Complex Patient Assessment

Integrated Care & The Biopsychosocial Model

1. Defining the Complex Patient

No one patient is the same. Complexity cannot be fractionated into isolated medical conditions; it must be viewed holistically through the Biopsychosocial (BPS) Model.

The Biopsychosocial (BPS) Model

  • Biological: The relationship between disease, health conditions, and physical bodily health.
  • Psychological: Aspects of mental and emotional wellness that relate to behaviour (e.g., motivation, depression, anxiety, chronic stress).
  • Social: Interpersonal factors, community activities, and environmental constraints (e.g., isolation, imbalanced lifestyle, poverty).

Key Characteristics of Complexity

Complex patients generally present with a combination of the following layers:

  • Multimorbidity: The presence of two or more chronic conditions that actively interact and influence each other (e.g., Diabetes + Heart Failure).
  • Polypharmacy: The use of multiple medications, massively increasing the risk of adverse drug interactions and toxic side effects.
  • Mental Health Co-morbidities: Physical illnesses complicated by conditions like depression or cognitive impairment (dementia).
  • Social Vulnerability: Low income, homelessness, food insecurity, and poor social support networks.
  • Functional Limitations: Difficulty performing Activities of Daily Living (ADLs) due to physical or cognitive decline.

2. Modifying the Assessment Approach

Acute vs. Subacute Management Paradigms

Acute Management Subacute Management
You are fighting against time. Managing multiple pathologies alongside social/mental health concerns simultaneously. Requires a combination of Type 1 (fast, intuitive) and Type 2 (slow, analytical) thinking. You are managing the same multiple pathologies, but not under immediate time pressure. Focus shifts heavily to risk planning, stratification, and disposition. Requires dedicated Type 2 analytical thinking.

Modifying the Primary & Secondary Survey

Patient complexity radically alters standard presentations. Paramedics must anticipate atypical presentations, masked signs, false positives, and false negatives.

  • Masked Signs (False Negatives): Beta-blockers may mask the expected tachycardia of hypovolaemic shock. Corticosteroids or advanced age may mask a fever during severe sepsis.
  • Atypical Presentations: An elderly diabetic patient experiencing a myocardial infarction may present only with sudden confusion or nausea (silent MI), rather than classic crushing chest pain.
  • Sequencing the Survey: The primary survey remains C-ABCDE, but the secondary survey requires heavy integration of objective data (e.g., old ECGs, historical discharge summaries) with subjective data (collateral history from carers) to paint an accurate clinical picture.
  • Indicators of Improvement/Stability: Improvement may not mean returning to "textbook normal," but rather returning to the patient's unique baseline (e.g., clearing a delirium back to baseline mild cognitive impairment).

3. Red Flags, Screening & Social Vulnerability

Clinical and Contextual 'Red Flags'

During history taking, paramedics must actively listen for contextual red flags that signal a high risk for rapid deterioration or systemic failure:

  • Fragmented Care: A lack of communication between GPs, specialists, and hospitals, leading to duplicate medications or opposing treatment plans.
  • Non-Adherence: "Non-compliance" is rarely just stubbornness. It is often a red flag for cognitive decline, health illiteracy, or financial inability to afford medications.
  • Frequent Healthcare Utilization: The "frequent flyer" is a red flag for complex, unmet psychosocial or medical needs that the current system is failing to address.
  • Carer Burnout / Vulnerability: When the patient is the sole carer for another vulnerable person (or vice versa) and the support system collapses.

The Role of Screening and Case-Finding Tools

To accurately identify the complications of complexity, paramedics must utilize specific screening tools beyond standard vital signs:

  • Frailty Scales: Identifying patients who lack the physiological reserve to bounce back from minor stressors (e.g., a simple UTI causing a severe mechanical fall).
  • Cognitive Screening (e.g., AMTS, 4AT): Distinguishing acute delirium (a medical emergency) from chronic progressive dementia.
  • Psychosocial & Safety Screens: Identifying signs of elder abuse, domestic violence, malnutrition (e.g., empty fridge, loose dentures), and pressure injuries (checking dependent areas during patient movement).

4. Clinical Vignette: The Conflict of Multimorbidity

Patient: Malcolm, 67 years old.

History: Ischaemic cardiomyopathy (EF 28%), Insulin-dependent Type 2 diabetes, CKD stage 3, Atrial Fibrillation (AF).

Presentation: SOB, vomiting, confusion, ketotic breath, Kussmaul breathing. HR 130 (irregular), BP 98/56, RR 32, SpO2 86% RA, BGL 28 mmol/L, Temp 37.8°C, GCS 13.

Pathophysiology Breakdown: Competing Crises

  • Diabetic Ketoacidosis (DKA): Absolute/relative insulin deficiency → lipolysis → massive ketone production. This causes a severe metabolic acidosis and profound dehydration from osmotic diuresis. The Kussmaul respirations are a compensatory attempt to blow off CO2.
  • Congestive Cardiac Failure (CCF) with Pulmonary Oedema: Impaired LV systolic function (EF 28%) → elevated pulmonary capillary hydrostatic pressure → fluid shifts into alveoli. Tachycardia (from AF and DKA stress) reduces cardiac output further, worsening renal perfusion, activating RAAS, and worsening the pulmonary oedema.
  • Electrolyte Imbalance (The Silent Killer): DKA causes massive total body Potassium (K+) depletion. However, serum levels initially look normal or high because acidosis pushes K+ out of cells. If insulin is given without checking/replacing K+, Potassium shifts rapidly back into cells, causing lethal hypokalemia-induced arrhythmias (especially dangerous given his existing AF).

Paramedic Management Plan: Balancing Act

Step Clinical Action Rationale / Notes
Airway/Breathing High-flow O2, consider CPAP. Improves oxygenation and increases intrathoracic pressure to reduce venous return (preload) for the pulmonary oedema.
Circulation Careful IV access, cautious fluids. The Dilemma: DKA demands massive volume replacement, but CCF means his heart cannot handle fluid loading (EF 28%). Fluids must be titrated carefully to avoid drowning the patient.
Disability Monitor GCS closely. Patient may rapidly deteriorate from hypoxic encephalopathy, worsening acidosis, or cerebral oedema.
Specific Meds Withhold insulin until K+ is known. Requires Bloods (VBG, EUC, K+, Trop) in hospital. Start insulin infusion only once K+ > 3.5 mmol/L to prevent cardiac arrest.
Disposition Pre-alert for ICU/HDU. Requires complex critical care, continuous cardiac monitoring, diuresis, and strict electrolyte titration.

Social Complexity Integration

Malcolm's medical deterioration did not happen in a vacuum. A holistic BPS assessment reveals the actual root causes of the acute DKA crisis:

  • Unreliable insulin storage (Power was disconnected due to poverty → ruined insulin → DKA trigger).
  • Limited English (Risk of miscommunication leading to delayed presentation).
  • Carer for adult son (Resulted in self-neglect and missed chronic disease appointments).
  • Action: Beyond medical stabilization, paramedics must initiate a social worker referral to address the unsafe home environment and integrate chronic disease services to prevent readmission.