Department of Anesthesiology Division of Perioperative Echocardiography · 2017. 5. 5. ·...

Department of Anesthesiology

Division of Perioperative

Echocardiography

Nitroglycerin for assisting

difficult delivery at C-section

Candice Morrissey, MD, MSPHCardiac Anesthesiology and

Complex Cardiac Disease in Parturients

University of Utah

Echocardiography

Overview - Nitroglycerin

• Nitroglycerin general uses

• Mechanism of action

• Evidence

• Caveats

Echocardiography

Mechanism of Action

T. Mu ̈nzel et al. / Vascular Pharmacology 63 (2014) 105–113

Echocardiography

Nitroglycerin and platelets

Drug Design, Development and Therapy 2015:9

Echocardiography

Nitroglycerin cardiovascular use

Echocardiography

Nitroglycerin and LVEDP

Coronary Perfusion Pressure = Diastolic BP - LV End Diastolic Pressure

Echocardiography

Smooth muscle of the uterus

Echocardiography

Nitroglycerin as a uterine relaxant

• Uses as a uterine relaxant:

• Cervical ripening

• Acute Tocolysis

• External version

• Extraction at Cesarean section

• Primary dysmenorrhea

• Development of preeclampsia

Echocardiography

Competing interests?

Echocardiography

Competing interests?

Echocardiography

Common understanding

Echocardiography

IV Nitroglycerin

• General benefits:

• Onset of action (clinically evident in 30 seconds)

• Rapid termination (T1/2 2-2.5 min)

• ***Relative hemodynamic stability***

• General side effects:

• Dose-dependent HA/flushing and dizziness

Echocardiography

Nitroglycerin

• Relative Contraindications:

• Hypertrophic cardiomyopathy

• Left ventricular outflow obstructions

• Contraindication:

• Allergy to organic nitrates

• Increased Intracranial Pressure

• Pericardial constriction/restriction/tamponade

Echocardiography

Nitroglycerin use in delivery of infant

• Benefits in the setting of difficult delivery

• Uterine relaxation facilitating delivery with decreased

birth trauma

• Concerns

• Profound hypotension in the setting of reduced preload

• Uterine atony resulting in PPH?

• Platelet dysfunction resulting in increased bleeding?

• Fetal effects?

Echocardiography

Axemo P, Fu X, Lindberg B, et al, "Intravenous Nitroglycerin for Rapid Uterine Relaxation," Acta Obstet Gynecol Scand, 1998,

Echocardiography

Nitroglycerin - Cochrane Review

Echocardiography

• 2006

• Nitroglycerin may be used when immediate relaxation

of the uterus is needed.

“We’ve got to get the baby out!”-Porth

Echocardiography

Dose matters

• Recommended dose IV nitroglycerin

• 100-200 micrograms

• redose in 2 minutes

• Reverse tocolytics with oxytocin

• Hypovolemia and hypotension should be corrected

prior to administration

Chandraharan E and Arulkumaran S, "Acute Tocolysis," Curr Opin

Obstet Gynecol, 2005, 17(2):151-6. [PubMed 15758607]

Echocardiography

Thank You

Department of Anesthesiology Division of Perioperative Echocardiography · 2017. 5. 5. ·...

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