Sick-Tachy or Tachy-sick: S.T.O.P. Secondary Compensations (Must-consider Differentials)

When the heart rate blasts past 150, our reflex is often to grab a syringe—diltiazem, metoprolol, something to slow things down. But here’s the hard truth: if the patient is in sick-tachy—tachycardia as a secondary compensation—slamming them with rate control can be catastrophic. That racing heart rate may be the only thing keeping them alive. Pausing to ask “sick-tachy or tachy-sick?” is what separates the new learner from the confident emergency clinician.This episode is all about STOP-ping before you treat the number. STOP is your mnemonic for the must-consider secondary compensations that drive tachycardia in the ED. Each of these can mimic or mask primary arrhythmias, and missing them can lead to disaster:⸻🛑 STOP MnemonicS – Sepsis • Tachycardia is often the earliest sign of infection. • Always check a lactate—“Lactic Acid” should be etched in your mind. • Bundle: fluids + source control. • Be cautious in elderly or vague abdominal presentations; tachycardia may be your only clue.T – Thyroid Storm • Look for agitation, fever, tremor, weight loss history. • Order TSH/T3/T4. • Treatment anchor: Beta-blockers (BB) are first-line for rate control here—unique compared to other scenarios. • Missing thyroid storm means missing a reversible cause of near-fatal tachycardia.O – HypOvolemia • Think bleeding (low H/H), dehydration, or anemia. • Visual: half water / half blood glass—“Fill the Tank.” • Don’t just reach for meds—give fluids, transfuse, and stabilize volume first. • Remember also anxiety/pain can amplify sympathetic tone.P – Pulm/Cards (Cardiopulmonary) • Pneumonia – fever, infiltrate, hypoxia. • Pneumothorax – sudden pleuritic chest pain, absent breath sounds. • PE – unexplained hypoxia, pleuritic pain, risk factors. • CHF (low EF) – the most dangerous one to miss before you push AV nodal blockers. • Workup tools: ABG, BNP, CTPA, CXR, POCUS.⸻🧠 Why This Matters • Sinus tachycardia is often appropriate—but it can mask life-threatening systemic illness. • Medicating away compensation without treating the cause can pull the plug on the patient’s only survival mechanism. • STOP first before flipping to tachyarrhythmia algorithms (SVT, AFib w/ RVR, VT, Torsades, VF).⸻⚡ Clinical Pearls • Always ask: Stable or unstable? Unstable → Shock immediately per ACLS. • If stable → STOP. Consider secondary compensations before rhythm drugs. • POCUS is your left-hand tool—look for low EF before you dare to push AV nodal blockers. • Gradual vs sudden onset helps distinguish sick-tachy (gradual, compensatory) from tachy-sick (primary arrhythmia, often sudden). • Repetition is your friend—STOP, STOP, STOP until it becomes second nature.⸻🎧 In this episode, you’ll learn how to build a jetpack framework for HR 150 that keeps you calm under pressure, helps you avoid rookie mistakes, and makes sure you never miss the underlying killer hiding beneath “just a fast heart rate.”STOP first. Then treat.

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