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AS9.1-4 | Fluids, Blood Products and Vascular Access — Assignment

Instructions

1. Read the patient scenario carefully (provided below in the Scaffolding section).
2. Determine and document the appropriate intravenous access strategy: specify the number of cannulae, gauge sizes, and sites for peripheral access; state whether central venous access is required and justify the choice of site with its anatomical rationale.
3. Calculate the patient's preoperative fluid deficit using the 4-2-1 formula and the stated fasting duration. Show your working.
4. Select the intraoperative maintenance fluid type (justify crystalloid vs colloid choice with physiological rationale) and calculate the estimated maintenance volume for the surgical duration.
5. Estimate anticipated surgical blood loss; state the maximum allowable blood loss (MABL) using the formula: MABL = EBV × (starting Hct − target Hct) / starting Hct, where EBV ≈ 70 mL/kg.
6. State the haemoglobin/haematocrit threshold at which you would initiate a PRBC transfusion for this patient, with justification referencing evidence-based transfusion guidelines.
7. Identify which additional blood products (FFP, platelets, cryoprecipitate) you would have on standby and state the specific thresholds that would trigger their use.
8. Document TWO specific risks of fluid/transfusion management relevant to this patient and state how you would monitor for and manage each.
9. Write a brief summary paragraph (150–200 words) addressed to the surgical team explaining your fluid strategy and the rationale.
10. Submit as a structured clinical document with headings matching the steps above.

Length: 700–950 words (excluding calculations and tables)

Grading Rubric — Fluids, Blood Products and Vascular Access Assignment Rubric

Criterion	Points	Full-marks descriptor
IV access strategy: appropriate gauge, site selection, and justification for peripheral and/or central access based on surgical and patient requirements	20 pts	Correct gauge (≥16G), appropriate sites identified, central access need correctly assessed with anatomical/clinical justification; rationale demonstrates understanding of flow physics (Poiseuille's law) and central line indications.
Fluid calculations: preoperative deficit (4-2-1 rule, shown working) and intraoperative maintenance volume correctly calculated with appropriate fluid type selection and physiological justification	25 pts	Correct 4-2-1 calculation (65 kg → ~95 mL/h → deficit ~855 mL over 9 h), correct maintenance volume for 3 h, balanced crystalloid chosen with clear rationale avoiding hyperchloraemic acidosis risk of 0.9% saline. Working shown clearly.
Transfusion strategy: MABL calculation, evidence-based transfusion triggers for PRBC/FFP/platelets/cryoprecipitate, appropriately individualised for this patient's comorbidities	25 pts	MABL correctly calculated (EBV 4,550 mL, Hct target justified at 24%/Hb 8 g/dL for cardiovascular comorbidity), thresholds for all four blood products stated with evidence-based values and explicitly individualised for CKD and diabetes.
Risk identification and monitoring: two specific, relevant perioperative risks identified with concrete monitoring parameters and management steps	15 pts	Two specific risks correctly identified (e.g., fluid overload/TACO in CKD, AKI from hypovolaemia); each with specific monitoring parameter (CVP, urine output ≥ 0.5 mL/kg/h, O2 saturation) and management strategy.
Clinical communication: summary paragraph is clear, accurate, and professional — suitable for a surgical team briefing; correct use of clinical terminology	15 pts	Summary is concise (150–200 words), accurate, uses appropriate clinical language, and effectively communicates the fluid strategy and rationale to a surgical colleague without oversimplification.