LAPORAN RESMI PRAKTIKUM FARMAKOLOGI PERCOBAAN X TERAPI ANTIDOT METODE KHAS NATRIUM NITRIT DAN NATRIUM TIOSULFAT
Disusun oleh : 1.
Farida Yunisa L.
(1041211065) (1041211065)
2.
Finia Deviacita
(1041211068) (1041211068)
3.
Hananti Febriani P. (1041211071) (1041211071)
4.
Indah Hari Utari
(1041211080) (1041211080)
PROGRAM STUDI S1 FARMASI
SEKOLAH TINGGI ILMU FARMASI “YAYASAN PHARMASI” SEMARANG 2014
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PERCOBAAN X TERAPI ANTIDOT METODE KHAS NATRIUM NITRIT DAN NATRIUM TIOSULFAT
I.
TUJUAN
Mampu memahami tujuan, sasaran dan strategi terapi antidot, berdasarkan contoh kemampuan natrium nitrit dan natrium tiosulfat menawarkan racun sianida.
II. DASAR TEORI
Toksikologi adalah ilmu yang pempelajari tentang efek toksik atau efek toksik atau efek berbahaya dari suatu zat kimia terhadap jaringan biologi.Zat kimia yang potensial toksik sangat banyak berada dilingkungan manusia, menyebabkan menyebabkan pembahasan toksikologi menjadi sangat luas.Ada beberapa bidang toksikologi yang berkaitan dengan zat kimia penyebab toksik. Toksikologi lingkungan (polusi udara dan air), toksikologi ekonomi (zat tambahan makanan, pestisida), toksikologi mediolegal (foresik, regulasi zat tambahan makanan, zat berbahaya), toksikologi biomedikal (obat dan zat diagnostik) dan toksikologi laboratorium (analisa kimiawi zat toksik). (Priyanto,2007: 94) Banyaknya zat kimia yang dapat menimbulkan efek toksik, namun tidak tersedia antidotumnya, sehingga kalau terjadi keracunan olehnya hanya dilakukan tindakan simtomatik untuk meminimalkan resiko.Secara umum, terapi antidotum didefinisikan sebagai tatacara yang ditunjukkan untuk membatasi intensitas efek toksik zat kimia atau menyembuhkannya
sehingga
bermanfaat
dalam
mencegah
timbulnya
bahaya
selanjutnya. Efek toksik suatu zat kimia dapat terjadi jika kadar zat toksik tesebut melampaui kadar toksik minimal ( KTM )nya dalam sel sasaran. Untuk mencapai KTM nya, untuk zat yang masuk melalui oral atau topikal harus melalui beberapa tahap.Tahap tersebut adalah absorbsi masuk kesirkulasi sistemik lalu mengalami distribusi menuju tempat kerjanya. Kedua proses diatas (absorpsi dan distribusi) menyebabkan peningkatannya kadar obat dalam sel s el sasaran. Proses Prose s berikutnya yang dapat mengurangi kadar obat dalam selsasaran adalah metabolisme dan ekskresi atau sering disebut eliminasi. Sehingga efek toksik suatu zat kimia kimia sangat dipengaruhi proses absorbsi,
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Dengan demikian untuk mengurangi jumlah zat kimia dalam sel sasarannya dapat dilakuakan dengan cara: menghambat absorbsi dan distribusi serta mempercepat metabolisme dan ekskresi (eliminasi), meningkatkan nilai ambang toksik (KTM, kadar toksik minimal ) juga merupakan cara untuk mencegah efek toksik. Kesemua hal di atas sering merupakan strategi terapi antidotum. (Priyanto, 2007: 95) 1. Terapi Non spesifik Terapi non spesifik adalah suatu