a smartphone
application. SilpaRamanitor is inexpensive and easy to use, making it
applicable in many microsurgical settings.
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