Murphy sign
When doctors investigate sudden, severe abdominal pain, they rely on clues and physical exams developed by surgical pioneers. One of the most enduring diagnostic maneuvers is associated with the acclaimed American surgeon John B. Murphy (1857-1916), who was known for his leadership in abdominal surgery and his valuable contributions to diagnosis. Murphy developed several techniques for evaluating the "acute abdomen", but he is perhaps best remembered for a key diagnostic test involving deep-grip palpation, often used when doctors suspect biliary disease . But what exactly constitutes a positive Murphy sign?
The Classic Diagnosis: An Abrupt Stop by Acute Cholecystitis
In its classic form, Murphy considered a positive sign to be the most characteristic and constant indicator of gallbladder hypersensitiveness . The test determines positivity based on a dramatic reaction by the patient during the examination:
The Critical Action: The physician hooks their fingers up beneath the right costal arch (the lower margin of the ribs).
The Tell-Tale Response: The patient is asked to take a deep breath. A positive result is the inability of the patient to take a full, deep inspiration. The inspiration suddenly ceases, as if it had been "shut off" .
The Mechanism of Pain:This abrupt cessation happens because, as the patient breathes in, the diaphragm acts as the "great piston of respiration," forcing the liver and, consequently, the sensitive, distended, inflamed, or congested gallbladder down onto the examiner's firmly fixed hand. This impact causes severe pain, which results in the patient often giving an accompanying groan and the immediate stopping of the inspiratory act.
Murphy was highly confident in this method, stating that he had never found this particular sign absent in cases involving calculous or infectious disease of the gallbladder or duct.
Modern Updates: Bringing Technology to the Bedside
While the classic deep-grip palpation test remains relevant, the terminology has evolved. Today, general reference to a "positive Murphy sign" often simply means a suggestive responsiveness to deep subcostal palpation.
However, the sign has also embraced modern technology through the "sonographic Murphy sign". This contemporary indicator of acute cholecystitis involves using an ultrasound transducer :
The clinician identifies the position of the gallbladder through scanning.
A positive sonographic sign is confirmed when the application of the ultrasound transducer directly over the gallbladder elicit focal gallbladder tenderness.
This sonographic finding is considered a useful indicator and has been shown to be 87% accurate in diagnosing acute cholecystitis.
Summary
Whether elicited through the traditional method of deep-grip palpation that causes the patient’s breath to be "shut off" mid-inspiration, or confirmed using the modern method of assessing focal tenderness with an ultrasound transducer, the positive Murphy sign remains a vital diagnostic tool. It is a powerful example of how techniques—whether using just your brain and your fingers or advanced imaging—continue to help clinicians differentiate and diagnose conditions like acute gallbladder disease at the bedside.
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