Question:medium
A patient admitted with acute organophosphorous insecticide poisoning develops ptosis, inability to lift the head and difficulty in breathing on the third day. The most likely diagnosis is
A patient admitted with acute organophosphorous insecticide poisoning develops ptosis, inability to lift the head and difficulty in breathing on the third day. The most likely diagnosis is
Show Hint
Weakness of the neck, eyelids, and breathing muscles 1 to 4 days after organophosphorus poisoning has a specific name.
Updated On: Jul 7, 2026
- hypokalemia
- inflammatory polyneuropathy
- intermediate syndrome
- polymyositis
Show Solution
The Correct Option is C
Solution and Explanation
Step 1: Note the timing.
The weakness here, drooping eyelids, a neck too weak to lift the head, and breathing difficulty, starts on day three, not on day one. Timing is the biggest clue in organophosphorus poisoning questions.
Step 2: Recall the three stages of OP poisoning.
Stage one is the acute cholinergic crisis in the first hours, with drooling, small pupils, cramps and a slow pulse. Stage two is the intermediate syndrome, showing up roughly one to four days later. Stage three, delayed polyneuropathy, only shows up after two to three weeks.
Step 3: Match the muscles affected.
Intermediate syndrome hits the muscles close to the trunk, the neck flexors, and the muscles used for breathing and eye opening. That is exactly ptosis, a floppy neck, and breathing trouble, all at once, and all fitting the day three timing.
Step 4: Cross off the distractors.
Low potassium can weaken muscles but is not the textbook cause here and does not explain ptosis. A Guillain-Barre type polyneuropathy usually follows an infection over a longer timeline, not a pesticide exposure. Polymyositis is a slow autoimmune disease, not something that appears three days after poisoning.
Step 5: Conclude.
The day three combination of ptosis, weak neck flexion and breathing difficulty after organophosphorus poisoning is the intermediate syndrome.
\[ \boxed{\text{Intermediate syndrome}} \]
The weakness here, drooping eyelids, a neck too weak to lift the head, and breathing difficulty, starts on day three, not on day one. Timing is the biggest clue in organophosphorus poisoning questions.
Step 2: Recall the three stages of OP poisoning.
Stage one is the acute cholinergic crisis in the first hours, with drooling, small pupils, cramps and a slow pulse. Stage two is the intermediate syndrome, showing up roughly one to four days later. Stage three, delayed polyneuropathy, only shows up after two to three weeks.
Step 3: Match the muscles affected.
Intermediate syndrome hits the muscles close to the trunk, the neck flexors, and the muscles used for breathing and eye opening. That is exactly ptosis, a floppy neck, and breathing trouble, all at once, and all fitting the day three timing.
Step 4: Cross off the distractors.
Low potassium can weaken muscles but is not the textbook cause here and does not explain ptosis. A Guillain-Barre type polyneuropathy usually follows an infection over a longer timeline, not a pesticide exposure. Polymyositis is a slow autoimmune disease, not something that appears three days after poisoning.
Step 5: Conclude.
The day three combination of ptosis, weak neck flexion and breathing difficulty after organophosphorus poisoning is the intermediate syndrome.
\[ \boxed{\text{Intermediate syndrome}} \]
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