terapikeracunan yang bersifat hampir sama pada semua kasus keracunan, melalui cara – cara cara seperti memacu muntah, bilas lambung dan membersihkan zat absorben. Cara lain adalah mempercepat eliminasi dengan pengasaman dan pembasaan urin ataun hemodialisis. hemodialisis. a. Menghambat absorbsi zat racun. Menghambat absorbsi zat racun dapat dilaksanakan dengan beberapa cara antara lain dengan membersihkan atau mencuci kulit yang terkontaminasi zat toksik, mengeluarkan racun dalam lambung, mencegah absorbsi, dan memberikan pencahar. Mencuci kulit dilakukan dengan air mengalir dan jika zat mengenai pakaian, pakaiannya ditanggalkan.Zat dita nggalkan.Zat toksik yang sudah masuk kedalam kedala m lambung dapat dilakukan dengan pemberian norit (arang aktif), menentukan atau memberi pencahar atau bilas lambung. 1) Pemberian arang aktif (norit) Arang aktif diberikan pada kasus keracunan karena dapat mengabsorbsi zat racun atau toksin dalam saluran pencernaan. Lebih dini norit diberikan akan lebih efektif hasilnya. Norit masih efektif hingga 2 jam dari racun tertelan dan lebih lama lagi pada keracunan obat sediaan lepas lambat atau keracunan obat – obat yang bersifat kolinergik. Karbon Karbon aktif relatif aman dan dosisnya sangat tergantung dari jumlah zat toksik yang tertelan. Dosis minimalnya adalah 30 gram.Dosis pada orang dewasa adalah 50 g dapat diulang setiap 4-6 jam.Pemberian dosis berulang juga bermanfaat mempercepat eliminasi zat toksik yang sudah terabsorbsi. Karbon aktif dapat menyerap zat-zat seperti salisilat, acetaminophen, karbamazepin, dapson, teofilin, quinine dan obat-obat antidepresan.Pemberian
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2) Mengeluarkan racun dari lambung. Pengeluaran racun dari lambung harus mempertimbangkan zat yang tertelan, tingkat keracunan dan berapa lama zat racun tertelan.Pengosongan lambung tidak berguna jika resiko dari keracunan kecil atau pasien sudah datang terlambat.Pengosongan dengan bilas lambung diragukan kegunaannya bila dilakukan lebih dari 1-2 jam setelah racun tertelan.Bahaya dari bilas lambung adalah teraspirasinya isi lambung.Karena itu tidak boleh dilakukan pada pasien yang mengantuk atau koma kecuali jika reflek batuk sangat baik atau saluran nafas dapat dilindungi dengan pipa endotrakea.Pipa lambung tidak boleh dimasukkan pada keracunan zat korosif. korosif. Produk petroleum lebih berbahaya di dalam paru-paru dibandingkan di lambung, karena itu pencucian lambung tidak dianjurkan karena ada resiko terhirup.Dengan berbagai pertimbangan, bilas lambung umumnya tidak praktis dan jarang diperlukan, kecuali di rumah sakit. Pemuntahan isi perut dengan pemberian ipecacuanha telah dipakai baik pada orang dewasa atau anak-anak, tetapi sangat terbatas kegunaannya. Tidak terbukti bahwa ipecacuanha mengurangi penyerapan secara bermakna ( walaupun digunakan 1-2 jam ) dan efek sampingnya dapat menyulitkan penegakan
diagnostik
terutama
pada
keracunan
zat
besi.
