Pheochromocytoma crisis is a life-threatening endocrine emergency defined as the acute, severe presentation of catecholamine-induced hemodynamic instability causing end-organ damage or dysfunction, with a mortality rate of approximately 14–27%. [1-2] It occurs in 7–18% of patients with pheochromocytoma/paraganglioma (PPGL) and may be the first clinical manifestation of an undiagnosed tumor. [3-4]
1. History
- Classic triad (present in only ~24% of patients): severe headache, palpitations, and diaphoresis [5]
- Paroxysmal or sustained hypertension with episodes of headache, sweating, anxiety, tremor, pallor, nausea/vomiting, and abdominal pain [3][5]
- Timing: Paroxysmal episodes may last minutes to hours; crisis onset is often sudden
- Triggers to ask about: recent surgery, anesthesia, trauma, new medications (especially metoclopramide, beta-blockers, corticosteroids), pregnancy (third trimester/peripartum), physical exertion [3]
- Headache was the most common symptom in a 200-case review (39.5%); nausea and vomiting were significantly associated with higher mortality [1]
- Ask about prior episodes of paroxysmal hypertension, "spells," or unexplained tachycardia
- Important negatives: absence of illicit drug use (cocaine, amphetamines), absence of MAO inhibitor use
2. Alarm Features
- BP ≥180/120 mmHg with evidence of end-organ damage [4]
- Rapidly alternating hypertension and hypotension (hemodynamic lability) [3][6]
- Acute pulmonary edema / flash pulmonary edema [6]
- Chest pain with troponin elevation (catecholamine cardiomyopathy or ACS mimic) [7-8]
- Temperature >40°C with encephalopathy (pheochromocytoma multisystem crisis [PMC]) [6]
- Unexplained cardiogenic shock, especially in a young patient without coronary disease [2][6]
- Lactic acidosis, multi-organ failure, unexplained hyperglycemia [6]
- Cardiac arrest [9]
3. Medications
Crisis-precipitating drugs (AVOID): [3][10]
- Metoclopramide and other dopamine antagonists (D2 blockade triggers catecholamine release)
- Beta-blockers without prior alpha-blockade (causes unopposed alpha stimulation → worsening hypertension) [3]
- Labetalol — alpha-blocking effect is insufficient relative to beta-blockade; can paradoxically worsen crisis [3-4][11]
- Glucagon, sympathomimetics, corticosteroids/synthetic ACTH, tricyclic antidepressants [3]
- General anesthetics, neuromuscular blockers, opiates [12]
Acute crisis treatment: [13-14]
- IV phentolamine 5 mg bolus, repeat q10 min PRN (first-line for catecholamine excess per 2025 AHA/ACC guidelines) [14-15]
- IV nicardipine 5 mg/h, titrate by 2.5 mg/h q5 min (max 15 mg/h) — widely available alternative [14]
- IV nitroprusside 0.3–0.5 mcg/kg/min for refractory hypertension [13-14]
- IV clevidipine — another option per 2025 AHA/ACC for catecholamine excess states [14]
- Esmolol or lidocaine for cardiac arrhythmias — only after adequate alpha-blockade [12-13]
- IV magnesium sulfate — adjunctive for BP and arrhythmia control [3]
- Avoid IV hydralazine (cardiostimulatory, unpredictable) and IV diuretics (unless overt heart failure) [4]
Chronic/preoperative alpha-blockade: [13][16]
- Phenoxybenzamine 10 mg PO BID, titrate up to 30 mg TID
- Doxazosin 1 mg PO daily, titrate up to 10 mg BID
- Beta-blockade added ONLY after adequate alpha-blockade for reflex tachycardia
4. Diet
- High-sodium diet (~5000 mg/day) and generous fluid intake (~2.5 L/day) during preoperative alpha-blockade to counteract catecholamine-induced volume contraction [16]
- Avoid tyramine-rich foods (aged cheeses, cured meats, fermented foods, red wine) — tyramine displaces catecholamines from vesicular storage and can precipitate crisis [12]
- Acute crisis: NPO; IV fluid resuscitation is critical given chronic intravascular volume depletion [3-4]
5. Review of Systems
- Cardiovascular: chest pain, palpitations, dyspnea on exertion, orthopnea, syncope
- Neurologic: headache, visual changes, altered mental status, seizures
- GI: nausea, vomiting, abdominal pain, constipation (catecholamine-mediated ileus)
- Endocrine: weight loss, heat intolerance, hyperglycemia symptoms
- Renal: decreased urine output
- Constitutional: diaphoresis, pallor (not flushing — pallor is characteristic), anxiety, tremor
6. Collateral History and Family History
- Family history of PPGL, medullary thyroid carcinoma, hyperparathyroidism, renal cell carcinoma, hemangioblastomas, neurofibromas [13][16]
- Personal or family history of genetic syndromes: MEN2, VHL, NF1, SDHx mutations [13][16]
- Up to 40% of PPGLs harbor germline pathogenic variants — the highest rate of any solid tumor [17]
