7. Larva Pupa 1 - 2 Days 1 - 3 Days 6 - 8 Days 2 - 3 Days Water LIFE CYCLE OF THE AEDES Adult Eggs Hatch 1- 48 hrs Complete cycle 9 – 10 days
8. DENGUE TRANSMISSION Infected Person Susceptible Person Mosquito Bite Infected Mosquito Infected Mosquito Bites next person Becomes Sick Mosquito Bite Infected Mosquito 3 – 14 days later Remains viremic 2 to 10 Days 8 – 12 DAYS
9. Manifestations of the dengue syndrome Asymptomatic Undifferentiated fever No h'rage Unusual hemorrhage Dengue Fever DHF I & II DSS Dengue Hemorrhagic Fever ( plasma leakage) Symptomatic Dengue virus Infection
10.
11. Dengue Shock Syndrome (WHO 1997) All the above 4 criteria for DHF, plus evidence of circulatory failure: rapid and weak pulse narrow pulse pressure less than 20mmHg or hypotension for age cold clammy skin and restlessness
12. WHO grading of DHF/DSS (WHO 1997 ) Grade 1 In the presence of haemoconcentration, fever and symptoms, a positive TT Grade 2 spontaneous bleeding in addition to the manifestation from Grade 2 Grade 3* circulatory failure, pulse pressure less than 20 mmHg but systolic pressure normal Grade 4* profound shock, hypotension or unrecordable blood pressure. Simplification: Grade 1 & 2: Non-shock DHF Grade 3: COMPENSATED shock Grade 4: DECOMPENSATED shock #
33. 120 110 100 90 80 70 60 Blood pressure, pulse pressure, heart rate in hypovolemic shock Time LCS Lum Compensated shock Decompensated shock First sign of shock is tachycardia Followed by increasing diastolic BP Drop is systolic BP is relatively late event PR