Pemberian
ipecacuanha hanya boleh dipertimnbangkan bila pasien sadar sepenuhnya, atau bila zat racun yang tertelan tidak korosif dan produk petroleum atau tidak dijerap dengan arang aktif. 3) Pemberian Katerik Pencahar digunakan untuk mempercepat pengeluaran zat racun dari saluran gastrointestinal (GI) terutama untuk racun yang sudah mencapai usus halus.Pemberian sorbitol direkomendasikam pada penderita yang tidak ada gangguan jantung.Magnesium sulfat dapat digunakan pada penderita yang tidak ada gangguan ginjal. b. Mempercepat eliminasi Kecepatan eliminasi akan mempengaruhi jumlah obat yang berada dalam sel
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diuresis paksa. Pengamasan urin (menurunkan pH urin) dengan memberikan zat seperti amonnium klorida atau vitamin C akan mengurangi reabsorbsi zat atau obat yang bersifat basa lemah seperti amfetamin. Sebaliknya pembasaan urin melslui pemberian natrium bikarbonat akan mengurangi reabsor bsi pada obat yang bersifat asam lemah seprti aspirin dan fenobarbital. Pengurangan reabsorbsi tubulus terjadi karena pengasaman/pembasaan urin tersebut di atas akan meningkatkan ionisasi di tubulus sehingga akn mengurangi reabsorbsi. (Priyanto, 2007: 96-97) 2. Terapi Spesifik Terapi antidot spesifik adalah suatu terapi antidotum yang hanya efektif untuk zat-zat tertentu. Cukup banyak antidotum spesifik telah digunakn dalam klinik. Untuk memudahkan mempelajarinya, antidotum yang spesifik dikelompokan menjadi: antidotum yang bekerja secara kimiawi, bekerja secara farmakologi dan yang bekerja secara fungsional. a. Asam Sianida Asam sianida merupakan senyawa racun yang dapat mengganggu kesehatan serta mengurangi bioavailabilitas nutrien di dalam tubuh. Sianida sering dijumpai di dalam kacang almond, daun salam, cherry, ubi. Di dalam koro atau tanaman dari keluarga kacang-kacangan dan ketela pohon.Sianida merupakan senyawa kimia yang toksik dan memiliki beragam kegunaan, termasuk sintesis senyawa kimia, analisis laboratorium, dan pembuatan logam.Nitril alifatik (acrylonitrile dan propionitrile digunakan dalam produksi plastic yang kemudian dimetabolisme menjadi sianida.Obat vasodilator seperti nitroprusida melepaskan sianida pada saat terkena cahaya ataupun pada saat metabolisme.Sianida yang berasal dari alam (amigdalin dan glikosida sinogenik lainnya) dapat ditemukan dalam biji aprikot, singkong, dan banyak tanaman lainnya, beberapa diantaranya dapat berguna, tergantung pada keperluan ethnobotanikal. Acetonitrile, sebuah komponen pada perekat besi, dapat menyebabkan kematian pada anak-anak. Sianida merupakan racun yang bekerja cepat, berbentuk gas tak berbau dan tak berwarna, yaitu hidrogen sianida (HCN) atau sianogen
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dengan mencampur asam dengan garam sianida dan sering digunakan dalam pembakaran plastik, wool, dan produk natural dan sintetik lainnya.Keracunan hidrogen sianida dapat menyebabkan kematian, dan pemaparan secara sengaja dari sianida (termasuk garam sianida) dapat menjadi alat untuk melakukan pembunuhan ataupun bunuh diri (Olson, 2007). Akibat racun sianida tergantung pada jumlah paparan dan cara masuk tubuh, lewat pernapasan atau pencernaan. Racun ini menghambat sel tubuh mendapatkan oksigen sehingga yang paling terpengaruh adalah jantung dan otak Paparan dalam jumlah kecil mengakibatkan napas cepat, gelisah, pusing, lemah, sakit kepala, mual dan muntah serta detak jantung meningkat. Paparan dalam jumlah besar menyebabkan kejang, tekanan darah rendah, detak jantung melambat, kehilangan kesadaran, gangguan paru serta gagal napas hingga korban meninggal (Utama, 2006) b. Natrium Tiosulfat Berupa hablur besar, tidak berwarna, atau serbuk hablur kasar.Mengkilap dalam udara lembab dan mekar dalam udara kering pada suhu lebih dari 33°C.Larutannya netral atau basa lemah terhadap lakmus.Sangat mudah larut dalam air dan tidak larut dalam etanol (Depkes, 1995) Sodium tiosulfat merupakan donor sulfur yang mengkonversi sianida menjadi bentuk yang lebih