Clinical Case Analysis

Q1: Most Likely Diagnosis

• Fever >38°C (38.9°C) ✓
• Tachycardia >90 bpm (HR 104) ✓
• Tachypnea >20 breaths/min (RR 28) ✓
• Likely leukocytosis (not stated, but strongly implied)

• Altered mental status (acute change from baseline per daughter) - neurologic organ dysfunction
• Hypoxia (SpO2 91% requiring supplemental O2) - pulmonary dysfunction
• Tachycardia, fever
• Source: pneumonia (productive cough, fever, tachypnea, hypoxia, nursing home resident)

• Altered mentation: +1 ✓
• RR ≥22: +1 ✓
• SBP ≤100: 0 (BP is 130/85, so not yet hypotensive)

Q2: How Should This Patient Be Managed?

1. Immediate Resuscitation (within the first hour)

• IV access + Labs: Blood cultures x2 sets (before antibiotics), CBC, BMP, lactate, procalcitonin, blood gas, urinalysis, sputum culture, chest X-ray
• Lactate: If >2 mmol/L, confirms tissue hypoperfusion and guides resuscitation targets
• IV fluids: At least 30 mL/kg IBW crystalloid (preferably lactated Ringer's, which has shown lower rates of renal dysfunction vs. normal saline) within the first hour. Caution is needed given her mild lower extremity edema - monitor closely for volume overload
• Oxygen: Escalate as needed (she is at 91% on 3L NC - may need higher flow or non-invasive positive pressure ventilation)

2. Antibiotics - Start Within 1 Hour

• Beta-lactam (e.g., piperacillin-tazobactam or ceftriaxone) + respiratory fluoroquinolone (e.g., levofloxacin) or azithromycin
• Consider MRSA coverage (vancomycin) if risk factors present (prior MRSA, prior antibiotics, empyema)
• Adjust based on culture results

3. Hemodynamic Monitoring and Vasopressors (if needed)

• Target MAP ≥65 mm Hg
• If BP drops despite fluids: Norepinephrine is the first-line vasopressor (preferred over dopamine due to fewer adverse events)
• Vasopressin as second-line adjunct

4. Biomarker-Guided Therapy

• Procalcitonin (PCT) >0.5 ng/mL supports bacterial infection; can be used to guide antibiotic duration and de-escalation
• Serial lactate measurements to confirm clearance (target lactate normalization)

5. Source Control

• Identify and treat the infectious source (pneumonia in this case - chest X-ray/CT chest)
• Rule out other sources (UTI given age and diabetes; diabetic foot given background DM)

6. Ongoing Monitoring

• Strict ins/outs, close monitoring of urine output (target ≥0.5 mL/kg/hr)
• Repeat neurological assessment
• ICU-level care or step-down unit given her mental status change and hypoxia
• Glucose management (she has diabetes) - insulin protocol to maintain euglycemia
• Consider low-dose corticosteroids (hydrocortisone 200 mg/day) only if hemodynamic instability persists despite fluids and vasopressors

7. Supportive Care

• DVT prophylaxis (note: no calf tenderness, but still at risk)
• Aspiration precautions (nursing home patient, altered mental status)
• Family communication regarding prognosis

70-Year-Old Woman from Nursing Home - Full Clinical Analysis

Q1. Most Likely Diagnosis

Sepsis secondary to Nursing Home-Acquired Pneumonia (NHAP)

Q2. Differential Diagnoses

Primary differentials to consider and how to distinguish:

1. Pulmonary Embolism (PE)

• Similarities: Dyspnea, tachycardia, hypoxia, tachypnea, altered mentation
• Against: Fever and productive cough are not typical of PE; no calf tenderness (lower extremity edema is mild); no JVD (massive PE would cause RV strain with JVD)
• Workup: D-dimer, CT pulmonary angiogram (CTPA) if clinical suspicion remains after Wells score
• Key distinguishing test: CTPA

2. Acute Decompensated Heart Failure (ADHF) / Cardiogenic Pulmonary Edema

• Similarities: Dyspnea, tachycardia, hypoxia, lower extremity edema
• Against: No S3 or S4, no JVD, warm/dry skin (not the cool/clammy of cardiogenic shock), productive cough more typical of infection than "pink frothy" of pulmonary edema, fever argues against primary HF
• Workup: BNP/NT-proBNP, chest X-ray (Kerley B lines, cardiomegaly), echo

3. COPD/Asthma Exacerbation

• Similarities: Dyspnea, hypoxia, tachypnea, tachycardia
• Against: No history of obstructive lung disease mentioned; productive cough with fever points to infection
• Workup: Spirometry, peak flow, response to bronchodilators

