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Acid-base Management in Cardiopulmonary Bypass

SM Anestesi Bedah Kardiovaskular, RS Jantung dan Pembuluh Darah Harapan Kita, Jakarta, Indonesia

Received: 23 Aug 2020; Published: 1 Jul 2021.
Open Access Copyright 2021 JAI (Jurnal Anestesiologi Indonesia)

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Abstract

Cardiopulmonary bypass (CPB) merupakan alat penunjang fungsi sirkulasi dan pernapasan pasien yang biasa digunakan ketika menjalani pembedahan jantung atau pembuluh darah besar. Selama prosedur CPB, kondisi hipotermia dipertahankan untuk menurunkan kebutuhan oksigen dan laju metabolisme. Kondisi hipotermia akan mempengaruhi keseimbangan asam-basa pada tubuh. Manajemen asam-basa selama prosedur CPB dicapai dengan menggunakan metode a-stat atau pH-stat. Pada metode a-stat, manajemen asam-basa dilakukan dengan menjaga pHa 7.4 dan PaCO2 40 mmHg pada suhu 37oC tanpa penambahan CO2 oksigen untuk menjaga total CO2 tetap konstan. Sedangkan, pada metode pH-stat, diberikan CO2 oksigen untuk menjaga PaCO2 40 mmHg dan pHa 7.4 secara in vivo. Masih banyak perdebatan terkait waktu penerapan masing-masing metode. Pada level mikrosirkulasi, manajemen a-stat terbukti memberikan keuntungan pada otak dan mengurangi insidensi postoperative cerebral dysfunction. Sedangkan, metode pH-stat dilaporkan meningkatkan risiko emboli otak, sehingga tidak disarankan untuk pasien yang memiliki risiko tinggi gangguan aliran darah otak. Namun, terdapat pula laporan yang menyatakan pH-stat bermanfaat pada operasi bedah jantung anak. Berdasarkan hal itu, usia pasien dapat menentukan waktu penggunaan metode a-stat dan pH-stat. Satu indikasi primer penggunaan pH-stat adalah selama proses pendinginan saat deep hypothermic circulatory arrest (DHCA), sedangkan metode a-stat lebih baik digunakan selama selective cerebral perfusion (SCP) dan rewarming.

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Keywords: -stat; manajemen asam basa; cardiopulmonary bypass; hipotermia; pH-stat

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