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Figure 3: Electrodiagnostic studies in a 28-year-old man with monocrotophos poisoning. Twenty-six hours after poisoning and 16 hours after institution of mechanical ventilation, single supramaximal electrical stimulus induced repetitive response was observed and 30 Hz RNS produced a severe decrement (a) in the abductor pollicis brevis, which partially corrected following the administration of pralidoxime iodide (2 g intravenous). At 50 hours (b) and 72 hours (c) after poisoning, the decremental response to 30 Hz RNS was still noted and this corrected after the administration of pralidoxime. However, 98 hours after poisoning (d), although the decremental response to 30 Hz RNS was still present it did not correct after administration of pralidoxime

Figure 3: Electrodiagnostic studies in a 28-year-old man with monocrotophos poisoning. Twenty-six hours after poisoning and 16 hours after institution of mechanical ventilation, single supramaximal electrical stimulus induced repetitive response was observed and 30 Hz RNS produced a severe decrement (a) in the abductor pollicis brevis, which partially corrected following the administration of pralidoxime iodide (2 g intravenous). At 50 hours (b) and 72 hours (c) after poisoning, the decremental response to 30 Hz RNS was still noted and this corrected after the administration of pralidoxime. However, 98 hours after poisoning (d), although the decremental response to 30 Hz RNS was still present it did not correct after administration of pralidoxime