Management of 150 bpm Tachycardia in Geriatric Patients

Initial Critical Assessment

• Immediately assess hemodynamic stability (mental status, chest pain, heart failure signs, blood pressure) and obtain a 12‑lead ECG in any geriatric patient presenting with a heart rate of 150 bpm. [1][2]
• Signs of instability to look for: acute altered mental status, ischemic chest pain, acute heart failure, hypotension or shock. [1][2]
• Evaluate oxygenation and respiratory effort (tachypnea, intercostal retractions, paradoxical abdominal breathing) because hypoxemia is a common reversible trigger. 2
• Connect cardiac monitor, measure blood pressure, and establish intravenous access without delay. 2

Decision Algorithm Based on Stability

Unstable Patient

• Perform immediate synchronized cardioversion when any of the following are present: altered mental status, ischemic chest pain, acute heart failure, or hypotension/shock. 1
• Prior to cardioversion (if time permits), obtain IV access and administer sedation if the patient is conscious. 1
• Do not postpone cardioversion in a markedly unstable patient. 1

Stable Patient

• Obtain a 12‑lead ECG promptly to classify the rhythm. 3

ECG Interpretation

• QRS duration < 0.12 s indicates a supraventricular tachycardia; QRS ≥ 0.12 s suggests a ventricular tachycardia. 2
• Assess P‑wave morphology and its relationship to the QRS complexes to aid rhythm identification. 3
• Look for pre‑excitation (delta waves) that would indicate Wolff‑Parkinson‑White syndrome and require urgent cardiology referral. 3

Underlying Causes in the Elderly

• Do not start negative‑chronotropic drugs until reversible causes are ruled out. 3
• Common physiological precipitants: fever or infection, dehydration, anemia, pain, and hypoxemia. [3][5]2
• Screen for hyperthyroidism by measuring TSH. 3
• Recognize compensatory sinus tachycardia in patients with poor cardiac output; lowering the rate may be harmful. 1

Specific Arrhythmias

Sinus Tachycardia

• Defined as a rate > 100 bpm originating from the sinus node. 1
• Upper age‑related limit ≈ 220 – age (years). 1
• No specific anti‑arrhythmic therapy is required; treat the underlying trigger. 1

Supraventricular Tachycardia (SVT)

• In a hemodynamically stable patient with a regular narrow‑complex tachycardia, a trial of adenosine is appropriate while preparing for possible cardioversion (Class IIb). 1
• Adenosine dosing: 6 mg rapid IV push followed by saline flush; repeat with 12 mg if needed. 2

Atrial Fibrillation

• Presents as an irregular narrow‑complex rhythm. 2

Additional Diagnostic Studies (All Geriatric Patients with HR ≈ 150 bpm)

• Transthoracic echocardiography to detect structural heart disease not evident on physical exam or ECG. [3][5]
• Serum TSH to exclude hyperthyroidism. [3][5]
• Basic metabolic panel and complete blood count to identify electrolyte disturbances, anemia, or infection. 1

Urgent Referral to Cardiology

• Pre‑excitation suggestive of WPW syndrome. 3
• Wide‑complex tachycardia of unknown origin. 2
• Syncope occurring during tachycardia or with exertion. 3
• Documented sustained supraventricular tachycardia. 3

Ambulatory Rhythm Monitoring (Recurrent Episodes)

Common Pitfall to Avoid

• Do not normalize heart rate with β‑blockers or calcium‑channel blockers in compensatory sinus tachycardia; reducing rate in patients with limited stroke volume can precipitate cardiogenic shock. 1