- Ask about prior adrenal incidentalomas, prior "spells" dismissed as panic attacks
- Social context: pregnancy status (crisis risk increases in third trimester) [3]
7. Risk Factors
- Hereditary syndromes (account for ~25–40% of cases): [5][17]
- MEN2 (RET): PCC in up to 50%, bilateral tumors common
- VHL: PCC/PGL in 10–20%, earliest age at diagnosis
- SDHx (SDHB, SDHD, SDHC, SDHA): highest metastatic risk (especially SDHB)
- NF1: PCC in ~3%
- TMEM127, MAX
- Young age at presentation (<45 years) [5]
- Bilateral or extra-adrenal tumors [16]
- Tumor hemorrhage or infarction (spontaneous or traumatic) [3]
- Surgical manipulation, anesthesia induction, pregnancy [3]
- Undiagnosed/untreated PPGL undergoing any surgical procedure [18]
8. Differential Diagnosis
- Acute coronary syndrome / STEMI — pheochromocytoma can mimic ACS with ST changes, troponin elevation, and wall motion abnormalities but with normal coronary arteries [7-8]
- Takotsubo (stress) cardiomyopathy — PPGL-related TTS has higher rates of cardiogenic shock (34% vs 4%) and heart failure (47% vs 18%) than non-PPGL TTS [19]
- Thyroid storm — tachycardia, hyperthermia, altered mental status
- Cocaine/amphetamine toxicity — sympathomimetic crisis
- Malignant hypertension from other causes
- Serotonin syndrome or neuroleptic malignant syndrome — hyperthermia, rigidity, autonomic instability
- Carcinoid crisis — flushing (vs pallor in pheo), diarrhea, bronchospasm
- Acute myocarditis from other etiologies
- Septic shock — if presenting with hypotension and multi-organ failure
- Aortic dissection — severe hypertension with tearing chest/back pain
9. Past Medical History
- Prior episodes of paroxysmal hypertension or "spells"
- Known adrenal mass or incidentaloma
- Previous pheochromocytoma resection (recurrence risk)
- History of genetic syndrome components (MTC, hyperparathyroidism, retinal hemangioblastomas, neurofibromas, renal cell carcinoma) [13]
- Prior anesthetic complications or intraoperative hypertensive crises
- Chronic hypertension refractory to standard therapy
10. Physical Exam
Vital signs
- Severe hypertension (often >200/120 mmHg) or labile BP with alternating hypertension/hypotension [3][6]
- Tachycardia (or paradoxical bradycardia)
- Hyperthermia (>40°C in PMC) [6]
Focused exam
- Pallor (not flushing — catecholamine-mediated vasoconstriction) [5]
- Diaphoresis, tremor, anxiety
- Cardiac: S3 gallop, pulmonary crackles (acute heart failure), new murmur
- Abdominal: palpable mass (rare; avoid vigorous palpation — can trigger catecholamine surge)
- Neurologic: altered mental status, focal deficits (stroke), papilledema
- Skin: café-au-lait spots, neurofibromas (NF1), mucosal neuromas (MEN2B) [13][16]
- Marfanoid habitus (MEN2B) [16]
11. Lab Studies
Diagnostic: [3][5][13]
- Plasma free metanephrines (preferred in acute setting — sensitivity >96%)
- 24-hour urine fractionated metanephrines and catecholamines (if patient stabilized)
- Levels in crisis are typically extremely elevated (mean 23× upper limit of normal in one series) [3]
Assess end-organ damage
- Troponin (catecholamine cardiomyopathy, demand ischemia)
- BNP/NT-proBNP (heart failure)
- BMP/CMP (renal function, hyperglycemia, electrolytes)
- Lactate (lactic acidosis — common in severe crisis) [6]
- CBC, coagulation studies
- Liver function tests (hepatic injury in multi-organ failure)
- Blood glucose (hyperglycemia is characteristic; hypoglycemia may occur post-resection) [13]
Monitoring
- Serial troponin, lactate, renal function
- Glucose monitoring (especially perioperatively)
12. Imaging
- CT abdomen/pelvis with IV contrast — first-line to identify adrenal mass; diagnostic in 33/34 ICU patients in one series. Low-osmolar contrast does not appreciably trigger catecholamine release [2-3]
- MRI abdomen — preferred for paragangliomas, pediatric patients, pregnant patients, and surveillance
- Bedside ultrasound — may identify adrenal mass in unstable patients too ill to transport [3]
- CT head — if neurologic symptoms (rule out hemorrhagic/ischemic stroke)
- CT angiography chest — if aortic dissection or pulmonary embolism suspected [20]
- Functional imaging (¹²³I-MIBG, ⁶⁸Ga-DOTATATE PET/CT) — not indicated acutely; used for staging and metastatic workup after stabilization [21]
13. Special Tests
- Echocardiography — critical in crisis; median LVEF 30% in ICU cohort. Assess for Takotsubo pattern (apical ballooning or inverted/basal pattern, which is more common in PPGL-related TTS), dilated cardiomyopathy, or regional wall motion abnormalities [2][19]
- Coronary angiography — if ACS suspected; typically shows normal coronary arteries in catecholamine cardiomyopathy [7-8]