nontoksik, tiosianat, dengan enzyme sulfurtransferase, yaitu rhodanase.Tidak seperti nitrit, tiosianat merupakan senyawa nontoksik, dan dapat diberikan secara empiris pada keracunan sianida.Penelitian dengan hewan uji menunjukkan kemampuan sebagai antidot yang lebih baik bila dikombinasikan dengan hidroksokobalamin (Olson, 2007). Rute utama detoksifikasi sianida dalam tubuh adalah mengubahnya menjadii tiosianat oleh rhodanase, walaupun sulfurtransferase yang lain, seperti betamerkaptopiruvat sulfurtransferase, dapat juga digunakan.Reaksi ini memerlukan sumber sulfan sulfur, tetapi penyedia substansi ini tebatas. Keracunan sianida merupakan proses mitokondrial mitokondrial dan penyaluran intravena
sulfur hanya hanya akan
masuk ka mitokondria secara perlahan. Natrium tiosulfat mungkin muncul sendiri
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diagnosis intoksikasi sianida tidak terjadi, misalnya pada kasus penghirupan asap rokok. Natrium tiosulfat diasumsikan secara intrinsic nontoksik tetapi produk detoksifikasi yang dibentuk dari sianida, tiosianat dapat menyebabkan toksisitas pada pasien dengan kerusakan ginjal.Pemberian natrium tiosulfat 12.5 g i.v. biasanya diberikan secara empirik jika diagnosis tidak jelas (Meredith, 1993) Natrium tiosulfat merupakan komponen kedua dari antidot sianida.Antidot ini diberikan sebanyak 50 ml dalam 25 % larutan.Tidak ada efek samping yang ditimbulkan oleh tiosulfat, namun tiosianat memberikan efek samping seperti gagal ginjal, nyeri perut, mual, kemerahan dan disfungsi pada SSP. Dosis untuk anak-anak didasarkan pada berat badan (Meredith, 1993) 1) Indikasi Dapat diberikan sendiri ataupun dikombinasikan dengan nitrit atau hidroksokobalin pada pasien keracunan sianida akut. Perawatan secara empiris pada keracunan sianida berhubungan berhubungan dengan inhalasi. Profilaksis selama infus nitroprusida. Ekstravasasi dari mechlorethamin. Ingesti garam bromat 2) Kontraindikasi Tidak diketahui kontraindikasinya 3) Efek samping Infus intravena dapat menyebabkan menyebabkan rasa terbakar, kejang otot dan gerakan tiba-tiba, dan mual dan muntah. Penggunaan pada wanita hamil.
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Untuk profilaksis selama infuse nitroprusida. Tambahan 10 mg tiosulfat pada tiap milligram nitroprusida pada larutan
intravena
dikatan
dapat
menjadi
efektif,
namun
data
kompatibilitasnya tidak tersedia (Olson, 2007)
3. Natrium Nitrit Nitrit menyebabkan methemoglobin dengan sianida membentuk substansi nontoksik sianmethemoglobin.Methemoglobin tidak mempunyai afinitas lebih tinggi pada sianida daripada sitokrom oksidase, tetapi lebih potensial menyebabkan methemoglobin daripada sitokrom oksidase.Efek samping dari penggunaan nitrit meliputi pembentukan formasi methemoglobin, vasodilatasi, hipotensi, dan takikardi. Mencegah pembentukkan formasi yang cepat, monitoring tekanan darah, dan pemberian dosis yang tepat akan mengurangi terjadinya efek samping. Ketika dilakukan terapi dengan nitrit, lihat konsentrasi hemoglobin Tetapi jangan menunda terapi ketika menunggu hasil pengukuran kadar hemoglobin (Meredith, 1993) Sodium nitrit injeksi dan amil nitrit dalam bentuk ampul untuk inhalasi merupakan komponen dari antidot sianida. Kegunaan nitrit sebagai antidot sianida bekerja dalam dua cara, yaitu : nitrit mengoksidasi hemoglobin, yang kemudian akan mengikat sianida bebas, dan cara yang kedua yaitu meningkatkan detoksifikasi sianida endothelial dengan menghasilkan vasodilasi. Inhalasi dari satu ampul amil nitrit menghasilkan tingkat methemoglobin sekitar 5%.Pemberian dosis tunggal nitrit secara intravena dapat menghasilkan tingkat methemoglobin sekitar 20-30% (Olson, 2007)
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Pemberian secara intravena dapat menyebabkan hipotensi. Methemoglobinemia berlebihan dan fatal dapat terjadi. Penggunaan pada kehamilan. 3) Interaksi obat
Hipotensi dapat menjadi parah apabila nitrit diberikan bersamaan dengan alkohol atau vasodilator atau agen antihipertensi lainnya.
