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Bloom's Taxonomy classifies educational objectives into three domains:
- Cognitive domain: Knowledge, comprehension, application, analysis, synthesis, evaluation
- Affective domain: Attitudes, values, emotional responses
- Psychomotor domain: Physical and motor skills β e.g., performing injections, wound dressing, CPR
In nursing education, the psychomotor domain is critical for clinical skill development. A Head Nurse supervising nursing students or staff must assess all three domains for comprehensive competency evaluation.
In the figure, the areas of the two shaded regions of the circle are equal.
Compare:
Column A: The area of unshaded region $A$ of the circle
Column B: The area of unshaded region $B$ of the circle
The two chords divide the circle into four regions. Let the two shaded regions have equal area $S$ each, so total shaded area $= 2S$.
Total circle area $= 2S + \text{(unshaded A)} + \text{(unshaded B)}$.
By the symmetry of the two intersecting chords and the equal shaded areas, the two unshaded regions must also be equal to each other. Therefore the area of unshaded region $A$ equals the area of unshaded region $B$, and the two quantities are equal.
This is a classic presentation of Neonatal Respiratory Distress Syndrome (RDS), also called Hyaline Membrane Disease:
- Prematurity (36 weeks β late preterm)
- Grunting, retractions, nasal flaring, tachypnea
- Ground glass appearance + air bronchograms on CXR = pathognomonic of RDS
Pathophysiology: Deficiency of surfactant (produced by Type II pneumocytes from ~24 weeks, mature by ~35 weeks). Surfactant reduces alveolar surface tension. Without it:
\[\text{Surface tension} \uparrow \Rightarrow \text{Alveolar collapse} \Rightarrow \text{V/Q mismatch} \Rightarrow \text{Hypoxia}\]
- Treatment: Exogenous surfactant (beractant, poractant alfa) via endotracheal tube + respiratory support (CPAP/mechanical ventilation)
- Prevention: Antenatal corticosteroids (betamethasone 12 mg IM Γ 2 doses, 24 hrs apart) if delivery expected before 34 weeks β accelerates fetal lung maturity
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