- Genetic testing — recommended for ALL patients with PCC/PGL per NCCN guidelines [13]
- SOFA/SAPS II scoring — for ICU severity stratification [2]
14. ECG
ECG findings in pheochromocytoma crisis: [7][19]
- Sinus tachycardia (most common arrhythmia)
- ST-segment elevation or depression mimicking acute MI
- T-wave inversions (diffuse or regional)
- Prolonged QTc (risk for torsades de pointes)
- Low voltage QRS
- Atrial fibrillation/flutter
- Ventricular tachycardia (life-threatening)
- Bradyarrhythmias (less common)
Key pearl: ECG changes mimicking STEMI with elevated troponin but normal coronary arteries should raise suspicion for pheochromocytoma, especially in younger patients without traditional cardiovascular risk factors. [8][22]
15. Assessment
Severity classification (Whitelaw et al.): [3]
- Type A crisis: Hemodynamic instability without sustained hypotension (4× more common)
- Type B crisis: Sustained hypotension, shock, and multi-organ dysfunction (higher mortality)
- Pheochromocytoma multisystem crisis (PMC): Hyperthermia + multi-organ failure + encephalopathy + labile BP (19% of all crisis cases, highest mortality) [1]
The heart is the most commonly damaged organ (99%), followed by lungs (44%) and kidneys (21.5%). [1] Cardiovascular complications include catecholamine cardiomyopathy (up to 11%), Takotsubo syndrome, acute MI, arrhythmias, pulmonary edema, and aortic dissection. [6][23-24] The adrenergic phenotype (epinephrine-secreting) is more associated with Takotsubo and tachyarrhythmias, while the noradrenergic phenotype is more associated with atherosclerotic complications and flash pulmonary edema. [4][25]
16. Treatment Plan
Initial stabilization: [3-4][13-14]
- ICU admission with continuous arterial BP monitoring and telemetry
- IV fluid resuscitation — aggressive volume expansion (chronic intravascular depletion from catecholamine-mediated vasoconstriction)
- IV alpha-blockade first:
- Phentolamine 5 mg IV bolus q10 min PRN (max 50 mg/24h) [14]
- OR nicardipine 5–15 mg/h IV infusion [14]
- OR nitroprusside 0.3–10 mcg/kg/min for refractory hypertension [13]
- Beta-blockade ONLY after adequate alpha-blockade — esmolol preferred (short-acting, titratable) for tachyarrhythmias [3][13]
- Arrhythmia management: esmolol or lidocaine for ventricular arrhythmias; magnesium sulfate as adjunct [3][13]
- Cardiogenic shock: consider VA-ECMO as bridge to recovery — survival rate ~93.5% in published series with full LVEF recovery in survivors; Impella or other mechanical circulatory support [26]
- CRRT — for catecholamine removal and acute kidney injury [9]
BP targets: Reduce SBP by ~25% in the first hour, then gradually to <140 mmHg over 24–48 hours. [14] Avoid aggressive lowering to <120 mmHg in the first hour (unlike aortic dissection).
Definitive treatment: Surgical resection after medical stabilization with 7–14 days of alpha-blockade, volume repletion, and high-salt diet. [13][16] Emergency adrenalectomy carries significant morbidity and should be avoided if possible. [18]
The NCCN algorithm for pheochromocytoma management is shown below:
17. Disposition
- All pheochromocytoma crises require ICU admission [2]
- Admission criteria: any hemodynamic instability, end-organ damage, arrhythmia, cardiomyopathy, multi-organ dysfunction
- VA-ECMO should be considered early in refractory cardiogenic shock [2][26]
- Urgent/emergent adrenalectomy only if medical management fails and patient is deteriorating despite maximal support [18]
- Endocrinology, cardiology, and surgical (endocrine surgery or urology) consultation
- Transfer to a center with ECMO capability if cardiogenic shock is refractory
18. Follow Up / Return Precautions
- Postoperative monitoring: Watch for hypotension (loss of catecholamine drive) and hypoglycemia (rebound insulin effect) — treat with IV fluids and dextrose [13]
- After resection, repeat plasma/urine metanephrines at 2–6 weeks to confirm biochemical cure
- Long-term surveillance: annual biochemical screening (metanephrines) lifelong, as recurrence can occur years later [13]
- Genetic testing and counseling for all patients — up to 40% have germline mutations [13][17]
- If hereditary syndrome confirmed, initiate syndrome-specific surveillance for patient and at-risk family members (per NCCN) [13]
- Medical alert ID recommended for patients with hormonally secreting tumors in situ or metastatic disease [13]
- Return precautions: recurrent headache, palpitations, diaphoresis, chest pain, severe hypertension, visual changes, or any "spell" — seek immediate evaluation
References
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