Metilen biru sebaiknya tidak diberikan pada pasien yang keracunan sianida karena dapat membalikkan induksi methemoglobinemia oleh nitrit dan secara teori menghasilkan pelepasan ion bebas sianida.
Ikatan dari methemoglobin pada sianida (sianomethemoglobin) dapat menurunkan tingkat methemoglobin bebas (Olson, 2007)
4) Dosis dan metode pemberian
Amil nitrit dalam bentuk ampul.
Gunakan 1 atau 2 ampul pada kain kasa, pakaian, atau spons dan letakkan di bawah hidung penderita, yang sebaiknya dihirup dalam-dalam selama 30 detik.
Diamkan 30 detik, kemudian ulangi lagi (Olson, ( Olson, 2007)
Sodium nitrit parenteral.
5) Dewasa. Berikan 300 mg sodium nitrit (10 mL dari 3% larutan) IV selama 3-5 menit (Olson, 2007) 6) Anak-anak. Berikan 0.15-0.33 mL/kg sampai batas maksimum sebesar 10 mL.Dosis
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III. ALAT DAN BAHAN
1. Alat a. Spuit 1 ml b. Jarum injeksi c. Stopwatch d. Bekerglass e. Labu takar 10,0 ml 2. Bahan a. Larutan Natrium Nitrit 20 mg/kgBB b. Larutan Natrium Tiosulfat 1125mg/kgBB c. Larutan Kalium Sianida 15 mg/kgBB 3. Hewan Uji a. Mencit jantan galur Wistar
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IV. SKEMA KERJA
Mencit jantan galur Wistar, berat seragam (20-30 g), umur 40-60 hari, dikelompokkan dalam 7 kelompok sama banyak @ 3 mencit
Klp I Disuntik s.c lar. Sianida 0,5% 15 mg/kg BB di catat gejala yang timbul
Klp IIDisuntik i.p lar. Na.Nitrit 1% 20 mg/kgBB di catat gejala yang timbul
Klp III Disuntik s.c lar. sianida 0,5%15 mg/kgBB saat terjadi sianosis di suntik i.p Na.Nitrit 20 mg/kgBB di catat gejala yang timbul
Klp IV Diberi perlakuan sama seperti klp III saat terjadi kejang disuntik lar. Na.Nitrit di catat gejala yang timbul
Klp V Disuntik i.p lar. Na.Tiosulfa t 25% 1125 mg/KgBB dicatat gejala yang timbul
Klp VI Disuntik lar. Na.Tiosulfa t seperti klp V di catat gejala yang timbul
Dibuat tabel purata :waktu timbulnya gejala sianosis, kejang, gagal nafas, dan kematian setelah perlakuan tiap kelom ok
Klp VII Diberi perlakuan sama seperti klp VI saat terjadi kejang disuntik lar. Na.Tiosulfat catat gejala yang timbul
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V. DATA PENGAMATAN Kelompok Perlakuan KCN
1
Perlakuan
-
10.41 2
Kejang
Antidot
10.22 10.30
Sianosis
Hilang
Mati
kesadaran
10.24
10.26
10.27
10.28
10.32
10.31
10.34
10.35
10.43
10.44
10.44
10.45
-
-
-
-
10.36
10.38
10.21 -
10.32 10.40
3
4
10.35
10.37
10.36
10.42
10.43
10.42
10.45
10.46
10.45
-
-
10.32
10.38
10.34
10.36
11.03
10.57
11.01
10.59
11.00
10.58
11.02
11.00
11.01
-
-
-
-
5
-
-
10.29 -
10.26 10.30
-
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VI. PERHITUNGAN
1. Perhitungan ANAVA a. Pemberian obat saat sianosis Keterangan Pada KCN
Pada NaNO2
Pada Na2S2O3
Sianosis
Kejang
Hilang kesadaran waktu detik 10.27 300 10.34 240 10.44 180
Kematian
waktu 10.24 10.32 10.43
detik 120 120 120
waktu 10.26 10.31 10.44
Detik 240 60 240
10.36
60
10.36
60
10.38
180
10.43 10.46
60 60
-
-
-
-
10.31
120
10.33
240
10.32
180
-
-
11.02 11.09
