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Question 7 and 8
Here is a clear summary of both comparison tables from the image:
Q7. Antemortem vs Postmortem Drowning
| Feature | Antemortem Drowning | Postmortem Drowning |
|---|---|---|
| Froth at mouth/nostrils | Fine, white, tenacious, copious - reappears on pressing chest (pathognomonic) | Absent |
| Cadaveric spasm | Present - grass/mud gripped in hand | Absent |
| Lungs | Voluminous, ballooned, show rib impressions (emphysema aquosum) | No such changes |
| Water in trachea/bronchus | Present | Absent (or minimal) |
| Water in stomach/small intestine | Present | Absent |
| Paltauf's hemorrhages | Present (subpleural hemorrhages) | Absent |
| Diatom test | Diatoms found in distant organs (bone marrow, spleen, kidney) | Diatoms NOT found in distant organs |
| Gettler's test | Chloride difference between right and left heart | No difference |
| PM staining | Present over face, neck, front of chest | Non-specific distribution |
| Cutis anserina | Due to contraction of erector pili in cold water | Due to rigor mortis of erector pili |
Q8. Hanging vs Strangulation
| Feature | Hanging | Strangulation |
|---|---|---|
| Signs of asphyxia | Less marked | More marked |
| Protrusion of tongue | Less | More |
| Bleeding from nose, ear | Rare | More common |
| Ligature mark - Direction | Oblique | Horizontal |
| Ligature mark - Continuity | Incomplete | Complete |
| Ligature mark - Level in neck | Above thyroid cartilage | Below thyroid cartilage |
| Ligature mark - Base | Hard, dry, parchment-like | Soft, reddish base |
| Abrasions/bruise around ligature | Less common | More common |
| Tissues beneath ligature mark | White, glistening | Shows hemorrhage and ecchymosis |
| Fracture of thyroid cartilage | Less common | More common |
| Fracture of hyoid bone | More common | Less common |
| Stains of saliva | Common | Rare |
| Discharge of urine and feces | Less common | More common |
| Seminal discharge | Common | Rare |
| Manner of death | Suicidal | Homicidal |
Key exam points to remember:
- The diatom test is the most reliable test to confirm antemortem drowning - diatoms crossing into distant organs (BM, spleen, kidney) via the bloodstream proves the person was alive while drowning.
- In hanging, the hyoid bone fractures more often (due to the upward pull of the ligature), while the thyroid cartilage fractures more in strangulation (direct compression).
- The ligature mark in hanging is oblique and incomplete (does not go all the way around), whereas in strangulation it is horizontal and complete.
- Saliva stains and seminal discharge are common in hanging (vagal stimulation), rare in strangulation.
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