Contrast induced nephropathy primary prevention

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Mohamed Moubarak, M.D. [2]

Overview

Many strategies have aimed at preventing CIN. Non-therapeutic measures include smaller doses of contrast and use of low-osmolar or iso-osmolar agents.

Prevention

Non-Pharmacologic Approaches

Dose of contrast media

The 2012 clinical practice guidelines by KDIGO recommended using the smallest possible dose in every procedure requiring IV contrast especially in patients at high risk for developing CIN.[1] Nyman et al suggested an alternative approach, using the ratio of dose of iodine (in grams) to estimated glomerular filtration rate (eGFR). The team found the ratio to be predictive of the risk of CIN. A ratio I(g)/eGFR < 1 was shown to be relatively safe even in patients with many possible risk factors. The estimated risk decreased eightfold when the ratio dropped below 1.[2]

Route of Administration

Most studies illustrating the pathophysiology, treatment and prophylaxis of CIN focus on intra-arterial (IA) injection of contrast media considering it has been associated with the highest cases of CIN. A number of trials have also shown that intra-venous (IV) contrast has a significantly lower risk of CIN than IA contrast.[3][4] In fact, a review by Rao and Newhouse showed that in studies with proper controls, the risk of CIN after IV contrast administration did not differ between the study groups and the control groups.[5] This further emphasizes the importance of the route of contrast administration, and points to the fact that IV contrast has not been explicitly shown to be nephrotoxic.

Osmolarity of Contrast Agent

The clinical practice guidelines from 2012 by KDIGO advocate the use of either iso-osmolar or low-osmolar iodinated contrast media, rather than high-osmolar media particularly in patients at increased risk of CIN.[1]

More recently:

Preventative Strategies in CT scan - Click to Enlarge
Preventative Strategies in Angiography - Click to Enlarge

Pharmacologic Approaches

Volume Expansion

The mechanisms by which volume expansion decrease the risk of CIN may include dilution of the contrast media, increase in renal prostaglandins, counteraction of altered renal hemodynamics, and inhibition of the renin-angiotensin system.

Clinical practice guidelines from 2012 by KDIGO recommend fluid administration should be initiated 1-2 h intravenously before and maintained for 3–6 hours after contrast exposure.[1]

More recently:

  • Sodium bicarbonate was found beneficial by a meta-analysis of patients with pre-existing renal insufficiency.[7] The 2012 KDIGO guidelines did not recommend against the use of bicarbonate stating possible benefit but inconsistent data.
  • Among patients undergoing cardiac catheterization, dosing the amount of fluid based on the left ventricular end-diastolic pressure is beneficial.[8]

N-acetylcysteine

N-acetylcyteine (NAC) is a mycolytic agent and an antioxidant used in the treatment of acetaminophen overdose.

Clinical practice guidelines by KDIGO from 2012 recommend NAC along with isotonic crystalloids.[1]

More recently:

  • A meta-analysis suggests "High-dose statins plus hydration with or without NAC might be the preferred treatment strategy to prevent contrast-induced". [9] Consistent with the meta-analysis[9]
  • Morerandomized controlled trials found similar outcomes between normal saline (NS) alone, NS with N-acetylcysteine, NS with sodium bicarbonate.[10][11]

Two commonly used regimens are N-acetylcysteine (NAC) 600 mg orally twice daily, one day before the procedure and on the day of the procedure,[12] or a higher dose of 1200 mg orally twice daily administered in the similarly.[13].

Prophylactic Hemodialysis

Considering studies have shown association with estimated GFR and risk of CIN, and given the fact that contrast media can be effectively removed with as little as one session of hemodialysis, many studies have aimed at evaluating the benefit of pre-emptive hemodialysis in patients with underlying renal disease. Studies until recently have had very variable results with some showing lower risk of CIN,[14][15] some showing no added benefit over saline infusion or NAC,[16][17] and some even showing a worse outcome following hemodialysis.[18] Given the very conflicting evidence, the eleveated costs, and the difficult logistics, no recommendations can be made about the use of prophylactic hemodialysis for CIN prevention. The 2012 KDIGO guidelines recommend against the use of prophylactic hemodialysis stating that use can only be advocated if future studies convincingly show added benefit.[19]

