Pulse Going Up and Down - Cardiac Arrhythmia: Causes and Treatment

"Pulse going up and down" describes an irregular or fluctuating heart rate, which is a classic sign of a cardiac arrhythmia - an abnormal electrical rhythm of the heart. This can mean the rate is too fast (tachycardia), too slow (bradycardia), or irregularly irregular.

Step 1: First - Identify the Type of Arrhythmia

Before treatment, the ECG (electrocardiogram) is the single most important test. You must know the specific arrhythmia before treating it.

Common arrhythmias causing an irregular pulse:

Atrial Fibrillation (AFib) - most common; irregularly irregular pulse
Premature Ventricular/Atrial Contractions (PVC/PAC) - "skipped beat" sensation
Supraventricular Tachycardia (SVT) - sudden fast rate, then sudden slow
Ventricular Tachycardia (VT) - dangerous, fast and life-threatening
Sinus Arrhythmia - benign variation with breathing
Tachy-Brady Syndrome - alternating fast and slow rates (sick sinus syndrome)

Step 2: Emergency Assessment

Ask:

Is the patient hemodynamically stable? (conscious, normal BP, no chest pain)
Any syncope/fainting, breathlessness, chest pain?
Any underlying heart disease?

If the patient is unstable (low BP, unconscious, severe symptoms) - this is a medical emergency. Call emergency services immediately. Consider synchronized cardioversion.

Step 3: Treatment by Arrhythmia Type

A. Atrial Fibrillation (AFib) - most common cause of irregular pulse

Goal	Treatment
Rate Control	Beta-blockers (metoprolol, atenolol), Calcium channel blockers (diltiazem, verapamil), Digoxin
Rhythm Control	Amiodarone, Flecainide, Propafenone, Sotalol
Stroke Prevention	Anticoagulants - Warfarin or DOACs (rivaroxaban, apixaban, dabigatran)
Cardioversion	Electrical (DC cardioversion) if unstable or persistent

B. Supraventricular Tachycardia (SVT) - rapid pulse that comes and goes

Treatment	Details
Vagal maneuvers	Valsalva, carotid sinus massage (first line, non-drug)
Adenosine (IV)	Drug of choice for acute termination - 6 mg IV rapid push; may cause chest flushing
Verapamil / Diltiazem (IV)	If adenosine fails
Beta-blockers	For prevention
Catheter ablation	Curative for recurrent SVT

C. Premature Beats (PVCs/PACs) - feel like "skipped" beats

If no underlying heart disease: usually no treatment needed; reassurance and lifestyle changes
Avoid caffeine, alcohol, stress, smoking
If symptomatic: Beta-blockers are first line
Frequent PVCs with cardiomyopathy: refer to cardiologist

D. Bradycardia (Slow pulse causing dips)

Severity	Treatment
Mild, asymptomatic	Observation, treat underlying cause
Symptomatic (dizziness, fainting)	Atropine 0.5 mg IV (repeat up to 3 mg)
Refractory / complete heart block	Temporary or permanent pacemaker

E. Ventricular Tachycardia (VT) - serious

Pulseless VT: Immediate defibrillation + CPR
VT with pulse: Amiodarone 150 mg IV over 10 min; or synchronized cardioversion
Long-term: ICD (Implantable Cardioverter Defibrillator)

Step 4: Antiarrhythmic Drug Classes (Vaughan-Williams Classification)

Class	Mechanism	Examples	Used For
Ia	Na channel block (moderate)	Quinidine, Procainamide, Disopyramide	AF, VT, SVT
Ib	Na channel block (fast)	Lidocaine, Mexiletine	Acute VT
Ic	Na channel block (slow)	Flecainide, Propafenone	AF, AFL, SVT
II	Beta-blockade	Metoprolol, Atenolol	SVT, AF rate control
III	K channel block	Amiodarone, Sotalol	AF, VT, SVT
IV	Ca channel block	Verapamil, Diltiazem	SVT, AF rate control
Other	Direct node inhibition	Digoxin, Adenosine	AF, acute SVT

Important warning: Antiarrhythmic drugs can themselves cause arrhythmias (proarrhythmia). The CAST study showed that some class Ic drugs increased mortality in post-MI patients. Always individualize treatment. - Katzung's Basic and Clinical Pharmacology, 16th Ed

Step 5: Non-Drug / Interventional Treatments

Procedure	Indication
Electrical Cardioversion	AFib, AFL, unstable SVT/VT
Catheter Ablation	SVT (curative), AFib, VT
Pacemaker	Bradycardia, sick sinus syndrome, heart block
ICD (Defibrillator)	Ventricular tachyarrhythmias, sudden death risk

Step 6: Lifestyle and Reversible Causes to Address

Treat underlying triggers:

Electrolyte imbalance - correct low K+, Mg²+
Thyroid disease - hyperthyroidism causes tachyarrhythmias
Ischemia/MI - revascularize
Heart failure - optimize treatment
Avoid: caffeine, alcohol, stimulants, certain drugs (TCA antidepressants, QT-prolonging drugs)

Key Clinical Principle

"The mere identification of an abnormal cardiac rhythm does NOT necessarily require treatment. The urgency of treatment depends on the physiologic consequences of the arrhythmia." - Textbook of Family Medicine, 9th Ed / Katzung's Pharmacology, 16th Ed

Bottom line: Get an ECG first, identify the arrhythmia type, assess hemodynamic stability, then treat accordingly. If in doubt or the patient is unstable - this is an emergency requiring immediate medical attention.

Disclaimer: This is educational information. A real patient with irregular pulse should be evaluated by a doctor immediately, especially if they have chest pain, breathlessness, fainting, or feel unwell.

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