4. Diabetic Ketoacidosis (DKA) / Hyperosmolar Hyperglycemic State (HHS)

• Similarities: Altered mental status, tachycardia, tachypnea (Kussmaul breathing in DKA), fever possible if infection-triggered
• Against: No mention of fruity breath, vomiting, or polyuria; but DM history means this could co-exist as a precipitant
• Workup: Blood glucose, ABG (pH, bicarb), urine/serum ketones, BMP

5. Aspiration Pneumonia/Pneumonitis

• Similarities: Productive cough, fever, hypoxia in a nursing home resident
• Overlap: Often co-exists with or triggers sepsis; aspiration is common in elderly nursing home residents with altered mentation
• Note: This may be the specific etiology of the pneumonia causing sepsis (not truly a separate diagnosis)

6. Meningitis/Encephalitis

• Relevance: Acute altered mental status + fever
• Against: No nuchal rigidity, no headache, no photophobia mentioned; respiratory symptoms more prominent
• Workup: LP if CNS source cannot be excluded after initial evaluation

7. Urinary Tract Infection (UTI) / Urosepsis

• Relevance: Elderly diabetic women are at very high risk of UTI-related sepsis
• Note: Should be worked up in parallel, as UTI may be the primary source or co-exist
• Workup: Urinalysis and urine culture (should be sent regardless)

Q3. Treatment

HOUR-1 BUNDLE (do all within 60 minutes)

• Draw serum lactate immediately
• If >2 mmol/L: tissue hypoperfusion confirmed; target lactate clearance as a resuscitation endpoint
• If >4 mmol/L: very high-risk, even if not yet hypotensive

• Draw at least 2 sets of blood cultures (peripheral + IV line)
• Also send: sputum culture, urinalysis + urine culture
• Do NOT delay antibiotics more than 45 minutes waiting for cultures

• Beta-lactam: Piperacillin-tazobactam (pip-tazo) OR ceftriaxone 1-2g IV
• Plus: Azithromycin 500mg IV OR levofloxacin 750mg IV (atypical coverage)
• Add vancomycin if: MRSA risk (prior MRSA, recent hospitalization, purulent sputum)
• Adjust regimen when culture/sensitivity results return (de-escalate!)
• Procalcitonin (PCT) >0.5 ng/mL supports bacterial infection; use to guide antibiotic duration

• 30 mL/kg IBW of IV crystalloid within the first hour
• Preferred: Lactated Ringer's solution (balanced crystalloid - shown to reduce renal dysfunction vs. normal saline in RCT)
• Caution: She has mild edema - monitor closely, reassess volume responsiveness after each 500 mL bolus
• Use dynamic measures (pulse pressure variation, passive leg raise) to assess ongoing volume responsiveness
• Albumin has NOT shown benefit over crystalloid in sepsis

• First-line: Norepinephrine (preferred over dopamine - dopamine has more adverse events)
• Target MAP ≥65 mmHg
• Second-line: Vasopressin as adjunct to norepinephrine
• Third-line/adjunct: Epinephrine for refractory shock

• Current: 3L NC with SpO2 91% - escalate oxygen delivery
• Options in order: high-flow nasal cannula (HFNC) → non-invasive positive pressure ventilation (NIPPV/BiPAP) → intubation with mechanical ventilation if deteriorating
• Target SpO2 >94%

ONGOING MANAGEMENT

THINGS TO AVOID

• Dopamine (more arrhythmias than norepinephrine)
• Albumin (no proven benefit over crystalloid)
• Routine red cell transfusion to Hct >30% (prior early goal-directed therapy practice - no longer recommended)
• Excessive fluid after initial resuscitation without reassessing volume responsiveness

Short Notes - 70F Nursing Home Case

Q1. Most Likely Diagnosis

• Fever + productive cough = infectious source (lungs)
• Meets qSOFA ≥2: altered mentation + RR >22
• Meets SIRS: fever, tachycardia (HR 104), tachypnea (RR 28)
• Organ dysfunction: altered mental status + hypoxia (SpO2 91%)
• NOT yet septic shock (BP still normal)

Q2. Differential Diagnoses

Q3. Treatment (Surviving Sepsis Campaign - Hour-1 Bundle)

🔬 Diagnose

• Serum lactate (target normalization)
• Blood cultures x2 before antibiotics
• CBC, BMP, ABG, procalcitonin
• Chest X-ray, urinalysis + urine culture

💊 Antibiotics (within 1 hour)

• Piperacillin-tazobactam IV + azithromycin IV
• Add vancomycin if MRSA risk
• De-escalate once cultures return