Theophylline

Interest in theophylline for CIN prophylaxis stems from the association of adenosine with the pathophysiology of CIN in certain studies.[20] Theophylline is a methylxanthine previously used for the treatment of asthma that also acts as an adenosine antagonist. Data about the use of theophylline is conflicting and several meta-analysis have shown little to not benefit from the use of theophylline prophylaxis.[21][22] However, more recent studies have shown some significant decrease in the risk of CIN when theophylline was compared to other prophylactic measures notably N-acetylcysteine and bicarbonate.[23][24] Still, the use of theophylline is not advocated given the limited data and the skewed risk to benefit ratio. Theophylline has many side effects including cardiac and CNS toxicity, and a very narrow therapeutic index entailing cautious use. The 2012 KDIGO guidelines recommend against the use of theophylline for CIN prophylaxis.

Statins

Clinical practice guidelines by KDIGO from 2012 did not recommend statins.[1]

More recently:

  • A meta-analysis suggests "High-dose statins plus hydration with or without NAC might be the preferred treatment strategy to prevent contrast-induced". [9] Consistent with the meta-analysis[9]

Fenoldopam

Fenoldopam is a selective dopamine A1 receptor agonist used as an anti-hypertensive with the added effect of increased renal medullary blood flow. Although small retrospective reviews showed benefit from using fenoldopam with isotonic saline, two randomized control trials showed no added benefit from using fenoldopam with saline compared to saline alone.[25][26] The 2012 KDIGO AKI guidelines recommend against using fenoldopam as a CIN prophylactic agent.[19]

Other interventions

Other pharmacological agents, such as furosemide, mannitol, dopamine, and atrial natriuretic peptide have been tried, but have either not had beneficial effects, or had detrimental effects.[27][28]

2012 KDIGO Clinical Practice Guideline for Acute Kidney Injury (DO NOT EDIT)[29]

Nonpharmacological prevention strategies of CI-AKI

Level 1
"1. We recommend using either iso-osmolar or low-osmolar iodinated contrast media, rather than high-osmolar iodinated contrast media in patients at increased risk of CI-AKI. (Level of Evidence: 1B)"
Not Graded
"1. Use the lowest possible dose of contrast medium in patients at risk for CI-AKI. (Level of Evidence: Not Graded)"
Level 2
"1. We suggest not using prophylactic intermittent hemodialysis (IHD) or hemofiltration (HF) for contrast-media removal in patients at increased risk for CI-AKI. (Level of Evidence: 2C)"

Pharmacological prevention strategies of CI-AKI

Level 1
"1. We recommend i.v. volume expansion with either isotonic sodium chloride or sodium bicarbonate solutions, rather than no i.v. volume expansion, in patients at increased risk for CI-AKI. (Level of Evidence: 1A)"
"2. We recommend not using oral fluids alone in patients at increased risk of CI-AKI. (Level of Evidence: 1C)"
"3. We recommend not using fenoldopam to prevent CI-AKI. (Level of Evidence: 1B)"
Level 2
"1. We suggest using oral NAC, together with i.v. iso-tonic crystalloids, in patients at increased risk of CI-AKI. (Level of Evidence: 2D)"
"2. We suggest not using theophylline to prevent CI-AKI. (Level of Evidence: 2C)"

2011 ACCF/AHA/SCAI Guideline Recommendations: Pre-procedural Considerations (DO NOT EDIT)[30]

Contrast-Induced Acute Kidney Injury

Class I
"1. Patients should be assessed for risk of contrast-induced acute kidney injury before PCI.[31][32] (Level of Evidence: C)"
"2. Patients undergoing cardiac catheterization with contrast media should receive adequate preparatory hydration.[33][34][27][35] (Level of Evidence: B)"
"3. In patients with chronic kidney disease (CKD) (creatinine clearance <60 mL/min), the volume of contrast media should be minimized.[36][37][38] (Level of Evidence: B)"
Class III: Harm
"'1. Administration of N-acetyl-L-cysteine is not useful for the prevention of contrast-induced acute kidney injury.[39][40][41][42][43] (Level of Evidence: B)"

References

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