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First, they packed the piezoelectric transducers closer together, enabling them to provide wider coverage so they could better target smaller arteries such as the brachial and radial arteries, which are more clinically relevant.

He recalled that Christian, a keen boxer, measured a pulse rate of 240bpm, but said there was "little pulsation" in his radial artery and "essentially no circulation" in his fingers.

This year, he missed more than after sustaining lacerations to his radial artery and two superficial radial nerves in his right wrist caused by an opponent’s skate.

In the Kings’ Nov. 25 win over the San Jose Sharks, Martinez sustained lacerations to his radial artery and two superficial radial nerves in his right wrist.

But in a first, Syed and his team chose to thread the catheter through the radial artery of each patient's wrist.