💧 Fluids

• 30 mL/kg IV lactated Ringer's within 1 hour
• Monitor for fluid overload (edema present)

💉 Vasopressors (if MAP <65 despite fluids)

• Norepinephrine - first line
• Vasopressin - second line adjunct

🫁 Oxygen

• Escalate: HFNC → BiPAP → intubation
• Target SpO2 >94%

🏥 Supportive

• ICU admission, strict I&Os, Foley
• Glucose control (insulin, target 140-180 mg/dL)
• DVT prophylaxis
• Hydrocortisone 200 mg/day only if still hemodynamically unstable despite above

Instrumental (Investigative) Tests

For This Case: Sepsis from Nursing Home-Acquired Pneumonia

🩸 Laboratory Tests (Blood)

🧪 Urine Tests

🫁 Respiratory/Microbiological Tests

📷 Imaging

❤️ Cardiac Monitoring

📊 Severity Scoring Tools (Using Test Results)

Priority Order in ED

IMMEDIATE (0-30 min)
├── Blood cultures x2
├── Serum lactate
├── ABG
├── Blood glucose
├── ECG
└── Chest X-Ray

URGENT (30-60 min)
├── CBC, BMP, LFTs, coagulation
├── Procalcitonin, CRP, BNP
├── Urinalysis + urine culture
├── Sputum culture
└── Legionella/pneumococcal antigen

IF INDICATED
├── CTPA (if PE suspected)
├── Echocardiogram (if hemodynamically unstable)
└── CT chest (if CXR inconclusive)

Clinical Case Analysis - 19-Year-Old Male

Q1. Most Likely Diagnosis

Diabetic Ketoacidosis (DKA) - Severe

Diagnostic Criteria - ALL MET:

Why NOT Hyperosmolar Hyperglycemic State (HHS)?

• HHS occurs mainly in elderly T2DM patients
• HHS has bicarb >18, no significant ketosis
• This patient has bicarb of 6 = severe ketoacidosis - rules out HHS
• Age 19 + new presentation = T1DM in DKA

Corrected Sodium:

• For every 100 mg/dL glucose above 100: add 1.6 mEq/L to measured Na
• Glucose excess = 740 - 100 = 640 → 640/100 × 1.6 = +10.2 mEq/L
• Corrected Na = 124 + 10 = ~134 mEq/L (normal - hyponatremia is dilutional)

Q2. Next Steps (Management)

STEP 1 - Confirm Diagnosis (Immediate Labs)

STEP 2 - IV Fluid Resuscitation (PRIORITY #1)

• 0.9% Normal Saline: 1 L bolus immediately (BP 82/40 = hypotensive shock)
• Then 500-1000 mL/h while cardiac and renal function are normal
• Once volume restored: switch to 0.45% saline at 150-500 mL/h to replenish free water deficit
• Fluid deficit typically 7-9% of body weight in DKA
• Add Dextrose 5% when glucose falls below 250 mg/dL (to allow continued insulin without causing hypoglycemia)

STEP 3 - Insulin (after K confirmed >3.5 mEq/L)

⚠️ Do NOT start insulin if K <3.5 mEq/L - insulin drives K into cells and can cause fatal hypokalemia/cardiac arrest

• His K = 3.4 mEq/L → Replace potassium FIRST, then start insulin
• Bolus: Regular insulin 0.1 units/kg IV
• Infusion: Regular insulin 0.1 units/kg/hr IV (100 units in 100 mL NS = 10 mL/hr)
• Goal: Glucose drop of 50-75 mg/dL per hour
• Do NOT correct >100 mg/dL/hr (risk of cerebral edema/osmotic encephalopathy)
• Continue infusion until: HCO3 >15 mEq/L + anion gap closed + clinical improvement
• Give subcutaneous basal insulin 2 hours BEFORE stopping infusion

STEP 4 - Potassium Replacement

• Current K = 3.4 mEq/L (low-normal, will drop further with insulin)
• Add KCl 10-20 mEq/hour to IV fluids
• Target K: 3.5-5.0 mEq/L
• Monitor K every 1-2 hours

STEP 5 - Monitor and Avoid Complications

STEP 6 - Find and Treat Precipitant

• This young patient likely has new-onset Type 1 DM - the "flu" was the trigger
• Send: blood cultures, urinalysis, CXR (already normal), viral panel
• Consider: pancreatitis (amylase normal here), MI (ECG done - sinus tach only)

⚠️ Bicarbonate?

• Bicarb of 6 is severe - consider bicarb only if pH <6.9, severe shock, or life-threatening hyperkalemia
• NOT routinely recommended in DKA

Summary - "FIKA" Protocol