240 180
11.04 11.09
360 180
11.02 11.09
240 180
11.15
540
ANAVA saat sianosis KCN (1)
NaNO2 (2)
Na2S2O3 (3)
120
60
120
120
60
240
waktu 10.28 10.35 10.45
Tidak Mati
Detik 360 300 240 Tidak Mati
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xT
2
x
2
t
x T 2
=
N
= 158400 – = 28800
x
2
1
x
2
b
=
n
x
2
2
n
= = 21600
x
2
w
=
x
2
t
x
2
b
= 28800 – 21600 21600 = 7200
x b 2
RJKb
=
k 1
= = 10800
x
2
3
n
xT
2
N
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PASCA ANAVA (UJI SCHEFFE) -1) x Ftabel F’ = (k -1)
Kontras σ
1 vs 2
(3-1) x 5,14 = 10,28
Ns
1 vs 3
(3-1) x 5,14 = 10,28
Ns
2 vs 3
(3-1) x 5,14 = 10,28
S*
Kontras F2 hitung =
Jika F2 hitung ≥ F’ maka 2 kelompok berbeda signifikan (S*)
ANAVA saat kejang KCN
NaNO2
Na2S2O3
240
60
240
60
-
360
240
-
180
∑x = 540
∑x = 60
∑x = 780
∑x² = 118800
∑x² = 3600
∑x² = 219600
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x
2
1
x
2
b
=
n
x
2
2
n
2
= = 31542,86
x
2
w
=
x
2
t
x
2
b
= 69942,86 – 31542,86 31542,86 = 38400
x b 2
RJKb
=
k 1
= = 15771,43
x RJKw
= =
2
w
N k
x 3
n
xT
2
N
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ANAVA saat hilang kesadaran KCN
NaNO2
Na2S2O3
300
180
180
240
-
240
180
-
180
∑x = 720
∑x = 180
∑x = 600
∑x² = 180000
∑x² = 32400
∑x² = 122400
= 240 n=3
= 180 n=1
=
= 200 n=3
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= = 1885,72
x RJKw
=
2
w
N k
= = 2400
RJKb
F hitung
=
RJKw
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=
900 + 0 + 540
= 1440 = =
277200 + 0 + 291600
= 568800
xT
2
x
2
t
x T 2
=
N
= 568800 – = 50400
x
2
1
2
b
x
2
2
x
2
3
xT
2
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= = F tabel
:
3 k - 1 = 3 – 1 1 = 2
N – k k = 4 – 3 = 1
200
F hitung (3) < F tabel (200), maka tidak ada perbedaan rata-rata antar kelompok pada penggunaan antidotum Natrium nitrit maupun Natrium thiosulfat setelah efek sianosis timbul pada keadaan kematian.
b. Pemberian obat saat kejang
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= 1020 = =
43200 + 43200 + 32400
= 118800
xT
2
x
2
t
x T 2
=
N
= 118800 – = 3200
x
2
1
x
2
b
=
n
x
2
2
n
x
2
3
n
xT
2
N
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F tabel
:
N – k k = 9 – 3 = 6
k - 1 = 3 – 1 1 = 2 5,14
F hitung (1) < F tabel (5,14), maka tidak ada perbedaan rata-rata antar kelompok pada keadaan kejang sebelum penggunaan antidotum Natrium nitrit maupun Natrium thiosulfat yang diberikan ketika efek
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x
2
w
=
x
2
t
x
= 32000 – 5600 5600 = 26400
x b 2
RJKb
=
k 1
2
b
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= 240 n=3
= 620 n =1
= 260 n =3
= =
720 + 1860 + 780
= 3360
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RJKb
F hitung
=
RJKw
= = 264.57
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∑x² = 277200 = 300 n=3
∑x² = =n=-
∑x² = 1400400 = 620 n=3
= =
900 + 0 + 1860
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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Trusted by over 1 million members
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