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Lesson

Diltiazem in AF with RVR

12 min Meds & Pharma Skip to quiz

Objective: Give diltiazem only to the stable irregular narrow-complex patient your protocol names, watch the BP, and never use it on an irregular wide-complex rhythm.

Why This Is Hard

The monitor says AF at 160, so diltiazem comes out before anyone asked about perfusion or QRS width. AHA 2025 ALS and the 2023 AF guideline: unstable gets electricity. Irregular wide is possible pre-excited AF — AV-nodal blockers are contraindicated. Hypotension after diltiazem is the usual self-inflicted wound. Protocol owns the dose; your job is the indication.

On this truck
  • Unstable (shock, severe ischemic pain, AMS, acute heart failure from the rate): synchronized cardioversion, not a calcium-channel blocker.
  • QRS wide and irregular: see the WPW lesson. No diltiazem, no adenosine, no beta-blocker.
  • If you give it: BP before and after, slow IV as labeled, calcium on your mental map if they tank (protocol-dependent rescue).

Street Sequence

  1. Pulse, perfusion, 12-lead if it will not delay a crashing patient.
  2. Narrow vs wide. Regular vs irregular. Stable vs unstable.
  3. Unstable → cardioversion. Wide irregular → no AV-nodal blocker. Stable narrow irregular → diltiazem if protocol and BP allow.
  4. Reassess rate and BP. If they crash, support perfusion and tell the ED what you gave.

Field Rules (Education)

  • Indication is narrow, irregular, stable. That is AF/AFL with RVR in ACLS language — not SVT, not VT, not WPW.
  • Dose is protocol. Typical teaching is a slow IV bolus with a BP check, sometimes a drip. Do not chase a number into single-digit MAP.
  • Hypotension: you bought it. Fluids if they can take them, pressors/calcium per protocol, and a honest handoff.
  • Beta-blockers are an alternative in some systems. Do not stack diltiazem and a beta-blocker into a dead pump.
Say out loud
  • Narrow, irregular, stable — diltiazem is on the table
  • Unstable: cardioversion not diltiazem
  • Wide irregular: no AV-nodal blocker
  • BP before and after

Field Pitfalls

  • Diltiazem into an irregular wide tachycardia “because the monitor said AF.”
  • Pushing it into a BP of 78 because the rate was ugly.
  • Stacking a beta-blocker on top ten minutes later.

Practice

60-second drill

Three strips: (1) irregular narrow 170, BP 138, talking; (2) irregular wide 220, BP 80; (3) irregular narrow 160, BP 72, wet lungs. Drug or electricity for each?

Related: Pre-Excited AF (WPW): Do Not Block the Node, Synchronized Cardioversion.

Sources & Further Study

Named guidelines for further study. They are not clinical orders and do not replace your protocol or medical direction.

Education only. Apply learning within your protocols and medical direction. This is not clinical care guidance.

Check Your Understanding

Street decisions from this lesson only. After you check, the key is highlighted. Education practice — not a certification exam.

1. Diltiazem is for:
2. Unstable AF with RVR:
3. Irregular wide-complex tachycardia:
4. The usual self-inflicted complication of field diltiazem is:
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